为适应多用户需求,提出了一种基于多进制检测的可见光多层成像通信系统.依不同优先权将发送信息加载在分集程度不同的各层发送单元上.优先权越高,分集程度越高,信息的鲁棒性相对较高但传输速率较低;相反的,优先权越低,复用程度越高,信息的传输速率相对较高但鲁棒性较低.结合系统模型,利用基于最大似然检测的多进制检测算法实现了信息提取.最后,通过仿真实验验证了系统的可行性.在保证系统检测性能和算法复杂度相对较低的同时,实现了多层成像通信系统的稳定传输.%A multi-layer Optical Camera Communication(OCC) system based on M-ary detection is proposed to adapt to the needs of multiuser. According to different priorities, the message is loaded on each layer which has diverse degrees of diversity. The higher-priority data is transmitted in higher diversity mode with higher robustness but lower data rate, whereas the lower-priority data is sent using higher multiplexing scheme with higher data rate but lower robustness. Combined with the OCC system model, the message can be detected by using an M-ary detection algorithm based on Maximum Likelihood (ML) detection. Finally, computer simulations verify the system feasibility. With reliable and low-complexity detection, the multi-layer OCC transmission system can be achieved stably.
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