A multi-layer VLC system with low-complexity detection algorithm

In this paper, we consider a multi-layer visible light communication system where data of different attribute are split into multiple layers with different bit rates and reliability to satisfy data transmission in priorities. In proposed approach, high-priority data is assigned to upper layers with higher reliability through high diversity, while low-priority data is assigned to lower layers with higher bit rates through high multiplexing. In addition, two detection algorithms are presented for fast decoding: one is low-complexity sum detection, the other is fast maximum likelihood detection. Simulation shows that maximum likelihood (ML) detection has more excellent performance and higher computation complexity than sum detection in general, while both algorithms have similar performance when upper layers obtain sufficient power.