高效率高精度的OFDM载波频率捕获和信道估计算法

High Efficient and Precise OFDM Carrier Frequency Acquisition and Channel Estimation Algorithms

实现简单、精度高的载波频率捕获和信道估计算法是OFDM研究的重点。本文根据OFDM系统特点,分析了OFDM系统的时域载波频率捕获和信道估计方法。提出使用同一种辅助数据帧,利用两种不同的算法,进行载波频率捕获和信道估计的思想。这种算法提高了系统的频谱利用率,同时也具有容易实现的特点。仿真结果表明,算法具有不受定时误差影响,精度较高,计算量较少等优点。

Carrier frequency acquisition and channel estimation algorithms with easy deployment and high precision are always the most challenging areas in OFDM. We propose new carrier frequency acquisition and channel estimation algorithms based on the time-domain analysis of OFDM system. The algorithms can finish carrier frequency acquisition and channel estimation in one training sequence, which improves the spectrum efficiency and usability. The simulation results show that the new algorithms are immune from the timing error with a high precision and low computation cost.