摘要： 在中国移动多媒体广播(CMMB)系统中，发送端的加扰使基于导频相关的整数倍载波频偏估计方法无法正常工作。针对该问题，提出一种适用于CMMB系统的整数倍载波频偏估计方法。利用CMMB帧结构中特有的同步信号进行整数倍载波频偏估计，避免发送端加扰对频偏估计的影响。仿真结果表明，该方法在低信噪比、高多普勒频偏的多径信道下仍具有良好的估计性能。
关键词:
中国移动多媒体广播标准,
同步信号,
整数倍载波频偏估计
Abstract: Due to the data scrambling in the transmitter, the conventional Integer carrier Frequency Offset(IFO) estimation method based on pilots correlation no longer works efficiently in China Mobile Multimedia Broadcasting(CMMB) system. In order to solve the problem, this paper proposes a new IFO estimation method for CMMB system. IFO is estimated with the synchronization signal which is a special part of CMMB frame structure. With the method, the influence on the carrier offset estimation caused by scrambling can be avoided. Simulation results show that even under multipath channel with low SNR and high Doppler frequency offset, the method still performs well.
Key words:
China Mobile Multimedia Broadcasting(CMMB) standard,
synchronization signal,
Integer carrier Frequency Offset(IFO) estimation
中图分类号:
邵楠, 陈赟, 李斯梦, 曾晓洋. CMMB系统的整数倍载波频偏估计方法[J]. 计算机工程, 2010, 36(17): 120-122.
SHAO Nan, CHEN Bin, LI Shi-Meng, CENG Xiao-Xiang. Integer Carrier Frequency Offset Estimation Method for China Mobile Multimedia Broadcasting System[J]. Computer Engineering, 2010, 36(17): 120-122.