@article {Illi2021261,
	title = {Analysis of Asymmetric Dual-Hop Energy Harvesting-Based Wireless Communication Systems in Mixed Fading Environments},
	journal = {IEEE Transactions on Green Communications and Networking},
	volume = {5},
	number = {1},
	year = {2021},
	note = {cited By 3},
	pages = {261-277},
	abstract = {This work investigates the performance of a dual-hop energy harvesting-based fixed-gain amplify-and-forward relaying communication system, subject to fading impairments. We consider a source node ( {S} ) communicating with a destination node ( {D} ), either directly or through a fixed distant relay ( {R} ), which harvests energy from its received signals and uses it to amplify and forward the received signals to {D}. We also consider maximal-ratio combining at {D} to combine the signals coming from {S} and {R}. Both power-splitting and time-switching energy harvesting protocols are investigated. The {S}\,\,-\,\,{R} link is modeled by Nakagami- {m} fading model, while the {R}\,\,-\,\,{D} and {S}\,\,-\,\,{D} links experience \alpha - μ fading. Closed-form expressions for the statistical properties of the total signal-to-noise ratio are derived, based on which novel closed-form expressions are then derived for the average symbol error rate as well as for the average channel capacity, considering four different adaptive transmission policies. The derived expressions are validated through Monte Carlo simulations. {\textcopyright} 2017 IEEE.},
	keywords = {Adaptive transmission policy, Amplify-and-forward relaying, Average channel capacities, Average symbol error rate (SER), Channel capacity, Closed-form expression, Energy harvesting, Maximal ratio combining (MRC), Monte Carlo methods, Signal to noise ratio, Statistical properties, Wireless communication system},
	doi = {10.1109/TGCN.2020.3035512},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85103177403\&doi=10.1109\%2fTGCN.2020.3035512\&partnerID=40\&md5=8bfc86e88ca31e88a392a44a37280141},
	author = {Illi, E. and Bouanani, F.E. and Sofotasios, P.C. and Muhaidat, S. and Costa, D.B.D. and Ayoub, F. and Al-Fuqaha, A.}
}
@article {Illi2020,
	title = {A PHY layer security analysis of a hybrid high throughput satellite with an optical feeder link},
	journal = {IEEE Open Journal of the Communications Society},
	volume = {1},
	year = {2020},
	note = {cited By 8},
	abstract = {Hybrid terrestrial-satellite (HTS) communication systems have gained a tremendous amount of interest recently due to the high demand for global high data rates. Conventional satellite communications operate in the conventional Ku (12 GHz) and Ka (26.5-40 GHz) radio-frequency bands for assessing the feeder link, between the ground gateway and the satellite. Nevertheless, with the aim to provide hundreds of Mbps of throughput per each user, free-space optical (FSO) feeder links have been proposed to fulfill these high data rates requirements. In this paper, we investigate the physical layer security performance for a hybrid very high throughput satellite communication system with an FSO feeder link. In particular, the satellite receives the incoming optical wave from an appropriate optical ground station, carrying the data symbols of N users through various optical apertures and combines them using the selection combining technique. Henceforth, the decoded and regenerated information signals of the N users are zero-forcing (ZF) precoded in order to cancel the interbeam interference at the end-users. The communication is performed under the presence of malicious eavesdroppers nodes at both hops. Statistical properties of the signal-to-noise ratio of the legitimate and wiretap links at each hop are derived, based on which the intercept probability metric is evaluated. The derived results show that above a certain number of optical apertures, the secrecy level is not improved further. Also, the system{\textquoteright}s secrecy is improved using ZF precoding compared to the no-precoding scenario for some specific nodes{\textquoteright} positions. All the derived analytical expressions are validated through Monte Carlo simulations. {\textcopyright} 2021 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.},
	keywords = {Analytical expressions, Feeding, Information signals, Inter-beam interference, Monte Carlo methods, Optical ground station, Physical layer, Physical layer security, Radio frequency bands, Satellite communication systems, Satellite communications, Satellites, Signal to noise ratio, Statistical properties},
	doi = {10.1109/OJCOMS.2020.2995327},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85098417335\&doi=10.1109\%2fOJCOMS.2020.2995327\&partnerID=40\&md5=2ca3d202a9febc6959808157b5759568},
	author = {Illi, E. and El Bouanani, F. and Ayoub, F. and Alouini, M.-S.}
}
