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信號與系統(tǒng) 讀者對象:本書可作為通信工程、電子信息工程、電子信息科學(xué)與技術(shù)等電子信息類專業(yè)的本科生教材。提供了多學(xué)時(shí)配置方案,可滿足不同專業(yè)的不同需求,也可供研究生和有關(guān)科技工作者參考。
本書是工信部“十四五”規(guī)劃教材,闡述了信號與系統(tǒng)的基本概念、核心原理和實(shí)用方法,主要包括連續(xù)時(shí)間與離散時(shí)間信號與系統(tǒng)的時(shí)域分析、頻域分析、s 域分析、z 域分析、狀態(tài)方程與 MIMO 系統(tǒng)等。本書在內(nèi)容闡述上加強(qiáng)離散時(shí)間系統(tǒng)的分析,揭示連續(xù)時(shí)間與離散時(shí)間系統(tǒng)的相互關(guān)系以及數(shù)字濾波器的核心原理;在體系建構(gòu)上注重與當(dāng)今技術(shù)發(fā)展的適配性,增加了對卡爾曼濾波、擴(kuò)展卡爾曼濾波,以及人工神經(jīng)網(wǎng)絡(luò)、深度學(xué)習(xí)等技術(shù)領(lǐng)域的基本概念和核心原理的介紹。此外,本書給出了 Matlab 實(shí)踐內(nèi)容和程序示例,可作為與課程配套的實(shí)踐教學(xué)課程內(nèi)容。本書可作為通信工程、電子信息工程、電子信息科學(xué)與技術(shù)等電子信息類專業(yè)的本科生教材。提供了多學(xué)時(shí)配置方案,可滿足不同專業(yè)的不同需求,也可供研究生和有關(guān)科技工作者參考。
丁志中,合肥工業(yè)大學(xué)教授,碩士生導(dǎo)師。合肥工業(yè)大學(xué)計(jì)算機(jī)與信息學(xué)院通信工程系系主任、通信與信息系統(tǒng)研究所所長、IEEE會員及IEEE通信學(xué)會會員。安徽省人防、民防信息化建設(shè)技術(shù)專家。發(fā)表論文40余篇,出版教材2部。
目 錄
第 1 章 信號與系統(tǒng)導(dǎo)論 ···················································································.1 1.1 信號的概念 ···························································································.1 1.1.1 信號的定義和描述 ·················································································.1 1.1.2 信號的分類 ·························································································.2 1.1.3 信號的運(yùn)算和獨(dú)立變量變換 ·······································································.6 1.2 基本信號 ·····························································································.10 1.2.1 正弦信號 ···························································································.10 1.2.2 指數(shù)信號 ···························································································.12 1.2.3 單位階躍信號 ·····················································································.14 1.2.4 單位沖激信號 ·····················································································.16 1.2.5 抽樣函數(shù) ···························································································.23 1.3 系統(tǒng) ···································································································.24 1.3.1 系統(tǒng)的基本概念 ···················································································.24 1.3.2 系統(tǒng)特性及 LTI 系統(tǒng) ··············································································.27 1.3.3 SISO 系統(tǒng)的時(shí)域描述 ·············································································.33 1.4 信號與系統(tǒng)的基本問題和基本內(nèi)容 ····························································.34 *1.5 Matlab 實(shí)踐入門 ··················································································.35 1.5.1 Matlab 中信號的表示 ··············································································.35 1.5.2 輸出圖形的修飾 ···················································································.41 1.5.3 應(yīng)用舉例 ···························································································.43 習(xí)題 ··········································································································.45 第 2 章 信號與系統(tǒng)的時(shí)域分析 ·········································································.50 2.1 離散時(shí)間 LTI 系統(tǒng)的零狀態(tài)響應(yīng):卷積和 ···················································.50 2.1.1 LTI 系統(tǒng)響應(yīng)求解的基本思想 ····································································.50 2.1.2 零狀態(tài)響應(yīng)的卷積和求解 ·········································································.50 2.1.3 卷積和的計(jì)算 ·····················································································.52 2.1.4 卷積和的性質(zhì) ·····················································································.57 2.2 連續(xù)時(shí)間 LTI 系統(tǒng)的零狀態(tài)響應(yīng):卷積積分 ················································.60 2.2.1 零狀態(tài)響應(yīng)的卷積積分求解 ······································································.60 2.2.2 卷積積分的計(jì)算 ···················································································.61 2.2.3 卷積積分的性質(zhì) ···················································································.64 2.3 系統(tǒng)沖激響應(yīng)的性質(zhì) ··············································································.66 2.3.1 系統(tǒng)特性與沖激響應(yīng) ··············································································.66 2.3.2 理想系統(tǒng)的沖激響應(yīng) ··············································································.67 信號與系統(tǒng) X 2.3.3 互聯(lián)系統(tǒng)的沖激響應(yīng) ··············································································.67 *2.4 系統(tǒng)的方框圖表示 ···············································································.69 2.4.1 微分方程描述系統(tǒng)的方框圖表示 ·································································.69 2.4.2 差分方程描述系統(tǒng)的方框圖表示 ·································································.72 *2.5 相關(guān)分析 ···························································································.74 2.5.1 連續(xù)時(shí)間信號相關(guān)函數(shù) ···········································································.74 2.5.2 離散時(shí)間信號相關(guān)函數(shù) ···········································································.81 *2.6 正交分析 ···························································································.82 2.6.1 信號正交的概念和定義 ···········································································.82 2.6.2 信號的正交分解與近似 ···········································································.85 *2.7 Matlab 實(shí)踐 ························································································.88 2.7.1 卷積和的計(jì)算 ·····················································································.88 2.7.2 系統(tǒng)響應(yīng)求解 ·····················································································.89 2.7.3 相關(guān)函數(shù)的計(jì)算 ···················································································.91 習(xí)題 ··········································································································.92 第 3 章 連續(xù)時(shí)間信號與系統(tǒng)的傅里葉分析 ··························································.95 3.1 傅里葉分析的意義 ·················································································.95 3.2 周期信號的傅里葉級數(shù)分析 ·····································································.96 3.2.1 周期信號的傅里葉級數(shù)展開 ······································································.96 3.2.2 復(fù)指數(shù)展開式系數(shù)的基本性質(zhì) ·································································.101 3.2.3 周期信號的頻譜 ·················································································.103 *3.2.4 關(guān)于傅里葉級數(shù)的幾點(diǎn)補(bǔ)充 ···································································.105 3.3 非周期信號的傅里葉變換分析 ································································.106 3.3.1 非周期信號的傅里葉變換表示 ·································································.106 3.3.2 傅里葉變換的性質(zhì)—X(?)的特點(diǎn) ·····························································.111 3.3.3 傅里葉變換的性質(zhì)—信號運(yùn)算的傅里葉變換 ················································.112 3.3.4 周期信號的傅里葉變換 ·········································································.125 3.3.5 傅里葉變換與信號頻譜 ·········································································.129 *3.3.6 能量譜密度和功率譜密度 ·····································································.133 3.4 連續(xù)時(shí)間 LTI 系統(tǒng)的頻域分析 ································································.137 3.4.1 連續(xù)時(shí)間 LTI 系統(tǒng)的頻域表示··································································.137 3.4.2 理想傳輸系統(tǒng)和濾波器 ·········································································.139 *3.4.3 因果穩(wěn)定系統(tǒng)的頻率響應(yīng)特性 ································································.141 3.5 信號的抽樣 ························································································.142 3.5.1 時(shí)域抽樣分析和時(shí)域抽樣定理 ·································································.142 *3.5.2 模擬信號的數(shù)字處理系統(tǒng) ·····································································.149 *3.5.3 頻域抽樣分析和頻域抽樣定理 ································································.152 *3.6 希爾伯特變換 ···················································································.153 3.6.1 希爾伯特變換及其有關(guān)概念 ····································································.153 *3.6.2 解析信號 ·······················································································.157 目 錄 XI 3.7 Matlab 實(shí)踐 ························································································.159 3.7.1 周期信號的分解與合成—傅里葉級數(shù) ·······················································.159 3.7.2 非周期信號的頻譜—傅里葉變換 ····························································.161 3.7.3 信號時(shí)域抽樣 ···················································································.162 3.7.4 希爾伯特變換在 AM 信號解調(diào)中的應(yīng)用—包絡(luò)檢波 ·······································.165 附錄 ········································································································.166 習(xí)題 ········································································································.168 第 4 章 離散時(shí)間信號與系統(tǒng)的傅里葉分析 ························································.174 4.1 周期序列的傅里葉級數(shù)分析 ···································································.174 4.1.1 離散傅里葉級數(shù)(DFS) ·······································································.174 4.1.2 DFS 的性質(zhì)—周期序列頻譜 ck的特點(diǎn) ······················································.176 4.1.3 復(fù)指數(shù)諧波序列及其性質(zhì) ·······································································.178 4.1.4 周期序列的頻譜及其特征 ·······································································.180 4.2 非周期序列的傅里葉變換分析 ································································.181 4.2.1 離散時(shí)間傅里葉變換(DTFT) ································································.181 4.2.2 DTFT 的性質(zhì)—頻譜函數(shù) j X (e ) ? 的特點(diǎn) ····················································.184 4.2.3 DTFT 的性質(zhì)—變換的性質(zhì) ··································································.187 4.2.4 非周期序列的頻譜及其特征 ····································································.192 *4.2.5 周期序列的傅里葉變換 ········································································.194 *4.2.6 序列內(nèi)插零和序列抽取的頻譜分析 ···························································.196 4.3 離散傅里葉變換(DFT) ······································································.201 4.3.1 序列頻譜的離散化和 DFT 的定義 ······························································.201 4.3.2 DFT 和 DFS 的關(guān)系 ·············································································.203 *4.3.3 周期卷積與圓周卷積 ··········································································.208 4.3.4 DFT 的性質(zhì)—X[k]的特性 ····································································.213 *4.3.5 DFT 的性質(zhì)—變換的性質(zhì) ··································································.215 *4.3.6 DFT 的譜線間隔分析— j X (e ) ? 的頻域抽樣 ···············································.224 *4.3.7 快速傅里葉變換(FFT) ······································································.225 4.4 離散時(shí)間系統(tǒng)與連續(xù)時(shí)間系統(tǒng) ································································.228 4.4.1 離散時(shí)間系統(tǒng)頻率響應(yīng) ·········································································.229 4.4.2 連續(xù)時(shí)間頻率和離散時(shí)間頻率 ·································································.232 4.4.3 連續(xù)時(shí)間和離散時(shí)間信號頻譜之間的關(guān)系 ····················································.234 4.4.4 連續(xù)時(shí)間和離散時(shí)間頻率響應(yīng)函數(shù)之間的關(guān)系 ···············································.235 *4.5 數(shù)字濾波—FIR 濾波器 ·····································································.236 4.5.1 數(shù)字濾波的核心原理—脈沖響應(yīng)不變法 ····················································.236 4.5.2 FIR 濾波器 ·······················································································.238 *4.6 Matlab 實(shí)踐 ······················································································.243 4.6.1 fft 函數(shù)調(diào)用和譜線分析 ·········································································.243 4.6.2 數(shù)字濾波函數(shù)調(diào)用和信號的數(shù)字濾波 ··························································.246 習(xí)題 ········································································································.250 信號與系統(tǒng) XII 第 5 章 連續(xù)時(shí)間信號與系統(tǒng)的 s 域分析 ···························································.254 5.1 拉普拉斯變換 ·····················································································.254 5.1.1 拉普拉斯變換的定義及收斂域 ·································································.254 5.1.2 拉普拉斯變換的性質(zhì) ············································································.263 5.1.3 拉普拉斯逆變換求解 ············································································.274 *5.1.4 單邊周期信號的拉普拉斯變換 ································································.281 5.2 系統(tǒng)響應(yīng)的 s 域求解 ············································································.282 5.2.1 微分方程描述系統(tǒng)的響應(yīng)求解 ·································································.283 *5.2.2 電路的 s 域分析 ················································································.285 *5.2.3 自由響應(yīng)與強(qiáng)迫響應(yīng)、穩(wěn)態(tài)響應(yīng)與暫態(tài)響應(yīng) ·················································.288 5.3 系統(tǒng)的 s 域分析 ··················································································.290 5.3.1 系統(tǒng)函數(shù)與系統(tǒng)特性 ············································································.290 5.3.2 系統(tǒng)函數(shù)與系統(tǒng)頻率響應(yīng)特性 ·································································.293 *5.3.3 全通系統(tǒng)和最小相位系統(tǒng) ·····································································.298 *5.3.4 物理可實(shí)現(xiàn)系統(tǒng) ················································································.301 *5.4 模擬濾波器設(shè)計(jì) ················································································.303 5.4.1 巴特沃斯低通濾波器 ············································································.303 *5.4.2 切比雪夫低通濾波器 ··········································································.308 5.4.3 低通到高通、帶通和帶阻濾波器的變換 ·······················································.310 *5.5 Matlab 實(shí)踐 ······················································································.313 5.5.1 拉普拉斯變換求解 ··············································································.313 5.5.2 部分分式展開及逆變換求解 ····································································.314 5.5.3 系統(tǒng)零極點(diǎn)和系統(tǒng)頻率響應(yīng) ····································································.315 5.5.4 模擬濾波器設(shè)計(jì) ·················································································.317 附錄 ········································································································.320 習(xí)題 ········································································································.322 第 6 章 離散時(shí)間信號與系統(tǒng)的 z 域分析 ···························································.327 6.1 z 變換 ·······························································································.327 6.1.1 z 變換的定義及收斂域 ··········································································.327 6.1.2 z 變換的性質(zhì) ····················································································.333 6.1.3 逆 z 變換的求解 ·················································································.340 *6.1.4 單邊周期序列的 z 變換 ········································································.346 6.2 系統(tǒng)響應(yīng)的 z 域求解 ············································································.349 6.2.1 差分方程描述系統(tǒng)的響應(yīng)求解 ·································································.349 6.2.2 方框圖描述系統(tǒng)的響應(yīng)求解 ····································································.351 *6.2.3 完全響應(yīng)的分解及響應(yīng)分量的 z 域求解 ······················································.351 6.3 系統(tǒng)的 z 域分析 ··················································································.354 6.3.1 系統(tǒng)函數(shù)與系統(tǒng)特性 ············································································.354 6.3.2 系統(tǒng)函數(shù)與系統(tǒng)頻率響應(yīng)特性 ·································································.357 *6.3.3 全通系統(tǒng)和最小相位系統(tǒng) ·····································································.359 目 錄 XIII *6.3.4 因果穩(wěn)定性和可實(shí)現(xiàn)性 ········································································.361 *6.4 z 變換與拉普拉斯變換 ········································································.362 6.4.1 從拉普拉斯變換到 z 變換 ·······································································.362 6.4.2 s 平面和 z 平面之間的映射關(guān)系 ································································.363 *6.5 數(shù)字濾波—IIR 濾波器 ······································································.364 6.5.1 雙線性變換法 ···················································································.364 6.5.2 IIR 濾波器的設(shè)計(jì)與實(shí)現(xiàn) ········································································.367 *6.6 Matlab 實(shí)踐 ······················································································.369 6.6.1 離散時(shí)間系統(tǒng)頻率響應(yīng) ·········································································.369 6.6.2 IIR 數(shù)字濾波器設(shè)計(jì)與實(shí)現(xiàn) ·····································································.370 附錄 ········································································································.372 習(xí)題 ········································································································.373 第 7 章 狀態(tài)方程與 MIMO 系統(tǒng) ······································································.375 7.1 系統(tǒng)的狀態(tài)方程描述 ············································································.375 7.1.1 離散時(shí)間狀態(tài)方程 ··············································································.375 7.1.2 連續(xù)時(shí)間狀態(tài)方程 ··············································································.377 *7.1.3 狀態(tài)方程描述的特點(diǎn)及相關(guān)問題的討論 ······················································.378 7.2 卡爾曼濾波 ························································································.379 7.2.1 卡爾曼濾波的基本原理和迭代公式 ····························································.379 7.2.2 卡爾曼增益和卡爾曼濾波的核心概念 ··························································.387 7.2.3 協(xié)方差矩陣和誤差傳播 ·········································································.389 7.2.4 一維卡爾曼濾波的收斂性分析 ·································································.390 7.2.5 卡爾曼濾波的初始賦值 ·········································································.393 *7.2.6 卡爾曼濾波和頻域?yàn)V波 ········································································.395 *7.3 貝葉斯濾波 ······················································································.395 7.3.1 狀態(tài)值的貝葉斯估計(jì) ············································································.396 7.3.2 貝葉斯濾波算法 ·················································································.397 7.3.3 概率濾波和高斯濾波 ············································································.401 7.3.4 貝葉斯濾波框架下的線性卡爾曼濾波 ··························································.402 *7.4 非線性卡爾曼濾波 ·············································································.403 7.4.1 擴(kuò)展卡爾曼濾波(EKF) ·······································································.403 7.4.2 無跡卡爾曼濾波(UKF) ······································································.406 7.5 MIMO 系統(tǒng) ························································································.412 7.5.1 MIMO 系統(tǒng)的描述 ··············································································.412 7.5.2 MIMO LTI 系統(tǒng)的變換域求解 ··································································.417 *7.6 MIMO 與神經(jīng)網(wǎng)絡(luò) ·············································································.420 7.6.1 人腦神經(jīng)系統(tǒng)的 MIMO 建模 ···································································.420 7.6.2 神經(jīng)網(wǎng)絡(luò)的基本原理 ············································································.422 7.6.3 多層神經(jīng)網(wǎng)絡(luò)的反向傳播算法 ·································································.426 7.6.4 神經(jīng)網(wǎng)絡(luò)與分類 ·················································································.429 信號與系統(tǒng) XIV 7.6.5 深度學(xué)習(xí) ·························································································.432 7.6.6 卷積神經(jīng)網(wǎng)絡(luò) CNN ·············································································.434 *7.7 Matlab 實(shí)踐 ······················································································.435 7.7.1 卡爾曼濾波應(yīng)用一:勻速平面行駛車輛的位置跟蹤 ··········································.436 7.7.2 卡爾曼濾波應(yīng)用二:系統(tǒng)控制設(shè)計(jì) ····························································.438 附錄 ········································································································.439 附錄 A 矢量和矩陣的基本概念及公式 ·······························································.439 附錄 B 隨機(jī)變量和高斯分布的基本概念及公式 ·····················································.444 習(xí)題 ········································································································.451 參考文獻(xiàn) ·····································································································.453
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