基于变步长匹配追踪的G3-PLC系统信道估计算法  

Channel Estimation Algorithm for G3-PLC Systems Based on Variable Step Size Matching Pursuit

作　　者：吴铭 沈瑞强 袁三男 WU Ming;SHEN Ruiqiang;YUAN Sannan(School of Electronic and Information Engineering,Shanghai Electric Power University,Yangpu District,Shanghai 201306,China;Jiangsu Linyang Energy Co.,Ltd.,Nantong 226200,Jiangsu Province,China)

机构地区：[1]上海电力大学电子与信息工程学院,上海市杨浦区201306 [2]江苏林洋能源股份有限公司,江苏省南通市226200

出　　处：《电力信息与通信技术》2024年第7期82-87,共6页Electric Power Information and Communication Technology

摘　　要：为合理利用电力线信道的稀疏特性,提高G3-PLC系统通信的可靠性,基于压缩感知(compressed sensing,CS)理论,提出一种稀疏度自适应的变步长前向后向匹配追踪(sparsity adaptive variable step size forward-backward pursuit,SA-VSSFBP)算法。该算法在前向后向匹配追踪算法(forward-backward pursuit,FBP)的基础上引入变步长自适应的思想,于迭代初期选择大步长以减小迭代次数,迭代后期使用小步长获得精确估计。同时利用原子匹配度测试进行稀疏度预估计,确保逼近真实稀疏度的前提下,加快迭代速度,减少算法运行的时间。仿真实验结果表明,对比传统的信道估计方式,压缩感知信道估计方式具有更优越的性能,且相较于正交匹配追踪算法(orthogonal matching pursuit,OMP)与FBP的压缩感知信道估计算法,文章提出的算法能够在保证精度与步长为1的FBP相当的情况下算法效率分别能够提升24.14%和47.2%。In order to leverage the sparse characteristics of power line communication channel and improve the reliability of G3-PLC system communication,this paper proposes a sparsity adaptive variable step size forward-backward pursuit(SA-VSSFBP)algorithm based on the theory of compressed sensing(CS).This algorithm builds upon the forward-backward pursuit(FBP)algorithm and introduces the concept of variable step size with adaptivity.It employs a large step size in the initial iterations to reduce the number of iterations,and a small step size in the later iterations to obtain accurate estimates.Additionally,the atomic matching test is utilized for sparsity pre-estimation to ensure the approximation of the real sparsity,speed up the iteration speed and reduce the running time of the algorithm.The simulation results show that:compared with the traditional channel estimation method,the compressed sensing channel estimation method has superior performance;and compared with the orthogonal matching pursuit(OMP)and FBP compressed sensing channel estimation algorithms,the algorithm proposed in this paper is able to improve 24.14%and 47.2%of the efficiency of the algorithm in the case of guaranteeing that the accuracy is comparable to that of the FBP with the step size of 1.

关 键 词：G3-PLC OFDM 电力线信道 变步长 前向后向追踪 

分 类 号：TM73[电气工程—电力系统及自动化]