Faculty Profiles - MIYAMOTO Shinichi

Misc - MIYAMOTO Shinichi

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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

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