LTE系统中一种串行的整数倍频偏和扇区检测算法

A Serial Integer Carrier Frequency Offset and Sector Detection Algorithm in LTE Systems

在LTE系统中,用户终端(UE)在开机后首先会进行小区搜索。针对传统的小区搜索方案中整数倍载波频偏(ICFO)和扇区ID是通过利用主同步信号(PSS)进行联合检测这一问题,提出了一种串行的整数倍频偏和扇区ID估计算法。该算法利用PSS的对称性,将ICFO和扇区ID进行分开检测,通过对接收的频域PSS进行归一化差分相关,消除了信道的影响,从而增强了检测性能。将联合估计算法和提出的串行估计算法进行仿真对比,结果表明提出的算法相较于传统方法可以取得更好的检测精度,并且运算复杂度仅为传统方法的1/3。

In LTE systems,user equipment,when it is booted,will perform a cell search firstly. For the conventional cell search scheme,the integer carrier frequency offset（ICFO） and sector identity（ID） are jointlydetected by utilizing the primary synchronization signal（PSS）. For this problem,this paper proposes a serialinteger carrier frequency offset and sector ID algorithm. This algorithm makes use of the symmetry of theprimary synchronization signal（PSS） and detects the ICFO and sector ID separately. Through normalizeddifferential correlation of the received frequency domain PSS,the effect of channel is eliminated,therebyenhancing detection performance. Simulation comparison between the joint estimation algorithm and theproposed serial algorithm shows that the proposed algorithm can achieve better detection accuracy and thecomputational complexity is only 1 / 3 of that of conventional method.