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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。
Spread-spectrum code synchronization is a key technology in spread-spectrum communication system. The phase-search method is the most basic method in DS code acquisition. It has the simplest hardware implementation and has great advantages in short PN code acquisition. In this paper, the realization of this acquisition method is studied on the MATLAB platform, and the simulation model of the whole synchronization process, the detailed parameter setting of each part and the simulation results of the key part are given. Select the length of 31 for the simulation of PN code, with 5 shift register to generate a local PN code sequence, and constantly adjust its phase until the local PN code received PN code sequence alignment. Simulation results show that the model can achieve the correct capture of 31-bit PN codes. The capture time is related to the phase difference between the local PN code and the received PN code.