摘要： 针对现有方法在大载波频偏条件下无法工作的问题，提出一种应用于国标数字电视系统DTMB系统的大载波频偏估计方法，利用国标系统中信号帧的结构特点，结合功率检测器，通过3个步骤完成载波频偏估计。与传统DTMB系统载波频偏估计方案相比，该方法具有更大的载波频偏估计范围。仿真结果表明，该方法在AWGN信道下最大可支持±400 kHz的载波频偏，在AWGN信道和多径信道下均满足系统要求。
关键词:
DTMB系统,
时域同步的正交频分复用调制技术,
功率检测
Abstract: Aiming at existing methods can not work under a large frequency offset, this paper proposes a carrier frequency offset estimation method for Digital Terrestrial Multimedia Broadcasting——DTMB system. It utilizes structural trait of signal frame in international system, employs power detection and three steps of estimation to complete the frequency offset estimation. Compared with traditional frequency estimation methods of DTMB system, the merit of proposed method works well under a large frequency offset. Simulation results indicate that the proposed method exhibits good performance under the situation of ±400 kHz carrier frequency offset in AWGN channel. It can completely satisfy the request of DTMB system in AWGN and multipath channels.
Key words:
DTMB system,
Time Domain Synchronous Orthogonal Frequency Division Multiplexing(TDS-OFDM) modulate technology,
power detection
中图分类号:
武建强;陈 赟;巫建明;张 阳;曾晓洋. 基于DTMB系统的大载波频偏估计方法[J]. 计算机工程, 2009, 35(13): 264-266,.
WU Jian-qiang; CHEN Yun; WU Jian-ming; ZHANG Yang; ZENG Xiao-yang. Big Carrier Frequency Offset Estimation Method Based on DTMB System[J]. Computer Engineering, 2009, 35(13): 264-266,.