M-ary Double-layer Optical Camera Communication For Intelligent Transport System

摘要

An M-ary double-layer optical camera communication (OCC) system for intelligent transport system (ITS) is proposed. According to the importance of information, the message is split into different priorities. The low-priority data is transmitted with high data rate at the upper layer in high multiplexing mode, whereas the high-priority data is transmitted with high robustness at the lower layer using high diversity scheme. In order to fully utilize the resources of the lower layer which usually occupies more power, the M-ary modulation is introduced into the lower layer signal. Combined with system model, the message can be detected by using a low-complexity ML detection algorithm. Finally, computer simulations verified the system feasibility. With reliable and low-complexity detection, the data rate of the lower layer obtained exponentially enhancement.