The book is designed to prepare the reader to analyze and potentially design digital cellular mobile communication systems. Important fundamentals are explained clearly and mathematically refined. The book is aimed at students of electrical engineering and related fields, but it can also serve as a foundation for training seminars in the industry. The pace and diversity of global efforts to advance existing systems and to conceptualize future digital cellular mobile communication systems make it necessary to categorize and evaluate conceptual proposals and detailed results in order to gain an overview of the overall situation, especially regarding future perspectives.