移动终端基于动量因子的变步长盲多用户检测算法

Blind multiuser detection algorithms are used to eliminate the Multiple Access Interference (MAI) and the Near-Far effect.Three kinds of blind multiuser detection algorithms based on CDMA communication system are studied in this paper. Those are the Least Mean Squares (LMS) algorithm, Recursive Least Squares (RLS) algorithm, Kalman filter algorithm. The performance of the signal to interference ratio and the EOE of three kinds of multi-user detection algorithm have been discussed in this paper. The new changeable step algorithm based on momentum factor is proposed. The algorithm has better convergence performance by applying the method that uses a larger step value in initial moment while dynamically adjusting step in iteration phases according to error of detector\'s output for the same received symbol in two adjacent iteration processes.Simulation results show that the new changeable step based on momentum factor algorithm outperforms LMS algorithm and RLS algorithm. The Multiple Access Interference and Near-Far effect can be eliminated effectively. Kalman filter algorithm has faster convergence speed, more practical and the capability of CDMA system can be inceased.