새로운 LCZ 수열군을 이용한 준동기 부호분할 다원접속 시스템의 성능분석
Performance Analysis of Quasi-Synchronous Code Division Multiple Access Systems Using New Set of LCZ Sequences
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초록
본 논문에서는 준동기(quast-synchronous) 부호분할다원접속(code division multiple access) 시스템에 최적화된 수열군인 낮은 상관구역(LSZ: Low Correlation Zone)을 갖는 수열군을 소개한다. 그리고 가우스 근사법을 이용하여 Long 등이 유도한 준동기 부호분할다원접속 시스템의 비트오율의 근사식을 소개한다. 다음으로 이진 확장수열을 이용하여 만든 낮은 상관구역을 갖는 새로운 4진 LSZ 수열군의 생성법을 제안하고, 컴퓨터 모의실험을 통해 비동기 부호분할다원접속 시스템에 최적화된 기존의 수열군들과 새로 제안된 수열군의 준동기 부호분할다원접속 시스템의 성능을 비교하였다.
Abstract
In this paper, we introduce the quaternary low correlation zone (LCZ) sequence set which is optimized forquasi-synchronous code division multiple access (QS-CDMA) system. We also introduce the approximation of bit error rate (BER) for QS-CDMA system derived by Long, Zhang, and Hu. We propose the new construction method of quaternary LSZ sequence set using binary extended sequence with shorter period and compare the performance of QS-CDMA system using optimal sequence set with respect to Welch bound with that oh using new LSZ sequence set by computer simmulation.
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