针对并行干扰消除(PIC)算法检测过程容易出现判决误差扩散导致移动通信系统整体性能下降的问题,结合数值分析中的Schwarz算法,对强多址干扰情况下直接序列扩频码分多址(DS-CDMA)系统中的并行干扰消除(PIC)算法进行了研究.提出了一种异步连续并行Schwarz-PIC算法.新算法通过Schwarz算法实现对信道用户信息数值子域边值的精确控制,全面跟踪时变信道;且能有效避免判决误差的扩散,抑制MAI及ISI的影响.在收敛性、动态跟踪能力及算法精度方面较原有PIC算法有较大提高.仿真结果验证了新算法的有效性.
The problem as judgment error diffusion in the testing process for PIC algorithm of the Direct Se- quence Spread Spectrum Code Division Multiple Access (DS-CDMA) system is studied under the condition with strong multiple access interference (MAI). An asynchronous continuous parallel Schwarz-PlC algorithm is pro- posed. The new algorithm can track the time-varying channel, avoid decision error diffusion and restrain the influ- ence of MAI effectively by the channel user information value sub-domain boundary value precise control of Schwarz algorithm. Simulation results showed that the new algorithm has better convergence, dynamic tracking ability and precision than the original PIC algorithm.