相位搜索法扩频码捕获的仿真实现  

Simulation of PN Code Acquisition based on Phase Search

作　　者：刘艳华[1] 

机构地区：[1]盐城工学院信息工程学院,江苏盐城224051

出　　处：《通信技术》2011年第12期147-149,共3页Communications Technology

摘　　要：扩频码同步是扩频通信系统中特别关键的技术,相位搜索法捕获是扩频码捕获中最基本的方法,硬件实现最简单,在短PN码捕获时有很大的优势。文中在MATLAB平台研究该捕获方法的实现,给出了整个同步过程的仿真模型,各部分的详细参数设置和关键部分的仿真结果。选择长度为31的PN码进行仿真,用5级移位寄存器产生本地PN码序列,不断调整其相位,直到本地PN码与接收的PN码序列初步对齐。仿真结果表明,该模型能够实现31位PN码的正确捕获。捕获时间与本地PN码和接收PN码之间的相位差有关。Spreading code synchronization is a critical technology in spread spectrum communication system, the PN code acquisition based on phase search is the most basic method, and it is quite simple in hardware implementation, and of superiority in short PN code acquisition. The implementation of this acquisition algorithm is studied on MATLAB, the simulation model of the whole synchronization process, the detailed parameters of each part and the simulation results of critical parts are also given. In simulation, the length of PN code is 31, local PN code sequence is generated with five shift registers. Continuous adjustment of the phase until the alignment of the local PN code and the received PN code sequence is done. Simulation results show that the model could capture PN code with length of 31 correctly, and the capture time depends on the difference between local PN code and received PN code.

关 键 词：扩频码 相位搜索 仿真 

分 类 号：TN914.42[电子电信—通信与信息系统]