Performance Analysis of FSO Communications With Diversity Methods

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dc.contributor.author Abou-Rjeily, Chadi
dc.date.accessioned 2016-02-15T07:12:11Z
dc.date.available 2016-02-15T07:12:11Z
dc.date.issued 2017-10-12
dc.identifier.issn 0733-8716 en_US
dc.identifier.uri http://hdl.handle.net/10725/3065
dc.description.abstract This paper targets the performance analysis of multiple-input-multiple-output (MIMO) point-to-point single-aperture relay-assisted and MIMO relay-assisted free-space optical (FSO) communications. The objective of the paper is to compare the different FSO diversity methods via an outage probability analysis over gamma-gamma turbulence channels in the case of independent fading among the different apertures of the communicating nodes. Through a well-tailored calculation method, we approximate the gamma-gamma distribution and the gamma-gamma sum-distribution by appropriate gamma distributions. This method resulted in simple closed-form outage probability expressions that are accurate for average-to-large values of the signal-to-noise ratio (SNR) and in asymptotic expressions that are useful for evaluating the diversity gains and coding gains. In particular, we derived the diversity gains of MIMO repetition coding (RC), MIMO transmit laser selection (TLS), MIMO all-active relaying (AR) and MIMO selective-relaying (SR). We prove that MIMO-RC and MIMO-TLS, on one hand, and MIMO-AR and MIMO-SR, on the second hand, achieve the same diversity gain and we evaluate the coding gain of TLS with respect to RC and of SR with respect to AR. By comparing the MIMO and cooperative methods with point receivers, we reach the central result that it is always better, from a diversity gain point of view, to add more apertures to the source and destination rather than adding more relays in their vicinity despite the fact that the fading variance along FSO links decreases with the distance. For receivers that implement aperture averaging, we derive conditions under which MIMO techniques are unconditionally better than cooperative techniques with any network topology. en_US
dc.language.iso en en_US
dc.title Performance Analysis of FSO Communications With Diversity Methods en_US
dc.type Article en_US
dc.description.version Published en_US
dc.title.subtitle Add More Relays or More Apertures? en_US
dc.author.school SOE en_US
dc.author.idnumber 200701131 en_US
dc.author.woa N/A en_US
dc.author.department Electrical Engineering en_US
dc.description.embargo N/A en_US
dc.relation.journal IEEE Journal on Selected Areas in Communications en_US
dc.journal.volume 33 en_US
dc.journal.issue 9 en_US
dc.article.pages 1890-1902 en_US
dc.identifier.doi http://dx.doi.org/10.1109/JSAC.2015.2432526 en_US
dc.identifier.ctation Abou-Rjeily, C. (2015). Performance analysis of FSO communications with diversity methods: Add more relays or more apertures?. IEEE Journal on Selected Areas in Communications, 33(9), 1890-1902. en_US
dc.author.email chadi.abourjeily@lau.edu.lb
dc.identifier.url http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=7106570
dc.orcid.id https://orcid.org/0000-0003-2255-1842

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