Optimization of the Receiving Orientation Angle for Zero-Forcing Precoding in VLC

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 environ...

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Bibliographic Details
Published in:IEEE communications letters 2021-03, Vol.25 (3), p.921-925
Main Authors: Morales-Cespedes, Maximo, Haas, Harald, Armada, Ana Garcia
Format: Article
Language:English
Subjects:
Algorithms
Complexity theory
Line of sight communication
multiuser multiple-input single-output
optical channel
Optimization
Orientation
Performance degradation
Photodetectors
Photometers
Precoding
Radio frequency
Receiving
Scattering
Simulation
Visible light communication
Visible light communications
zero forcing
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Summary: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.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2020.3038027