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DMR通信协议是一种可适用于数字对讲机系统的新型通信协议。为了能够对基于DMR通信协议的数字对讲机系统的载波恢复提供一种可行性方案,文中针对DMR通信系统中的载波恢复部分进行了研究,设计采用基于软件无线电的梯度算法。在Matlab下进行了仿真,能得到很好的仿真效果;并将其应用于实际项目中,效果良好。结果表明:采用梯度算法,可以很好地实现DMR系统载波的频率估计和相位估计。
DMR communication protocol is a new communication protocol applicable to digital walkie-talkie systems. In order to be able to provide a feasible solution to carrier recovery of DECT communication system based on DMR communication protocol, the carrier recovery part in DMR communication system is studied in this paper. A gradient algorithm based on software radio is designed. Under the Matlab simulation, can get a good simulation; and its application in the actual project, the effect is good. The results show that using gradient algorithm, the frequency estimation and phase estimation of DMR system carrier can be well achieved.