RT Journal Article
T1 Optimization of the Receiving Orientation Angle for Zero-Forcing Precoding in VLC
A1 Morales Céspedes, Máximo
A1 Haas, Harald
A1 García-Armada, Ana
AB 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.
PB IEEE
SN 1089-7798
YR 2021
FD 2021-03-01
LK https://hdl.handle.net/10016/32606
UL https://hdl.handle.net/10016/32606
LA eng
NO This work has been supported by the Spanish National Project TERESAADA (TEC2017-90093-C3-2-R) (MINECO/AEI/FEDER, UE) and the research project GEOVEOLUZ-CM-UC3M.
DS e-Archivo
RD 1 sept. 2024