一种实现下行同步序列快速搜索的新方法  

A new method for downlink synchronization sequence fast searching

作　　者：何维[1] 刘永康[1] 陈国平[1] 田增山[1] 

机构地区：[1]重庆邮电大学无线定位与空间测量研究所,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2012年第1期64-68,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：重庆市科委科技攻关项目(CSTC2008AC2073);重庆市教委科研项目(KJ100520)~~

摘　　要：针对无线通信系统中下行同步序列(summarized the existing downlink synchronization sequence,SYNC_DL)的搜索方法和对其计算复杂度方面存在的问题进行了分析。结合系统帧结构的特点,设计了一种基于逻辑特征窗的低复杂度SYNC_DL搜索方法,该方法通过逻辑特征窗的设置,将大量的数值计算转化为逻辑运算,从而减少了计算量。数值仿真结果表明,与传统方法相比,该方法在高信噪比环境下能更有效地进行下行同步序列的搜索,但在低信噪比环境下,该方法的正确率会明显降低。In this paper,we summarized the existing downlink synchronization sequence（SYNC_DL）searching methods in wireless communication system and analyzed the problem of computational complexity.According to the characteristics of the system frame structure,a kind of SYNC_DL searching scheme based on the logical characteristic window which can reduce the computational complexity is designed.By setting logical characteristic window,this method transforms mass numerical computation into logical computation which can reduce the computational complexity.The simulation results reveal that this method can complete downlink synchronization sequence searching more efficiently than traditional methods in high SNR environment,but the success ratio will decline obviously in low SNR environment.

关 键 词：下行同步序列搜索 帧结构 逻辑特征窗 

分 类 号：TN929.53[电子电信—通信与信息系统]