一种脉冲噪声下的鲁棒性自适应回波抵消方法

摘要

Impulsive noise exists in communication lines, making the performance of tradition-al adaptive echo cancellation based on Gaussian distribution poor. To solve the problem, this pa per presents a robust adaptive echo cancellation method, RAEC, which is based on the Alpha sta ble distribution. Under the least mean p-norm criterion, echo is cancelled by using an adaptive time delay estimator. This method can effectively offset echo in communication lines not only in the presence of Gaussian noises, but also in the presence of impulse noises. Theoretical analysis and computer simulation show that RAEC is a robust adaptive echo cancellation method for im pulse noise.%实际通信线路中脉冲性噪声常使得基于高斯噪声模型的经典自适应回波抵消方法的效果变差。针对该问题，提出了一种基于α稳定分布模型的鲁棒性自适应回波抵消方法（RAEC）。该方法采用p稳定分布建模脉冲噪声，在最小平均p范数准则下，利用自适应时间延迟估计器来抵消回波，不仅可以有效地抵消通信线路中含有高斯噪声的回波，而且对含有脉冲噪声的回波也有良好的抵消效果。理论分析和计算机仿真实验表明，RAEC是一种对脉冲噪声具有鲁棒性的自适应回波抵消方法。