Analysis of modulation and demodulation mode of voice signal in mine through-the-earth communicatio
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摘要: 根据不同调制解调方式特点，在考虑矿井透地通信信道特性的基础上，对二进制振幅键控、二进制频移键控、二进制差分相移键控等调制方式在不同解调方式下的误码率进行了仿真对比，结果表明：二进制频移键控相干解调方式具有一定的抗噪声和抗频率选择性衰落能力，可有效降低语音信号在传输过程中的误码率，提高透地通信的可靠性和准确性，更适合作为井下无线透地通信中语音信号的调制解调方式。Abstract: According to characteristics of various modulation and demodulation modes, bit error rate of modulation modes including binary amplitude shift keying, binary frequency shift keying and binary differential phase shift keying under different demodulation modes were simulated and compared on the basis of characteristics of mine through-the-earth communication channel. The results show that the binary frequency shift keying coherent demodulation mode can reduce the bit error rate in transmission process of voice signal effectively, and improve reliability and accuracy of the through-the-earth communication with certain ability to resist noise and frequency selective fading, which is more suitable for modulation and demodulation of voice signal in mine through-the-earth communication.
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