基于DSP的DMR终端时隙同步设计与实现  

Design and implementation of time-slot synchronization for DMR terminal based on DSP

作　　者：王冬海 杨青山 胡汉武 

机构地区：[1]广州海格通信集团股份有限公司,广东广州510663

出　　处：《现代电子技术》2014年第16期28-29,33,共3页Modern Electronics Technique

摘　　要：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。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.

关 键 词：DMA DMR TDMA 时隙同步 

分 类 号：TN929.533[电子电信—通信与信息系统]