一种高动态环境下频偏粗估改进算法研究  

A Modified Coarse Frequency Offset Estimation Algorithm in Highly Dynamic Environment

作　　者：王雅慧[1] 叶展 郭道省[1] 杨晗竹 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《通信技术》2016年第1期24-28,共5页Communications Technology

摘　　要：针对高动态环境下信号传输存在大频偏以及频率变化率的问题,在分段累加FFT算法的基础上提出了新的算法。该算法首先对接收数据进行分组,然后分别对每组数据的频偏及其变化率采用传统分段累加FFT算法进行粗估计,再将得到的粗估值补偿到对应的数据段中,在此基础上进行下一步的细同步估计。仿真结果表明,新算法的估计精度提高了近50%,对于高动态环境下的频偏估计具有一定的适用性。Aiming at the Doppler shift even frequency acceleration and high order acceleration resulted from high-speed movement, an optimized method, based on the accumulation of FFT algorithm in frequency es- timating under high dynamic environment is proposed. Firstly, the algorithm divides the received data into groups, and then the frequency-offset of each group is estimated by using accunmlation FFT algorithm. The experimental results show that this modified algorithm could acquire a fairly high accuracy of about 50% in estimating frequency-offset, and this is quite applicable for frequency-offset estimation in highly dynamic environment.

关 键 词：高动态 粗估计 FFT 

分 类 号：TN927.2[电子电信—通信与信息系统]