{"title":"Decision-Feedback Detection for Free-Space Optical Communications","authors":"M. Riediger, R. Schober, L. Lampe","doi":"10.1109/VETECF.2007.257","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"25 5","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"10","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2007 IEEE 66th Vehicular Technology Conference","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/VETECF.2007.257","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 10
Abstract
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.