Dual Mode Mobile Unit for Next Generation Digital Narrow Channel Cellular Telephone System (NOT KNOWN IF PUBLISHED BECAUSE AUTHOR HAS LEFT AT&T)

This paper describes the topology required of a dual-mode cellular telephone mobile which can operate either in the conventional U.S. 30 KHz analog FM mode or in AT&T's proposed 10 KHz digital channel. This 10 KHz channel is envisioned to be an important step forward in cellular mobile telephony because it triples the number of channels/MHz of bandwidth and provides error controlled voice/data transmission with an ISDN-like interface. A transceiver block diagram is shown and performance specifications are presented. 10 KHz radio transmission parameters, modulation formats and voice coding techniques are discussed.