关键词: 载波频率偏移, 数字地面广播电视, 全相位正交频分复用, 自相关帧同步算法

Abstract: In this paper，a novel frame synchronization technique，which is robust to Carrier Frequency Offset（CFO），is proposed for Digital Terrestrial Multimedia/television Broadcasting（DTMB） systems.This technique is derived through using the copy signal of Orthogonal Frequency Division Multiplexing（OFDM） system in time domain and performing autocorrelation of the received signal.The metric for peak detection is defined as the non-coherent summation of the autocorrelation magnitude outputs.It is shown through computer simulation that the proposed techniques generally outperform the conventional ones when CFO occurs，over frequency-selective fading channels.For a DTMB system using PN420 mode，the maximal allowed CFO to keep system still working normally of the proposed scheme is larger than that of the conventional method.

Key words: Carrier Frequency Offset（CFO）, Digital Terrestrial Multimedia/television Broadcasting（DTMB）, All phase Orthogonal Frequency Division Multiplexing（OFDM）, auto-correlation frame synchronization