Title :
Performance Analysis of Parallel Relaying in Free-Space Optical Systems
Author :
Aghajanzadeh, Sahar Molla ; Uysal, Murat
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Waterloo, Waterloo, ON, Canada
Abstract :
In this paper, we investigate the information theoretic performance of parallel relaying in free-space optical (FSO) communications over Gamma-Gamma fading channels. We consider an intensity modulation/direct-detection (IM/DD) FSO system with a single relay and a line-of-sight link between the source and the destination. Considering both amplify-and-forward and decode-and-forward relaying, we develop performance characterizations of each relaying mode in terms of outage probability, diversity gain, coding gain, and diversity-multiplexing tradeoff (DMT). Our results demonstrate that parallel relaying improves the performance of FSO systems by bringing diversity advantages. In addition, both relaying modes achieve the same DMT and diversity gain while their coding gains can be different depending on underlying channels´ characteristics.
Keywords :
amplify and forward communication; decode and forward communication; diversity reception; fading channels; free-space optical communication; probability; relay networks (telecommunication); DMT; FSO communications; Gamma-Gamma fading channels; IM-DD FSO system; amplify-and-forward relaying; coding gain; decode-and-forward relaying; diversity gain; diversity-multiplexing tradeoff; free-space optical communications; information theoretic performance; intensity modulation-direct-detection FSO system; line-of-sight link; outage probability; parallel relaying; relaying mode; Diversity methods; Encoding; Fading; Multiplexing; Radio frequency; Relays; Signal to noise ratio; Free-space optical communications; coding gain; diversity gain; diversity-multiplexing tradeoff; parallel relaying;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.2015.2469685
