Faculty Profiles - MIYAMOTO Shinichi

Misc - MIYAMOTO Shinichi

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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

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