Decision-Feedback Detection for Free-Space Optical Communications

TitleDecision-Feedback Detection for Free-Space Optical Communications
Publication TypeConference Paper
Year of Publication2007
AuthorsRiediger, M. L. B., R. Schober, and L. Lampe
Conference NameVehicular Technology Conference, 2007. VTC-2007 Fall. 2007 IEEE 66th
Pagination1193 -1197
Date Publishedsep.
Keywordsamplitude shift keying, automatic repeat request, channel state information, decision-feedback detection, DFD receiver, error statistics, free-space optical communications, FSO system, noncoherent detection, on-off keying, OOK, optical links, optical modulation, optical receivers, optical signal detection, symbol-by-symbol decisions

Free-space optics (FSO) have received increased attention recently for last-mile wireless links. In this paper, we investigate noncoherent detection, i.e. detection assuming the absence of channel state information at the receiver, of on-off keying (OOK) in an FSO system. To partially recover the performance loss associated with conventional symbol-by- symbol noncoherent detection, we consider the application of decision-feedback detection (DFD), in which symbol-by-symbol decisions are made using previous decisions and an observation window of N received statistics. Analytical and simulation results indicate that the performance of a DFD receiver approaches the coherent detection lower bound with increasing window length. Consequently, as the proposed receiver exhibits a complexity independent of N, the conclusion is reached that DFD is an effective approach for noncoherent detection in an FSO system.


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