扩频通信系统中的成形滤波器的一种设计方法

A Design of Shaping Filter in Spread Spectrum Communication System

提出了无线扩频通信系统中成形滤波器的一种新的设计方法。首先分析了无线扩频通信系统最佳接收对滤波器的要求以及设计该滤波器的三个主要参数,然后介绍了所提出的无线扩频通信系统基带部分中的成形滤波器设计的改进方法,该方法采用升余弦滚降特性作为系统总体频率特性,并且在不同的参数条件下分析了它的滤波性能,最后选择了一组参数在FPGA上加以实现。实验结果表明,该成形滤波器可以很好的完成扩频通信中的成形特性。

Proposing a new method of designing the shaping filter in wireless spread spectrum communica- tion system, first we discuss the request of shaping filter for best receiveing and the three main parameters of this filter,then we introduce a improved method of the design of shaping filter in baseband of wireless spread spectrum communication system. This method uses the characteristics of raised-cosine roll-off as the frequency characteristic of the whole system, and we analyze its filter performance under different con- ditions with various parameters. At last we choose a group of parameters to implement on FPGA. Experi- mental results show that this shaping filter works well in wireless spread spectrum communication system.