The objective of this book is to provide an introduction to the basic principles in the analysis and design of communication systems. It is primarily intended for use as a text for a first course in communications, either at senior undergraduate or post-graduate level. This new edition of the book contains relevant topics from digital communication system principles including, source coding, channel coding, baseband and carrier modulation, channel distortion, channel equalization, synchronization, and wireless communications. Table of Contents Preface 1. Introduction. 2. Frequency Domain Analysis of Signals and Systems. 3. Analog Signal Transmission and Reception. 4. Random Processes. 5. Effect of Noise on Analog Communication Systems. 6. Information Sources and Source Coding. 7. Digital Transmission Through the Additive White Gaussian Noise Channel. 8. Digital Transmission Through Bandlimited AWGN Channels. 9. Channel Capacity and Coding. 10. Wireless Communications. Appendix A. The Probability of Error for Multichannel Reception of Binary Signals.Exercises References. Index.