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
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
CLC Number:
CHEN Xiu-Beng, CENG Xiao-Xiang. Optimal Synchronization Scheme for CMMB Receivers[J]. Computer Engineering, 2010, 36(21): 95-97.
陈秀平, 曾晓洋. CMMB接收机同步优化方案[J]. 计算机工程, 2010, 36(21): 95-97.