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基于导频的室内可见光自适应OFDM通信系统信道估计
作者:黄震宇 郭树旭 张择书
来源:《现代电子技术》2014年第07期
(1.吉林大学 电子科学与工程学院, 吉林 长春 130012; 2.总参通信工程设计研究院, 辽宁 沈阳 110005)
摘 要: 使用自适应OFDM技术改善可见光通信系统性能,需要以准确的信道估计为前提。研究可见光自适应OFDM通信系统的基于导频的信道估计方法,引入射频通信中常用的LMS方法,与可见光信道基于LS的估计方法进行了比较,并对其特性进行了分析,仿真实验结果表明,采用LMS估计方法在BER为10-3水平时,SNR优于LS估计方法2 dB,LMS信道估计方法信道跟踪能力较强,比LS法抗干扰。
关键词: 可见光通信; 自适应OFDM; 信道估计; LMS方法
中图分类号: TN929.1?34 文献标识码: A 文章编号: 1004?373X(2014)07?0031?04 Pilot?based channel estimation for adaptive OFDM communication systems of indoor visible light
HUANG Zhen?yu1,2, GUO Shu?xu1, ZHANG Ze?shu1
(1. College of Electronic Science and Engineering, Jilin University, Changchun 130012, China;
2. Communication Engineering Design Research Institute of the PLA General staff, Shenyang 110005, China)
Abstract: Based on accurate channel estimation, adaptive OFDM technology can be used to improve the visible light communication system performance. The method of pilot?based channel estimation used in visible light adaptive OFDM communication systems is researched by introducing the LMS methods which is commonly used in the RF communication. Through compared with the existing LS?based estimation methods, their characteristics are analyzed. The simulation results show that when BER turns to be 10-3 with LMS estimation method, the SNR can be 2dB better than LS method. So the channel tracking ability of LMS channel estimation method is stronger, and the anti?jamming capability is better than LS method.

