PN信号生成器的设计

Design on PN Signal Generator

CDMA2000由IS-95移动通信系统演进而来,它以网络分组交换技术为核心。基于MATLAB软件进行移动通信系统仿真设计的方法越来越受到人们的重视,也正在快速地取代传统的仿真设计方式。根据仿真结果分析系统性能,并且从中分离去影响系统性能的关键因素,找出最优的系统配置方案。最后构建CDMA2000通信系统中的PN功能模块,并且对整个模块进行仿真,此模块产生一个伪随机序列,对传输数据进行扰码和解码,以及用于直接序列扩频。

CDMA2000 develops from mobil communication system IS - 95. The design uses the software MATLAB primarily and supplies a visual simulink simulation model with it which can build and run the simulation model quickly. Analyzing the propertity of system, then getting key parameters which affect the system＇s propertity ,finding the optional project disposed of system, and last using the apply of simulink in the mobile communication according to the result from simulink has built PN function- models in the communcation system CDMA2000 and every model has been simulinked. The model generates a fake random sequence which can interrupt , decode the code in transmiting date, and apply in the spreading frequency dircct sequence.