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Bi‐directional relay‐assisted FSO communication systems over strong turbulence channels with pointing errors
Author(s) -
Puri Parul,
Garg Parul,
Aggarwal Mona
Publication year - 2015
Publication title -
international journal of communication systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.344
H-Index - 49
eISSN - 1099-1131
pISSN - 1074-5351
DOI - 10.1002/dac.3027
Subject(s) - relay , computer science , bit error rate , communications system , channel (broadcasting) , path loss , relay channel , non line of sight propagation , free space optical communication , optical communication , channel capacity , telecommunications , algorithm , electronic engineering , topology (electrical circuits) , wireless , mathematics , physics , power (physics) , quantum mechanics , engineering , combinatorics
Summary This paper presents the capacity and average bit error rate (BER)‐based performance analysis of a two‐way relay‐assisted free‐space optical communication system, over an atmospheric turbulent channel modeled by the Gamma–Gamma distribution and also affected by path loss and misalignment errors. A half‐duplex, decode‐and‐forward, two‐way, optical relay is considered, which establishes communication between two terminals, when direct communication is not possible because of non line‐of‐sight propagation or large distance. For the presented system and channel models and considering heterodyne detection at the receiver, we formulate the statistics of the instantaneous signal‐to‐noise ratio, followed by calculation of exact analytical expressions of capacity and BER. The mathematical expressions are formulated in terms of easily computable Meijer's G‐function. This mathematical analysis is accompanied with several numerical examples to illustrate the effect of the key system parameters. Copyright © 2015 John Wiley & Sons, Ltd.