自适应滤波去噪方法研究

Research on Method to De-noise Based on Adaptive Filter

为了消除无线电接收回波中的背景噪声,基于LMS自适应滤波器及其算法,对影响LMS算法收敛速度的迭代因子μ进行了分析;通过推导,给出了μ的取值范围,并对自适应滤波器的去噪效果进行了计算机仿真。仿真结果表明,自适应噪声对消器可以改善系统的输出信噪比,对宽带噪声有明显的抑制作用。

To eliminate background noises of radio echo, LMS adaptive filter and its arithmetic are researched. The μ gene which affects the convergence speed of LMS arithmetic is also analyzed. Through deducing, the value range of μ is given. The de-noise effect of adaptive filter is emulated through computer. According to emulation result, the technique of adaptive noise canceling can improve systematic output SNR （signal to noise ratio） , and there is obvious inhibition on the broadband noise.