Principles of Communicationprovides an introduction to the fundamental principles of communications. It systematically presents basic mathematical background for system and signals, analog communication systems, and modern digital communication systems and describes the Principles of Communications theory in an easy-to-understand way. The text covers advanced topics in modern digital communications, especially related to wireless communications, including forward error correcting codes, fading channels, OFDM, and CDMA. This book can serve as the basis of communication system design and as a way to quickly understand the principles of communication systems for those who do not major in communications. Its readership includes undergraduate and graduate level students in communications and research engineers at communication companies.Preface History and Milestones of Communication Technology Filtering of Random Processes and Signals Analog Communications Pulse Modulations and Digital Coding Optimal Receiver of Digital Communication Systems Passband Digital Transmission Error Correcting Codes Communications over Wireless in Fading Channels Orthogonal Frequency Division Multiplexing Spread Spectrum Communications and Code Division Multiple Access References Index