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Performance analysis of mixed free-space optics/radio frequency amplify-and-forward systems with pointing errors.


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Cherif, Nesrine (2017). Performance analysis of mixed free-space optics/radio frequency amplify-and-forward systems with pointing errors. Mémoire. Québec, Université du Québec, Institut national de la recherche scientifique, Maîtrise en télécommunications, 93 p.

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Driven by the high data rates demand and the exponential growth of wireless de- vices, free-space optics FSO is presented as a strong and reliable candidate for the next generation mobile cellular networks. In addition to securing a high throughput and high-speed data services, FSO technology is an easily deployable cost-effective approach that offers a strong immunity to interference. Despite these advantages, FSO transmission is hampered by atmospheric turbulence-induced fading and point- ing errors. These constraints shorten the FSO transmission to small distance. To widen the coverage and ensure the reliability of the FSO link for next generation cellular backhaul networks, relay-assisted mixed FSO/RF systems have gained such a great interest in recent times. The main objective of this work is to investigate the performance of relay-assisted mixed FSO/RF system. Toward this end, we de- rive closed-form expressions for the ergodic capacity and the outage probability that unify almost all turbulence/fading linear distributions discovered until present while accounting for heterodyne and intensity modulation/direct detection (IM/DD) techniques. The originality of this work relies on the consolidation of two generalized channel models for the FSO and RF links. Furthermore, the derived closed-form expressions, all in terms of Fox-H function (FHF) and bivariate FHF, are exact and accurate since no approximations were employed. Moreover, we extend our analysis to a mixed FSO/RF design where the co-channel interference (CCI) at the mobile user is presumed. In this system model, we derive closed-form expressions of the end-to-end performance metrics, i.e., the outage probability, the average bit-error rate (BER), and the ergodic capacity, all in terms of bivariate FHF. The completeness of our work is emphasized through the investigation of fixed-gain and channel-state information (CSI)-assisted relaying schemes and the association of both heterodyne and IM/DD detection techniques. Motivated by the obtained results, we conduct a further study to investigate the effect of spatial diversity on the system performance by considering multi-aperture/multiuser system, where we also study the large scale regime. The spacial diversity resulting from the use of the maximum ratio transmission (MRT) at the multi-aperture FSO link and the user scheduling for the multiuser RF link further enhanced the performance by mitigating the effects of the turbulence, the pointing errors, and the fading in the mixed FSO/RF system.

Type de document: Thèse Mémoire
Directeur de mémoire/thèse: Affes, Sofiène
Mots-clés libres: high data rates; wireless; mobile cellular network; free-space optics; FSO; maximum ratio transmission; mixed FSO/RF
Centre: Centre Énergie Matériaux Télécommunications
Date de dépôt: 27 nov. 2017 21:20
Dernière modification: 27 nov. 2017 21:20
URI: https://espace.inrs.ca/id/eprint/6512

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