Network Coding and Wireless Physical-layer ... - Jacobs University

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Chapter 2 Introduction to Digital Communication Systems and Networks Although the objective of our investigation is communication networks in general, we would like, at first, to introduce the elements of point-to-point digital communication in Section 2.1, as well as the mathematical models of communication channels in 2.2. After that, routing in communication networks is introduced in 2.3. 2.1 Basic Elements of A Secure Digital Communication System In this section, we discuss those basic elements constituting a digital communication system. When talking about any communication system in general, three basic elements must certainly be there. They are transmitter, channel, and receiver. However, when discussing a digital communication system in particular, we need to be specific about what constitutes the transmitter and the receiver. According to Proakis [30], a basic digital communication system can be shown in a block diagram in Fig. 2.1. 5
6 Chapter 2: Introduction to Digital Communication Systems and Networks Binary Source Source Encoder Channel Encoder Digital Modulator Channel Binary Sink Source Decoder Channel Decoder Digital Demodulator Figure 2.1: A basic digital communication system To make the system secure, however, we need to insert two more blocks, which are encryptor and decryptor, as shown in Fig. 2.2. Binary Source Source Encoder Encryptor Channel Encoder Digital Modulator Channel Binary Sink Source Decoder Decryptor Channel Decoder Digital Demodulator Figure 2.2: A secure digital communication system A digital transmitter consists of four basic elements, which are a binary source, a source encoder, a channel encoder, and a digital modulator, whereas a digital receiver is composed of a digital demodulator, a channel decoder, a source decoder, and a binary sink. A binary source in the transmitter generates information to be transmitted, be it audio, speech, or video data, in a binary representation. Usually, this representation is not the most economical one possible, i.e., it is possible to squeeze it into a shorter string of 0s and 1s without reducing the amount of information, or reducing only some insignificant amount of it. The source encoder is made for this task. It transforms the data into another binary representation with less redundancy. These two blocks, however, are not the focus of this thesis. Our concern in the thesis ranges from the third block, the encryptor, to the ninth block, the decryptor. Although the encryptor in Fig. 2.2 locates right after the source encoder, it is not necessarily the case when we consider some new cryptographic technologies, for example, physical-layer security and physical-layer secret-key generation, which will be discussed in detail in Part III.
Page 1: Network Coding and Wireless Physica
Page 4 and 5: Abstract The general abstraction of
Page 6 and 7: Contents Abstract i Abstract ii Dec
Page 8 and 9: vi CONTENTS 5.4 Degree Distribution
Page 10 and 11: List of Figures 2.1 A basic digital
Page 12 and 13: x LIST OF FIGURES 5.11 Comparison o
Page 14 and 15: Part I Motivation, Overview, and In
Page 16 and 17: Chapter 1: Motivation and Overview
Page 20 and 21: Chapter 2: Introduction to Digital
Page 30 and 31: Chapter 3: Introduction to Graphs a
Page 46 and 47: 33 The emergence of scalable video
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Chapter 4: Unequal Erasure Protecti
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Chapter 4: Unequal Erasure Protecti
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Chapter 5: Network Coding with LT C
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Part III Wireless Physical-layer Se
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Chapter 6 Wireless Physical-layer S
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Chapter 6: Wireless Physical-layer
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Chapter 7 Physical-layer Key Encodi
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Chapter 7: Physical-layer Key Encod
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Chapter 8: Summary, Conclusion, and
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Bibliography [1] 3GPP, “3GPP; Tec
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BIBLIOGRAPHY 121 [21] F.A. Hayek,
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BIBLIOGRAPHY 123 [43] M. Friedman a
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BIBLIOGRAPHY 125 [63] S. Jaggi, P.
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BIBLIOGRAPHY 127 [81] X. Sun, X. Wu
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