一种改进的WCDMA系统多用户检测恒模算法

摘要

对于直接序列码分多址(DS-CDMA)系统来说,恒模算法(CMA)是一种非常受欢迎的盲自适应多用户检测(MUD)算法.然而,在宽带码分多址(WCDMA)系统中,由于循环平稳干扰的周期不再等于扩频因子,所以需要适当修改接收滤波器的系数更新方程,以便于运用恒模算法.笔者提出了一种适合于WCDMA系统的改进恒模算法(ICMA),给出了修正了的接收滤波器的系数更新方程.仿真结果表明,与传统恒模算法(CCMA)相比,ICMA具有更优的误比特率(BER)性能.%Constant modulus algorithm (CMA) is a popular blind adaptive multi-user detection algorithm in the direct sequence code division multiple access (DS-CDMA) systems. In a wideband CDMA (WCDMA) system, however, an appropriate modification to the coefficient update equation of the receiver filter is necessary for the reason that the period of cyclo-stationary interference is no longer equal to the spreading factor. In this paper, an improved CMA (ICMA) for WCDMA is presented and its modified coefficient update equation of the receiver filter is evaluated. The simulation results show that ICMA has better performance than the conventional CMA (CCMA) in terms of transmission bit error rate (BER).