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AuthorSoltani M.D.
AuthorArfaoui M.A.
AuthorTavakkolnia I.
AuthorGhrayeb A.
AuthorSafari M.
AuthorAssi C.M.
AuthorHasna M.O.
AuthorHaas H.
Available date2020-04-23T14:21:34Z
Publication Date2019
Publication NameIEEE Journal on Selected Areas in Communications
ResourceScopus
ISSN7338716
URIhttp://dx.doi.org/10.1109/JSAC.2019.2929381
URIhttp://hdl.handle.net/10576/14377
AbstractAmong the challenges of realizing the full potential of light-fidelity (LiFi) cellular networks are user mobility, random device orientation, and blockage. In this paper, we study the impact of those challenges on the performance of LiFi networks in an indoor environment using measurement-based channel models, unlike existing studies that rely on theoretical channel models. In our paper, we adopt spatial modulation (SM) and consider two configurations for the user equipment (UE). A multi-directional receiver (MDR) structure is proposed, in which the PDs are located on different sides of the UE, e.g., a smartphone. This configuration is motivated by the fact that conventional structures exhibit poor performance in the presence of random device orientation and blockage. In fact, we show that the MDR outperforms the benchmark structure by over 10 dB at bit-error ratio (BER) of $3.8\times 10^{-3}$. Moreover, an adaptive access point (AP) selection scheme for the SM is considered, where the number of APs is chosen adaptively in an effort to achieve the lowest energy requirement for a target BER and spectral efficiency. The user performance with random orientation and blockage in the entire room is evaluated for sitting and walking activities, for which the orientation-based random waypoint (ORWP) mobility model is invoked. Furthermore, we demonstrate that the proposed adaptive technique with SM outperforms the conventional spatial multiplexing system. We also study the performance of the underlying system on the uplink channel where we apply the same techniques used for the downlink channel. It is shown analytically that the multi-directional transmitter (MDT) with adaptive SM is highly energy efficient. - 1983-2012 IEEE.
SponsorM. D. Soltani acknowledges the School of Engineering for providing financial support. M. A. Arfaoui, A. Ghrayeb and M. Hasna are supported in part by Qatar National Research Fund under NPRP Grant NPRP8-052-2-029 and in part by FQRNT. C. Assi acknowledges the financial support from Concordia University and FQRNT. H. Haas acknowledges the financial support from the Wolfson Foundation and Royal Society. He also gratefully acknowledges financial support by the Engineering and Physical Sciences Research Council (EPSRC) under an Established Career Fellowship grant EP/R007101/1 and grant EP/L020009/1 (TOUCAN).
Languageen
PublisherInstitute of Electrical and Electronics Engineers Inc.
Subjectblockage
Light fidelity (LiFi)
mobility
optical wireless communication (OWC)
random orientation
spatial modulation (SM)
TitleBidirectional Optical Spatial Modulation for Mobile Users: Toward a Practical Design for LiFi Systems
TypeArticle
Pagination2069-2086
Issue Number9
Volume Number37
dc.accessType Abstract Only


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