Optimization of the receiving orientation angle for zero-forcing precoding in VLC

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Céspedes, Máximo Morales and Haas, Harald and Armada, Ana García (2021) Optimization of the receiving orientation angle for zero-forcing precoding in VLC. IEEE Communications Letters, 25 (3). pp. 921-925. ISSN 1089-7798 (https://doi.org/10.1109/LCOMM.2020.3038027)

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Abstract

We study the performance of linear zero-forcing (ZF) precoding in multiuser multiple-input single-output visible light communications (VLC) when we are able to select the receiving orientation angle (ROA) of each user. For radio-frequency communications, the non-line-of-sight rich scattering environment usually ensures the linear independence among user’s channels. However, this condition is less likely to happen in VLC systems, degrading the performance of ZF precoding. In this work, we propose a variable ROA (vROA) photodetector able to modify its orientation vector in order to generate semi-orthogonal channel responses among users. We derive the algorithm for determining the orientation of the vROA photodetector of each user, obtaining optimal and suboptimal solutions with high and low complexity, respectively. Simulation results show that the performance of ZF precoding is improved considerably by managing the users ROA.

  • Item type:Article
    ID code:76689
    Dates:
    Date
    Event
    31 March 2021
    Published
    16 November 2020
    Published Online
    9 November 2020
    Accepted
    Notes:© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:07 Jun 2021 10:30
    Last modified:20 Nov 2024 19:45
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/76689
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