AFC circuit with fast acquisition for a TDMA cellular mobile communication system

Author

Ohishi, Y. ; Fukuda, E. ; Kubo, T. ; Takano, T. ; Daido, Y.

Author_Institution

Fujitsu Lab. Ltd., Kawasaki, Japan

fYear

1991

fDate

19-22 May 1991

Firstpage

181

Lastpage

185

Abstract

A novel AFC (automatic frequency control) circuit for a TDMA (time-division multiple-access) digital cellular mobile communication system with π/4-shifted QPSK (quadrature phase-shift keying) modulation is described. The AFC circuit satisfies the two contradictory requirements of fast acquisition and stable operation even under low CNR (carrier-to-noise ratio) channel conditions, simultaneously. The performance of a 40-kb/s TDMA transmission system was measured to confirm the availability of the AFC circuit. An E_b/ N₀ penalty of the differential demodulator is compressed to less than 0.1 dB by the AFC circuit when carrier frequency deviation is within ±1 kHz. The results obtained show that the differential detection can be applied to a receiver of the TDMA digital cellular mobile communication system when the proposed AFC circuit is implemented

Keywords

automatic frequency control; cellular radio; digital radio systems; phase shift keying; time division multiple access; π/4-shifted QPSK; 40 kbit/s; AFC circuit; TDMA; automatic frequency control; carrier-to-noise ratio; differential detection; digital cellular mobile communication system; fast acquisition; quadrature phase-shift keying; Automatic frequency control; Circuits; Communication system control; Control systems; Digital modulation; Mobile communication; Phase modulation; Phase shift keying; Quadrature phase shift keying; Time division multiple access;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1991. Gateway to the Future Technology in Motion., 41st IEEE

Conference_Location

St. Louis, MO

ISSN

1090-3038

Print_ISBN

0-87942-582-2

Type

conf

DOI

10.1109/VETEC.1991.140473

Filename

140473