Decision-Feedback Detection for Free-Space Optical Communications

M. Riediger, R. Schober, L. Lampe
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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.
自由空间光通信决策反馈检测
自由空间光学(FSO)最近在最后一英里无线链路中受到越来越多的关注。在本文中,我们研究了FSO系统中开关键控(OOK)的非相干检测,即假设接收端没有信道状态信息的检测。为了部分恢复与传统的逐符号非相干检测相关的性能损失,我们考虑了决策反馈检测(DFD)的应用,其中使用先前的决策和N个接收统计量的观察窗口进行逐符号决策。分析和仿真结果表明,随着窗口长度的增加,DFD接收机的性能逐渐接近相干检测下界。因此,由于所提出的接收机显示出与N无关的复杂性,因此得出结论,DFD是FSO系统中非相干检测的有效方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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