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本科畢業(yè)論文(設(shè)計(jì)、創(chuàng)作) 題 目: 基于 LMS 算法的自適應(yīng)濾波器設(shè)計(jì)與實(shí)現(xiàn) 學(xué)生姓名: 學(xué)號: 0231002020 所在系院: 信息與通信技術(shù)系 專業(yè): 電子信息工程 入學(xué)時(shí)間: 2020 年 9 月 導(dǎo)師姓名: 職稱 /學(xué)位: 講師 /博士 導(dǎo)師所在單位: 完成時(shí)間: 2020 年 5 月 安徽三聯(lián)學(xué)院教務(wù)處 制 安徽三聯(lián)學(xué)院畢業(yè)論文 1基于 LMS 算法的自適應(yīng)濾波器設(shè)計(jì)與實(shí)現(xiàn) 摘 要: 自適應(yīng)濾波器是信號處理技術(shù)的幾大主要組成部分之一,在現(xiàn)實(shí)運(yùn)用當(dāng)中,使用擁有固定系數(shù)的數(shù)字濾波器有一定的限制條件,即需要知道大量關(guān)于輸入信號的信息,所以我們需要研究自適應(yīng)濾波器以改變自適應(yīng)濾波器使用受限制的這一情況。在各種各樣的實(shí)際運(yùn)用環(huán)境中,自適應(yīng)濾波 器均可以為各種條件下的信號處理提供一種十分簡潔有效的解決方法,并且在各種復(fù)雜的環(huán)境中它的性能通常比用普通方法設(shè)計(jì)的固定濾波器好。另外,它還擁有其非他自適應(yīng)方法所不具備的與眾不同的信號處理能力。 本文首先通過對自適應(yīng)算法的研究與分析,并且用該算法簡單的 MATLAB 仿真 LMS。其次通過自適應(yīng)濾波器在 MATLAB 軟件中利用其特性和工作原理對噪聲信號的干擾信號進(jìn)行簡單的濾波模擬仿真操作(是以 C 語言為基礎(chǔ)的程序來仿真),并對程序運(yùn)行結(jié)果進(jìn)行一定程度地比較、分析,在此基礎(chǔ)上進(jìn)一步探索和升華。根據(jù)最小均方算法( LMS 算法 )的特點(diǎn) ,我們可以在 MATLAB 環(huán)境中進(jìn)行有限長度的基于 LMS 算法自適應(yīng)濾波器的軟件程序編寫,讓受白噪音滋擾的語音信號和正弦波信號在根據(jù)現(xiàn)實(shí)情況要求所設(shè)計(jì)的自適應(yīng)濾波器中進(jìn)行濾波實(shí)驗(yàn)。理論剖析和仿真實(shí)驗(yàn)結(jié)果闡明 ,根據(jù)現(xiàn)實(shí)要求所設(shè)計(jì)的自適應(yīng)濾波器擁有跟蹤學(xué)習(xí)能力迅速、收斂性能好、穩(wěn)態(tài)誤差小等優(yōu)點(diǎn)。 關(guān)鍵詞: LMS 算法; 自適應(yīng)濾波器; MATLAB 安徽三聯(lián)學(xué)院畢業(yè)論文 2Design and implementation of Selfadapting Filter Based on LMS Abstract: Adaptive filter is one of the main ponents of statistical signal. In the reality , since there is no enough information to design digital filter of fixed coefficient ,so we must to research the selfadapting filter .As long as it is in the need to deal with unknown statistical environment to run the results generated by the signal or to deal with the nonstationary signal adaptive filter can provide a very simple solution ,and its performance is usually better than the fixed filter designed by ordinary method .In addition ,the adaptive filter can also provide the adaptive method cannot provide a new signal processing ability. First of all, by means of researching and analysis of the selfadapting filter, and make use of the MATLAB emulation of the algorithm is simple LMS. And then use MATLAB to noise signal processing in the LMS adaptive filter for simulation and analysis. .According to the characteristics of LMS algorithm in MATLAB environment based on LMS adaptive filter algorithm of finite length of writing ,let the white noise nuisance of speech signal and the sine wave signal according to the requirements on the design of the adaptive filter for filtering experiment. Theory analysis and the simulation results to clarify that, according to the requirements for the design of adaptive filter has many advantages ,such as tracking ability quickly, good convergence performance and small steadystate error. Keywords: LMS Arithmetic; Selfadapting Filter; MATLAB 安徽三聯(lián)學(xué)院畢業(yè)論文 I 目錄 第一章 緒論 ......................................................... 1 研究背景及意義 ..................................................... 1 研究現(xiàn)狀 .......................................................... 1 研究內(nèi)容 .......................................................... 3 第二章 LMS自適應(yīng)濾波器工作原理 ........................................ 4 自適應(yīng)的定義 ....................................................... 4 自適應(yīng)濾波器的結(jié)構(gòu)劃分及其分類 .................................... 4 自適應(yīng)濾波器的原理 ............................................... 5 自適應(yīng)濾波器算法的基本過程 ........................................ 6 線性離散時(shí)間濾波器的約束條件 ....................................... 6 第三章