Misc - MIYAMOTO Shinichi

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

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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

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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

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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

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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

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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

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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

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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.