第20卷第1期 2012年1月
1004-924X(2012)01-0024-07
文章编号
光学精密工程
Optics and Precision Engineering
Vol. 20No.1
Jan,2012
室内可见光通信中的分数间隔均衡技术
王俊波*，谢秀秀，曹玲玲，盛明，冯敏
（南京航空航天大学电子信息工程学院，江苏南京210016）
摘要：研究了室内可见光通信系统分数间隔均衡技术，以降低码间干扰对该通信系统性能的影响。针对室内可见光通信系统的传输特点和信号调制特性，建立了室内可见光通信链路模型；在此基础上，提出了分数间隔均衡方法，并利用最小均方误差准则优化设计均衡器。最后，通过计算机仿真，对提出的分数间隔均衡方法进行了性能评估。实验结果表明，相同误码率条件下，T/2分数间隔均衡器比符号间隔均衡器的性能优1～2dB，能够更有效地抑制由信道多径效应等引起的码间干扰，提高信号传输的可靠性。
关键词：室内可见光通信；码间干扰；均方误差准财；分数间隔均衡器；符号间隔均衡器
中图分类号：TN929.1
文献标识码：A
doi;10, 3788/OPE. 20122001. 0024
Fractionallyspacedequalizerforindoorvisiblelight
communicationsystem
WANG Jun-bo',XIE Xiu-xiu, CAO Ling-ling,SHENG Ming,FENG Min
(Collegeof Electronics and InformationEngineering,
NanjingUniversityofAeronauticsandAstronauticsNanjing210016,China)
Correspondingauthor，E-mail:jbwang@nuaa.edu.cn
Abstract: The Fractionally Spaced Equalization (FSE) technology is investigated to mitigate the effects of In-ter-symbol Interference (ISI) on the indoor Visible Light Communication (VLC) systems, Based on the prop agation properties and signal modulation characteristics of indoor VLC systems, a link model for the indoor VLC communications is described, then the FSE method is proposed by using the link model. Furthermore, based on the minimum Mean Square Error (MSE) criterion, the FSE is optimized. Finally, the performance of the proposed FSE theory is evaluated by computer simulation. Experimental results indicate that the per formance of T/2-fractionally spaced equalizer has improved 12 dB than that of the symbol interval equalizer in the same Bit Error Ratio(BER). It can eliminate the effects of the ISI induced by the multipath effectively, and can improve the reliability of signal transmission.
Key words: indoor Visible Light Communication (VLC); Inter-symbol Interference (ISI); Mean Square Er-
ror (MSE)criterion：FractionallySpacedEqualizer(FSE);symbol spaced equalizer
收稿日期：2011-06-23；修订日期：2011-08-30，
基金项目：国家自然科学基金资助项目（No.61102068)；东南大学移动通信国家重点实验室开放研究基金资助课题
(No.2010D01)；教育部高等学校博士学科点专项科研基金资助项目（No，20113218120017)；中国博士后科学基金资助项目(No.20110490389)；南京航空航天大学研究生创新基地开放基金资助（No.kfj20110213)；南京航空航天大学基本科研业务费专项基金资助项目（No.NS2011013)