基于变换域的OFDM系统最大多普勒频移估计算法  

A Maximum Doppler Frequency Estimation Algorithm in OFDM System Based on Transform Field

作　　者：陈家旺[1] 邓平[1] 

机构地区：[1]西南交通大学信息编码与传输重点实验室,成都610031

出　　处：《兰州交通大学学报》2009年第3期83-86,共4页Journal of Lanzhou Jiaotong University

摘　　要：在OFDM系统中,影响其性能的一个重要参数就是最大多普勒频移.本文根据功率谱估计原理,首先通过对接收到的含有最大多普勒频移(fm)信息的导频信号进行快速傅立叶变换(FFT),再利用衰落信道功率谱的分布来估计出最大多普勒频移信息.仿真结果表明,此方法可以有效地估计多普勒频移,并且具有实现简单和受噪声影响小的优点.The maximum Doppler frequency shift is an important parameter which affects the performance of the OFDM system. Based on the theory of power spectrum estimation,this paper firstly makes a fast Fourier transform （FFT） to the received pilot signals which are related with the maximum Doppler frequency, then estimates the maximum Doppler frequency information by the distribution of fading channel power spectrum. Simulation results show that this method can estimate the maximum Doppler frequency accurately and effectively. Meanwhile it can be easily implemented and the noise has little influence on it.

关 键 词：OFDM 最大多普勒频移 变换域 

分 类 号：TN929.5[电子电信—通信与信息系统]