基于频偏补偿的TDS-OFDM系统同步方法  

Synchronization algorithm for TDS-OFDM systems using frequency offset compensation

作　　者：龚国强[1] 葛万成[1] 

机构地区：[1]同济大学中德学院,上海200092

出　　处：《系统工程与电子技术》2010年第12期2511-2515,共5页Systems Engineering and Electronics

摘　　要：针对TDS-OFDM系统中载波频偏对基于PN序列自相关同步算法的影响,提出采用双滑动窗互相关的时间标尺函数来进行符号同步,利用该函数可以得到很好的相关峰值且不受频率偏移的影响。载波频偏由多径信道下各主要能量径的相关峰值估计得到,该估计算法可以得到较为准确的估计值和较大的估计范围。在典型的城市信道条件下对算法进行了仿真,结果表明:在较大的频偏条件下,本文方法得到了准确的符号同步和较好的频偏估计。Since the synchronization algorithm based on the auto-correlation of pseudo-noise（PN） sequences for time-domain synchronization（TDS） orthogonal frequency division multiplexing（OFDM） systems is affected by the carrier frequency offset,a time metric function adopting the correlation of two sliding windows is proposed for signal synchronization.By using the function,well correlation peak values can be obtained and could not be affected by frequency offsets.Carrier frequency offsets are estimated by the peak values of main power paths in the multi-path channel,the proposed algorithm can get comparatively accurate estimated values and wide estimated ranges.Simulation results in the typical city channel show that the proposed algorithm gets exact signal synchronization and comparatively accurate frequency estimated values while having quite big frequency offsets.

关 键 词：正交频分复用 符号同步 频率偏移 补偿 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]