一种TD-SCDMA系统线性多用户检测的算法

The Design and Analysis of a Linear Multi-user Detection Algorithm for TD-SCDMA

依据"时分同步码分多址(TD-SCDMA)"协议标准文本,针对TD-SCDMA系统在多径瑞利衰落信道下的多用户检测问题,提出了一种基于最小均方误差准则的次优线性多用户检测问题数学模型,并基于该模型利用组合数学中的最速梯度下降法,设计实现了一种适用于TD-SCDMA系统的LMMSE MUD算法,同时结合仿真实验结果得出影响该算法收敛性能的关键因素,该算法复杂度分析。结果表明,此算法BER性能优于SUMF和ZF-BLE,而其算法复杂度与ZF-BLE法相当。

In order to solve the multi-user detection problem of multi-path Rayleigh short-term faded channels in TD-SCDMA, this paper based on the protocol of ＂Technical Specification of IMT-2000 CDMA TDD （TD-SCDMA）＂, firstly presented a math model for TD-SCDMA system＇s Joint Detector, then based on this model, it designed ＆ implemented a suboptimal linear MMSE MUD algorithm for TD-SCDMA by using the Steepest Descent Algorithm in computational combinatorics, finally it discussed the key variables which could influence the convergence of this algorithm and given out the algorithm＇s complexity analysis. The result showed that our algorithm＇s BER performance＇ s better than the one of SUMF and ZF-BLE,but the complexity of our algorithm＇s fairly equal to that of ZF-BLE.