摘要
通过对无人机正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统时频同步方法分析,对最大似然准则、最大相关准则和基于循环移位的最大相关算法等3种同步算法进行了研究。针对无人机数据链OFDM系统同步传输的特性,提出了一种采用粗同步和细同步相结合的时频联合同步方法。通过仿真结果可以得出,该时频联合同步方法能够达到系统同步范围和同步精度的统一。
Through an analysis on the time and frequency synchronization method of UAV OFDM system,the maximum likelihood criterion,the maximum relativity criterion and the maximum relativity algorithm based on cyclic shift are studied.Based on the characteristics of synchronous transmission of UAV data link OFDM system,a time and frequency joint synchronization method is proposed which combines coarse and fine synchronization.The simulation results indicate that the synchronization range and accuracy of the system can be unified through the time and frequency joint synchronization method.
出处
《无线电工程》
2012年第3期17-20,共4页
Radio Engineering
关键词
无人机
OFDM系统
时频联合
同步算法
unmanned aerial vehicle
OFDM system
time ＆ frequency
synchronization algorithm
