基于可见光的光收发系统设计.docVIP

文章编号 基于可见光的光通信系统设计 张锋博 （西安邮电大学 电子工程学院，陕西 西安 摘 要：目前应用的通信系统主要有无线通信系统和有线通信系统两种，可见光通信是一项新兴基于白光LED的无线光通信技术，具有发射功率高、不占用无线电频谱、无电磁干扰、无电磁辐射和节约能源等优点，能够同时实现照明和通信的双重功能。只要方法是以可见光作为信号传输载波，设计完整的光收发电路，实现信号的发射和接收功能。设计的电路要求能够稳定准确地发射并接收信号，并且可以传输一定的距离而不失真。实验结果表明：发射机和接收机的之间随着距离的增加，接收到的信号噪声增大，失真增多，理论上的短距离内信号均可以无失真传输。 关键词：可见光通信系统 发射机 接收机 噪声 载波 中图分类号：TN914.3 文献标识码：A Based on the visible light communication system design ZHANG Feng-bo （Xian University of Posts and Telecommunications, Electronic Engineering, ,Xi’an） Abstract: The current application of the communication system are mainly two kinds of wireless communication system and a wired communication system The visible light communication (VLC) utilizing the white LEDs is a kind of optical wireless communication characterized by high emission power rate, dont take up radio spectrum, no electromagnet interference, no electromagnetic radiation and energy-saving, etc. In VLC system, white LEDs are used not only as the illuminator in the rooms, but also as the source of the communication system. As long as the method is based on the visible light as a signal transmission carrier, the design integrity of the optical transceiver circuit, the signal transmitting and receiving functions. The design requirements of the circuit can be stably and accurately emitting and receiving signals, and a certain distance can be transmitted without distortion. Experimental results show that: the increase of the distance between a transmitter and a receiver, the received signal to noise increases, the distortion is increased, within a short distance signal theoretically can be lossless transmission. Key words: visible light communication system transmitter receiver noise carrier 1 引言 光通信分为有线光通信和无线光通信两种。光通信的主要方式是有线光通信即光纤通信，它已成为广域网、城域网的主要传输方式之一。 无线光通信又被称为自由空间光通信(FSO，Free Space Optical communication)。近年来，随着“最后一公里”对高带宽、低成本接入技术的迫切需求，FSO在视距传输、宽带接入中有了新的发展机遇，同时由于光通信器件制造技术的飞速发展，无线光通信设备的制造成本大幅下降，FSO得到越来越多的应用。 包括发射机与接收机两个部分组成。系统所用的基本技术是光