摘要： 针对中国移动多媒体广播系统对同步偏差非常敏感的特性，提出一种优化同步方案。该方案充分利用同步信号和离散导频的相关性，达到高精度、低复杂度的符号同步、频偏捕获以及频偏跟踪的目的。仿真结果表明，该同步方案在-2 dB SNR，300 Hz多谱勒的TU6信道下达到良好的同步捕捉、跟踪效果，频偏估计的均方根误差仅是传统算法的50%。

关键词: 中国移动多媒体广播, 载波频偏, 采样频偏, 正交频分复用, 同步

Abstract: This paper presents an optimum synchronization scheme aiming at the synchronization sensitivity of China Mobile Multimedia Broadcasting(CMMB). Utilizing the auto-correlation of preamble and scatter pilots, this scheme provides high-precision, low complexity symbol synchronization algorithm, frequency acquisition algorithms and frequency tracking algorithm. Simulation results indicate that proposed scheme performs robustly under TU6 channel with 300 Hz Doppler frequency shift at -2 dB SNR. Compared with the conventional scheme, the Root Mean Square Error(RMSE) of estimation is reduced by 50%.

Key words: China Mobile Multimedia Broadcasting(CMMB), carrier frequency offset, sampling frequency offset, Orthogonal Frequency Division Multiplexing(OFDM), synchronization

中图分类号: 

• N945