A Modified Viterbi Equalization Algorithm for Mitigating Timing Errors in Optical Turbulence Channels

doi:10.1109/TWC.2021.3051161

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	A Modified Viterbi Equalization Algorithm for Mitigating Timing Errors in Optical Turbulence Channels
	Y. Li; T. Geng; R. Tian and S. Gao
刊名	IEEE Transactions on Wireless Communications
	2021
卷号	20 期号:6 页码:3491-3506
ISSN号	15361276
DOI	10.1109/TWC.2021.3051161
英文摘要	In high-speed optical wireless communication (OWC) systems, timing errors can blur the edges of the received symbols, defined by the deviation of a signal's timing event from its intended occurrence. The timing errors introduce the inter-symbol interference (ISI) to the neighboring symbols. In order to mitigate the degradation, a maximum likelihood (ML) based Timing Error Viterbi Equalization (TEVE) algorithm is proposed, in which the probability density functions (PDF) of the channel conditions and the timing errors are priori information. The mathematical form of each branch metric (BM) is deduced by those statistics in different situations of neighboring signs of timing errors. The summations of BMs form the cumulative metrics (CM). By adopting the add-compare-select iterations, we are able to detect symbols with the largest CMs. The theoretical closed-form average bit error rates (BER) are also deduced and compared in the cases whether the TEVE algorithm is utilized. Experimental results indicate that our proposed method can reduce timing errors' impairment significantly with an acceptable complexity. 2002-2012 IEEE.
URL标识	查看原文
内容类型	期刊论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/65430]
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Y. Li,T. Geng,R. Tian and S. Gao. A Modified Viterbi Equalization Algorithm for Mitigating Timing Errors in Optical Turbulence Channels[J]. IEEE Transactions on Wireless Communications,2021,20(6):3491-3506.
APA	Y. Li,T. Geng,&R. Tian and S. Gao.(2021).A Modified Viterbi Equalization Algorithm for Mitigating Timing Errors in Optical Turbulence Channels.IEEE Transactions on Wireless Communications,20(6),3491-3506.
MLA	Y. Li,et al."A Modified Viterbi Equalization Algorithm for Mitigating Timing Errors in Optical Turbulence Channels".IEEE Transactions on Wireless Communications 20.6(2021):3491-3506.