Digital Communications 1 - Fundamentals and Techniques

It is a complete training in digital communications in the same book with all the aspects involved in such training: courses, tutorials with many typical problems targeted with detailed solutions, practical work concretely illustrating various aspects of technical implementation implemented. It breaks down into three parts. The Theory of information itself, which concerns both the sources of information and the channels of its transmission, taking into account the errors they introduce in the transmission of information and the means of protect by the use of appropriate coding methods. Then for the technical aspects of transmission, first the baseband transmission is presented with the important concept and fundamental technique of equalization. The performance evaluation in terms of probability of errors is systematically developed and detailed as well as the online codes used. Finally, the third part presents the Transmissions with digital modulation of carriers used in radio transmissions but also on electric cables. A second important aspect in learning a learner's knowledge and skills is this book. It concerns the "Directed Work" aspect of a training. This is an ordered set of 33 typical problems with detailed solutions covering the different parts of the course with practical work. Finally, the last aspect concerns the practical aspects in the proper sense of the term, an essential complement to training going as far as know-how. We propose here a set of 5 practical works.

Sommario

Foreword xi
 
Part 1. Theory of Information 1
 
Introduction to Part 1 3
 
Chapter 1. Introduction to Telecommunications 5
 
1.1. Role of a communication system 5
 
1.1.1. Types of services offered by communication systems 6
 
1.1.2. Examples of telecommunications services 7
 
1.2. Principle of communication 7
 
1.3. Trend towards digital communications 10
 
Chapter 2. Measurement of Information of a Discrete Source and Channel Capacity 13
 
2.1. Introduction and definitions 13
 
2.2. Examples of discrete sources 14
 
2.2.1. Simple source (memoryless) 14
 
2.2.2. Discrete source with memory 14
 
2.2.3. Ergodic source: stationary source with finite memory 15
 
2.2.4. First order Markovian source (first order Markov chain) 15
 
2.3. Uncertainty, amount of information and entropy (Shannon's 1948 theorem) 16
 
2.3.1. Entropy of a source 18
 
2.3.2. Fundamental lemma 18
 
2.3.3. Properties of entropy 19
 
2.3.4. Examples of entropy 19
 
2.4. Information rate and redundancy of a source 20
 
2.5. Discrete channels and entropies 20
 
2.5.1. Conditional entropies 22
 
2.5.2. Relations between the various entropies 24
 
2.6. Mutual information 25
 
2.7. Capacity, redundancy and efficiency of a discrete channel 27
 
2.7.1. Shannon's theorem: capacity of a communication system 27
 
2.8. Entropies with k random variables 29
 
Chapter 3. Source Coding for Non-disturbance Channels 31
 
3.1. Introduction 31
 
3.2. Interest of binary codes 31
 
3.3. Single decoding codes 32
 
3.3.1. Regular code 33
 
3.3.2. Single-decoded code (decipherable or decodable code) 33
 
3.3.3. Instantaneous code (irreducible code) 34
 
3.3.4. Prefix 34
 
3.3.5. Design of an instantaneous binary code 35
 
3.3.6. Kraft McMillan inequality 36
 
3.4. Average codeword length 36
 
3.4.1. Coding efficiency in terms of transmission speed 36
 
3.4.2. Minimum average codeword length lmin 37
 
3.5. Capacity, efficiency and redundancy of a code 38
 
3.6. Absolute optimal codes 38
 
3.7. K-order extension of a source 39
 
3.7.1. Entropy of the 2nd order extension of a source [S] 39
 
3.7.2. Simple example of the interest of coding a source extension 40
 
3.8. Shannon's first theorem 41
 
3.9. Design of optimal binary codes 42
 
3.9.1. Shannon-Fano coding 42
 
3.9.2. Huffman code 43
 
Chapter 4. Channel Coding for Disturbed Transmission Channels 47
 
4.1. Introduction 47
 
4.2. Shannon's second theorem (1948) 48
 
4.3. Error correction strategies 48
 
4.4. Classification of error detection codes or error correction codes 49
 
4.5. Definitions related to code performance 50
 
4.5.1. Efficiency 50
 
4.5.2. Weight of linear code or Hamming's weight 50
 
4.5.3. Hamming distance 51
 
4.6. Form of the decision 51
 
4.6.1. Maximum a posteriori likelihood decoding 52
 
4.7. Linear group codes 53
 
4.7.1. Decoding ball concept: Hamming's theorem 54
 
4.7.2. Generating matrix [G] and test matrix [H] 55
 
4.7.3. Error detection and correction 58
 
4.7.4. Applications: Hamming codes (r = 1) 59
 
4.7.5. Coding and decoding circuits 62
 
4.7.6. Extension of Hamming codes 63
 
4.7.7. Relationships between columns of the matrix [H'] 64
 
4.8. Cyclic codes 65
 
4.8.1. Introduction 65
 
4.8.2. Expression of a circular pe

Info autore

El Assad Safwan, Associate Professor HDR at the University of Nantes Barba Dominique, Former Professor of the University of Nantes / Polytech Nantes

Riassunto

It is a complete training in digital communications in the same book with all the aspects involved in such training: courses, tutorials with many typical problems targeted with detailed solutions, practical work concretely illustrating various aspects of technical implementation implemented. It breaks down into three parts. The Theory of information itself, which concerns both the sources of information and the channels of its transmission, taking into account the errors they introduce in the transmission of information and the means of protect by the use of appropriate coding methods. Then for the technical aspects of transmission, first the baseband transmission is presented with the important concept and fundamental technique of equalization. The performance evaluation in terms of probability of errors is systematically developed and detailed as well as the online codes used. Finally, the third part presents the Transmissions with digital modulation of carriers used in radio transmissions but also on electric cables. A second important aspect in learning a learner's knowledge and skills is this book. It concerns the "Directed Work" aspect of a training. This is an ordered set of 33 typical problems with detailed solutions covering the different parts of the course with practical work. Finally, the last aspect concerns the practical aspects in the proper sense of the term, an essential complement to training going as far as know-how. We propose here a set of 5 practical works.

Dettagli sul prodotto

• Autori: Dominique Barba, Safwa El Assad, Safwan El Assad
• Editore: Wiley & Sons
• Lingue: Inglese
• Formato: Copertina rigida
• Pubblicazione: 31.12.2020
• EAN: 9781786305411
• ISBN: 978-1-78630-541-1
• Pagine: 336
• Dimensioni: 162 mm x 241 mm x 22 mm
• Peso: 602 g
• Categorie: Guide e manuali; Scienze naturali, medicina, informatica, tecnica > Tecnica > Elettronica, elettrotecnica, telecomunicazioni; Informatik, Computertechnik, informationstechnologie, computer science, Systemtechnik, Computer Engineering, Information Technologies, Electrical & Electronics Engineering, Elektrotechnik u. Elektronik, Systemtechnik u. -management, Systems Engineering & Management