码分多址系统中基于判决引导的窄带干扰抑制非线性算法

鉴于扩展频谱码分多址（CDMA）系统中抑制窄带干扰的渐近条件均值（ACM）非线性滤波算法计算复杂度较高，设计了一种基于判决引导的新非线性滤波算法。该算法利用窄带干扰的相关性，在对扩频信号判决的基础上进行ACM非线性滤波。对扩频信号可能的取值，进行判决的标准是窄带干扰先验估计和后验估计的差方最小。将本文方法与ACM算法进行比较，仿真结果显示了几乎相同的性能，但前者计算复杂度显著降低。

Decision-Directed Based Nonlinear Algorithm for Narrowband Interference Suppression in CDMA Systems

Whereas the approximate conditional mean (ACM) nonlinear filtering algorithm for suppressing narrowband interference in CDMA spread spectrum systems has high computation complexity, this paper proposed a decision-directed based new nonlinear filtering algorithm which utilizes the dependence of narrowband interference, performs ACM nonlinear filtering based on the estimate of spread spectrum signal. For the values which the spread spectrum signal may be, the decision rule is the smallest square of the difference between the posteriori estimate and priori estimate of the narrowband interference. The simulation results show that the proposed algorithm achieves almost the same performance as the ACM algorithm, but possesses much less computation complexity.