Dual-Filter Architecture for Blind Feedback Recovery of the Symbol Timing in Bandlimited Optical Intensity Channels

被引:0
作者
Gappmair, Wilfried [1 ]
Schlemmer, Harald [2 ]
机构
[1] Graz Univ Technol, Inst Commun Networks & Satellite Commun, Inffeldgasse 12, A-8010 Graz, Austria
[2] Joanneum Res, Inst Informat & Commun Technol, Steyrergasse 17, A-8010 Graz, Austria
关键词
symbol timing recovery; optical wireless communications; intensity modulation; pulse shaping; PERFORMANCE;
D O I
10.3390/electronics12061411
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
Reliable recovery of transmission parameters is of paramount importance not only for radio frequency receivers, but also for optical wireless communication solutions. This paper discusses a feedback algorithm for recovering the symbol timing in the context of a bandlimited optical intensity link. The link is determined by a PAM scheme and pulse shaping with squared raised cosine or double jump functions. When preambles or pilot sequences are not available to the receiver, non-data-aided (blind) recovery concepts are useful for tracking smaller variations of the timing error affecting the payload data. The current state-of-the-art solution uses a Gardner detector with two samples per symbol, although this introduces a non-negligible amount of inter-symbol interference resulting in an error floor. To avoid this drawback, the authors propose a dual-filter approach which includes an appropriately designed filter operated in parallel to the receiver filter. Despite the additional complexity of the dual-filter architecture, the recovery loop is very simple and requires only one sample per symbol, representing the lowest degree of complexity in this respect. Open-loop characteristic, jitter performance, and acquisition behavior of the suggested recovery loop are investigated.
引用
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页数:12
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