Carrier synchronization method for digital terrestrial television system
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摘要: 根据数字电视地面广播传输系统国家标准的技术特点和帧结构,提出了一种基于PN (Pseudo Noise)帧同步头的载波同步算法.首先在帧头捕获之后,接收端本地产生和接收帧头相一致的PN序列,根据帧头中的前后两个子序列的相关结果进行频率估计并矫正频率偏差,再根据PN相关峰进行相位纠正.该载波同步方案适用于地面数字电视系统中的3种不同的帧头模式,并且适用于单载波和多载波两种模式的帧结构.进行了理论分析和计算,给出仿真结果和分析.该同步方案具有同步速度快、抗噪声性能好、适合硬件实现等特点,并已应用于数字电视接收机硬件系统中.Abstract: According to the technique characteristic and frame structure of the China national standard for digital television terrestrial broadcasting system, a carrier synchronization scheme based on the pseudo noise (PN) frame header was presented. After the acquisition of PN frame header, the same PN sequence was recovered at the receiver. Based on the sub-sequence correlation result, the frequency offset was first calculated, and then the phase error was corrected according to the correlation peak. This synchronization method suits three types of PN frame header of digital television (DTV) system, and suits both single carrier and multi-carrier structure. The theory of the algorithm was given and the simulation was performed. The result shows that this method has the superiority of fast synchronization, anti-noise and simple hardware design. This synchronization scheme has been used in the DTV receiver.
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[1] GB20600-2006,数字电视地面广播传输系统帧结构、信道编码和调制[S] GB20600-2006,Frame structure, channel coding and modulation for digital television terrestrial broadcasting system[S](in Chinese) [2] Moose P H. A technique for orthogonal frequency division multiplexing frequency offset correction [J]. IEEE Trans Comm, 1994, 42: 2908-2914 [3] Beek J J V D, Sandell M, Borjesson P O. ML estimation of timing and frequency offset in OFDM systems [J]. IEEE Trans SignalProc, 1999,45:1800-1805 [4] Schmidl T M, Cox D C. Robust frequency and timing synchronization for OFDM [J]. IEEE Trans Comm, 1997, 45:1613-1621 [5] Tufvesson F, Edfors O, Faulkner M. Time and frequency synchronization for OFDM using PN-sequence preambles //Proc VTC-99. 1999, 4:2203-2207 [6] Zheng Ziwei, Yang Zhixing, Pan Changyong, et al. Novel synchronization for TDS-OFDM based digital television terrestrial broadcast systems [J]. IEEE Trans On Broadcasting, 2004, 50 (2):148-153
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