摘要
由于SFN信道的强回波特性，SFN系统中的DVB-T OFDM接收机需要更为精确的频率同步保证信号的正确解调。本文在SFN系统中，提出一种OFDM频域全导频频偏估计算法，该算法基于符号中的全导频（包括连续导频和散布导频）估计整偏和细小偏；同时给出了频域小环校正整偏的结构，理论分析和仿真结果说明，该算法较传统的连续导频频偏估计算法提高了估计精度，更适合强回波的SFN信道,提出的整偏小环校正结构加快了频率同步的收敛速度。
For strong echoes in SFN channel, DVB-T OFDM receiver in SFN system requires more accurate frequency synchronization strategy to achieve correct demodulation. Firstly, a frequency-offset estimate algorithm based on all pilots is proposed for SFN OFDM. Continual pilots （CP） and scattered pilots （SP） arc both used to estimate the ＂integral＂ and ＂fractional＂ frequency-offsets. The proposed algorithm estimates frequency-offset more accurately than the conventional algorithm only using CP, so the proposed all-pilots algorithm suits SFN better. Secondly, a new synchronization structure using short loop in frequency domain for ＂integral＂ frequency-offset correction is proposed, which can quicken the frequency convergence.
出处
《通讯和计算机（中英文版）》
2005年第8期73-77,共5页
Journal of Communication and Computer
基金
本文得到国家自然科学基金重大研究项目（N0.60496316）的资助,
