权值反馈的多干扰频域自适应滤波

针对多个不等强度的大功率窄带干扰，提出了一种权值反馈的频域自适应滤波算法。其优点是利用权值反馈不仅在权值迭代过程中实时调整更新步长，实现算法的快速收敛，同时达到有效地抑制多个强干扰的目的，使输出信号的平均功率更接近于扩频信号功率，改善了DSSS系统的性能。同时将算法的数学推导和分析与无权值反馈自适应滤波算法进行了比较，仿真结果验证了该算法在加快收敛速度以及改善系统性能方面的有效性。
关 键 词 权值反馈; 窄带干扰抑制; 自适应滤波; 扩频通信

Abstract A weight-feedback frequency domain adaptive filtering algorithm is proposed in this paper to suppress multi-narrowband interference. Using feedback weight adjusts timely the step during iterating procedure, fastens convergence rate of frequency adaptive filtering. Similarly this method can also achieve the purpose of suppressing interference and improving the performance of DSSS system. Compared with non-feedback frequency adaptive filtering, Mathematical derivation and computer simulation results are presented to validity of the proposed algorithm.
Key words weight feedback; multi-narrowband interference suppression; adaptive filtering; spread spectrum