LED室内可见光语音通信系统设计及实现

摘要

As a main illumination tool , light emitting diode ( LED ) light can be utilized in optical communication system because of the high sensitivity .In order to study and verify the receiving performance and the transmission distance of a LED indoor visible light voice communication system , referring to the channel model of an infrared communication and the effect of the reflected lights , the signal power of the receiving point on the desktop was calculated according to indoor illumination standard by multipath overlay grid algorithm and the sending and receiving circuits of LED visible light voice single-direction communication system was designed and realized .The results show that when the emissive power of LED light is above 2W and the communication rate in the signal physical layer is less than 1Mbit/s, the system is suitable for the actual requirements of the received power and the received signal-noise-rate and can achieve the no-distortion decoding and clear listening in 10m limit.This result is helpful for the research and application of LED visible-light communication systems.%LED灯作为主要的新型照明工具，因其较高的灵敏度，可用于光通信系统中。为了研究与验证LED室内可见光语音通信系统的接收性能与传输距离，参照红外通信的信道模型，融入反射光的影响因素，在使用室内标准照明的光发射功率下，采用多径叠加网格算法，计算桌面各接收点接收信号功率等参量的分布，并设计与实现了LED可见光语音单向通信系统的收发电路。结果表明，当LED灯的发射功率大于2W、信号物理层通信速率不高于1Mbit／s的情况下，系统能够满足信号接收功率与接收信噪比的实际通信要求，并能够实现10m距离内的信号无失真解码与清晰收听。这一结果对LED可见光通信系统进一步的研究与应用有一定的价值。