Misc - MIYAMOTO Shinichi

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

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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

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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

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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

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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

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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

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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