Mitigation of the Background Radiation for Free-Space Optical IM/DD Systems

被引：8

作者：

Song, Tianyu ^{[1
,2
]}

Wu, Ming-Wei ^{[3
]}

Kam, Pooi-Yuen ^{[1
,2
]}

机构：

[1] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117583, Singapore

[2] Natl Univ Singapore, Res Inst, Ctr Adv Microelect Devices, Suzhou 215123, Peoples R China

[3] Zhejiang Univ Sci & Technol, Sch Informat & Elect Engn, Hangzhou 310023, Zhejiang, Peoples R China

来源：

IEEE COMMUNICATIONS LETTERS | 2018年 / 22卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Background radiation; free-space optical (FSO); generalized likelihood ratio test (GLRT); intensity modulation/direct detection (IM/DD); sequence detection; CHANNEL ESTIMATION;

D O I：

10.1109/LCOMM.2017.2768418

中图分类号：

TN [电子技术、通信技术];

学科分类号：

0809 ;

摘要：

Atmospheric turbulence and pointing errors cause fluctuations in the signal intensity of the free-space optical intensity-modulation/direct-detection link. Additionally, background radiation brings a noisy photocurrent component into the received signal. Using the generalized likelihood ratio test principle, a Viterbi-type trellis-search sequence receiver is proposed, which estimates both the channel gain and the background component and detects the data sequence simultaneously. It has the advantage of a low search complexity that does not depend on the observation window length L, and its error performance approaches that of detection with perfect channel state information and no background radiation, as L becomes large.

引用

页码：292 / 295

页数：4

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