Design concept of TDMA cellular mobile radio units

摘要

A digital mobile communication system that allows more cellularnsubscribers as well as achieving upgraded service has been developed.nThe design concept and performance of car-mounted, portable, andnhandheld cellular telephones for the digital mobile communication systemnis presented. Major system parameters standardized by RCR, which arenmandatory in the Japanese digital cellular system, and the mobile radionunit configuration based on the specification are introduced. Novelntechnologies for achieving highly precise and efficient π/4-shiftednQPSK transmission in digital mobile radio units are shown, and excellentnperformance is demonstrated. Furthermore, based on these technologies, andesign method to achieve low power consumption and small-sized handheldntelephone is shown