一种基于频域相关实现OFDM时频同步的方法
OFDM Time and Frequency Synchronization Based on Frequency Domain Correlation
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摘要: 该文根据频域相关的原理，提出了一种新的用于无线移动信道下的正交频分复用(OFDM)系统的时频同步算法。该算法能够同时实现时间同步与频偏估计。该算法设计了一个长为一个OFDM信元的前缀信元，使用在频率域相关的方法来实现初始时间同步。该算法利用时间同步的相关结果以及匹配相关的原理实现初始频偏估计，并且能够将初始频偏估计的估计范围扩展到整个OFDM的系统带宽。仿真结果表明，在高斯信道与衰落信道下，该算法具有良好时频同步性能。
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关键词:
- OFDM;时间同步;频偏估计
Abstract: A new time and frequency synchronization method based on frequency domain correlation for an Orthogonal Frequency Division Multiplexing (OFDM) system is presented. The time synchronization and carrier frequency offset estimation can be achieved simultaneously. The algorithms described here use one training sequence of just one symbol and the design of the symbol is presented. The carrier offset estimation can be got by the correlation result of time synchronization and the frequency synchronization algorithm can extend the frequency acquisition range to nearly the whole useful OFDM signal bandwidth. The efficacy of the synchronization algorithms is demonstrated experimentally. -
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