The main methods and technical solutions for building a digital radio channel for mobile radio systems, as well as general principles for the construction and design of mobile radio networks . The first part of the book is devoted to the theoretical foundations of building a radio channel . It discusses the properties of digital modulating signals, classical narrowband modulation methods and modulated signals with an extended spectrum, types of feding with multipath propagation of radio waves , methods of optimal reception of digital modulated signals in conditions of white Gaussian noise and feding , clock synchronization schemes and digital message recovery algorithms, Methods of frequency synthesis and conversion. The second part systematizes information about the organization of communication channels and networks. Methods of separation and switching of channels are considered, Data transmission via digital radio channel , Access of subscribers to limited network resources and resolution of conflict situations , Tranking and quality of service , Management of customer service during migration , basics of building cellular networks , Radio range calculation and frequency-territorial planning. In the second edition, the shortcomings and inaccuracies were corrected, sections devoted to the peculiarities of the propagation of radio waves in the city, optimal reception and synchronization were significantly expanded. ;Grif:Recommended by the UMO for education in the field of telecommunications as a teaching aid for students of higher educational institutions studying in the direction of training bachelors and masters in "Telecommunications" and in the direction of training of certified specialists in "Telecommunications"