π/4-shift QPSK coherent detection demodulator for TDMA/TDD systems

Author

Matsumoto, Y. ; Kubota, S. ; Morikura, M. ; Kato, S.

Author_Institution

NTT Radio Commun. Syst. Lab., Kanagawa, Japan

fYear

1993

fDate

18-20 May 1993

Firstpage

396

Lastpage

399

Abstract

A π/4-shifted quadrature phase shift keying (QPSK) coherent detection demodulator for microcellular time division multiple access/time division duplexing (TDMA/TDD) systems is proposed. The demodulator employs a reverse-modulation type carrier recovery circuit with a -π/4 signal phase rotator for coherent detection, and an initial clock recovery circuit for fast synchronization of transmitted bursts. Computer simulation results show that coherent detection with the proposed carrier recovery circuit reduces the irreducible frame error rate by 50% compared with differential detection and achieves a 4-dB improvement at a frame error rate of 10^-2 with transmission diversity in the fading channel typical of personal communication

Keywords

cellular radio; demodulators; diversity reception; fading; land mobile radio; personal communication networks; quadrature phase shift keying; synchronisation; time division multiple access; π/4 QPSK; TDMA/TDD systems; clock recovery circuit; coherent detection demodulator; fading channel; irreducible frame error rate; microcellular radio; personal communication; quadrature phase shift keying; reverse-modulation type carrier recovery circuit; synchronization; time division duplexing; time division multiple access; transmission diversity; Circuits; Clocks; Computer simulation; Demodulation; Error analysis; Fading; Phase detection; Quadrature phase shift keying; Synchronization; Time division multiple access;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1993., 43rd IEEE

Conference_Location

Secaucus, NJ

ISSN

1090-3038

Print_ISBN

0-7803-1267-8

Type

conf

DOI

10.1109/VETEC.1993.507495

Filename

507495