OFDM时频捕获的联合算法

A Joint Time and Frequency Acquisition Algorithm for OFDM Systems

该文提出了一种OFDM时频捕获的联合算法:利用周期前缀的相关性实现符号粗同步和小数频偏的纠正,并在帧头符号插入差分导频可同时完成帧同步和整数频偏估计。在中短波信道的仿真结果验证了该算法的准确性和实用性。

A combined time and frequency acquisition algorithm for OFDM systems is derived in this paper. The proposed technique estimates the symbol beginning and the fractional frequency offset with the periodicity of Cyclic Prefix （CP）, and simultaneously achieves the frame synchronization and the integral frequency offset correction based on differential pilot subcarriers in the first symbol of a transmission frame. Simulation results in MW/SW channels indicate the accuracy and practicability of this approach.