1.5 GHz band portable telephone for personal digital cellular system
K. Kobayashi, K. Chiba, Tadao Takami · 2002
The 1.5 GHz pocket-size portable telephone has been developed by NTT DoCoMo for our personal digital cellular system. The telephone's major design parameters, the configuration of the radio unit, software configuration, and interfaces to fax/modem adaptors are described. Besides being compact, the portable telephone features high speech quality, long stand-by time, high quality data communication and a user-friendly man-machine interface.>