針對多個不等強度的大功率窄帶干擾，提出了一種權值反饋的頻域自適應濾波算法。其優(yōu)點是利用權值反饋不僅在權值迭代過程中實時調(diào)整更新步長，實現(xiàn)算法的快速收斂，同時達到有效地抑制多個強干擾的目的，使輸出信號的平均功率更接近于擴頻信號功率，改善了DSSS系統(tǒng)的性能。同時將算法的數(shù)學推導和分析與無權值反饋自適應濾波算法進行了比較，仿真結果驗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 鍵 詞 權值反饋; 窄帶干擾抑制; 自適應濾波; 擴頻通信

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