Performance of multiuser CDMA system with space-time block coding in MIMO Rayleigh fading channels

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YU XiangBin DONG Tao BI GuangGuo College of Information Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing China School of Information Science and Technology Sun Yatsen University Guangzhou China National Mobile Communications Research Laboratory Southeast University Nanjing China [1 ,3 ,2 ,3 ,1 ,210016 ,2 ,510275 ,3 ,210096 ]
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Science in China(Series F:Information Sciences) | 2009年 / 52卷 / 12期
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摘要：
In this paper, by introducing orthogonal space-time coding scheme, the multiuser CDMA systems with different space time codes are given, and corresponding system performance is investigated over Rayleigh fading channel. A low-complexity multiuser receiver scheme is developed for space-time coded CDMA systems. The scheme can make full use of the complex orthogonality of space-time coding to simplify the high decoding complexity of the existing scheme. Compared to the existing scheme with exponential decoding complexity, it has linear decoding complexity. Based on the performance analysis and mathematical calculation, average bit error rate (BER) of the system is derived in detail, and tight closed-form approximation expressions of BER are attained. Simulation results on average BER are in agreement with the theory analysis. The results show that the proposed scheme can achieve almost the same performance as the existing scheme. Moreover, on the condition of same system throughput and concatenation of channel code, the given full-rate space-time coded CDMA system has lower BER than the full-diversity space-time coded CDMA systems.
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页数：12
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