This book introduces the basic techniques used in modern communication systems and provides fundamental tools and methodologies used in the analysis and design of these systems. The authors emphasize digital communication systems - the backbone of modern communication systems - including new generations of wireless communication systems, satellite communications, and data transmission networks.Discusses traditional analog communication systems. Reviews the background material needed in two separate chapters at the end of the book. Provides computer problems in each chapter that require MATLAB to solve. Offers a large number of problems in varying levels of difficulty at the end of each chapter. Features many worked examples throughout. Includes two separate chapters on Information Theory and Coding to give sufficient emphasis to these key topics.A useful reference for practicing engineers.

This book is intended as a senior level undergraduate textbook on communication systems for Electrical Engineering majors. Its primary objective is to introduce the basic techniques used in modern communication systems and to provide fundamental tools and methodologies used in the analysis and design of these systems. Although the book is mainly written as an undergraduate level textbook, it can be equally be useful to the practicing engineer, or as a self study tool.The emphasis of the book is on digital communication systems, which are treated in detail in Chapters 7 through 13. These systems are the backbone of modern communication systems, including new generations of wireless communication systems, satellite communications, and data transmission networks. Traditional analog communication systems are also covered with due detail in Chapters 3, 4, and 6. In addition, the book provides detailed coverage of the background required for the course in two chapters, one on linear system analysis with emphasis on the frequency domain approach and Fourier techniques, and one on probability, random variables, and random processes. Although these topics are now covered in separate courses in the majority of electrical engineering colloquia, it is the experience of the authors that the students frequently need to review these topics in a course on communications, and therefore it is essential to have quick access the relevant material from these courses.It is assumed that the students taking this course have background in calculus, linear algebra, basic electronic circuits, linear system theory, and probability and random variables. These latter two topics are reviewed in two chapters of the book. ORGANIZATION OF THE BOOKThe book starts with a brief review of communication systems in Chapter 1 followed by methods of signal representation and system analysis in both time and frequency domains in Chapter 2. Emphasis is placed on the Fourier series and the Fourier transform representation of signals and the use of transforms in linear systems analysis.Chapters 3 and 4 cover the modulation and demodulation of analog signals. In Chapter 3 amplitude modulation (AM), and in Chapter 4 frequency modulation (FM), and phase modulation (PM) are covered. Radio and television broadcasting and analog mobile radio cellular communication systems are also treated in these chapters.In Chapter 5, we present a review of the basic definitions and concepts in probability and random processes. Special emphasis is placed on Gaussian random processes, which provide mathematically tractable models for additive noise disturbances. Both time domain and frequency domain representations of random signals are presented.Chapter 6 covers the effects of additive noise in the demodulation of amplitude modulated (AM) and angle modulated (FM,PM) analog signals and a comparison of these analog signal modulations in terms of their signal-to-noise ratio performance. Also discussed in this chapter is the problem of estimating the carrier phase using a phase-locked loop (PLL). Finally, we describe the characterization of thermal noise and the effect of transmission losses in analog communication systems.Chapter 7 is devoted to analog-to-digital conversion. Sampling theorem and quantization techniques are treated first, followed by waveform encoding methods including PCM, DPCM, and DM. This chapter concludes with brief discussion of LPC speech coding and the JPEG standard for image compression.Chapter 8 treats modulation methods for baseband AWGN channels. Various types of binary and non-binary modulation methods are described based on a geometric representation of signals and their performance is evaluated in terms of the probability of error. The final topic of this chapter is focused on signal synchronization methods for digital communication systems.In Chapter 9, we consider the problem of digital com