Title :
Design concept of TDMA cellular mobile radio units
Author :
Shimizu, Isao ; Chiba, Kohji ; Takami, Tadao ; Tanda, Takesi ; Murota, Kazuaki
Author_Institution :
NTT Radio Commun. Syst. Lab., Kanagawa, Japan
Abstract :
A digital mobile communication system that allows more cellular subscribers as well as achieving upgraded service has been developed. The design concept and performance of car-mounted, portable, and handheld cellular telephones for the digital mobile communication system is presented. Major system parameters standardized by RCR, which are mandatory in the Japanese digital cellular system, and the mobile radio unit configuration based on the specification are introduced. Novel technologies for achieving highly precise and efficient π/4-shifted QPSK transmission in digital mobile radio units are shown, and excellent performance is demonstrated. Furthermore, based on these technologies, a design method to achieve low power consumption and small-sized handheld telephone is shown
Keywords :
cellular radio; cordless telephone systems; phase shift keying; radio equipment; telephone sets; time division multiple access; π/4-shifted QPSK transmission; Japanese digital cellular system; Japanese standard; RCR; TDMA cellular mobile radio units; car mounted telephones; handheld cellular telephones; portable telephones; power consumption; radio unit configuration; specification; system parameters; Commercialization; Demodulation; Digital modulation; Land mobile radio; Mobile communication; Quadrature phase shift keying; Radio frequency; Radiofrequency amplifiers; Telephony; Time division multiple access;
Conference_Titel :
Vehicular Technology Conference, 1992, IEEE 42nd
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-0673-2
DOI :
10.1109/VETEC.1992.245330
