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[특집/디지탈 통신기술] Performance Analysis of Frequency-Hop Spread-Spectrum Multiple-Access Networks
전경훈(Kyungwhoon Cheun) 대한전자공학회 1992 텔레콤 Vol.8 No.2
This paper is intended as an overview of some current results on the performance analysis of Frequency-Hop Spread-Spectrum Multiple-Access networks(FHSS-MA.) Naturally, the emphasis will be on the results of the author's research in this area. Some of the results presented are pre-viously published results and some are prelimi-nary results currently under investigation. The topics covered in this paper are (i) error perfor-mance analysis of FHSS-MA networks. (ii) opti-mization of the code-rate and the number of frequency hopping slots in FHSS-MA networks and the (iii)optimization of capture probability in Spread-Spectrum (SS) MA networks. For each of the above. possible extentisons and future research topics are suggested.<br/>
Rate-2인 2×2 시공간 부호를 위한 효율적인 복호 알고리즘
김정창(Jeongchang Kim),전경훈(Kyungwhoon Cheun) 대한전자공학회 2009 電子工學會論文誌-TC (Telecommunications) Vol.46 No.3
최근에 간단한 ML 복호가 가능한 rate-2, 2×2 시공간 부호가 개발되었다. 비록 이러한 간단한 ML 복호 알고리즘이 ML 복호 복잡도를 줄여 주지만 여전히 향상될 여지가 남아 있다. 본 논문에서는 간섭제거 방법을 사용하여 ML 복호와 거의 동일한 성능을 가지면서 rate-2, 2×2 시공간 부호를 위한 효율적인 복호 알고리즘을 제안한다. 제안된 알고리즘의 복호 복잡도는 기존의 간단한 ML 복호에 비해서도 더욱 감소하며 변조 차수가 클수록 복호 복잡도 감소율은 더욱 증가한다. Recently, a rate-2, 2×2 space-time code with simple ML decoding has been designed. Though the simple ML decoding algorithm does reduce the ML decoding complexity, there is still need for improvement. In this paper, we propose an efficient decoding algorithm for the rate-2, 2×2 space-time code using interference cancellation techniques with performance virtually identical to that of ML decoding. Also, the decoding complexity of the proposed algorithm is significantly reduced compared to the conventional simple ML decoding, especially for large modulation orders.