OFDM技术在GSM语音信道中的应用

Application of OFDM Technology in GSM Voice Channel

远距离数据传输以及数据传输的保密性向来是人们比较关注的问题,使用语音信道传输数据信息是一种可选的方案。利用GSM信道,结合OFDM技术,将电脑、手机、A/D、D/A组成一个系统,可以实现一种远距离数据传输平台。针对OFDM技术特点,实现了GSM语音信道OFDM调制解调系统,经过多次实验测试,平均误码率曲线表明设计达到了最初的设计要求,在话音保密数据通信及其他数据传输上有较好的应用前景。

Long-distance data transmission and the security of data transmission are always problems people are concerned about, and using voice channel for data transmission is an option. By using the GSM channel and adopting OFDM technology, a system composed of PC, mobile-phone, A/D converter and D/A converter can accomplish long-distance data transmission. Based on the technology characteristics of OFDM, the OFDM modulation and demodulation system of GSM voice channel is implemented. Through many experiments, the BER curve proves that the design achieves the original design requirements, and the system has good prospect in voice secure data communication and other kinds of data transmission.