Upper bounds on the capacity for optical intensity channels with AWGN  

作　　者：Yingying YU Zaichen ZHANG Liang WU Jian DANG 

机构地区：[1]National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China

出　　处：《Science China(Information Sciences)》2017年第2期161-172,共12页中国科学（信息科学）（英文版）

基　　金：supported by National Natural Science Foundation of China (Grant Nos. 61501109, 61571105, 61223001);National High Technology Research and Development Program of China (863) (Grant No. 2013AA013601);Jiangsu National Science Foundation (Grant No. BK20140646)

摘　　要：The channel capacity of the optical wireless communication（OWC） systems is still a problem that has not an optimal and close-form expression, in spite of OWC can be used to achieve high data rates. This paper presents novel upper bounds on the channel capacity of an optical intensity modulated and directed detection（IM/DD） system under peak-power and average-power constraints. The channel is modeled as an additive white Gaussian noise（AWGN） optical channel. The bounds are derived based on sphere-based signal space argument. Simulation results show the proposed bounds are tight at both high and low signal-to-noise ratios（SNRs）. Compared to those reported bounds, the derived bounds are better at high SNRs region in particular, and the expressions are simpler and unique for the whole range of average-to-peak-power ratio.The channel capacity of the optical wireless communication（OWC） systems is still a problem that has not an optimal and close-form expression, in spite of OWC can be used to achieve high data rates. This paper presents novel upper bounds on the channel capacity of an optical intensity modulated and directed detection（IM/DD） system under peak-power and average-power constraints. The channel is modeled as an additive white Gaussian noise（AWGN） optical channel. The bounds are derived based on sphere-based signal space argument. Simulation results show the proposed bounds are tight at both high and low signal-to-noise ratios（SNRs）. Compared to those reported bounds, the derived bounds are better at high SNRs region in particular, and the expressions are simpler and unique for the whole range of average-to-peak-power ratio.

关 键 词：channel capacity optical communication AWGN sphere-based signal space high signal-to-noise ratios （SNRs） 

分 类 号：TN929.1[电子电信—通信与信息系统]