Introduction To Communication Systems

Introduction To Communication Systems

This textbook presents an introduction to communication systems with an emphasis on signal design and modulation. The book carefully develops the mathematical principles upon which such systems are based, using examples from a wide variety of current communications systems wherever possible. These range from commercial broadcasting and telephone systems to satellite telemetry and radar.From the Inside FlapThis textbook presents to undergraduates an introductory explanation of communication systems, with the emphasis on signal design and modulation. The approach is therefore tailored to a careful development of the mathematical principles upon which such systems are based, using examples from a wide variety of current communication systems wherever possible. These range from commercial broadcasting and telephone systems to satellite telemetry and radar. Extended Topical Coverage Material added in this third edition is, primarily, about digital methods and reflects the continually increasing importance of digital signal transmission and modulation in communication systems. New material on the use of fiber optics in communications and the integrated services digital network (ISDN) has been added in Chapter 7, as well as an expended treatment of Nyquist waveform shaping for control of ISI. Optimum filtering methods for use with ISI criteria have been included in Chapter 9. Chapter 10 has an expanded treatment of FSK and both parallel and serial MSK, as well as two new sections on spread spectrum systems. Therefore, the presentation in this last chapter includes digital modulation methods that are currently being investigated for new communication systems designs. Approach and Pedagogical Features Because this textbook is intended for undergraduates, the material is written in as explicit a manner as possible and is clearly and liberally illustrated. Frequent use of example problems (117) and drill problems (133) with answers that, wherever possible, exemplify current practical problems helps to draw the student into an active participation in the learning process. With the example problems worked out in the text, followed by drill problems with answers, this textbook lends itself to self-paced or individualized tutorial instruction. Each chapter ends with a summary section followed by a wide selection of problems so that the instructor can adjust the level considerably by assigning problems appropriate to the level of a specific course. Each of the problems is identified by section number for content; thus students may refer to the appropriate text sections if they encounter difficulties. A major change in this edition is an expanded set of problems for homework assignments at the end of each chapter. The focus of these problems is on analysis, verification, synthesis, extensions, illustrations of practice, and systems design considerations. Because not every problem can incorporate all aspects, there is a wide variety of problems (520 total) in this edition; 60% are new, and nearly 90% are either new or substantially revised from previous editions. It is my hope that these problems will stimulate interest as well as prove very beneficial in understanding the material presented. There are 50 computer problems distributed throughout the book, with the heaviest concentration in Chapter 3 to make use of the DFT and the FFT algorithms. Although programs can be written for many of these problems, they are designed to be run using the engineering software so readily available for personal computers. ** A unique feature of this third edition is the inclusion of one or two special systems design problems at the end of each chapter. These problems have been taken from practical systems design situations and are intended to not only illustrate the relevance of the material covered but also to give students some concept of what types of problems might arise in engineering work in the area of communicatio