Dimming-Aware Interference Mitigation for NOMA-Based Multi-Cell VLC Networks

This letter proposes inter-cell interference mitigation in a dimming-aware way for multi-cell visible-light communication networks, through efficient time-scheduling, scaling, and coordination of non-orthogonal multiple access (NOMA) transmissions at the access points. By this method, users are grou...

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Bibliographic Details
Published in:IEEE communications letters 2020-11, Vol.24 (11), p.2541-2545
Main Authors: Eltokhey, Mahmoud Wafik, Khalighi, Mohammad-Ali, Ghassemlooy, Zabih
Format: Article
Language:English
Subjects:
Communication networks
Dimming
Engineering Sciences
inter-cell interference
Interference
Light emitting diodes
multi-cell networks
NOMA
non-orthogonal multiple access
Nonorthogonal multiple access
Optical communication
Optical refraction
Optical variables control
Optics
Photonic
Signal and Image processing
Signal to noise ratio
Silicon carbide
Visible light communications
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Summary:This letter proposes inter-cell interference mitigation in a dimming-aware way for multi-cell visible-light communication networks, through efficient time-scheduling, scaling, and coordination of non-orthogonal multiple access (NOMA) transmissions at the access points. By this method, users are grouped and served in different time slots depending on whether they are at the center or at the edge of the cell. This reduces the number of NOMA users per time slot, which decreases the network computational complexity, by reducing the average number of successive interference cancellation steps. Comparison of the proposed scheme with the classical NOMA over different dimming constraints shows an improvement of up to 39% and 37% in the average sum-rate and fairness, respectively, for a 30% duty cycle transmission in a 4-cell scenario with 8 users.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2020.3007552