现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2014年
7期
31-34
,共4页
可见光通信%自适应OFDM%信道估计%LMS方法
可見光通信%自適應OFDM%信道估計%LMS方法
가견광통신%자괄응OFDM%신도고계%LMS방법
visible light communication%adaptive OFDM%channel estimation%LMS method
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。
使用自適應OFDM技術改善可見光通信繫統性能,需要以準確的信道估計為前提。研究可見光自適應OFDM通信繫統的基于導頻的信道估計方法,引入射頻通信中常用的LMS方法,與可見光信道基于LS的估計方法進行瞭比較,併對其特性進行瞭分析,倣真實驗結果錶明,採用LMS估計方法在BER為10-3水平時,SNR優于LS估計方法2 dB,LMS信道估計方法信道跟蹤能力較彊,比LS法抗榦擾。
사용자괄응OFDM기술개선가견광통신계통성능,수요이준학적신도고계위전제。연구가견광자괄응OFDM통신계통적기우도빈적신도고계방법,인입사빈통신중상용적LMS방법,여가견광신도기우LS적고계방법진행료비교,병대기특성진행료분석,방진실험결과표명,채용LMS고계방법재BER위10-3수평시,SNR우우LS고계방법2 dB,LMS신도고계방법신도근종능력교강,비LS법항간우。
Based on accurate channel estimation,adaptive OFDM technology can be used to improve the visible light com-munication system performance. The method of pilot-based channel estimation used in visible light adaptive OFDM communica-tion systems is researched by introducing the LMS methods which is commonly used in the RF communication. Through com-pared 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.