書????名 | "通信系統(tǒng)工程(第二版)(英文版) (美)普??耍╬roakis,j.g.)sn8518" | 作????者 | "(美)普埃克(Proakis,J.G.)等著" |
---|---|---|---|
出版社 | 電子工業(yè)出版社 | 定????價 | 72 元 |
ISBN | 9787121040474 |
目前光纖通信系統(tǒng)中常用的光源主要有兩種:發(fā)光二極管(LED)和激光器(LD)。激光器由于在調(diào)制速率和耦合效率方面都明顯優(yōu)于發(fā)光二極管所以一般適用于大、中容量的長距離通信系統(tǒng),同時由于電流—光輸出特性線...
FAS系統(tǒng)(即調(diào)度通信系統(tǒng))的FAS是什么的簡稱
FAS系統(tǒng),是基于GSM-R技術(shù)的新一代數(shù)字通信調(diào)度系統(tǒng),具有適應(yīng)鐵路運輸特點,符合鐵路通信信號一體化技術(shù)發(fā)展趨勢,技術(shù)水平高,應(yīng)用范圍廣的綜合競爭優(yōu)勢,在京津、武廣和鄭西客運三條高速鐵路已得到成功應(yīng)...
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視訊通信系統(tǒng)工程 試運行方案 第 1 頁 XXXX視訊通信系統(tǒng)工程(以下簡稱系統(tǒng))已全面完成,并于 2012年 1月 9 日通過部門初步驗收。按照合同,系統(tǒng)將進(jìn)入全面試運行階段,以檢驗系統(tǒng)長 期運行的穩(wěn)定性、可靠性和實際應(yīng)用的效果。并在試運行中,建立健全運行操 作和系統(tǒng)維護(hù)規(guī)范以及應(yīng)急預(yù)案,為系統(tǒng)投入實際運行和完善提供實際運行數(shù) 據(jù)和依據(jù)。 試運行主要包括:系統(tǒng)功能試運行;硬件設(shè)備的試運行;以及光纖、裝修 的試運行。 一、試運行目的 試運行目的通過既定時間段的試運行,全面考察項目建設(shè)成果,并通過試 運行發(fā)現(xiàn)項目存在的問題,從而進(jìn)一步完善項目建設(shè)內(nèi)容,確保項目順利通過 竣工驗收并平穩(wěn)地移交給運行管理部門。 通過實際運行中系統(tǒng)功能與性能的全面考核,來檢驗系統(tǒng)在長期運行中的 整體穩(wěn)定性和可靠性。 1.系統(tǒng)功能、性能與穩(wěn)定性考核 (1)系統(tǒng)功能及性能的實際應(yīng)用考核; (2)系統(tǒng)主要硬件設(shè)備、輔助設(shè)
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x 通信系統(tǒng)工程施工現(xiàn)場配合與控制 現(xiàn)代通信包括多媒體通信、 計算機(jī)通信網(wǎng)絡(luò)、 個人通信、 數(shù)字圖像通信 (可視電話) 、 移動衛(wèi)星通信、 程控交換機(jī)、語音信箱與電子信箱等。在我國,電話網(wǎng)是通信的最基本的載 體,它的自動化將體現(xiàn)在硬件結(jié)構(gòu)上和軟件設(shè)計上,如可編程、可交換、可自動計費,并組 成全球性的網(wǎng)絡(luò)系統(tǒng)等。電話通信線路從進(jìn)戶管線直到用戶出線盒等組成,分別敘述如下: (1)通信電線引入(進(jìn)戶):通過電纜管溝或直埋從地下進(jìn)戶;通過電纜管溝或 直埋,由外墻進(jìn)戶;通過架空電纜由外墻進(jìn)戶。 (2)程控交換機(jī)房或配線設(shè)備間: 1)通信電纜引進(jìn)屋內(nèi)設(shè)置用戶程控機(jī)時, 采用總配線箱或總配線架, 此房間稱電 話機(jī)房。 2)通信電纜引進(jìn)屋內(nèi)不設(shè)置用戶程控機(jī)時, 電話局進(jìn)戶電纜置于交接箱內(nèi), 此房 間稱電話交接間。 3)電話機(jī)房或交接間宜設(shè)置在一層或二層,如有地下室,且較干燥,通風(fēng)良好, 可考慮將電話機(jī)房或
《通信系統(tǒng)工程(第2版改編版)》內(nèi)容:The objective of this book is to provide an introduction to the basic princi ples in the analysis and design of communication systems. It is primarily intended for use as a text for a first course in communications, either at a senior level or at a firstyear graduate level.BROAD TOPICAL COVERAGE Although we have placed a very strong emphasis on digital communications, we have provided a solid introduction to analog communications. The major topics covered are: An introduction to analog signal transmission and reception (Chapters 2and3)An introduction to digital communications (Chapters 48)EMPHASIS ON DIGITAL COMMUNICATIONS Our motivation for emphasizing digital communications is due to the techno logical developments that have occurred during the past five decades. To day, digital communication systems are in common use and generally carry the bulk of our daily information transmission through a variety of communi cations media, such as wireline telephone channels, microwave radio, fiber optic channels, and satellite channels.
PREFACE
1 INTRODUCTION
1. 1 Historical Review 1
1.2 Elements of an Electrical Communication System
1.2.1 Digital Communication System 9
1.2.2 Early Work in Digital Communications 13
1.3 Communication Channels and Their Characteristics
1.4 Mathematical Models for Communication Channels
1.5 Organization of the Book 28
1.6 Further Reading 30
2 ANALOG SIGNAL TRANSMISSION AND RECEPTION
2.1 Introduction to Modulation 32
2.2 Amplitude Modulation (AM) 33
2.2.1 Double-Sideband Suppressed Carrier AM 33
2. 2. 2 Conventional Amplitude Modulation 40
2.2.3 Single-Sideband AM 44
* 2.2.4 Vestigial-Sideband AM 48
2.2.5 Implementation of AM Modulators and Demodulators 52
2.2.6 Signal Multiplexing 58
2.3 Angle Modulation 61
2.3. 1 Representation of FM and PM Signals 62
2.3.2 Spectral Characteristics of Angle-Modulated Signals 66
2.3. 3 Implementation of Angle Modulators and Demodulators 73
2.4 Radio and Television Broadcasting 81
2.4.1 AM Radio Broadcasting 82
2.4. 2 FM Radio Broadcasting 84
2.4.3 Television Broadcasting 87
2.5 Mobile Radio Systems 97
2.6 Further Reading 100
Problems 100
3 EFFECT OF NOISE ON ANALOG COMMUNICATION SYSTEMS 115
3.1 Effect of Noise on Linear-Modulation Systems 115
3.1.1 Effect of Noise on a Baseband System 116
3. 1.2 Effect of Noise on DSB-SC AM 116
3. 1.3 Effect of Noise on SSB AM 118
3.1.4 Effect of Noise on Conventional AM 119
*3.2 Carrier-Phase Estimation with a Phase-Locked Loop (PLL) 124
3.2. 1 The Phase-Locked Loop ( PLL ) 125
3.2.2 Effect of Additive Noise on Phase Estimation 128
3.3 Effect of Noise on Angle Modulation 135
3.3. 1 Threshold Effect in Angle Modulation 145
3.3.2 Pre-emphasis and De-emphasis Filtering 149
3.4 Comparison of Analog-Modulation Systems 153
3.5 Further Reading 154
Problems 155
4 INFORMATION SOURCES AND SOURCE CODING 161
4.1 Modeling of Information Sources 162
4. 1.1 Measure of Information 164
4.1.2 Joint and Conditional Entropy 167
4.2 Source-Coding Theorem 169
4.3 Source-Coding Algorithms 172
4.4 Rate-Distortion Theory 177
4. 4. 1 Mutual Information 178
4. 4. 2 Differential Entropy 179
4.4.3 Rate-Distortion Function 181
4.5 Quantization 187
4.5. 1 Scalar Quantization 188
* 4.5.2 Vector Quantization 198
4.6 Waveform Coding 201
4.6. 1 Pulse-Code Modulation ( PCM) 201
4. 6. 2 Differential Pulse-Code Modulation ( DPCM) 207
4.6. 3 Delta Modulation (AM) 210
4.7 Digital Audio Transmission and Digital Audio Recording 213
4. 7. 1 Digital Audio in Telephone Transmission Systems 214
* 4. 7. 2 Digital Audio Recording 216
4.8 Further Reading 221
Problems 222
5 DIGITAL TRANSMISSION THROUGH THE ADDITIVE WHITE GAUSSIAN NOISE CHANNEL
6 DIGITAL TRANSMISSION THROUGH BANDLIMITED AWGN CHANNELS
7 CHANNEL CAPACITY AND CODING
8 WIRELESS COMMUNICATIONS
REFERENCES
INDES2100433B
2021年,通信系統(tǒng)工程安裝與維護(hù)列入《職業(yè)教育專業(yè)目錄(2021年)》。