Faculty Profiles - MIYAMOTO Shinichi

Misc - MIYAMOTO Shinichi

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Periodic Notification of NAV using Leaky Coaxial Cable for Establishment of Virtual Private Channel in WLAN System

淵辺悠太, 宮本伸一

電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 ( 電子情報通信学会 ) 117 ( 178 ) 7 - 12 2017.08

A Study on application of One Time Pad to enhance information secrecy in wireless distributed transmission

鄒京博, 山中仁昭, 大野修一, 宮本伸一, 三瓶政一

電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 ( 電子情報通信学会 ) 116 ( 395 ) 81 - 86 2017.01

Access Point Allocation Scheme for Milli-meter Wave Wireless Local Area Network based on User Trajectory Prediction

棟田淳哉, 宮本伸一, 三瓶政一

電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 ( 電子情報通信学会 ) 115 ( 472 ) 333 - 338 2016.03

B-5-126 A Study on Access Point Allocation Scheme for Milli-meter Wave Wireless Local Area Network based on Estimated Trajectory of Users

MUNETA Junya, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2016 ( 1 ) 519 - 519 2016.03

B-5-161 A Study on Secure Transmission Capacity of Distributed Transmission in Wireless Space

Zou Jingbo, Yamanaka Masaaki, Ohno Shuichi, Miyamoto Shinichi, Sampei Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2016 ( 1 ) 554 - 554 2016.03

B-5-122 A Study on Interference Elimination Strategy for Bluetooth LE Communication using Medium Reservation Scheme in Wireless LAN Systems

YAMABE Kazuaki, SAMPEI Seiichi, MIYAMOTO Shinichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2016 ( 1 ) 515 - 515 2016.03

B-5-167 A Study on Transmission Power of NAV Frames from Spatially Distributed Stations for Establishment of Virtual Private Channel in WLAN System

Miyamoto Shinichi, OMAE Atsushi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2016 ( 1 ) 560 - 560 2016.03

B-5-87 Dual-band MAC Protocol for AP Coordinated Millimeter-wave WLAN Using Microwave Control Channel

KAWAHARA Masashi, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the Society Conference of IEICE ( The Institute of Electronics, Information and Communication Engineers ) 2015 ( 1 ) 349 - 349 2015.08

B-5-146 A Study on Periodic Notification of NAV from Spatially Distributed Stations for Establislment of Virtual Private Channel in WLAN System

OMAE Atsushi, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2015 ( 1 ) 501 - 501 2015.02

B-5-153 A Study on Beamforming Training Interval for Supporting Low-Speed Mobile Station in Access Point Coordinated Millimeter-Wave WLAN Systems

MIYAZAKI Shinya, MIYAMOTO Shinichi, SAKAGUCHI Kei, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2015 ( 1 ) 508 - 508 2015.02

A Proposal of Inter-BSS Cooperative Radio Resource Management for Centralized WLAN Systems in Overlapping BSS Environments

ENDO Takuya, MIYAMOTO Shinichi, SAMPEI Seiichi, JIANG Wenjie

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 114 ( 372 ) 259 - 264 2014.12

To enhance a throughput and satisfy quality of service (QoS) requirement of WLAN stations in overlapping basic service set (OBSS) enviroment, this paper proposes a inter-BSS cooperative radio resource management scheme. In the proposed scheme, multiple BSSs are organized into a group and share the radio resource based on a centralized control by a master AP. Master AP collects channel state information (CSI) and traffic states information (TSI) by receiving control frames from group members to adaptively allocates orthogonal frequency division multiple access (OFDMA) sub-channels to the stations. Numerical simulation results confirm that the proposed scheme can enhance throughput by dynamic resource allocation using frequency reuse and it is also effective to guarantee QoS requirement by avoiding inter-BSS competition especially in dense BSS deployments scenario.

A Proposal of Efficient Medium Reservation Scheme for Intra-BSS Centralized WLAN Systems

MUNETA Junya, MIYAMOTO Shinichi, SAMPEI Seiichi, JIANG Wenjie

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 114 ( 372 ) 253 - 258 2014.12

To enhance the throughput of wireless local area network (WLAN) while satisfying quality of service (QoS) requirements, Intra-BSS (Intra-Basic Service Set) centralized WLAN system has been proposed. In the system, channel and traffic state information (CTSI) of all associated stations are gathered at the access point (AP) by exchanging request-to-send (RTS) / clear-to-send (CTS) frames between AP and all associated stations, and the AP dynamically allocates reserved radio resource to the active stations based on their CTSI. However, since the exchanges of RTS/CTS frames are originally used for the reservation of radio resource, these frames should be transmitted with the lowest transmission rate, and the exchanges of RTS/CTS frames between AP and all associated stations incurs signaling overhead. To counter this problem, this paper proposes an efficient resource reservation scheme for intra-BSS centralized WLAN. In the proposed scheme, the AP exchanges RTS/CTS frames with a minimum number of stations required to reserve the radio resource for their exclusive use, and the other associated stations notify their CTSI using an adaptive modulation and coding (AMC) scheme. Since the period required to reserve the radio resource and gather the CTSI of all associated stations are shortened, the signaling overhead can be reduced. Numerical simulation confirms that the proposed scheme enhances the throughput of intra-BSS centralized WLAN.

B-5-106 A Study on Efficient Medium Reservation Scheme for DCF-based OFDMA WLAN Systems

MUNETA Junya, MIYAMOTO Shinichi, SAMPEI Seiichi, JIANG Wenjie

Proceedings of the Society Conference of IEICE ( The Institute of Electronics, Information and Communication Engineers ) 2014 ( 1 ) 377 - 377 2014.09

B-5-107 A Study on Inter-BSS Radio Resource Management for DCF-based OFDMA WLAN Systems

ENDO Takuya, MIYAMOTO Shinichi, SAMPEI Seiichi, JIANG Wenjie

Proceedings of the Society Conference of IEICE ( The Institute of Electronics, Information and Communication Engineers ) 2014 ( 1 ) 378 - 378 2014.09

Cooperative Resource Control of Millimeter Wave Wireless Access via Wi-Fi Coordinator

KUSANO Hideyuki, MAHMOUD MOHAMED MAHMOUD Ehab, SAKAGUCHI Kei, MIYAMOTO Shinichi, SAMPEI Seiichi

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 113 ( 457 ) 145 - 150 2014.03

This paper proposes a new network architecture and radio resource management scheme for broadband wireless access called Wi-Fi and millimeter wave integrated heterogeneous networks, in which Wi-Fi network takes on the role of coordinator in millimeter wave radio access to suppress inter-link interference as well as to create more robust link acquisition in millimeter wave radio links. Space-time scheduling scheme is used as a radio resource management in the proposed system. Numerical analysis confirms that the proposed network architecture can enhance throughput performance of the millimeter wave radio systems.

Distributed Transmission for Secure Wireless Links by Joint Transmitter-receiver Beamforming

山中仁昭, 宮本伸一, 三瓶政一

情報処理学会論文誌 55 ( 2 ) 838 - 848 2014.02

著者らは，プライベートな無線ネットワークにおいて第三者への情報漏洩の危険性を軽減する手法として，送信ノードから受信ノードへ至る複数のパスを選択した後，秘密分散法の考えに基づき，これらのパスへ情報を分散して伝送する手法を提案してきた．本手法では，送信ノードに搭載したアレーアンテナを用いて選択したパスの方向へ個別にビーム形成を行うことにより，無線空間内に複数の伝送路を形成し，分散伝送を実現する．本稿では，受信ノードへもアレーアンテナを搭載することにより，送信ビームと協調して受信ビームを制御する送受信ビームフォーミング法を提案するとともに，こうしたビームフォーミング法に基づく分散伝送路形成法を提案する．室内環境を模擬した計算機シミュレーションにより，提案法は少ないアンテナ素子で分散性の高い伝送路を形成でき，送信情報の秘匿性を向上させることができること，また，従来法では十分な秘匿性を確保できない見通し外環境においても有効な対策となることを確認した．The authors have proposed a secure wireless link creation scheme based on a distributed transmission by providing multiple transmission routes to a destination. In this scheme, the transmitted information is divided into pieces of "shared information" by a secret sharing method and separately sent to a destination through different transmission routes with individually controlled antenna directivities. In this paper, the authors propose a joint receiver beamforming in accordance with the transmitter antenna directivity for the distributed transmission. Computer simulations clarify that the proposed scheme can enhance the degree of spatial distribution of the transmission routes. Therefore the secrecy of the transmitted information is greatly improved through the distributed transmission in wireless spaces including non-line-of sight environment from the sender.

Wide-area Centralized Radio Resource Management for DCF-based Multi-hop Wireless Networks

MIYAMOTO Shinichi, HAYATA Naoki, SAMPEI Seiichi, JIANG Wenjie

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 113 ( 360 ) 49 - 54 2013.12

To enhance the end-to-end throughput of multi-hop wireless network using unlicensed spectrum, this paper proposes a distributed coordination function (DCF)-based medium access control (MAC) protocol that enables a wide area centralized radio resource management (RRM). In the proposed protocol, after the acquisition of transmission opportunity in a traditional DCF-manner, a source station attempts to forward a medium reservation advertisement (MRA) frame to a destination station. MRA forwarding enables multiple stations constituting a multi-hop network to reserve the radio resource for their exclusive use throughout multi-hop wide area. MRA forwarding is also utilized to gather channel state information (CSI) and traffic state information (TSI) of stations at the central controller that is adaptively selected among the stations. After the MRA forwarding, based on the CSI and TSI of each station, the central controller dynamically allocates the resource blocks to the appropriate stations through the opportunistic two-dimensional scheduling using OFDMA scheme. Assigned RB information is notified to stations by relaying transmission schedule advertisement (TSA) frame and the stations transmit their DATA frames on the allocated RBs. Numerical simulation confirms that the proposed protocol enhances the end-to-end throughput of multi-hop network operating at unlicensed band.

A Secure Wireless Link Creation Based on Distributed Transmission Using a Secret Sharing Method ―Positive and Negative Effects of Narrow-beam Creation

山中仁昭, 宮本伸一, 三瓶政一

情報処理学会論文誌 54 ( 12 ) 2440 - 2450 2013.12

著者らは，プライベートな無線ネットワークにおいて第三者への情報漏洩の危険性を軽減する手法として，送信ノードから受信ノードへ至る複数のパスを選択した後，秘密分散法の考えに基づき，選択したパスへ情報を分散して伝送する手法を提案してきた．提案方式では，送信ノードにアレーアンテナを搭載することを前提に，選択したパスに対して個別に鋭い指向性（狭ビーム）を形成し，これらの指向性を時間的に切り替えることにより送受信ノード間における分散伝送を実現する．本稿では，アレーアンテナのアンテナ本数を増大させ狭ビームを形成することの効果とその弊害について明らかにする．狭ビームを形成することにより，空間的な分散性を高めて情報を伝送できるため，無線ネットワーク内における情報の秘匿性を向上できると考えられる．その一方で，狭ビームを形成することにより，送受信ノード間の伝搬利得が減少するため，送信電力が増大する等の電力面における弊害が生じることが懸念される．計算機シミュレーションに基づく評価の結果，狭ビーム形成の効果として，個々の分散情報が伝達される領域の広がりを選択したパスの周囲に制限し，より分散性の高い複数の伝送路を無線空間内に形成できること，また，そのような伝送路を使用して分散伝送することにより，伝搬途中における情報漏洩の危険性を大幅に軽減できることを明らかにした．一方，その弊害として，受信ノードへの伝送品質の向上を目的としたビーム制御法と比較すると，狭ビームの度合いに比例して送信電力の増大が必要であることを明らかにした．The authors have proposed a secure wireless link creation scheme based on a distributed transmission by providing multiple numbers of separated propagation routes to a destination. In the proposed scheme, at first, narrow-beam antenna directivities are created with an array antenna installed at the transmitter. Then, the transmitted information is divided into multiple numbers of "shared information" by a secret sharing method and sent to a destination separately through the propagation routes created with the individually controlled antenna-beam directivities. In this paper, we will clarify the positive and negative effects of the narrow-beam creation. By creating a narrow beam at the transmitter, as a positive effect, each shared piece of information is concentrated along the selected paths which will enhance the dispersibility of the distributed transmission. On the other hand, as a negative effect, the transmitted power of each shared piece of information is increased due to the deterioration of the propagation gain. Computer simulations clarify that the transmission routes are formed in a separated manner along the selected path with the narrow-beam creation, so that the secrecy of the transmitted information is greatly improved with the distributed transmission. On the other hand, the transmission power should be increased to maintain a wireless link as the antenna-beam width got narrowed with the narrow-beam creation.

A Study on Wide Area Centralized RRM for DCF-based Multi-hop Ad hoc Networks

MIYAMOTO Shinichi, HAYATA Naoki, SAMPEI Seiichi, JIANG Wenjie

Proceedings of the Society Conference of IEICE ( The Institute of Electronics, Information and Communication Engineers ) 2013 ( 1 ) 455 - 455 2013.09

A Study on Information Hiding Effect of Distributed Transmission by a Secret Sharing Method

Yamanaka Masaaki, Miyamoto Shinichi, Sampei Seiichi

Proceedings of the Society Conference of IEICE ( The Institute of Electronics, Information and Communication Engineers ) 2013 ( 1 ) 458 - 458 2013.09

A Study on Station Clustering Scheme for Intra-BSS Centralized OFDMA WLAN Systems in Overlapping Cell Environments

ENDO Takuya, MIYAMOTO Shinichi, SAMPEI Seiichi, JIANG Wenjie

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 113 ( 93 ) 141 - 146 2013.06

To enhance the throughput of OFDMA WLAN systems, this paper proposes a stations-clustering scheme in which stations in the same basic service set (BSS) are grouped into clusters. In the proposed scheme, initially, to obtain statistics required for calculating the achievable throughput when the stations are grouped into a certain clustered-pattern, the AP and all stations belong to the same cluster and transmit DATA frames for a certain period. After that, the AP calculates the achievable throughput for all clustered-pattern and chooses an optimum clustered-pattern that maximizes the achievable throughput. Then, the stations are grouped into clusters in accordance with the selected clustered-pattern, and the stations within the same cluster share the radio resource by an intra-BSS centralized OFDMA WLAN scheme. Since the proposed scheme reduces the signaling overhead due to the feedback of CSI and the number of exposed stations while obtaining higher multi-user diversity gain, throughput of OFDMA WLAN can be enhanced. Numerical simulation confirms that the proposed scheme can improve throughput performance by introduction of dynamic station clustering.

Effect of Optical Fiber Link Noise on Performance of Fiber-Radio Microcellular System

Shinichi Miyamoto, Youn-Hyun Park, Shozo Komaki, Norihiko Morinaga

Technology Reports of the Osaka University 45 ( 2228 ) 187 - 198 2013.06

B-5-201 A Study on the Number of DCF-based Access in Multi-stage DCF-based OFDMA WLAN Systems

IKESHITA Naoya, MIYAMOTO Shinichi, SAMPEI Seiichi, JIANG Wenjie

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2013 ( 1 ) 611 - 611 2013.03

B-5-185 A Study of Distributed Transmission for Secret Communication at Non-Line of Sight Environments

Yamanaka Masaaki, Miyamoto Shinichi, Sampei Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2013 ( 1 ) 595 - 595 2013.03

B-5-173 A Study on Adaptive Optics Systems in Indoor Line-of-Sight Optical Wireless MIMO Communications

MIYAZAKI Shinya, MIYAMOTO Shinichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2013 ( 1 ) 583 - 583 2013.03

B-5-200 A Study on Station Clustering Strategy for Centralized OFDMA W LAN Systems

ENDO Takuya, MIYAMOTO Shniichi, SAMPEI Seiichi, JIANG Wenjie

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2013 ( 1 ) 610 - 610 2013.03

A Study on Distributed Transmission in Wireless Space for Secret Communication Based on a Joint Transmitter-Receiver Beamforming

YAMANAKA Masaaki, MIYAMOTO Shinichi, SAMPEI Seiichi

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 112 ( 424 ) 219 - 224 2013.01

The authors have proposed a secure wireless link creation scheme based on a distributed transmission by providing multiple numbers of transmission routes to a destination In the proposed scheme, the transmitted information is divided into pieces of "shared information" by a secret sharing method and separately sent to the destination through different transmission routes with individually controlled antenna directivities. In this article, a joint receiver beamforming in accordance with the transmitter antenna directivity will be discussed A computer simulation clarifies that the degree of spatial distribution of the transmission routes is enhanced by the joint beamforming, so that it can improve the secrecy of the transmitted information with the distributed transmission in the wireless space.

A Study on Secure Wireless Links Based on Distributed Transmission Using a Secret Sharing Method -Positive and Negative Effects of Narrow Beam Creation-

Masaaki Yamanaka, Shinichi Miyamoto, Seiichi Sampei

IPSJ SIG Notes ( Information Processing Society of Japan (IPSJ) ) 2012 ( 13 ) 1 - 8 2012.09

The authors have proposed a secure wireless link creation scheme based on a distributed transmission by providing a plural number of separated propagation routes to a destination. In the proposed scheme, the transmitted information is divided into a plural number of "shared information" by a secret sharing method and sent to the destination separately through the different propagation routes with individually controlled antenna directivities. In this article the positive and negative effects of narrow beam creation at the transmitter will be discussed. By creating a narrow beam at the transmitter, as a positive effect, each shared piece of information will be transmitted to a limited area around each selected path which will improve the secrecy of the original information. On the other side, as a negative effect, the transmitted power of each shared signal will be increased. Both effects are evaluated quantitatively and discussed based on a computer simulation.

B-5-125 A Study on Multi-Stage DCF-based Channel Access for OFDMA WLANs

SHIMAMOTO Kodai, MIYAMOTO Shinichi, SAMPEI Seiichi, JIANG Wenjie

Proceedings of the Society Conference of IEICE ( The Institute of Electronics, Information and Communication Engineers ) 2012 ( 1 ) 489 - 489 2012.08

B-5-134 A Study on Multicast Transmission Technique for CSMA/CA System with OFDM-based Subcarrier Adaptive Modulation Scheme

TSUKAMOTO Yusuke, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2011 ( 1 ) 520 - 520 2011.02

B-5-159 A Study on Directional Control for Secure Wireless Communication using Spatially Separated Propagation Channels

MATOBA Hiroki, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2011 ( 1 ) 545 - 545 2011.02

A Study on Parameter Controls of Transmit Antenna Directivity for Secure Wireless Link Creation based on Secret Sharing Method

YAMANAKA Masaaki, MIYAMOTO Shinichi, SAMPEI Seiichi, MORINAGA Norihiko

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 110 ( 340 ) 221 - 226 2010.12

The authors have proposed a secure wireless communication scheme by producing shared information by secret sharing method and transmitting the information through different propagation paths from sender to receiver. In this paper the antenna directivity control method is proposed to concentrate the information-shared signal to each propagation paths, that is necessary to realize the previously proposed secure communication scheme. The authors clarified in this paper that proper parameter adjustment of the antenna directivity control is necessary to restain information leakage to unintended area from the sender in accordance with the communication environment.

B-5-127 A Study on Secure Wireless Communication Link Control Using the Secret Sharing Method

YAMANAKA Masaaki, MIYAMOTO Shinichi, SAMPEI Seiichi, MORINAGA Norihiko

Proceedings of the Society Conference of IEICE ( The Institute of Electronics, Information and Communication Engineers ) 2010 ( 1 ) 481 - 481 2010.08

A Proposal of Intensity Distribution-based Multiplexing Scheme for Downlink LOS Indoor Optical Wireless Communication System

HAYATA Naoki, MIYAMOTO Shinichi, SAMPEI Seiichi

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 110 ( 77 ) 139 - 144 2010.06

This paper proposes a novel spatial division multiplexing (SDM) scheme for line-of-sight (LOS) point-to-multipoint (P-MP) indoor optical wireless system. Point-to-point (P-P) transmission system allows the usage of a narrow optical signal and the transmitted signal is detected by a photodetector with a narrow field of view (FOV). P-MP transmission, on the other hand, inherently requires the usage of a spatially widespread optical signal, which makes difficult to enable SDM due to the interference between spatially multiplexed optical signals. In the proposed scheme, optical intensity distribution created by superimposed optical signals is transmitted from the transmitter and detected by the receiver with photodetectors array, where multiple photodetectors are disposed to observe the spatial intensity distribution of optical signals. Numerical results show that the SDM can be performed in LOS P-MP indoor optical wireless communication system.

B-5-120 A Study on Intensity Distribution-based Multiplexing Scheme for Downlink Hybrid-LOS Indoor Optical Wireless Communication System

HAYATA Naoki, MIYAMOTO Shinichi, SAMPEI Seiich

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2010 ( 1 ) 552 - 552 2010.03

B-5-167 A Study on Transmission-Time Duration Control Scheme for Subcarrier Selection-Type CSMA/CA based Multi-hop Wireless Networks

NAGANO Hiroki, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2010 ( 1 ) 599 - 599 2010.03

A Study on Wireless Access for Ambient Information Society Infrastructure : An Approach from Wireless Distributed Networking Technology

SAMPEI Seiichi, IBI Shinsuke, MIYAMOTO Shinichi, ONOYE Takao, HATANAKA Masahide

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 109 ( 441 ) 83 - 88 2010.02

This paper discusses technical challenges for wireless access technologies in the ambient information society infrastructure in which the system offers information that the person wants or controls his/her environment to be more comfortable without being noticed. Because interaction between the ambient information system and human requires quite a large number of message transfers, the wireless access is required, as a control signaling mission, to transmit messages while satisfying the required throughput and response time, regardless of the traffic and radio channel conditions. Thus, the discussion in this paper will mainly focus on the radio resource management that establishes wireless links under mutual interference existence, and link capacity control techniques from the view points of wireless distributed networking.

A Transmit Antenna Directivity Control Technique for Secure Wireless Communication in Indoor Ubiquitous Communication Environments

YAMANAKA Masaaki, SAMPEI Seiichi, MIYAMOTO Shinichi, MORINAGA Norihiko

The IEICE transactions on communications B ( The Institute of Electronics, Information and Communication Engineers ) 92 ( 9 ) 1487 - 1499 2009.09

ユビキタス通信を実現するための様々なプライベート無線通信システムが普及する中,無線通信ゆえのセキュリティの低さが指摘され,セキュアな無線通信への要求が高まっている.このような要求に対し,送信指向性を制御し,盗聴等のおそれのある方向に対しては情報が含まれる電波の放射を抑制することが有効である.本論文においては,盗聴等のおそれのある方向にあらかじめ放射電力を検出する電波センサノードを配置し,これら電波センサノードからのセンサ応答をもとに,各端末局において放射を抑制する必要のあるエリアへの放射方向を探索する,自律分散的な探索法を提案する.更に,探索した抑制の必要のある放射方向をもとに,電波放射に制約のあるエリアへの放射レベルを一定レベル以下に制御するアダプティブアレーアンテナを用いた送信指向性制御法について提案し,室内環境を対象として通信エリア外への情報の漏えいを防ぐセキュアな無線通信環境の構築法について示す.

Proposal of Secure Wireless Communication with Multi-hop Transmission using Spatially Separated Propagation Channels

HIRAI Satoshi, MIYAMOTO Shinichi, SAMPEI Seiichi

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 109 ( 105 ) 43 - 48 2009.06

Private wireless network has to establish determinate wireless network in the limited private space that user intends. Unfortunately, because of the vulnerable and unpredictable propagation of wireless signal, the transmitted signal easily spills over to the outside of the intended private space. Unnecessary and unpredictable propagation to the outside of private space will provide the opportunity of eavesdropping of transmitted information to a malicious user existing outside of the private space. This paper proposes a novel secure wireless communication scheme using spatially separated propagation channels and multi-hop transmission technique. In the proposed scheme, the node existing apart from source and destination nodes transmits sub information required to make secret information and/or extract original information from secret one and the propagation area of secret information transmitted from source node are spatially separated from that of sub information. In addition, because sub information is transmitted by way of relay nodes, the propagation area of sub information can be adaptively controlled by the transmission route. Because both the transmitted secret information and sub information are necessary to extract the original information from secret one, the exposure region where the transmitted original information is extracted can be narrowed down by proposed technique.

B-5-121 A Study on Multi-hop Transmission of Sub-Information for SecureWireless Communication using Spatially Separated Propagation Channels

HIRAI Satoshi, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2009 ( 1 ) 554 - 554 2009.03

B-21-26 A Proposal of PSK Multiplexing and Transmission Opportunity Control Techniques for Bi-directional Traffic Transmission usingWireless Network Coding

SATO Tatsuya, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2009 ( 2 ) 682 - 682 2009.03

B-5-120 A Study on Multi-route Transmission Scheme for Subcarrier Selection-Type CSMA/CA based Multi-hopWireless Networks

ONOUE Manami, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2009 ( 1 ) 553 - 553 2009.03

Spatially Separation of Propagation Areas Using Wireless Mesh Networks for Secure Wireless Communication

ARAKI Masataka, MIYAMOTO Shinichi, SAMPEI Seiichi

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 108 ( 222 ) 43 - 48 2008.09

Secure communications against eavesdropper is one of the important requirements in wireless networks, because the propagations of wireless signals are vulnerable and unpredictable. In order to establish secure wireless communications, this paper proposes a technique to spatially separate the propagation area of secret information from those of sub information such as encryption keys. In the proposed technique, multiple nodes other than source and destination nodes transmit sub information required to make secret information and/or extract original information from secret one, and the propagation areas of secret information transmitted from source node are different from those of sub information. Because the transmitted secret information and all of sub information are necessary to extract the original information from secret one, the area where secret information is eavesdropped can be narrowed by using the proposed technique.

A Proposal of Spatial Time Division Multiple Access System based on Intensity Distribution for Hybrid-LOS Indoor Optical Wireless Communication

KAWAMOTO Kenji, MIYAMOTO Shinichi, SAMPEI Seiichi

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 108 ( 188 ) 121 - 126 2008.08

This paper proposes a signal discrimination technique for multiple optical signal streams using an spatial power distribution detection technique and applies it to the spatial division and time division multiple access (SD/TDMA) for the hybrid-line of sight (LOS) indoor optical wireless communication systems. In the proposed SDMA scheme, each terminal simultaneously transmits its data stream, and the signals are detected by plural receivers, where the receivers are located in different positions so that the spatial intensity distribution of the combined optical received signals can be detected. Because the spatial intensity distribution is subject to the data pattern of the transmitted signals from the terminals, the data streams can be discriminated by the observation of the spatial intensity distribution. When the proposed SDMA is further combined with TDMA, a slot scheduling process is further employed in which user signals with high signal discriminatory for the spatial intensity distribution are allocated to the same time slot to enhance system throughput.

C-14-7 A Study on Routing Algorithm for Optical Wireless Mesh Networks

OHTSUBO Yusuke, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2008 ( 1 ) 325 - 325 2008.03

B-5-185 A Study on Wireless Inter-cluster Communication using Bi-directional Traffic Integrated Transmission Technique

WADA Tetsuei, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2008 ( 1 ) 571 - 571 2008.03

B-21-21 A Study on a Route Selection in Wireless Mesh Networks using Bi-directional Traffic Integrated Transmission

HARADA Satoru, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2008 ( 2 ) 622 - 622 2008.03

B-4-72 A Study on Electromagnetic Environment Control Technique Using Multiple Routes Transmission of Sub-channel Signals in Wireless Mesh Network

WATANABE Shinichi, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2008 ( 1 ) 381 - 381 2008.03

Electromagnetic Environment Control Technique Using Multi-hop Wireless Network System

Shinichi Miyamoto

環境電磁工学情報 EMC 231 90 - 105 2008.03

A Study of Transmit Antenna Directivity Control for Suppressing Unnecessary Power Radiation in Ubiquitous Communication Environments

YAMANAKA Masaaki, MORINAGA Norihiko, SAMPEI Seiichi, MIYAMOTO Shinichi

電気学会研究会資料. IS, 情報システム研究会 2007 ( 32 ) 1 - 6 2007.09

Electromagnetic Environment Control Techniques using Wireless Mesh Network System for Secure Wireless Communication

MIYAMOTO Shinichi, ARAKI Masataka, SAMPEI Seiichi

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 107 ( 226 ) 43 - 48 2007.09

For construction of private ubiquitous smart space, how to flexibly introduce wireless communication would be the most challenging requirement. However, one of the most serious problems for deployment of such ubiquitous private wireless network is, unlike public wireless networks, there is no strong coordinator that manages radio resource for all wireless nodes in a centralized way. If each user creates smart space without any consideration, the space will be flooded with electromagnetic wave radiated from many wireless nodes, and electromagnetic environment in such a private space will fall into a chaotic situation. One of the paramount important requirements in wireless communication system is secure transmission of data, because the open air wireless links are vulnerable. Especially, in the future ubiquitous network society, above mentioned chaotic situation will cause the leakage of the transmitted signal to adjacent wireless nodes. In order to solve this problem and to establish secure wireless communications, this paper will propose an electromagnetic environment control techniques using wireless mesh network system. Proposed system adaptively controls the electromagnetic environment by using the adaptive routing, and transmission power control according to the selected route. Numerical results show that the secure wireless communication will be established by increasing the number of hops in multi-hop wireless network system.

A Proposal of an Unnecessary Power Radiation Suppression Technique Using a Transmit Antenna Directivity Contorol in Ubiquitous Communication Environments

YAMANAKA Masaaki, SAMPEI Seiichi, MIYAMOTO Shinichi, MORINAGA Norihiko

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 107 ( 192 ) 63 - 68 2007.08

This paper will propose an unnecessary radiation power suppressing technique to electromagnetically restricted areas in ubiquitous communication environments. An adaptive array antenna is employed in each terminal to control a directivity of transmit antenna not to radiate unnecessary power to the electromagnetically restricted areas while keeping sufficient gain to a target terminal. To identify angle of departures to the electromagnetically restricted areas, a radio power sensor network is assumed. Computer simulation confirms that the unnecessary radiation to the electromagnetically restricted areas is sufficiently suppressed while keeping throughput at a satisfactory level.

B-5-194 A study on enhancement of peak transmission rate using transmit beam directivity control in ubiquitous communication environments

YAMANAKA Masaaki, SAMPEI Seiichi, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2007 ( 1 ) 608 - 608 2007.03

B-21-10 A Study on a Two-way Traffic Integrated Transmission using Analog Waveform Multiplexing in Multi-hop Wireless Networks

HARADA Satoru, MIYAMOTO Shinichi, SAMPEI Seiichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2007 ( 2 ) 599 - 599 2007.03

A Study on the Performance of Multi-hop Wireless Network using Two-way Traffic Integrated Transmission Technique

HARADA Satoru, MIYAMOTO Shinichi, SAMPEI Seiichi

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 106 ( 559 ) 17 - 22 2007.03

This paper proposes two-way traffic integrated transmission technique using digital information multiplexing and analog waveform multiplexing in multi-hop wireless network. In the digital information multiplexing, in order to efficiently relay two-way traffic, data packets are multiplexed by calculating a bitwise exclusive OR. And, in the analog waveform multiplexing which enables an efficient communication in the case of the transmission rate on each link is different, data packets are multiplexed by adding the analog modulated signal after modulation. Computer simulation confirmed that the proposed two-way traffic integrated transmission technique using analog waveform multiplexing can achieve the best performances.

A Study on Two-way Traffic Integrated Transmission using Network Coding Scheme in Multi-hop Wireless Network

HARADA Satoru, MIYAMOTO Shinichi, SAMPEI Seiichi

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 106 ( 420 ) 7 - 12 2006.12

This paper proposes two-way traffic integrated transmission technique using network coding scheme in multi-hop wireless network. In the proposed technique, in order to efficiently relay two-way traffic, we employ network coding scheme which calculates a bitwise exclusive OR. Computer simulation confirmed that the proposed technique can achieve the best performances when two-way traffic is even. Moreover, we propose analog wave form multiplexing which enables an efficient commutication in the case of the transmission rate on each link is different. Computer simulation confirmed that the BER performance which is the almost same as the one under Additive White Gaussian Noise (AWGN) environment can be achieved when the proposed analog wave form multiplexing is used.

A Study on Electromagnetic Environment-aware Wireless Network Using Optical Wireless link

TAMURA Takashi, MIYAMOTO Shinichi

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 106 ( 224 ) 19 - 24 2006.08

In coming ubiquitous network society, a large number of wireless nodes will be omnipresent to a private space, and we can enjoy a variety of services and informations regardless of time or the place by accessing to the network which connected those wireless nodes with each other. The electromagnetic environment in a private space will be in a chaotic situation, because of the radio signal radiated disorderly from many wireless nodes. On the other hand, communications environment in a private space should be adaptive for various information transmissions. Then, it is necessary to construct a wireless network which is considering the electromagnetic environment, and to construct the network where the especially better communications environment can be obtained. In this paper, we propose the construction of the private wireless network using the multi-hop wireless network technology and using an optical wireless link. Computer simulation confirms that the proposed system can improve both of the electromagnetic environment and communications environment.

A Study on QoS Guaranteed Transmission Protocol for Multi-hop Wireless LAN System

KIEU Phuc Khanh, MIYAMOTO Shinichi

IEICE technical report ( The Institute of Electronics, Information and Communication Engineers ) 106 ( 25 ) 85 - 90 2006.04

The widespread use of wireless networking applications has created the need for QoS support in the WLAN systems. The support of video, audio, real-time VoIP and other applications over WLAN with parameterized QoS requirements is the key to success for 802.11 WLAN in multimedia home networking and future wireless communications. The coverage area of WLAN systems is limited and multi-hop WLAN system is considered to be one of the solutions. However, in multi-hop WLAN system, the variation of channel condition of each hop is independent, and then, QoS guaranteed transmission in multi-hop WLAN systems is still difficult and need to be resolved. This paper proposes a multi-hop WLAN system, as a solution to guarantee QoS transmission over a long distance. In this proposed system, by estimating the channel condition of each hop, the appropriate transmission rates can be selected. An algorithm to grant the appropriate transmission opportunity (TXOP) to each hop of the multi-hop WLAN system is also proposed. The numerical simulation results will show that, by using the proposed system, QoS can be guaranteed over a wide coverage area.

A Study on the Compatibility between Electromagnetic Environment and Communication Environment using Multi-hop Wireless Network

TAMURA Takashi, MIYAMOTO Shinichi

IEICE technical report. Electromagnetic compatibility ( The Institute of Electronics, Information and Communication Engineers ) 105 ( 263 ) 103 - 108 2005.09

In the coming ubiquitous network society, it is necessary to construct the flexible private wireless network in which many wireless nodes connect with each other according to the change of the propagation path, the required routing control and amount of information. From the view point of electromagnetic environment in private wireless network, because of the radio signal radiated from many wireless nodes, the electromagnetic environment in private space will be in a chaotic situation, and then, the investigations about the compatiblity between electromagnetic environment and the communication environment in private wireless network will be required. In this study, we focus on the private wireless network using the multi-hop wireless network technology, and investigate the electromagnetic environment in private space and the transmission performance of private wireless network.

B-5-217 Performance of Dual Band Wireless LAN System using Adaptive Channel Selection Technique

HARADA Satoru, MIYAMOTO Shinichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2005 ( 1 ) 666 - 666 2005.03

A Study on the Performance of Wireless LAN System Based on IEEE 802.11g Standard under Man-made Noise Environment

SHIOTSUKI Akihiko, MIYAMOTO Shinichi, MORINAGA Norihiko

IEICE technical report. Electromagnetic compatibility ( The Institute of Electronics, Information and Communication Engineers ) 104 ( 328 ) 81 - 86 2004.10

In a new standard for 2.4GHz-band wireless LAN system, IEEE 802.llg, Orthogonal Frequency Division Multiplexing (OFDM) is adopted as a transmission scheme and it enables high speed transmission up to 54Mbps. However, 2.4GHz radio frequency band is also used for ISM devices, and the man-made noise leaked from ISM devices will cause the performance degradation of 2.4GHz-band wireless LAN systems. In this paper, we evaluate the BER and the throughput performances of wireless LAN system based on IEEE 802.11g standard under man-made noise environment. Numerical results show that the performance of wireless LAN system based on IEEE 802.11g standard is much degraded by the effect of man-made noise.

B-5-234 A Study on Channel Selection in Dual Band Wireless LAN System

HARADA Satoru, MIYAMOTO Shinichi

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2004 ( 1 ) 721 - 721 2004.03

A Study of Shadowing for the Indoor Infrared Wireless Communication System using Infrared Wireless Repeater

MIYAOKA Katsuya, MIYAMOTO Shinichi, MORINAGA Norihiko

ITE technical report ( 映像情報メディア学会 ) 28 ( 14 ) 13 - 16 2004.02

A Proposal of Indoor Infrared Wireless Communication System with Overlay Construction of Line-of-Sight System using CSMA/CA

NAKAGAWA Jun, MIYAMOTO Shinichi, MORINAGA Norihiko

ITE technical report ( 映像情報メディア学会 ) 28 ( 14 ) 9 - 12 2004.02

A Study on the Effect of Man-made Noise on the Performance of 2.4GHz-band Wireless LAN System using OFDM

SHIOTSUKI Akihiko, MIYAMOTO Shinichi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 103 ( 680 ) 91 - 96 2004.02

In a new standard for 2.4GHz-band wireless LAN system, IEEE802.11g, Orthogonal Frequency Division Multiplexing (OFDM) is adopted as a transmission scheme and it enables high speed transmission up to 54Mbps. However, 2.4GHz radio frequency band is also used for ISM devices, and the man-made noise leaked from ISM devices will cause the performance degradation of 2.4GHz-band wireless LAN systems. In this paper, as a basic study of the effect of man-made noise emitted from ISM devices to the performance of 2.4GHz-band wireless LAN system based on IEEE802.11g standard, we evaluate the BER and the throughput performances of 2.4GHz-band wireless LAN system using OFDM transmission scheme under man-made noise environment. Numerical results show that the performance of 2.4GHz-band wireless LAN system using OFDM transmission scheme is much degraded by the effect of man-made noise.

A Study on Fragmentation in 2.4GHz-band Wireless LAN System under Bluetooth Interference Environment

SAKAI Tomoko, MIYAMOTO Shinichi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 103 ( 680 ) 97 - 102 2004.02

The performance of 2.4GHz-band wireless LAN systems is degraded by mutual interference under Bluetooth coexistence environment. IEEE802.11b standard supports multiple rates transmission and fragmentation which can reduce the degradation of performance under the influence of noise and/or interference. It is possible to reduce the degradation of performance under Bluetooth interference by using these techniques individually and more improvement is expected by using both techniques. In this paper, we propose a technique of selecting transmission rate and data length of fragmentation every packet according to propagation condition in order to avoid the performance degraded by Bluetooth interference. Numerical results conclude that the performance of 2.4GHz-band wireless LAN system is improved by using the proposed system.

A Study on Adaptive Packet Transmission Scheme for Bluetooth System

HATANAKA Toshihiko, MIYAMOTO Shinichi, MORINAGA Norihiko

IEICE technical report. Information networks ( The Institute of Electronics, Information and Communication Engineers ) 103 ( 365 ) 55 - 60 2003.10

In Bluetooth system, multipath fading and/or inter-system interference cause the fluctuation of channel condition,and they are considerd to be one of the major reasons of the degradation of throughput performance. In this paper, an Adaptive Packet Transmission scheme is proposed as a method to improve the throughput performance under multipath fading and/or inter-system interference channels. In this scheme, short-term channel condition is estimated, and the optimum length and error correction code of transmitted packets are selected on a packet-by-packet basis. We compare the throughput performance of proposed scheme with that of conventional scheme and confirm that the proposed scheme lowers the degradation of throughput performance under fading and/or inter-system interferece channels.

A Study on Performance of 2.4GHz-band Wireless LAN System using OFDM under Man-made Noise Environment

SHIOTSUKI Akihiko, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2003 ( 1 ) 667 - 667 2003.03

A Study on the Performance of Line-of-Sight Indoor Infrared Wireless Communication System with Overlay Construction using Infrared Wireless Repeater

NAKAGAWA Jun, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2003 ( 1 ) 786 - 786 2003.03

A Study on Adaptive Selection of Error Correction Coding Scheme in Bluetooth System

HATANAKA Toshihiko, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2003 ( 1 ) 720 - 720 2003.03

A Study on the Indoor Radio-Infrared Hybrid Wireless LAN System

KAWACHI Isao, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 788 - 788 2003

A Study on Fragmentation in 2.4GHz-band Wireless LAN System under Bluetooth Interference Environment

SAKAI Tomoko, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 668 - 668 2003

A Study on the Coverage for the Indoor Infrared Wireless LAN System using Infrared Wireless Repeater

MIYAOKA Katsuya, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 787 - 787 2003

Performances of 2.4GHz-band Wireless LAN Systems using Adaptive Multi-code Transmission Technique

WATANABE Kazuhiro, MIYAMOTO Shinichi, MORINAGA Norihiko

The Transactions of the Institute of Electronics,Information and Communication Engineers B ( The Institute of Electronics, Information and Communication Engineers ) 85 ( 12 ) 2209 - 2222 2002.12

近年,WWW(World Wide Web)や電子メール等,インターネットサービスに代表されるコンピュータネットワークの急速な普及に伴い,インターネット接続を要望するユーザが増加してきている.特に,ノートパソコンやPDA(Personal Digital Assistant)等,小型携帯情報端末や情報家電機器の普及に伴い,時や場所に拘束されることなくネットワークへの接続やそれらの端末どうしを相互に接続する無線によるオフィス内,家庭内ローカルエリアネットワーク(LAN)を利用するユーザが増加している.様々な無線LANシステムのなかでも,2.4GHz帯無線LANシステムは,利用周波数帯の拡大,低価格化,並びに免許不要など,ユーザが利用しやすい環境が整ってきていることから注目されている.しかしながら,有線系ネットワークと比較してその伝送速度は依然不十分であり,更なる高速化技術の進展が望まれている.また,ISM(Industrial, Scientific and Medical)機器と重畳する周波数帯を利用するため,ISM機器から発生する人工雑音により,伝送特性は大幅に劣化する.本論文では,2.4GHz帯無線LANシステムの伝送特性の改善を目的として,伝搬路状況に応じて同時伝送符号数を適応的に変化させる適応マルチコード伝送方式を提案し,提案方式の伝送特性に関する検討を行っている.その結果,伝搬路状況が良好な場合においては,従来を上回る最大22Mbpsの高速伝送が実現できること,並びに,人工雑音発生時等,伝搬路状況が劣悪な場合においては,低速ながらもある程度の伝送速度を確保できることを確認した.また,一様フェージング環境下並びに周波数選択性フェージング環境下においても同様に提案方式の伝送特性について検討を行い,一様フェージング環境下における本提案方式の有効性の確認並びに周波数選択性フェージング環境下での遅延波の影響について考察した.

A Proposal of Indoor Infrared Wireless Communication System with Overlay Construction of Directed Line-of-Sight System and Hybrid Line-of-Sigh System

KOBAYASHI Junichi, MIYAMOTO Shinichi, MORINAGA Norihiko

IEICE technical report. Communication systems ( The Institute of Electronics, Information and Communication Engineers ) 102 ( 256 ) 41 - 46 2002.08

A line-of-sight(LOS) optical communication system has been taking a great attention, as it achieves a high speed,high capacity indoor wireless network system. In this paper,we discuss the performance of LOS wireless communication system and propose the overlay system with directed directed LOS system and hybrid LOS system in order to increase the capacity of terminal and achieve the high speed transmission rate. Numerical results conclude that the proposed system achieves the decrease of coverage by allocating the adequate power.

A Study on Effect of FH-SS Wireless Communication System on Performance of 2.4GHz DS-SS Wireless LAN System

SHINYA Osamu, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2001 ( 1 ) 724 - 724 2001.03

A Study on the Performance of Indoor Infrared Wireless Packet Communication System using CDMA

KINOSHITA Takuya, MIYAMOTO Shinichi, HIROHASHI Kazutoshi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2001 ( 1 ) 702 - 702 2001.03

A Study on the Frame Format and Performance of 2.4GHz-band Wireless LAN System using Adaptive Multicode Transmission

WATANABE Kazuhiro, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2001 ( 1 ) 683 - 683 2001.03

A Study on High-speed and High-quarity Transmission Techniques in 2.4GHz-band DS-SS Wireless LAN System

MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2001 452 - 453 2001.03

A Study on the Performance of 2.4GHz-band DS-SS Wireless LAN System using Adaptive Array Antenna under Man-made Noise Environment

MATSUURA Mitsuyasu, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2001 ( 1 ) 352 - 352 2001.03

A Study on Channel Assignment in 2.4GHz-band Wireless LAN System

LEE Atsushi, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2001 ( 1 ) 681 - 681 2001.03

A Study on the Performance of TDMA Indoor Infrared Wireless Communication System with Space Division Zone Construction

KOBAYASHI Junichi, MIYAMOTO Shinichi, HIROHASHI Kazutoshi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 703 - 703 2001

A Study on Multiple-beams and Multiple-detectors for PPM/CDMA based Diffuse Indoor Infrared Wireless Communication System

YAMANE Takahiro, MIYAMOTO Shinichi, HIROHASHI Kazutoshi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 100 ( 345 ) 115 - 122 2000.10

Code division multiple access (CDMA) scheme is a current subject of great interest as a multiple access scheme for indoor infrared wireless communication system. In this paper, we discuss the performance of CDMA based diffuse indoor infrared wireless communication system and propose the multiple-beams transmitter and the multiple-detectors receiver. Numerical results conclude that the improvement in various performance of PPM-CDMA based system are achieved by using the proposed system.

A Study on the Performance of 2.4GHz Band Wireless LAN System using Adaptive Multicode Transmission

WATANABE Kazuhiro, MIYAMOTO Shinichi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 100 ( 278 ) 9 - 14 2000.09

With the increase of demands for Wireless Local Area Network (WLAN) systems, 2.4GHz band WLAN system has been taking a great attention, as it provides attractive features such as relative high-speed transmission, low cost, and unnecessity of the license. However, it is well known that the performance of conventional 2.4GHz band WLAN systems based on IEEE802.11-1997 and IEEE802.11b standards are seriously degraded by burst noise such as man-made noise emitted from ISM apparatus, and that the maximum transmission rate achieved by 2.4GHz band WLAN system is quite lower than one achieved by Wired LAN. In this paper, we propose a techique to suppress burst noise such as man-made noise in the DS-SS system and to achieve high-speed rate transmission using adaptive mutlicode transmission which changes the number of codes according to propagation condition. Numerical results conclude that performance of transmission rate can be much improved by using the proposed system.

A Study on the CNR Estimation under Man-made Noise and Multipath Fading Environments and Its Application to Improvement of 2.4GHz Band Wireless LAN System with Sector Antenna

TOU Shinpei, MIYAMOTO Shinichi, MORINAGA Norihiko

IEICE technical report. Electromagnetic compatibility ( The Institute of Electronics, Information and Communication Engineers ) 100 ( 207 ) 13 - 18 2000.07

With the increase of demands for Wireless Local Area Network(WLAN) systems, 2.4GHz band WLAN system has been taking a great attention, as it provides the attractive features such as relative high-speed transmission, low cost, and unnecessary of the license. However, the performance of 2.4GHz band WLAN system is seriously degraded by man-made noise emitted from ISM apparatus and multipath fading caused by multipath propagation of transmitted signal. Since radio channel is varied with time under man-made noise and multipath fading environments, it is effective to estimate channel condition for the improvement which adapt to time varying of the channel. In this paper, we focus on Carrier-to-Noise Power Ratio(CNR) as the most basic parameter which characterizes radio channel condition, and evaluate performance of CNR estimation under man-made noise and multipath fading environments. And next, we evaluate the improvement in Bit Error Rate performance of 2.4GHz band WLAN system using sector antenna with CNR estimation.

A Study on CNR Estimation and its Application to Improvement of Performance using Sector Antenna in 2.4GHz Band Wireless LAN System

TOU Shinpei, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2000 ( 1 ) 622 - 622 2000.03

The Influence of Inverter Fluorescent Lamp in Optical Wireless Communication System

SASAO Takayoshi, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2000 ( 1 ) 630 - 630 2000.03

A Study on the Path Diversity Technique for PPM/CDMA Non-directed Diffuse Indoor Infrared Wireless Communication System using Multiple-beams and Multiple-detectors

YAMANE Takahiro, MIYAMOTO Shinichi, YAMADA Kiriko, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2000 ( 1 ) 628 - 628 2000.03

A Study on the Performance of 2.4GHz Band Wireless LAN Systems using Adaptive Multicode Transmission under Man-made Noise Enviromnent

WATANABE Kazuhiro, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2000 ( 1 ) 623 - 623 2000.03

A Study on a Man-made Noise Reduction Technique using Adaptive Array Antenna in 2.4GHz Band Wireless LAN System

MATSUURA Mitsuyasu, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2000 ( 1 ) 320 - 320 2000.03

A Study on the Performance of Indoor Infrared Wireless Communication System using PPM/CDMA with Gold Codes

KINOSHITA Takuya, MIYAMOTO Shinichi, HIROHASHI Kazutoshi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2000 ( 1 ) 627 - 627 2000.03

A Study on the Influence of Interference Light for Indoor Infrared Wireless Communication System with Overlapping Zone Construction

MOCHINAGA Kazuhiro, MIYAMOTO Shinichi, SASAO Takayoshi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2000 ( 1 ) 626 - 626 2000.03

A Study of the Reflection from the Wall for the Diffuse Reflection Optical Wireless System

YAMADA Kiriko, SAKAI Masahisa, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 629 - 629 2000

Parameter Estimation and Error Rate Performance of Optimum Receiver under Class-A Impulsive Radio Noise Environment

KANEMOTO Hideki, MIYAMOTO Shinichi, MORINAGA Norihiko

The Transactions of the Institute of Electronics,Information and Communication Engineers B ( The Institute of Electronics, Information and Communication Engineers ) 82 ( 12 ) 2364 - 2374 1999.12

高周波デバイスを用いた電子機器等から発生する人工雑音の多くはガウス雑音とは大きく異なった統計的性質を有するため,人工雑音環境下においてはガウス雑音下での使用を前提として設計された従来の受信機の誤り率特性は大きく劣化することが知られている.そのような人工雑音環境下においても良好な誤り率特性を確保する方法の一つとして,人工雑音環境に対する最適受信機が提案されている.この最適受信機は人工雑音の統計的性質に基づいて最ゆうシンボル判定を行うことにより良好な誤り率特性を達成するものであり,最適受信を行うに際しては人工雑音の統計的性質を事前に推定しておく必要がある.そこで本論文では,人工雑音の統計モデルとして,MiddletonのクラスAインパルス性無線雑音モデルを用い,最適受信を行う際に必要となるクラスAインパルス性無線雑音のパラメータ推定並びに推定結果に基づいてパラメータ設定された最適受信機の誤り率特性について検討を行っている.まず,クラスAインパルス性無線雑音環境下における最適受信について示し,人工雑音のパラメータ推定誤差が最適受信機の誤り率特性に及ぼす影響を評価し,人工雑音環境下において最適受信による特性改善を得るためには,雑音の統計をある程度適切に反映するパラメー夕を用いて最適受信を行う必要があることを明らかにしている.次に,推定に用いる雑音サンプル数とパラメータ推定の精度について検討し,高精度なパラメータ推定を行うには膨大な雑音サンプルを必要とするものの,ある程度の雑音サンプル数(例えば,重複指数A=0.05,ガウス成分比Γ'=0.05の場合は約700サンプル)から推定されるパラメータを用いた最適受信によっても,人工雑音環境下においても十分良好な誤り率特性が得られることを明らかにしている.

A Study on Man-Made Noise Elimination Technique for ISM-Band DS-SS Systems Using Multicode and Noise Observation Channel

UNAWONG Sakda, MIYAMOTO Shinichi, MORINAGA Norihiko

電気学会研究会資料. : The Papers of Technical Meeting on Electromagnetic Theory, IEE Japan. EMT, 電磁界理論研究会 1999 ( 55 ) 11 - 18 1999.08

A Study on Hybrid Line-of-Sight Indoor Infrared Wireless Communication System with Overlapping Zone Construction

MOCHINAGA Kazuhiro, MIYAMOTO Shinichi, HIROHASHI Kazutoshi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 99 ( 220 ) 79 - 84 1999.07

As an indoor infrared wireless communication system, a multiple zone construction system has been taking a great attention as it achieves high spectrum efficient indoor wireless communication. In a conventional multiple zone system, since the multiple zones must be arranged without receiving interference lights from adjacent satellites, the whole room cannot be covered by infrared wireless communication system. In order to cover the whole room with coverage, however, overlapping zone construction may be applied despite a bad influence of the interference light. In this case, if the terminals are oriented to a satellite, the effects of the interference light decreases. Moreover, as terminals on overlapping zone can select a desired satellite from among accessible satellites, we can expect the improvement of the throughput performance and tolerance to shadowing. In this paper, we propose overlapping zone construction for line-of-sight indoor infrared wireless communication system and show that the performance of packet error rate and throughput can be much improved by using the proposed system.

A Study on the CNR Estimation under Man-made Noise Environment and Application to Improvement of Digital Radio Communications System with Sector Antenna

TOU Shinpei, MIYAMOTO Shinichi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 99 ( 220 ) 1 - 6 1999.07

It is well-known that man-made noise emitted from ISM apparatus is one of the major causes of errors in ISM-band wireless local area network (LAN) systems. In general, man-made noise is not always emitted from ISM apparatus and the emission level of man-made noise is considered to vary with time. Therefore, in order to improve the performance of ISM-band wireless LAN system, the noise emission level is adaptively estimated by the wireless communication system. Carrier to noise power ratio (CNR) is the most basic parameter characterizing man-made noise and it will be widely applied to several countermeasures against man-made noise. In this paper, we discuss the CNR estimation in ISM-band wireless LAN under man-made noise environment and evaluate the bit error rate performance using sector antenna with the CNR estimation.

B-4-68 A Study on the Effect of Antenna Pattern on the Performance of Man-made Noise Reduction Technique using Sector Antenna

YOSHIZAWA Kensuke, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1999 ( 1 ) 349 - 349 1999.03

B-5-274 A Study on CNR Estimation under Man-made Noise Environment and Application to Noise Reduction Technique using Sector Antenna

TOU Shinpei, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1999 ( 1 ) 625 - 625 1999.03

B-5-265 A Study on the Performance of Non-directed Diffuse Indoor Infrared Wireless Communication System using PPM/CDMA

YAMANE Takahiro, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1999 ( 1 ) 616 - 616 1999.03

B-5-262 Spectrum Efficient Indoor Wireless Network System using Infrared Wireless Communication and Countermeasures against Shadowing

HIRAYAMA Yoshiyasu, MIYAMOTO Shinichi, SAKAI Masahisa, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1999 ( 1 ) 613 - 613 1999.03

B-5-264 A Study on the Beam Diversity Technique for Non-directed Line-of-Sight Indoor Infrared Wireless Communication System

MIYANAGA Kenji, MIYAMOTO Shinichi, SASAO Takayoshi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1999 ( 1 ) 615 - 615 1999.03

SAB-1-1 A Study on the Zone Construction of Non-directed Line-Of-Sight Indoor Infrared Wireless Communication System using PM/CDMA

FUNABIKI Makoto, MIYAMOTO Shinichi, HIROHASHI Kazutoshi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1999 ( 2 ) 672 - 673 1999.03

小型情報処理端末やディジタル音響映像(AV)機器の急速な普及に伴い, ディジタル情報の伝達ならびに共有を目的として, それらの機器を相互に接続するオフィス/ホームネットワークの構築が注目されている。室内においてネットワークを構築する場合, その接続形態としては有線方式と無線方式に大別することができる。この内, 有線方式では高速かつ大容量・高品質なネットワークを実現できるため, トラヒックの集中するネットワークの基幹部分に適用するには適した方式であるが, 新規構築や端末の追加・再配置には柔軟に対処することはできない。それに対し, 無線方式の場合は, 伝送速度や品質の面では有線方式に劣るものの, 端末の増減や再配置に対しても柔軟に対応でき, システム構成の柔軟性・拡張性に優れることから, ネットワークにおけるEnd-to-Userの箇所に適用するには適した方式である。中でも, 伝送媒体に赤外線領域の光搬送波を用いる室内光無線通信システムは, 光搬送波の有する広帯域性ならびに伝搬路制御の容易性を活かした高速かつ大容量高密度な室内無線通信システムとして注目されている。室内光無線通信システムにおける多元接続方式としては, 電波を用いたシステムと同様に, 副搬送波による多重化, 波長分割(WDMA), 時分割(TDMA)などの多元接続方式が考えられるが, 出力電力の限界・光源の波長の不安定性・受光素子の低い波長選択性・同期確保の必要性などの理由により, それらの適用は困難であると考えられる。一方, 符号分割多元接続(CDMA)方式は, 光源の変調速度の限界により拡散帯域が制限されるものの, 上記の多元接続方式よりも比較的容易に実現できること, ならびにad-hocなネットワークでの適用が可能であることなどから注目される方式である。しかしながら, 無指向直射室内光無線通信システムの多元接続方式としてCDMA方式を適用した場合は, 干渉端末からの干渉光の影響による特性劣化が生じる。特に, Uplink(端末→サテライト)においては, 端末がゾーン中心から離れるに従い受信光電力が大きく減少するため, Uplinkにおける各端末からの受信光電力差が大きくなり, 遠近問題が顕著に現れるものと考えられる。そこで, 本稿では, 無指向直射方式を用いた室内光無線通信システムにおいて, 多元接続方式としてCDMA方式を適用した場合のUplinkにおける誤り率特性を評価するとともに, 収容端末の増加ならびにUplinkでのD/U比(希望波対干渉波電力比)の補償を目的として, 光搬送波の有する高指向性・集光性を利用したゾーン構成を提案する。さらに, 提案ゾーン構成において, アクセス制御方式としてスロット付きALOHA方式を用いた場合の特性を評価し, スループットならびにパケット誤り率の観点から提案ゾーン構成の有効性について検証する。

B-5-263 A Study on Hybrid Line-of-Sight Indoor Infrared Wireless Communication System with Overlapping Zone Construction

MOCHINAGA Kazuhiro, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1999 ( 1 ) 614 - 614 1999.03

A Study on Non-directed Line-of-Sight Indoor Optical Wireless Communication System using PPM/CDMA

FUNABIKI Makoto, MIYAMOTO Shinichi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 98 ( 537 ) 87 - 94 1999.01

Code division multiple access(CDMA) scheme is a current subject of great interest as a multiple access scheme for indoor optical wireless communication system. In This paper, we discuss the performance of line-of-sight indoor optical wireless communication system using PPM/CDMA scheme. At first, we evaluate the BER performance of conventional PPM/CDMA system and show that the effect of the interference much degrades the performance of conventional PPM/CDMA system. And next, in order to compensate the effect of interference, we propose the multiple cell system and evaluate the BER and throughput performance of proposed system.

A Study on the Multiple Zone Construction for Indoor Optical Wireless Communication System and Countermeasures against Shadowing

HIRAYAMA Yoshiyasu, MIYAMOTO Shinichi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 98 ( 537 ) 79 - 86 1999.01

A line-of-sight(LOS) optical wireless communication system with multiple zone construction has been taking a great attention, as it achieves a high speed, high capacity and high spectrum efficient indoor office/home wireless network system. However, in the LOS optical wireless communication system with multiple zone construction, the error performance will be degraded by the reflection light from an adjacent zone. In this paper, regarding the influence of the reflection light, we show the improvement of capacity and the required transmission power by using the multiple zone construction system. Moreover, in order to solve the problems that LOS system is susceptible to severe shadowing and has a limited coverage, we propose a optical and radio hybrid wireless communication system. Numerical results conclude that the performance of packet error rate and throughput can be much improved by using the proposed system.

B-5-275 Performance of the ISM-band DS-SS System with Multiple Long codes under Man-made Noise Environments

SAKDA, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 626 - 626 1999

A Study on the Prameter Estimation of Class-A Impulsive noise and Optimum Reception

KANEMOTO Hideki, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the Society Conference of IEICE ( The Institute of Electronics, Information and Communication Engineers ) 1998 ( 1 ) 215 - 215 1998.09

2)PPM/CDMA方式を用いた無指向直射室内光無線通信システムの誤り率特性に関する検討(無線・光伝送研究会)

船引誠, 宮本伸一, 森永規彦

映像情報メディア学会誌 : 映像情報メディア ( 一般社団法人映像情報メディア学会 ) 52 ( 7 ) 956 - 956 1998.07

Performance of Digital Radio Communication System with Sector Antenna under Man-made Noise Environment

YOSHIZAWA Kensuke, MIYAMOTO Shinichi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 98 ( 159 ) 23 - 30 1998.06

Man-made noise emitted from ISM apparatus is known to be one of the major causes of errors in digital radio communications systems. Although the man-made noise emitted form ISM apparatus is propagated through multipath radio channel, the direct path component appears to be a highest level component which dominates the perfomance of digital radio communication system. In the paper, we propose the way to eliminate the direct path component of man-made noise with sector antenna at the receiver. Numerical results conclude that the error performance can be much improved by using the proposed system.

2)PPM/CDMA方式を用いた無指向直射室内光無線通信システムの誤り率特性に関する検討(無線・光伝送研究会)

船引誠, 宮本伸一, 森永規彦

映像情報メディア学会誌 : 映像情報メディア ( 一般社団法人映像情報メディア学会 ) 52 ( 6 ) 834 - 834 1998.06

A Proposal of Optical Wireless Cells for Indoor Packet Radio Communication System

HIRAYAMA Yoshiyasu, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1998 ( 1 ) 631 - 631 1998.03

A Proposal of Non-directed Diffuse Optical Wireless Communication System with Regenerative Repeater

MIYAMOTO Shinichi, IMAMURA Kimihiko, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1998 ( 1 ) 627 - 627 1998.03

A Study on the Performance of Radio Communication System with Sector Antenna under the Man-made Noise Environment

YOSHIZAWA Kensuke, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1998 ( 1 ) 699 - 700 1998.03

A Study on the Performance of Non-directed Line-of-Sight Indoor Optical Wireless Communication System using PPM/CDMA

FUNABIKI Makoto, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1998 ( 1 ) 630 - 630 1998.03

A Study on Non-directed Diffuse Optical Wireless Communication System with Regenerative Repeater

IMAMURA Kimihiko, MIYAMOTO Shinichi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 97 ( 489 ) 151 - 158 1998.01

In order to obtain a high received optical signal power for non-directed diffuse indoor optical wireless communication system, we have proposed multi-beam and multi-detector repeater using optical amplifer. However, if the optical amplifier gain is restricted, optical amplifier will not emit the enough transmitted power, and then the enough received signal power will not be obtained by the receiver. In this paper, in order to transmit the enough signal power from the repeater, we propose regenerative repeater and discuss the performance improvement of non-directed diffuse system achieved by this proposed repeater. Numerical results conclude that, by using proposed repeater, the transmission speed and the coverage can be much improved compared to those of conventional non-directed diffuse optical system.

室内光無線通信システムの高速大容量化広域化に関する検討

宮本伸一

電子情報通信学会 98 25 - 32 1998

室内光無線通信システムの高速大容量化広域化に関する検討

宮本伸一

信学技報 98 370 - 377 1998

Performance of TDMA Radio Communication System with BCH Coding under Man-made Noise Environment

MIZUGAKI Kenichi, MIYAMOTO Shinichi, MORINAGA Norihiko

IEICE technical report. Electromagnetic compatibility ( The Institute of Electronics, Information and Communication Engineers ) 97 ( 400 ) 1 - 8 1997.11

It was already reported that the noise emitted from microwave oven significantly degrades the performance of digital radio communication system. In this paper, in order to obtain a good error performance under microwave oven noise environment, we employ the BCH error correction coding scheme and investigate the performance improvement achieved by BCH codes. Numerical results conclude that, by applying BCH coding and bit interleaving schemes, the performance of digital radio communication system can be greatly improved. Moreover, we also take a frame structure of TDMA-TDD into account and discuss the interleaving method which achieves much performance improvement with short decoding delay.

A Study on the Zone Construction for Non-Directed LOS Indoor Optical Wireless Communication System

MIYANAGA Kenji, MIYAMOTO Shinichi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 97 ( 266 ) 81 - 86 1997.09

As an indoor wireless communication system, a line-of-sight(LOS) optical communication system has been taking a great attention. In the conventional LOS system, the cormmunication area is covered only one wide optical beam and then the conventional LOS system is mainly used as the point-to-point or broadcast communication system. In this paper, by using the narrowness of optical beam width, we propose a zone construction of LOS system and discuss the increase of capacity by dividing communication channel spatially. Numerical results conclude that the capacity of LOS system with propdsed zone construction is much increased compared to that of conventional one. Moreover, we propose the multiple zone construction system and show the improvement of capacity and the required transmission power.

9)空間分割多元接続を用いた無指向直射通信システムに関する一検討(無線・光伝送研究会)

宮長健二, 宮本伸一, 森永規彦

映像情報メディア学会誌 : 映像情報メディア ( 一般社団法人映像情報メディア学会 ) 51 ( 7 ) 1005 - 1005 1997.07

8)送受信ダイバーシチを用いた無指向拡散反射室内光無線通信システムに関する研究(無線・光伝送研究会)

森岡宗平, 宮本伸一, 森永規彦

映像情報メディア学会誌 : 映像情報メディア ( 一般社団法人映像情報メディア学会 ) 51 ( 7 ) 1005 - 1005 1997.07

A Study on the Zone Construction for Non-directed Line-of-Sight Indoor Optica1 Wireless Communication System

MIYAHAGA Kenji, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1997 ( 1 ) 634 - 634 1997.03

光搬送波を用いた室内光無線通信システムは, 光搬送波の有する広帯域性ならびに高い指向性, 集光性から, 高速かつ大容量な室内無線通信システムとして注目されている. 中でも, 直射方式は見通し内伝搬路を確保する必要があるものの, 最も高速かつ高品質なシステムを実現し得る方式として注目されている. 従来の直射方式を用いた室内光無線通信システムは, 天井面等に設置された1つの送信機で半径1O[m]程度の単一のゾーンを構成し, 1対1通信もしくは単方向放送型の通信が主であった. 本稿では, 直射方式のゾーン構成として, 光信号の特長の1つである狭指向性を利用したゾーン構成を提案し, 通信チャネルを空間的に分割し複数の端末を収容することによる通信容量の増加について検討を行う.

Performance of Radio Communication System with BCH Coding under Microwave Oven Interference Environment

MIZUGAKI Kenichi, MIYAMATO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1997 ( 1 ) 510 - 510 1997.03

近年の無線通信システムのパーソナル化ならびに高周波テバイスを用いた電子機器の普及に伴い, 電子機器等から発生する妨害波存在下での無線通信システムの使用が予想される. 特に, 最近のディジタル無線通信システムが使用する準マイクロ波帯においては, ISM(Industrial, Scientific and Medical)機器の周波数帯として2.5GHz帯が割り当てられており, 準マイクロ波帯を使用するディジタル無線通信システムの受信特性はISM機器から発生する妨害波の影響によって大きく劣化することが報告されている. そこで本稿では, 家庭用電磁機器としで広く普及しているISM機器である電子レンジから発生する妨害波を対象とし, 電子レンジ妨害波存在下における誤り訂正符号を用いたディジタル無線通信システムの誤り率特性を評価し, 誤り訂正符号の適用による特性改善効果について検討する.

A Study on the Performance of ISM-band Wireless LAN System under Microwave Oven Interference Environment

UNAWONG Sakda, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1997 ( 1 ) 668 - 668 1997.03

近年の無線通信システムのパーソナル化ならびに高周波デバイスを使用したISM(Industrial, Scientific and Medical)機器の普及に伴い, ISM機器から発生する妨害波の影響による無線通信システムの受信特性の劣化が問題となっている. 本稿では, 妨害波発生源として普及率の高いISM機器である電子レンジを, また影響を受ける無線通信システムとしてISM帯無線LANに用いられる直接拡散/スペクトル拡散通信方式(DS/SS)を想定し, 電子レンジから発生する妨害波がDS/SS方式の受信特性に及ぼす影響の評価ならびに妨害波の統計的性質に基づく受信機の提案を行ない, 提案受信機を用いることによる特性改善効果について検討する.

A Study on the Optimum Reception Under Microwave Oven Interference

KANEMOTO Hideki, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1997 ( 1 ) 345 - 345 1997.03

高周波デバイスを用いたISM(Industrial, Scientific and Medical)機器の普及ならびに無線通信システムのパーソナル化に伴い, ISM機器から発生する妨害波の影響による無線通信システムの受信特性の劣化が懸念されている. そのような妨害波存在下においても良好な誤り率特性を達成するためには, 妨害波の統計的性質のモデル化ならびにその統計的性質に基づくシステム設計を行う必要がある. これまで我々は, 電子レンジから発生する妨害波を対象として, クラスAインパルス性雑音による妨害波のモデル化についての検討を行い, 電子レンジ妨害波の1次の統計的性質はクラスAインパルス性雑音モデルにより十分にモデル化できることを報告している. 本稿では, 妨害波の数学的モデルに基づく最適受信機を構成し, その誤り率特性ならびにインタリーブを用いた特性改善方法について検討を行う.

Delay Spread Suppression Method for Non-directed Diffuse Indoor Optical Wireless Communication System With Multi Beam Transmitter

NISHIDA Kaoru, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1997 ( 1 ) 637 - 637 1997.03

無指向拡散反射方式室内空間伝送光通信システムにおいて, 広範囲な領域に亘って高い受信光電力を達成し通信可能距離の拡大を図る方式として, 複数の光源を有する送信機を用いたマルチビーム方式が提案されている. しかしながら, マルチビーム方式では, 信号光が送信機から受信機へ到達する際の伝搬遅延時間が各光源ごとに異なるため遅延広がりの増大を招き, 高速伝送時には, 受信光電力の増大にもかかわらず, 符号間干渉により特性が劣化する問題がある. そこで本稿では, 送信側もしくは受信側において伝搬遅延時間差を補償することで遅延広がりを抑圧し, マルチビーム方式において高速かつ広範囲な領域における通信を実現する方法を提案し, この方法を用いた場合の信号伝送特性およひ誤り率特性について検討を行う.

A Study on the Performance of DS/CDMA System under Microwave Oven Interference Environment

UNAWONG Sakda, MIYAMOTO Shinichi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 96 ( 529 ) 63 - 70 1997.02

In this paper, we investigate the effect of microwave oven interference on the performance of DS/CDMA system. At first, using the microwave oven interference measurement result, the statistical characteristics of the interference is studied, and then the performance of DS/CDMA system under microwave oven interference environment is evaluated. The evaluation result indicates that the presence of microwave oven interference significantly degrades the performance of DS/CDMA system. Moreover, we propose the receivers of DS/CDMA system for microwave oven interference environment and show the performance improvement achieved by using these proposed receivers.

A Performance Evaluation of Multi Beam Transmitter System with Directional Diversity Receiver

NISHIDA Kaoru, MIYAMOTO Shinichi, TSUKAMOTO Katsutoshi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers ) 96 ( 529 ) 71 - 78 1997.02

In order to obtain a high received optical signal power for non-directed diffuse indoor optical wireless communication system, a multi beam transmitter system has been proposed. For the case of high data transmission rate, however, the performance of multi beam transmitter system is much degraded because of the ISI caused by increased delay spread. In this paper, in order to suppress the delay spread of multi beam transmitter system, we propose two delay spread suppression methods, and evaluate the performance improvement achieved by proposed methods. Numerical results show that, by using proposed methods, the delay spread of multi beam transmitter system is suppressed and multi beam transmitter system can achieve better performance in high data transmission rate.

Spectrum Efficiency of Indoor Optical Wireless Communication System

MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 635 - 635 1997

搬送波に光信号を用いる室内光無線通信システムは, 光搬送波の有する特微である広帯域性を利用した高速かつ大容量なシステムとして注目されている. 本稿では, 光搬送波の有する狭指向性および指向制御の容易性に着目し, 直射方式を用いた室内光無線通信システムの周波数利用効率を評価し, 周波数利用効率の観点から室内光無線通信システムの有効性について検討する.

A Study on the Non-directed Diffuse Optical Wireless Communication System with Cascade of Multi-beam Repeaters

IMAMURA Kimihiko, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 636 - 636 1997

搬送波に光信号を用いる室内光無線通信システムは, 潜在的広帯域性等の光信号の有する優れた特長を利用した方式として注目されている. 中でも, 指向制御および見通し内伝搬路を必要としない無指向拡散反射方式は, システム構成の柔軟性の面から考えると最も望ましい方式といえる. しかしながら, この方式では送受信機間距離が大きくなるに従い受信光電力が急傲に低下するため, 伝送速度および通信可能距離が大きく制限される. これまで, 筆者らは, 無指向拡散反射方式において, 送受信機間距離が離れた場合においても十分な受信光電力を確保する方法として, 中継器を用いたシステムを提案している. しかしながら, 単一の中継器を用いた場合は, 通信可能距離を20[m]程度まで拡大できるものの, 広領域に亘る信号光電力の送信ならびに遅延広がりの増大により, それ以上の通信可能距離を達成することは極めて困難である. そこで本稿では, 無指向拡散反射方式において, 20[m]以上の送受信機間距離を達成できる方式として, 文献で提案した中継器を多段接続したシステムを提案し, これによる通信可能距離の改善効果について検討する.

A study on non-directed diffuse optical wireless communication system using muti-beam repeater

IMAMURA Kimihiko, NISHIDA Kaoru, MIYAMOTO Shinichi, TSUKAMOTO Katsutoshi, MORINAGA Norihiko

IEICE technical report. Antennas and propagation ( The Institute of Electronics, Information and Communication Engineers ) 96 ( 304 ) 33 - 40 1996.10

As an indoor wireless communication system, a non-directed diffuse optical wireless communication system has been taking a great attention. In this system, however, as the distance between the transmitter and the receiver increases, the power of received signal is rapidly decreased and then the conventional non-directed diffuse system cannot achieve a large coverage and a high speed transmission. In this paper, in order to obtain a enough received signal power for non-directed diffuse system, we propose a multi-beam and multi-detector repeater and discuss the performance improvement of non-directed diffuse system achieved by this proposed repeater. Numerical results conclude that, by using proposed repeater, the transmission speed and the coverage can be much improved compared to that of conventional non-directed diffuse optical system.

Modeling of Microwave Oven Interferences Using Class-A Impulsive Noise and Optimum Reception

KANEMOTO Hideki, MIYAMOTO Shinichi, MORINAGA Norihiko

IEICE technical report. Electromagnetic compatibility ( The Institute of Electronics, Information and Communication Engineers ) 96 ( 135 ) 15 - 22 1996.06

The performance of radio communication systems is much degraded by the effect of microwave oven interferences, and then in order to obtain a good error performance under microwave oven interference environment, the radio communication systems should be designed for microwave oven interference environment. In this paper, using the class-A impulsive radio noise model, we propose a statistical model of microwave oven interference and discuss the performance improvement achieved by an optimum reception. Numerical results conclude that the first order statistical characteristics of microwave oven interferences can be modeled as a class-A impulsive radio noise and their effects are decreased by using optimum reception.

4)マルチビーム拡散反射光無線通信システムの提案(無線・光伝送研究会)

西田薫, 宮本伸一, 塚本勝俊, 森永規彦, 増本好則, 武田孝明

テレビジョン学会誌 ( 一般社団法人映像情報メディア学会 ) 50 ( 3 ) 413 - 413 1996.03

Modeling of Microwave Oven Interferences using Class-A Impulsive Noise and Its Optimum Reception

KANEMOTO Hideki, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1996 ( 1 ) 534 - 534 1996.03

近年の無線通信システムのパーソナル化,ならびに,高周波デバイスを用いた電子機器の普及に伴い,電子機器等から発生する妨害波存在下において無線通信システムが使用される機会が多くなることが予想される.これらの妨害波はガウス雑音とは大きく異なった統計的性質を有するため,従来の無線通信システムでは誤り率特性が大きく劣化することが知られている.従って,妨害波存在下においても良好な誤り率特性を達成するためには,妨害波の統計的性質に基づくシステム設計を行う必要がある.そこで本研究では,高レベルな妨害波発生源として電子レンジを対象として,クラスAインバルス性雑音モデルを用いて妨害波の統計的性質を表す数学的モデル化を行い,その統計的性質に基づく最適受信を行うことによる誤り率特性改善効果について検討する.

A Proposal of Non-directional Diffused Optical Wireless Communication System

IMAMURA Kimihiko, MIYAMOTO Shinichi, TSUKAMOTO Katsutoshi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 537 - 537 1996

近年の情報機器の小型・携帯化に伴い,室内無線通信システムに対する需要が高まっている.中でも,光搬送波を用いる室内光無線通信システムは,潜在的広帯域性等の光信号の有する優れた特長を利用した方式として注目されている.室内光無線通信システムは,指向制御の有無および信号光の伝搬方法によりいくつかの方式に分類されるが,無線通信の特長であるシステム構成の柔軟性の面から考えると,無指向拡散方式が望ましいといえる.しかしながら,この方式では送受信機間距離が大きくなるに従い受信光電力が急激に低下するため,誤り率特性が大幅に劣化し情報伝送速度および通信可能距離が大きく制限される.そこで本稿では,送受信機間距離が離れた場合においても高い受信光電力が得られる無指向拡散方式として,中継器を用いた無指向拡散光通信システムを提案し,中継器を用いることによる伝送速度および通信可能距離の改善効果について検討する.

A proposal of non-directed diffuse optical wireless communication system using multi beam transmitter

NISHIDA Kaoru, MIYAMOTO Shinichi, TSUKAMOTO Katsutoshi, MASUMOTO Yoshinori, TAKEDA Takaaki, MORINAGA Norihiko

Technical report of IEICE. OCS ( The Institute of Electronics, Information and Communication Engineers ) 95 ( 342 ) 23 - 30 1995.10

As a communication system for indoor wireless local area networks, a non-directed diffuse optical communication system has taking a great attention. In this paper, as a non-directed diffuse optical communication system, the multi beam non-directed diffuse optical communication system, which has the non-directed multi beam transmitter, is proposed, and the performance of proposed system is investigated. At first, we propose a radiant eminence model for multi beam transmitter, and then, using this model, the performance of proposed system is evaluated. Moreover, we evaluate the effect of delay spread to the performance improvement is achieved by reducing the delay spread.

A Channel Assign of TDMA System under Periodic Interference Environment

TAMURA Shinji, HANAOKA Seishi, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1995 ( 1 ) 546 - 546 1995.03

高周波デバイスを使用したISM(Industrial,Scientific and Medical)機器の普及および無線通信システムのパーソナル化に伴い,ISM機器から発生する妨害波の影響による無線通信システムの受信特性劣化が予想され,これらの妨害波に対する対策が必要とされている.ISM機器から発生する妨害波は,電源周波数に関連して周期的に発生する場合が多く,このような周期性妨害波存在下でTDMA方式を用いた場合は,TDMA方式のフレーム構成によっては,妨害波発生周期とフレーム周期の同期的な関係により,特定のチャネルの誤り率特性が大きく劣化することが知られている.そこで本稿では,ISM機器から発生する周期性妨害波存在下でのTDMA方式のチャネル割当法として,妨害波の周期性を利用したチャネル割当法を提案し,提案割当法を用いることによる特性改善効果について評価する.

Incoherent Detection of Pointing Error for Optical Heterodyne Spatial Tracking System Using a Spatial Correlation between Signal and Local Lights

SOGAME S., KAWAMURA T., KURI T., TSUKAMOTO K., MIYAMOTO S., MORINAGA N.

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 1995 ( 1 ) 174 - 174 1995.03

非常に狭い光ビームが使用される衛星間光通信では,送信機のビーム指向精度に通信品質が大きく左右されるので,指向誤差を検出して相手側にアンテナを正しく指向させる空間追尾には非常に高精度が要求される。これまで筆者等は,従来の空間追尾方式のように4象限光検波器(4QD)を用いることなく,単一の光検波器と2つの局発光を用いて方位角・仰角方向の指向誤差を検出する光ヘテロダイン検波空間追尾方式を提案してきた,本報告では,本方式において光搬送波の位相雑音に対処するためIF段の非同期検波によって指向誤差を検出する構成を提案し,雑音等価角(NEA)について理論解析を行う.

Signal Transmission Characteristics of Non-directive Indoor Wireless Communication System Using Multi-beam Optical Diffuse Channel

NISHIDA Kaoru, IKEDA Yutaka, MIYAMOTO Shinichi, TSUKAMOTO Katsutoshi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers ) 2 490 - 490 1995

近年の情報機器のめざましい発達に伴い,室内無線LANに対する需要が急速に増加している.特に光信号を用いた室内光無線LANは,その潜在的広帯域性から,将来の大容量通信時代に対応できる方式として注目されている.しかし,現在までに提案されたシステムでは,送受信系が無指向性である場合には受信光電力の低下を招き,また一方,送信ビームに指向性をもたせた場合には,受信光電力は改善できるが,精細なアライメントが必要となるためシステムの柔軟性が制限される.そこで本稿では,システムのアライメントに対する柔軟性を維持しつつ,高い受信光電力が得られる室内光無線LANシステムとして,垂直方向へのビームの他に周辺方向へのビームを有する送信機を使用したマルチビーム拡散方式を提案し,その信号伝送特性の理論解析を行う.

Characteristics of Electromagnetic Disturbance from Microwave Ovens and Interference with Digital Radio Communications systems

Journal of Communications research Laboratory 42 ( 3 ) 211 - 223 1995

Design of TCM signals for class-A impulsive noise environment

Miyamoto Shinichi, Katayama Masaaki, Morinaga Norihiko

IEICE technical report. Electromagnetic compatibility ( The Institute of Electronics, Information and Communication Engineers ) 94 ( 229 ) 41 - 48 1994.09

In this paper,a design of TCM signals for Midleton′s class-A imp ulsive noise environment is investigated.At first,the error event characteristics under impulsive noise is investigated,and it is shown that,for the design of TCM signals under impulsive noise environment,the shortest error event path length is a more important measure than the squared Eucldean distance.Following this fact,we increase the states of convolutional codes and show that the great performance improvement is achieved by increasing the number of the states.Moreover,from the viewpoint of channel capacity,the required signal sets expansion rates to obtain the achievable coding gain is discussed.

Receiver Design Using the Dependence between Quadrature Components of Impulsive Radio Noise

MIYAMOTO Shinichi, KATAYAMA Masaaki, MORINAGA Norihiko

The Transactions of the Institute of Electronics,Information and Communication Engineers. B-(0xF9C2) ( The Institute of Electronics, Information and Communication Engineers ) 77 ( 2 ) 63 - 73 1994.02

ガウス雑音とは大きく異なった統計的性質を有するインパルス性雑音環境下においては,ガウス雑音下での使用を前提として設計された従来の受信機では十分な特性を得ることができず,インパルス性雑音の統計的性質に基づいた受信機設計を行う必要がある.そこで本論文では,インパルス性雑音の統計的性質について検討を行い,雑音の同相成分と直交成分の非独立性を利用して送信シンボルの判定を行う受信機を提案している.まず,インパルス性雑音の同相成分と直交成分の統計的性質について検討し,直交成分に高振幅の雑音(インパルス雑音)が生じている場合には,同相成分にもインパルス雑音が発生している確率が高くなることを示している.次に,この統計的性質を利用して送信シンボルの判定を行う受信機を新しく提案し,その受信機を用いることによって従来型受信機を大きく上回る最適に近い特性が得られることを明らかにしている.更に,雑音の同相成分と直交成分の非独立性が最ゆう判定を行う最適受信機の構成に与える影響について検討し,インパルス性雑音環境下において最適受信を行う場合は,BPSK方式などの搬送波に対する同相成分のみを用いて信号伝送を行う通信方式においても,直交成分に生じる雑音を観測する必要があることを明らかにしている.

Receiver Design of CDMA system for Class-A Impulsive Noise Environment

Hanaoka Seishi, Miyamoto Shinichi, Morinaga Norihiko

IEICE technical report. Electromagnetic compatibility ( The Institute of Electronics, Information and Communication Engineers ) 94 33 - 40 1994

In this paper,the performance of CDMA system under Class-A impulsive noise environment is investigated.At first,the performance characteristics of multiple access systems are discussed,and it is shown that the performance of CDMA system is expected to be better than those of other multiple access systems. Next,we evaluate the performance of conventional CDMA system designed for Gaussian noise and show that the performance of conventional CDMA system is much degraded by the effect of impulsive noise.Moreover,we propose the new receiver of CDMA system designed for Class-A impulsive noise.Numerical results conclude that the great performance improvement is achieved by using this proposed receiver.

Signal Detection Characteristics in Trellis Coded Modulation System under Impulsive Noise Environment and Its Optimum Reception

MIYAMOTO Shinichi, KATAYAMA Masaaki, MORINAGA Norihiko

The Transactions of the Institute of Electronics,Information and Communication Engineers. B-(0xF9C2) ( 電子情報通信学会 ) 75 ( 10 ) 671 - 681 1992.10

インパルス性雑音環境下におけるトレリス符号化変調方式に関する研究

宮本伸一

信学技報 RCS90 - 5 1990

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