基于MIMO电力线信道的定时同步算法  

Timing Synchronization Method in MIMO Power Line Channel Communications

作　　者：申敏[1,2] 毛文俊 袁一铭[1,2] 李心安 SHEN Min;MAO Wen-jun;YUAN Yi-ming;LI Xin-an(School of Communications and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Key Lab of New Generation Broadband Mobile Communication Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]重庆邮电大学新一代宽带移动通信重点实验室,重庆400065

出　　处：《光通信研究》2022年第2期18-21,34,共5页Study on Optical Communications

基　　金：国家科技重大专项资助项目(2018ZX03001026-002)。

摘　　要：针对多输入多输出(MIMO)电力线通信(PLC)系统中的脉冲噪声造成定时同步不准确的问题,文章提出了一种基于MIMO PLC系统的正交频分复用(OFDM)符号定时同步算法,利用差分相关和最大比合并(MRC)提高同步性能。在2×2 MIMO PLC信道模型下,两个发送端口发送自相关性和互相关性良好的前导序列,在接收端通过设置阈值过滤电力线中的脉冲噪声,采用改进的延时自相关算法实现定时粗同步。利用窗口求和方法减小精同步的估计范围后,通过差分相关和MRC联合算法完成定时精同步。相比互相关算法,所提算法有2 dB的提升。仿真结果表明,该方法同步性能明显优于传统互相关算法。For the problem of system timing synchronization inaccuracy caused by impulsive noise in Multiple-Input Multiple-Output(MIMO)Power Line Communication(PLC),an Orthogonal Frequency Division Multiplexing(OFDM)symbol timing synchronization algorithm based on MIMO PLC system is proposed in this paper,which uses differential correlation and Maximum Ratio Combining(MRC)to improve the synchronization performance.Under 2×2 MIMO PLC channel model,the two transmitting ports send preamble sequences with good autocorrelation and cross-correlation characteristics.At the receiving end,the impulse noise in the power line is filtered by setting the threshold,and the timing coarse synchronization is realized by using the improved delay autocorrelation algorithm.Next,the window summation method is used to reduce the estimation range of fine synchronization.Then,a combined differential correlation and MRC algorithm is used in the timing fine synchronization stage,which has 2 dB improvement compared with the previous method.The simulation shows that the synchronization performance of the proposed method is obviously superior to the traditional cross-correlation method.

关 键 词：多输入多输出 电力线通信 定时同步 差分相关 

分 类 号：TN913.6[电子电信—通信与信息系统]