一种新的干扰抑制频域自适应算法

A Novel Frequency-domain Adaptive Algorithm for Suppression of Interference

针对权值泄露自适应算法对功率时变干扰鲁棒性差的问题,在深入研究步长因子μ,泄露因子α与干扰抑制因子B关系的基础上,提出一种新的变步长频域抑制窄带干扰自适应算法。推导了新算法对功率时变干扰抑制性能,结合GPS抗干扰分析了新算法的收敛性能。新算法根据干扰功率自适应地调整干扰抑制因子B,提高了算法对时变干扰的鲁棒性,在干扰功率变化情况下能有效地抑制干扰。计算机仿真的结果证明了算法的有效性。

The aim of this paper is to the problem that the weight leakage algorithm did not work well when the power of interference changed,in order to overcome the shortcoming of constant step size frequency-domain adaptive algorithm.Based on studying the relation between step factorμ,leak factorαof weight leakage adaptive filtering,and the interference suppression factor B,a novel variable step size frequency-domain adaptive filtering arithmetic was prepared.The performance of the novel algorithm suppressing power time-varying interference is derived,and the convergence performance is analyzed in the GPS suppressing interference scenarios.This novel arithmetic is superior to constant step arithmetic in environment that power of interference changes,the interference can be still suppressed effectively when it＇s power Changes by using this algorithm.The computer simulation results confirm the theoretical analysis and show the algorithm performance is better than that of former algorithms.