干扰消除是无线光码分多址(CDMA)通信系统中的一项关键技术。分析了基于递归最小二乘(RLS)算法的盲多用户检测算法的原理及性能,并将其应用于采用光正交码的无线光CDMA系统中。讨论了该系统中遗忘因子的选取原则及其对算法的收敛性和系统误码率性能的影响。为了克服固定遗忘因子所带来的矛盾,提出了一种改进的变遗忘因子RLS盲多用户检测算法,并对遗忘因子进行了修正。结果表明,采用改进的方法后系统能获得较快的收敛速度和跟踪速度,收敛时的估计误差也较小,而且信号干扰比由传统算法的6dB提高到9dB。说明采用变遗忘因子的RLS算法不仅适合于采用光正交码的无线光CDMA系统,而且跟踪期望用户信号的性能良好。 Interference cancellation is a key technology in wireless optical code division multiple access (CDMA) communication systems. The principle and performance of blind multiuser detection algorithm based on Recursive Least Squares (RLS) algorithm are analyzed and applied to wireless optical CDMA systems using optical orthogonal codes. The selection principle of the forgetting factor in the system and its influence on the convergence of the algorithm and the performance of the system bit error rate are discussed. In order to overcome the contradiction caused by the fixed forgetting factor, an improved RLS blind multiuser detection algorithm is proposed, and the forgetting factor is modified. The results show that the system can obtain faster convergence rate and tracking speed with the improved method, and the estimation error in convergence is also smaller, and the signal interference ratio is improved from 6dB to 9dB by the traditional algorithm. It shows that the RLS algorithm with variable forgetting factor is not only suitable for wireless optical CDMA systems using optical orthogonal codes, but also tracking the performance of expected user signals.