Fan Kai, Wang Jianping, Chen Danyang, Lu Huimin
Appl Opt. 2022 Sep 10;61(26):7552-7557. doi: 10.1364/AO.468028.
A hybrid multi-user access scheme based on orthogonal frequency-division multiple access and non-orthogonal multiple access (OFDMA-NOMA) is proposed for visible light communication (VLC) systems with a bandwidth-constrained channel. In the scheme, a novel user resource allocation method is used, to the best of our knowledge, to reduce the unfairness among different users caused by the high-frequency fading characteristic of VLC systems. Furthermore, the particle swarm optimization (PSO) is introduced to satisfy the transmitting power requirements of each user and to improve system performance. Simulation results show that, under the same VLC system conditions, the OFDMA-NOMA scheme with PSO has significant improvements in terms of user capacity and transmission rates compared to the purely NOMA scheme and the OFDMA scheme.
针对具有带宽受限信道的可见光通信（VLC）系统，提出了一种基于正交频分多址接入和非正交多址接入（OFDMA-NOMA）的混合多用户接入方案。在该方案中，据我们所知，采用了一种新颖的用户资源分配方法，以减少VLC系统高频衰落特性给不同用户间带来的不公平性。此外，引入粒子群优化（PSO）来满足每个用户的发射功率要求并提高系统性能。仿真结果表明，在相同的VLC系统条件下，与纯NOMA方案和OFDMA方案相比，采用PSO的OFDMA-NOMA方案在用户容量和传输速率方面有显著提升。
