基于DSP的短波通信系统设计IIR设计

电子机电论文编号:JD192      字数:14812,页数:40

目录
摘要......................................................................... 1
ABSTRACT......................................................................2
1 绪论 .......................................................................4
1.1 短波通信系统的发展现状及趋势 .............................................4
1.2 研究意义................................................................. 4
1.3 本文主要工作..............................................................5
2 数字滤波器 ................................................................ 6
2.1 数字滤波技术概述..........................................................6
2.2 MATLAB软件介绍 ...........................................................7
2.3 数字滤波器及其MATLAB实现..................................................8
2.4 数字滤波器的设计要求和方法 ...............................................9
3 IIR数字滤波器设计 .........................................................11
3.1 典型的IIR数字滤波器的设计................................................11
3.1.1 模拟低通滤波器原型的设计 ..............................................13
3.1.2 模拟-数字滤波器变换....................................................18
3.1.3 频带变换...............................................................26
3.2 完全滤波器设计 ..........................................................29
3.2.1 常用函数及其应用 ......................................................29
3.2.2 几种类型在低通滤波器设计中的比较.......................................33
3.2.3 几种类型在高通滤波器设计中的比较.......................................34
3.3 直接法设计IIR滤波器......................................................38
3.4 小结 ....................................................................38
结论........................................................................ 40
致谢.........................................................................41
参考文献.....................................................................42

摘要
在本文中，我们分别研究了在MATLAB环境下IIR数字滤波器的典型设计和完全设计等方法。典型设计是先按一定规则将给出的数字滤波器的技术指标转换成模拟低通滤波器的技术指标，据此产生模拟滤波器原型，然后把模拟低通滤波器原型转换成模拟低通，把模拟滤波器转换成数字滤波器高通、带通和带阻滤波器，最后再把模拟滤波器转换成数字滤波器。
完全设计方法中我们利用函数直接设计出低通、高通、带通和带阻滤波器，并分别用巴特沃斯( Butterworth )滤波器、切比雪夫( Chebyshev )滤波器、椭圆(Cauer)滤波器来实现，并比较了各自的频率响应曲线。直接设计法中，我们利用MATLAB提供的yulewalk函数设计IIR滤波器。

关键词:数字滤波器，完全设计法，典型设计法

ABSTRACT
In this thesis, the typical and complete designs under MATLAB are studied. The　typical design gets the technical parameters from digital filters that should be designed, and then transformed into the analog parameters of a low-pass analog filter prototype. The prototype is converted into the analog low-pass, high-pass, band-pass and the band-stop filters respectively, which are transformed into the digital ones.
The complete design uses the given functions and releases the low-pass, high-pass, band-pass and the band-stop filters directly. Butterworth, Chebyshev and Cauer filters are used for the implementations. And each from of frequency respond to the curve are compared.In the direct design method, we make use of the yulewalk function  design  IIR filter that MATLAB provide.
Key Words: digital filter, typical design, complete design