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.
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.