矿井透地通信系统中的定时同步研究

摘要

The paper researched timing synchronization of mine through-the-earth communication system. It built a simple elastic wave medium model of earth channel firstly and obtained multi-path delay of the model is 20 ms through calculation. Then it simulated, analyzed and compared application performances of data auxiliary timing synchronization method and non data auxiliary timing synchronization method in the through-the-earth communication system by use of Matlab, and got following conclusions: the non data auxiliary timing synchronization method requires high signal power of the through-the-earth communication system, and the data auxiliary timing synchronization method has higher reliability and is fitter for the through-the-earth communication system. Finally, it simulated decoding error rate of the through-the-earth communication system which used the data auxiliary timing synchronization method under the condition that length of cyclic prefix of OFDM was 0.5, 2, 4 times of the maximum delay time separately and SNR was from 0 dB to 18 dB. The simulation result showed that the decoding error rate of the through-the earth communication system achieves 10~5 order of magnitude when the length of cyclic prefix of OFDM is above 2 times of the maximum delay time and the SNR is above 16 dB, which verifies application reliability of the data auxiliary timing synchronization method in the through-the-earthcommunication system.%对矿井透地通信系统中的定时同步问题进行了研究.首先以大地信道为对象构建了简单的弹性波介质模型,计算得到该模型的多径延时为20 ms；其次在Matlab环境中仿真并对比分析了非数据辅助定时定时同步方法和数据辅助定时同步方法在透地通信系统定时同步应用中的性能,得出非数据辅助定时同步方法对透地通信系统的信号功率要求较高、数据辅助定时同步方法具有较高可靠性且更适合透地通信系统的结论；最后对采用数据辅助定时同步方法,当OFDM信号的循环前缀长度分别为最大时延的0.5倍、2倍、4倍,信噪比为0～18 dB的透地通信系统解码误码率进行了仿真研究,结果表明,当OFDM信号的循环前缀长度大于最大时延的2倍、信噪比大于16 dB时,透地通信系统的解码误码率可迭10-5数量级,从而验证了数据辅助定时同步方法应用于透地通信系统同步解码时的可靠性.