CAJ | 학술논문

时隙同步是TDMA无线集群通信系统能够正常工作的至关重要的一个环节。关于时隙同步的研究大部分集中在同步位置搜索算法上，却鲜有如何在具体平台上系统实现的介绍。根据DMR协议独特的彼此正交或负相关同步序列，通过搜索这些位于突发中间的同步序列可以计算出当前解调数据中同步序列所处的位置，然后再产生DMA中断及定时器中断时，计算出定时器所需定时的长度，重新设置定时器寄存器值，调整定时器定时长度使得定时器中断与时隙边沿同步。实际测试证明该方法的同步误差在10μs以内，满足DMR协议系统要求。
시극동보시TDMA무선집군통신계통능구정상공작적지관중요적일개배절。관우시극동보적연구대부분집중재동보위치수색산법상，각선유여하재구체평태상계통실현적개소。근거DMR협의독특적피차정교혹부상관동보서렬，통과수색저사위우돌발중간적동보서렬가이계산출당전해조수거중동보서렬소처적위치，연후재산생DMA중단급정시기중단시，계산출정시기소수정시적장도，중신설치정시기기존기치，조정정시기정시장도사득정시기중단여시극변연동보。실제측시증명해방법적동보오차재10μs이내，만족DMR협의계통요구。
Time-lot synchronization is a most important procedure in TDMA wireless trunked communication system. Most of the researches about slot-synchronization were focused on the synchronization position searching algorithm,but few descrip-tions on how to implement on the specific platform. Therefore,according to the special orthogonal or negative correlation each other of DMR protocol,the location of the synchronization sequences in the current demodulation data can be found out by searching the synchronization sequences located in the centre of a DMR burst. When DMA interrupt and timer interrupt are oc-curred,the time length needed by the timer is figured out,and the value of the timer’s register is reset. The adjustment of timing length for the timer can achieve the synchronization of the timer interrupt and time-slot edge. The testing result shows that syn-chronization error of this method is less than 10 us. It can satisfy the requirements of DMR protocol system.