基于变步长独立分量分析的干扰抑制算法

An Interference Cancellation Algorithm Based on Adaptive Step Size Independent Component Analysis

多址干扰和人为干扰是CDMA体制的军事移动通信所存在的两大主要干扰。将变步长独立分量分析方法运用于设计CDMA系统的抗干扰接收机,提出了一种综合抗干扰算法。变步长独立分量分析方法能同时满足收敛速度快和稳态误差小的要求,只需要期望用户的扩频码,而无需其他更多的信息。通过仿真实验表明,提出的算法误码性能较好,同时得到了较快的收敛速度和较好的稳态误差,是一种适合CDMA移动通信系统下行链路的综合抗干扰技术。

The Multiple Access Interference （MAI） and jamming are two main interferences in the military CDMA mobile communication system.The adaptive step size independent component analysis （ICA） method is used in design of the anti-interference receiver in CDMA system, and an interference cancellation algorithm is presented in this paper. Adaptive Step Size ICA algorithm can meet the requirements of fast convergence speed and small Steady-state error. This algorithm only needs the spread code of the interesting user without any other information. Simulation results also show that this algorithm has a great improvement in the suppression of the MAI and jamming and is a comprehensive anti-interference technology for the CDMA downlink.