基于无线可见光通信的双向语音对讲系统

A bi-directional voice intercom system based on wireless visible light communication

设计并实现了基于无线可见光通信(VLC)的双向语音对讲系统。上下行链路均使用普通的1 W发光二极管(LED)手电筒作为发射端光源,同时实现语音传输和照明功能。系统采用开关键控-非归零码(OOK-NRZ)调制方式,在测试LED的光电特性后,设计了LED驱动电路和接收电路;使用单片机控制音频编解码芯片实现语音信号的采集、处理和传输,通过异步收发传输接口(UART)进行数据传输,实现了最远通信距离为40m、最高传输速率为2.5Mbit/s的全双工实时语音对讲。本文系统实现复杂度低、成本低和功耗小,并可应用于其他数据传输场合,具有良好的实用性和广泛的适用性。

This paper designs and implements a bi-directional voice intercom system which is based on wireless visible light communication（VLC）.Using a common 1Wlight-emitting diode（LED）flashlight as the transmitted light source for uplink and downlink,we finally realize the function of voice transmitting and lighting at the same time.The system adopts on-off-keying and not-return-to-zero（OOK-NRZ）modulation mode to modulate the signal,which is easy to realize and does not cost much.We design the LED driver circuit and receiving circuit based on the measured LED photoelectric properties measured.The single-chip microcomputer controls the audio codec chip to realize voice signal acquisition,processing and transmission,and the voice data is transmitted through universal asynchronous receiver/transmitter（UART）interface.We realize a full-duplex and real time voice intercom system based on VLC with a maximum data rate of 2.5Mbit/s and the transmission distance is as far as 40 m.This system has a lot of advantages,such as low implementation complexity,low cost and low power consumption,and it can be applied in other data transmission situations,not only the voice intercom system.Therefore,we can arrive at the conclusion that it has good practicability and extensive applicability.