LTE同步技术频偏估计理论研究

Research on LTE Synchronous Frequency Offset Estimation

针对LTE系统中的OFDM同步技术进行研究,对比不同频偏估计算法的性能,包括传统的基于CP频偏估计算法以及基于PSS频偏估计算法,并依据传统的基于CP频偏估计算法的特点,选取保护间隔1/4的相关窗,在相关窗内进行共轭相关再取平均值的方法对该算法进行改进。仿真结果表明,与传统CP算法相比,改进CP算法的均方误差降低了3个数量级。

Using algorithms based on CP frequency offset estimation and PSS frequency offset estimation,OFDM synchronization of LTE system is studied and the two algorithms are compared.According to the characteristics of the traditional algorithm based on CP frequency offset estimation algorithm,protection interval is selected as a quarter of the relevant window,and then is conjugate within the relevant window,finally the algorithm is improved by calculating the average value.Simulation results show that compared with the traditional CP algorithm,the performance of the improved CP algorithm reduces the mean square error by two orders of magnitude.