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为了提高CMMB系统广播信号接收同步精度,提出了一种使用CMMB信标进行载波和定时精确同步的算法。首先通过基于循环前缀的算法进行小数倍频偏估计和定时粗同步,再利用同步信号中伪随机序列的相关特性进行整数倍频偏估计和精确定时同步。仿真表明,在高斯白噪声下,CMMB系统同步算法的小数倍频偏性能与基于循环前缀的算法相当,但可以进行整数倍估计且定时精度高,在多径信道下,CMMB系统同步算法的估计精度优于基于循环前缀算法。实验结果验证了仿真的正确性。
In order to improve the synchronization accuracy of broadcast signal reception in CMMB system, an algorithm of carrier and timing synchronization using CMMB beacon is proposed. Firstly, fractional frequency offset estimation and rough timing synchronization are carried out based on the cyclic prefix algorithm, and then integer frequency offset estimation and precise timing synchronization are performed by utilizing the correlation characteristics of the pseudo-random sequence in the synchronization signal. The simulation shows that the CMMB system synchronization algorithm has the same performance of fractional frequency offset as the cyclic prefix based algorithm under Gaussian white noise, but it can estimate integer times and has high timing accuracy. Under the multipath channel, the CMMB system synchronization algorithm The estimation accuracy is better than that based on cyclic prefix algorithm. The experimental results verify the correctness of the simulation.