论文部分内容阅读
提出一种基于高阶累积量的回波对消新方法，以期在信噪比较低的情况下，优于基于自适应滤波技术的回波对消方案．该方法的实质是高阶累积量能够自动抑制高斯有色或白色噪声，先用回波数据来计算其４阶累积量，再利用部分累积量估计回波通路的滤波器系数，最后利用可能得到的全部累积量来对滤波器系数进行细估计．在信噪比分别为２０、１５、１０、５ｄＢ的条件下，各进行１０次随机试验，仿真结果显示：在不高于１５ｄＢ的低信噪比情况下，其滤波器系数的估计精度和回波对消量远比横向滤波器结构的ＬＭＳ算法高
A new echo cancellation method based on higher-order cumulants is proposed, which is better than the echo cancellation scheme based on adaptive filtering when SNR is low. The essence of this method is that high-order cumulants can suppress Gaussian colored or white noise automatically, calculate the fourth-order cumulant using the echo data first, and then use the partial cumulant to estimate the filter coefficients of the echo path. Finally, The total amount of the filter to make a careful estimate of the coefficients. Under the condition of signal-to-noise ratios of 20, 15, 10 and 5 dB respectively, 10 random experiments were carried out respectively. The simulation results show that the accuracy and accuracy of the filter coefficients at low signal-to-noise ratio The wave cancellation is much higher than the LMS algorithm of the transversal filter structure