基于自适应比特加载OFDM的白光LED音频通信系统研究

White LED Audio Communication System Based on Adaptive Bit Allocation OFDM

提出了一种可适用于室内低速的可见光音频通信系统(Visible Light Communication,VLC)。发射端光源为白光LED,使用智能移动终端的音频接口和高灵敏度的光电探测器(PIN)组成接收端,调制方式为自适应比特加载OFDM,自由空间传输距离1.2m,系统的单向总数据率达到22.37kbit/s。系统误码率(Bit Error Rate,BER)低于前向纠错码(Forward Error Correction,FEC)门限3.8×10^(-3)。该VLC系统使用的3.5mm耳机信道是几乎所有智能终端的一种标准接口,和智能终端兼容性高,而VLC作为室内宽带接入的一种方式,已受到越来越多的关注,实验结果表明,可见光音频通信将在智能移动终端领域获得潜在的应用。

In this paper,we proposed a low speed audio communication system using visible light which is suitable used in indoor communication. In the system,the unidirectional total data rate is 22. 37 kbit / s used OFDM Adaptive bit loading with BER under pre-FEC limit of 3. 8 × 10^（- 3）after 1. 2m free-space transmission,which have a white LED as a transmitter and the audio interface of smart mobile using a Highsensitivity Photodetectors（ PIN） as a receiver. The 3. 5mm headphone channel is a standard interface for all intelligent terminals with high compatibility,and VLC is a way of indoor broadband access,which has been received more and more attention. With this development,the 3. 5mm headphone channel based on VLC will be popular