LTE系统中互相关主同步理论研究

Study on LTE primary synchronization theory based on cross-correlation structures

针对LTE系统主同步训练符号结构,提出了一种基于ZC序列的LTE互相关主同步算法。该算法分别对接收信号进行整数倍频偏估计、符号定时估计、小数倍频偏估计;为了提高同步的精度以及系统在低信噪比下的同步性能,采用分段互相关和具有完美自相关性能的ZC序列,并能根据实际信道环境进行复杂度和同步精度的灵活选择。仿真结果表明,该算法同步性能较传统延迟相关算法SNR性能提高了6～9 dB。

A LTE primary synchronization algorithm based on ZC（Zadoff-Chu） sequence and cross-correlation is presented.The method provides integer frequency offset estimation,symbol timing estimation and fine frequency estimation,respectively.In order to improve the accuracy of synchronization and the system performance in low SNR（Signal Noise Ratio）situation,hence,M-part cross-correlation summation and ZC sequence is used to help cross-correlation based detectors to achieve good performance.Simulation results show that the presented method can lead to performance enhancement by 6～9 dB than the traditional delay-correlation algorithm.