Robust Maximum Likelihood scheme for primary synchronization signal (PSS) detection and integer frequency offset (IFO) in Long Term Evolution (LTE) system has the best performance of cell search [5]. This scheme provides good synchronization performance based on correlation properties of Zadoff-Chu (ZC) sequences and reduced-rank representation of channel frequency response in multi-path propagation fading environment. The three ZC sequences used for PSS in LTE system cannot be said to have sufficient correlation properties in considering impact of symbol timing error. In this paper, we evaluate impact of the autocorrelation of PSS on PSS detection and IFO estimation and raise an issue of using other ZC sequence with better correlation properties. The simulation results show that PSS detection and IFO estimation performances are improved by using proposed ZC sequence.

长期演进（LTE）系统中用于主同步信号（PSS）检测和整数频率偏移（IFO）的鲁棒最大似然方案具有最佳的小区搜索性能[5]。该方案基于Zadoff-Chu（ZC）序列的相关属性以及在多径传播衰落环境中信道频率响应的降秩表示，可提供良好的同步性能。考虑到符号定时误差的影响，不能说用于LTE系统中的PSS的三个ZC序列具有足够的相关特性。在本文中，我们评估了PSS自相关对PSS检测和IFO估计的影响，并提出了使用其他具有更好相关特性的ZC序列的问题。