频率选择性慢衰落信道下的快速频率估计

给出了在频率选择性慢衰落信道下适用于突发传输的两种快速频偏估计算法。针对慢衰落选择性信道下的频率估计问题，两种算法均给出了一个简单的闭式解，且算法实现无需任何信道幅度信息。第一种算法要求用于频率估计的训练序列的自相关矩阵具有对角特性，第二种算法使用周期的训练序列，两种算法所需的运算量大大低于最大似然估计算法。仿真结果显示，在较高信噪比下两种算法均具有较好的估计性能。

Fast Frequency Estimation in Frequency-Selective Slowly Fading Channels

This paper deals with frequency estimation for burst-mode transmissions in slowly fading frequency-selective channels.Two fast frequency offset estimators are derived for Rayleigh fading channel with additive white Gaussian noise.The first scheme requires a training sequence,which has diagonal autocorrelation matrices.The second scheme employs periodic training sequences.According to the algorithms,two simple,closed-form solutions to frequency estimation problem are provided without any knowledge of path amplitudes of the channels.The estimators are more computationally efficient than ML estimators while attaining good performance at moderate high signal-to-noise ratios.