In recent years, wireless communication is being increasingly used in various real-life applications catering useful services to the society. These applications include cellular mobile networks, ad hoc networks, cognitive radio networks, ubiquitous and pervasive computing, sensor networks, and so on. This book presents the fundamental concepts and the current state-of-the-art in this field, so that the reader can use it as a reference book both for classroom study/teaching as well as for technology development and research in the relevant areas.