ELEMENTS OF DIGITAL COMMUNICATION

ELEMENTS OF DIGITAL COMMUNICATION
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ELEMENTS OF DIGITAL COMMUNICATION

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Publisher: KHANNA PUBLISHERS
ISBN: 9788174091602
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PREFACE Several years ago the author used to teach this subject which included Analog and Digital modulation techniques. Since then several new digital communication techniques evolved and signal processing techniques also underwent enormous volume of changes and developments. This book is written for undergraduate students at an elementary level. Most modern techniques have been briefly touched upon. Further, some methods overlap with the Computer Communication techniques , these are missing here for obvious reasons. A companion book covering digital signal processing was written by the author a few years ago. Students reading the latter demanded a similar kind of book on digital communication. This in short is the story behind writing this book. Students will find it rewarding if these two books are read alongside the other. Because the hardware used in electrical communication makes heavy use of digital signal processing techniques, Digital Processing concepts advanced in these two books are mutually stimulating. The field of electrical communication engineering received large scale attention during and after the second world war 1940-48 . Significant developments during this era includes pulse-code-modulation PCM techniques, radar, and microwave systems, Transistor, VLSI integrated circuits, PC s Personal Computers , Communication Satellites, Laser, and Fiber Optics. Today, electrical communication systems, span the entire globe carrying Text Fax , voice, pictures, and a variety of other information. Digital computers being a versatile machine found itself a secured place in this communication environment. Digital communication between the points use numerical data, hence is noise-free, and this was found highly attractive to electrical communication channel users. Organization of the book In the first chapter the essence of digital communication is briefly discussed in order that the reader obtains a special view of the subject matter. This includes similarities and differences that exist between analog and digital communication techniques in the form of block diagrams. Certain basic concepts emphasizing the figure of merit for comparison of different systems have been pointed out. Principles of Networking and mobile-radio have been briefly discussed with a view to amplify the applications of digital communications. Signal theory and linear systems form the contents of chapter 2. As is well known that Fourier series, Fourier Integral, and also Fourier transform form the backbone of any electrical communication technique. Therefore, adequate coverage has been given towards the mathematics of Fourier techniques and its applications to linear system analysis. Relationship between time domain and frequency domain is discussed at length. Spectral analysis of modulation and demodulation techniques, and Fast Fourier transforms FFT are also included. Transmitting of analog information using digital methods PCM form the contents of the third chapter. Principles of sampling, quantizing, and coding and time-division-multiplexing TDM of anlog data are presented in this chapter. Performances of several practical communication system are compared with the performance of an ideal system. Pulse-code modulation PCM , Delta modulation, Adaptive delta modulation, etc. have been treated. Chapter 4 deals with random signal theory, which includes, probability theory, statistical averages, auto-correlation, cross-correlations, power spectral density etc. Calculations of probability of appearance of one letter symbol followed by another was also treated as an example towards formation of words, which carry information. Chapter 5 discusses essentially Shannon s theory of communication, which is named as Information theory and coding. Concepts of entropy as a measure of information, coding etc. are also highlighted. Source
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encoding theorem, channel coding theorem are among the six important theorems for which Shannon discussed. Shannon s limits are also pointed out. Error control coding, block codes, BCH codes etc. forms the contents of 5th chapter. Emphasis has been laid on convolutional