A New Approach to High-Capacity Digital Mobile Radio

We present an outline for the design of a cellular digital mobile radio system suitable for telephone service in urban areas. This system serves two purposes: (i) it demonstrates that a digital system with a capacity comparable to that of existing analog designs12 is a realistic possibility, and (ii) it provides a framework for taking advantage of future advances in digital signal processing, especially speech coding. In this paper, we assume that adequate speech quality can be achieved at 32 kb/s using adaptive-differential-pulse-code modulation 1891 Fig. 1--A hexagonal-cell layout for a mobile radio system. The number in each cell refers to the channel set assigned to it.