威德罗(Widrow)提出的LMS算法自适应噪声抵消系统中,由于d(j)=s(j)+n_0,带有随机噪声n_0,不再是一个理想的期望响应。这时自适应滤波器除了有由于LMS近似算法造成的权失调外,还有随机噪声的影响。本文讨论了这种随机噪声对系统性能的影响,以及如何选择系统的加权数目n,收敛因子μ这两个主要参数,使系统性能达到最佳。最后,对得出的结论进行了实验验证。 In LMS adaptive noise cancellation system proposed by Widrow, since d (j) = s (j) + n_0, with random noise n_0, it is no longer an ideal expected response. In this case, besides adaptive loss due to the LMS approximation algorithm, the adaptive filter has the effect of random noise. This paper discusses the effect of such random noise on the system performance, and how to choose the system’s weight n, the convergence factor μ the two main parameters, the system performance to achieve the best. Finally, the conclusion drawn is verified experimentally.