TD-SCDMA上行失步条件下一种改进的多用户检测算法

针对TD-SCDMA上行失步及强多址干扰的情况，设计了一种二级信道估计算法以及基于该信道估计算法的解相关干扰消除多用户检测算法。二级信道估计算法可以得到各接入用户主径的幅度以及时延，多用户检测算法根据信道估计的结果对接收数据进行解相关检测以及干扰消除。仿真结果表明，上行失步和强多址干扰情况下，该改进算法的误码率性能较传统的匹配滤波、联合检测以及解相关算法有较大的提升。

Improved multi-user detection algorithm in uplink out-of synchronous TD-SCDMA systems

This paper presented a two-stage channel estimation algorithm and a related decorrelation interference cancellation multi-user detection algorithm in uplink out-of synchronous TD-SCDMA systems with strong MAI. It consisted of two parts. The first part which estimated the channel path attenuation and transmission delay was two-stage channel estimation, followed by the second part, which performed decorrelation and interference cancellation based on the result of two-stage channel estimation. Simulation results of out-of synchronous scenario with strong MAI demonstrate that the proposed algorithm exhibits better performance than conventional detector such as marched filter, joint detection and decorrelation algorithm.