Abstract
There is much current interest in the development of a speech coding algorithm suitable for use in a digital cellular mobile radio telephone communications system. There are a number of potential advantages in converting the analogue FM cellular system in North America to a digital system: a) The capacity of the cellular system depends on spectrum utilization and the frequency reuse pattern. Conversion to digital transmission will initially increase the spectrum utilization by a factor of three. Digital speech compression allows three virtual channels to be transmitted over a single 30 KHz bandwidth radio channel using a TDMA (time-division multiple access) format. Improved voice coding techniques are expected to increase the capacity by an additional factor of two in the next few years. b) The digital transmission technique will support many new customer services such as data and FAX transmission, encryption and anti-fraud features. Additional services may be based on the ability to determine vehicle locations by triangularization from the base stations.
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