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.