电力线通信系统中的脉冲干扰抑制研究

Research on Impulsive Interference Suppression in Power-Line Communication System

提出了一种基于最大似然(ML)准则的脉冲干扰抑制方法。该方法是在接收端根据接收信号的循环平稳特性,首先估计出信号功率及噪声加脉冲干扰功率,然后将估计出的值应用于门限值的计算中,实时地更新门限值,因此能够更准确地去除脉冲干扰。最后通过计算机的仿真结果表明,本文的方法相较于固定的门限值滤除方法具有更低的误比特率。

A novel impulse interference suppression method based on maximum likelihood （ML） criterion was proposed in this paper. Based on the cyclostationarity of the received signal at the receiver, the signal power and the noise plus interference power are firstly estimated, Then, these estimated power values are applied to calculate the threshold value and the threshold is updated in real time to precisely eliminate impulse interference. Simulation results demonstrate that the proposed method has lower bit error rate compare with traditional method with fixed threshold value.