矿井移动通信系统中的一种位同步方案

Design of bit-sync in the mine mobile communication system

针对矿井通信设备的特殊要求,利用收发信机控制器的定时器模拟数字锁相环来实现位同步,有效地简化了硬件设计,代价只是在每个时隙的信令或语音数据之前加一个方波序列作为位同步,经过位同步序列的调整,使其后的数据在电平的中央被控制器采样,以保证数据正确,根据TDD方式下通信系统对钟频率稳定度的要求,计算并确定了基站和移动台的晶振精度。

According to the character of underground communication equipment, the bit-sync is realized by the digital phase locked loop simulated by the timer in the transceiver controller. It simplifies the design of the hardware of the system. The only price that has to be paid is to add a sequence of square waves in front of the signaling or voice data at every slot. To ensure the accuracy of the data, the data following the preamble is sampled in the middle by adjusting the bit-sync preamble. Besides, according to the demands of the frequency stability of the TDD system, the accuracy of oscillator is calculated and set both for the base station and mobile phone.