Performance for a Space-time Coded DS-CDMA system with arrival time difference in a Rayleigh fading channel

도착시간차가 존재하는 레일레이 폐이딩 채널에서 시공간부호화된 DS-CDMA 시스템의 성능

In this paper, the natural space-time coding is applied for a DS-CDMA system with multiple transmit/receive antennas in a Rayleigh fading channel. With difference of arrival times from transmit antennas a modified maximum likelihood (ML) decoding algorithm is proposed for the space-time coded DS-CDMA system. The proposed decoding algorithm performs ML decoding over the transition of two consecutive branches by using a modified branch metric with the partial autocorrelation. By simulation, it is shown that the proposed decoding algorithm achieves significant performance improvement over the ML decoding algorithm without the modified branch metric.