一种抗脉冲噪声的电力线通信系统定时同步方法

摘要

针对电力线通信系统中的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能简化定时同步计算的算法,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的关系对延时自相关滑动窗设定滑动阈值过滤掉脉冲噪声,增强了同步算法抗噪声能力;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,进一步提高系统定时同步的正确率.%For the problem of system timing synchronization inaccuracy caused by impulsive noise in power line communication systems,a scheme is proposed that can resist impulsive noise and has a simplified timing synchronization.In the delay autocorre-lation stage,the sliding threshold of the delay autocorrelation sliding window is setted by using the relationship between the peak to average ratio of the preamble in the transmitter and the peak to average ratio of the received signal,and the impulse noise is fil-tered out.The resist noise ability of synchronization algorithm is enhanced.In addition,the relative operation amount of the syn-chronization process is simplified by reducing the sliding range of cross-correlation algorithm based on the determined starting po-sition of the data.Simulation results show that the improved algorithm can improve the ability of timing synchronization to resist impulsive noise,and further improve the accuracy of timing synchronization.