一种改进的适用于分组传输的OFDM频偏估计方法

摘要

An improved training symbol-based method for frequency offset estimation is proposed. Both the training symboland the cyclic prefix are used to obtain the fine frequency offset estimation in time domain, and the coarse frequency offsetestimation is accomplished in frequency domain by peak detection. Simulation results show that in multipath fading channel,the frequency offset estimation accuracy is improved significantly while the estimation range is enlarged to the overall signalbandwidth. Meanwhile, the residual frequency offset can be restricted within 2% of the subcarrier spacing, if SNR reaches12dB.%提出了一种改进的基于训练符号的频偏估计方法.该方法通过综合利用训练符号和循环前缀的信息得到时域的细频偏估计,通过峰值检测得到频域的粗频偏估计.仿真结果表明,在多径衰落信道下,在频偏估计范围达到整个信号带宽的同时,本算法的估计精度也有了明显的提高,并且当信噪比达到12dB时,可以使剩余频偏限制在子载波间隔的2％以内.