Misc - MIYAMOTO Shinichi

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

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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

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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

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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