權(quán)值反饋的多干擾頻域自適應(yīng)濾波

針對多個不等強(qiáng)度的大功率窄帶干擾，提出了一種權(quán)值反饋的頻域自適應(yīng)濾波算法。其優(yōu)點(diǎn)是利用權(quán)值反饋不僅在權(quán)值迭代過程中實(shí)時調(diào)整更新步長，實(shí)現(xiàn)算法的快速收斂，同時達(dá)到有效地抑制多個強(qiáng)干擾的目的，使輸出信號的平均功率更接近于擴(kuò)頻信號功率，改善了DSSS系統(tǒng)的性能。同時將算法的數(shù)學(xué)推導(dǎo)和分析與無權(quán)值反饋?zhàn)赃m應(yīng)濾波算法進(jìn)行了比較，仿真結(jié)果驗(yàn)證了該算法在加快收斂速度以及改善系統(tǒng)性能方面的有效性。
關(guān) 鍵 詞 權(quán)值反饋; 窄帶干擾抑制; 自適應(yīng)濾波; 擴(kuò)頻通信

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