一种抗脉冲噪声的宽带电力线通信系统信道估计算法  

A channel estimation algorithm for impulse noise suppression in WB-PLC system

作　　者：郑建宏[1] 邓湛 ZHENG Jianhong;DENG Zhan(Engineering Research Center of Mobile Communications of Ministry of Education, Chongqing University of Posts and Telecommunications, Chongqing 400065, P. R. China)

机构地区：[1]重庆邮电大学移动通信教育部工程研究中心,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2019年第1期44-49,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家03重大专项(2016ZX03002010-003)~~

摘　　要：基于正交频分复用(orthogonal frequency division multiplexing,OFDM)的宽带电力线通信(power line communication,PLC)系统中信道估计受到了脉冲噪声的严重影响。针对该问题提出了一种确定脉冲噪声出现位置的方法,对其进行"置零"处理。该时域非线性处理虽然消除了脉冲噪声的影响,但引入了子载波间干扰(inter carrier interference,ICI),造成信道估计性能的损失,利用PLC系统中的前导结构设计了一种迭代消除ICI的信道估计算法。仿真结果表明,由于进一步考虑了ICI对信道估计的影响,所提算法显著提高了PLC系统脉冲噪声环境下信道估计的准确性,相应改善了该系统的误码性能。Channel estimation in OFDM-based wide band power line communication (WB-PLC) system is severely impacted by impulse noise. In order to solve this problem, a method to determine the position of impulse noise is firstly proposed and then “null” processing is carried out. Although the time domain nonlinear processing eliminates the impact of impulse noise, it causes the inter carrier interference (ICI) and results in the loss of channel estimation performance. Therefore, a channel estimation algorithm using preamble in PLC system to eliminate the ICI iteratively is designed. Simulation results show that furtherly considering the influence of ICI on channel estimation, the proposed algorithm significantly improves the accuracy of channel estimation under the impulse noise environment and correspondingly improves the BER performance in PLC system.

关 键 词：宽带电力线通信 脉冲噪声 信道估计 子载波间干扰 

分 类 号：TN929.5[电子电信—通信与信息系统] TP391.9[电子电信—信息与通信工程]