基于DSP的短波通信系統設計IIR設計

電子機電論文編號:JD192      字數:14812,頁數:40

目錄
摘要......................................................................... 1
ABSTRACT......................................................................2
1 緒論 .......................................................................4
1.1 短波通信系統的發展現狀及趨勢 .............................................4
1.2 研究意義................................................................. 4
1.3 本文主要工作..............................................................5
2 數字濾波器 ................................................................ 6
2.1 數字濾波技術概述..........................................................6
2.2 MATLAB軟件介紹 ...........................................................7
2.3 數字濾波器及其MATLAB實現..................................................8
2.4 數字濾波器的設計要求和方法 ...............................................9
3 IIR數字濾波器設計 .........................................................11
3.1 典型的IIR數字濾波器的設計................................................11
3.1.1 模擬低通濾波器原型的設計 ..............................................13
3.1.2 模擬-數字濾波器變換....................................................18
3.1.3 頻帶變換...............................................................26
3.2 完全濾波器設計 ..........................................................29
3.2.1 常用函數及其應用 ......................................................29
3.2.2 幾種類型在低通濾波器設計中的比較.......................................33
3.2.3 幾種類型在高通濾波器設計中的比較.......................................34
3.3 直接法設計IIR濾波器......................................................38
3.4 小結 ....................................................................38
結論........................................................................ 40
致謝.........................................................................41
參考文獻.....................................................................42

摘要
在本文中，我們分別研究了在MATLAB環境下IIR數字濾波器的典型設計和完全設計等方法。典型設計是先按一定規則將給出的數字濾波器的技術指標轉換成模擬低通濾波器的技術指標，據此產生模擬濾波器原型，然后把模擬低通濾波器原型轉換成模擬低通，把模擬濾波器轉換成數字濾波器高通、帶通和帶阻濾波器，最后再把模擬濾波器轉換成數字濾波器。
完全設計方法中我們利用函數直接設計出低通、高通、帶通和帶阻濾波器，并分別用巴特沃斯( Butterworth )濾波器、切比雪夫( Chebyshev )濾波器、橢圓(Cauer)濾波器來實現，并比較了各自的頻率響應曲線。直接設計法中，我們利用MATLAB提供的yulewalk函數設計IIR濾波器。

關鍵詞:數字濾波器，完全設計法，典型設計法

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