一种基于OFDM技术的声波通信系统设计与实现

Acoustic communication system based on OFDM technology

随着手持移动设备的发展,近场通信的应用也越来越广。本文设计并实现了一种新型的基于OFDM技术的声波通信系统。在发送端,首先对传输数据进行差分编码,并加入同步信号和校准信号,然后依据OFDM技术将信号调制发送。在接收端,首先对接收信号做同步自相关处理获得起始数据帧位置,然后通过处理校准信号进行调制频率匹配校正,最后进行FFT变换解调出数据。通过对基于安卓平台实现的系统进行多种格式类型的文件传输实验表明,系统可以实现零误码的可靠数据通信。

With the development of handheld mobile devices, the application of near field communication has become more and more widespread. This paper designs and implements a new type of acoustic wave communication system based on OFDM. At the transmitting end, the transmission data is first differentially encoded, and the synchronization signal and the calibration signal are added, then the signal is modulated according to OFDM technology and finally transmitted . At the receiving end, the start data frame position is first obtained by performing synchronous autocorrelation processing on the received signal, and then the modulation frequency matching correction is performed by processing the calibration signal, and finally the FFT is used to demodulate the data. Experiments on multiple types of files' exchange on the Android platform show that the system can transfer data with zero error.