说明：  对基于LMS(最小均方)、NLMS（归一化最小均方）、RLS（递归最小二乘）算法的自适应噪声抵消系统进行MATLAB仿真，发现这几种算法都能从高背景噪声中有效地抑制干扰提取出有用信号，显示出了良好的的收敛性能，相比之下RLS算法去噪效果较好，呈现出更快的收敛速度，更强的稳定性和抑噪能力
(the principle of LMS (minimum mean square), NLMS (normalized least mean square), RLS (recursive least squares) It is found that these algorithms can effectively suppress the interference from the high background noise and show the good convergence performance.)