基于可见光通信的一对多视频广播系统

利用自主研发的软硬件搭建了基于可见光通信(VLC )的一对多视频广播系统。通过传输流(TS,transport stream)音视频数据流解决了通信信道 不可靠的问题,通过广播流量控制算法和控制指令的设计解决了多媒体数据广播传输时服务 器和客户端速率不匹配带来的超大缓存需求问题。可见光收发模块采用荧光型LED和PIN探测 器作为光源和探测器。系统拥有蜂窝网络结构,每个蜂窝可以有多个用户,客户可以同时接 收广播信号且不会相互干扰。通过实验实验证了系统的可行性。测试结果表明,本文系统支 持1对多的1080P视频数据光学无线广播传输,每个用户的接收带宽为 2Mbit/s,传输距离为2m。

A one-to-many video broadcast system based on visible light communication

This paper shows a design and implementation of multi-user video broadcast syst em based on visible light communication (VLC).The proposed system is implemented by combining the software and hardware design together.Transport stream (TS) da ta flow solves the problem of the unreliable characteristic of VLC channel.The design of control command and the flow control algorithm settles th e problem of continuous growth super buffer requirement,which is caused by the d ata rate mismatch between server and client in real-time multi-media video broadc ast syst em.The proposed system ultilizes the phosphorescent white light emitting diode ( LEDs) as the communicat ion power and PIN photodiode as the receiver detector.The VLC system has the ce llular network structure,and each cellular has several users,which can r eceive the multi-media video signal transmitted by VLC LEDs at the same time wi thout mutual interference.The experimental results show that the proposed multi -user video b roadcast system can support the 1090P video data broadcast with multi-users by using optical wireless communication,the data rate of each user is 2Mbit/s,and the free space transmission distance is 2m.