Joint NOMA for Improved SER of Cell-Edge Users in Multi-Cell Indoor VLC

In this letter, we propose a non-orthogonal multiple access (NOMA) based scheme for multi-cell indoor visible light communications (VLC), where cell-edge user is jointly served by multiple cells. Unlike the typical designs in NOMA-VLC literature, the proposed scheme doesn't involve complex doma...

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Bibliographic Details
Published in:IEEE wireless communications letters 2022-01, Vol.11 (1), p.13-17
Main Authors: Uday, T., Kumar, Abhinav, Natarajan, L.
Format: Article
Language:English
Subjects:
Cell-edge user
Complexity
Direct current
Light emitting diodes
Maximum likelihood decoding
NOMA
non-orthogonal multiple access
Nonorthogonal multiple access
OFDM
Optical transmitters
Optical variables control
Silicon carbide
symbol error rate
Visible light communication
visible light communications
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Summary:In this letter, we propose a non-orthogonal multiple access (NOMA) based scheme for multi-cell indoor visible light communications (VLC), where cell-edge user is jointly served by multiple cells. Unlike the typical designs in NOMA-VLC literature, the proposed scheme doesn't involve complex domain and direct current bias addition, which makes the design simple and feasible for real time implementation in indoor VLC. The symbol error rate (SER) of the proposed NOMA scheme is analysed using simulation results, and is compared with orthogonal multiple access (OMA). It is observed that the average SER of the users with the proposed NOMA is marginally degraded as compared to OMA. However, the SER of cell-edge user with the proposed NOMA is significantly improved with joint maximum likelihood decoding, and outperforms successive interference cancellation based decoding and OMA, with trade-off on computational complexity.
ISSN:2162-2337
2162-2345
DOI:10.1109/LWC.2021.3117923