异步DS-CDMA系统的等效同步多用户检测算法

第三代移动通信系统中，多用户检测技术是克服多址干扰(MAI)、增加系统容量的有效方法。本文针对多径衰落信道下的直扩码分多址(DS—CDMA)系统的上行链路，基于等效扩频码组Gram—Schmitz正交化与串行干扰消除(SIC)，提出了等效同步多用户检测(ESMUD)算法。分析最大比合并瑞克(RAKE)接收算法、传统的SIC算法以及本文算法的复杂度，并对三种算法的性能进行数值仿真。结果表明，本文提出的算法能有效抑制MAI，且计算复杂度与传统SIC算法在同一量级上。

Equivalent Synchronous Multi-User Detection Algorithm for Asynchronous DS-CDMA Systems

An algorithm named equivalent synchronous multi-user detection (ESMUD) is proposed for the direct-sequence code-division multiple access (DS-CDMA) systems over fading multi-path channels. The proposed algorithm is based on the Gram-Schmitz orthonormalization of equivalent spread-spectrum codes and the successive interference cancellation (SIC). Base on the analysis on the computational complexity corresponding to different algorithms such as RAKE, conventional SIC and ESMUD, performances of these algorithms are compared through simulations. The results show that ESMUD algorithm has excellent performance to resist MAI, while the complexity is of the same order as conventional SIC algorithm.