面向电力线通信系统抗脉冲噪声的定时同步算法

The Timing Synchronization Algorithm for Impulse Noise for Power Line Communication System

针对电力线通信系统中脉冲噪声造成系统定时同步不准确的问题,提出了一种能够抵抗脉冲噪声且具有简化定时同步计算的方案,该算法在延时自相关阶段利用发送端前导信号峰均比与接收信号的峰均比关系对延时自相关滑动窗设定滑动阈值过滤掉脉冲噪声,增强同步算法抗噪声能力。此外,在判定数据起始位置的基础上通过缩小互相关算法的滑动范围,简化了同步过程的相关运算。仿真表明改进的算法能够提高定时同步算法抵抗脉冲噪声的能力,提高系统定时同步的正确率。

In view of the inaccurate timing synchronization caused by impulse noise in the power line communication system,this paper proposes a scheme that can resist impulse noise and has a simplified timing synchronization calculation.The algorithm uses the relationship between the peak mean ratio of the transmitter preamble signal and the peak to peak ratio of the received signal to the delay autocorrelation in the time delay autocorrelation.The window set a sliding threshold to filter out impulse noise and enhance the anti noise ability of the synchronization algorithm.In addition,on the basis of judging the starting position of data,by reducing the sliding range of cross-correlation algorithm,the related operations of the synchronization process are simplified.Simulation results show that the improved algorithm can improve the ability of timing synchronization algorithm to resist impulse noise and improve the accuracy of timing synchronization.