可见光通信中解调信号与基带信号关系的研究

Research on the relationship between demodulation signal and baseband signal in visible light communication

高精度可见光通信模型的建立是室内可见光通信系统设计与分析的重要基础.为了便于可见光通信系统中光源布局、发光二极管(LED)数目、发射端与接收端之间相对位置的确立和驱动电压的选择,以距离平方反比定律为基础,通过对光电二极管接收到的光强进行积分得到光通量,首次将可见光通信系统中基带信号和解调信号建立定量关系.搭建可见光通信试验系统验证建立关系的正确性,试验结果表明该模型的相对误差小于0.1.

The establishment of high precision visible light communication model is important for the design and analysis of indoor visible light communication system. In order to conveniently determine the layout of the light source, the number of LEDs, the relative position between the transmitter and the receiver in the visible light communication system, and select the driving voltage, the luminous flux is obtained, based on the distance inverse square law, by integrating the light intensity received by the photodiode, and the relationship is established between the baseband signal and the demodulated signal for the first time. A visible light communication experimental system was built to verify the correctness of the relationship, and the results show that the relative error of the model is less than 0.1.