A design consideration on TDMA cellular radio

Author

Shimazaki, Yoshihito ; Ono, Shigeru ; Nakai, Toshihisa ; Kondoh, Noriaki

Author_Institution

OKI Electr. Ind. Co. Ltd., Tokyo, Japan

fYear

1990

fDate

6-9 May 1990

Firstpage

146

Lastpage

151

Abstract

A time-division multiple access (TDMA) cellular system using QPSK (quadrature phase shift keying) with coherent detection is studied. The required guard time between TDMA bursts and the effect of the unbalanced characteristics of an IF filter on a detected signal are analyzed. An attempt is made to minimize the guard time between TDMA burst signals using a window which suppresses the signal at both edges. As a result, it was found that the required guard time can be reduced to a 2.3 symbol duration in a 3-km radius cell. If a conventional IF filter (which is designed for an analog terminal) is adapted to a digital terminal, in cases of 1 kHz variation of the center frequency intersymbol interference caused by the IF filter would be about -20 dB. It is concluded that more sophisticated IF filters are needed for digital cellular terminals are needed than for analog cellular terminals

Keywords

cellular radio; digital radio systems; radiotelephony; time division multiple access; 3 km; IF filter; QPSK; TDMA burst signals; TDMA cellular radio; analog cellular terminals; center frequency; coherent detection; detected signal; digital cellular terminals; guard time; intersymbol interference; quadrature phase shift keying; time-division multiple access; unbalanced characteristics; Communication industry; Digital communication; Digital filters; Frequency; Gas detectors; Intersymbol interference; Laboratories; Land mobile radio cellular systems; Quadrature phase shift keying; Time division multiple access;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1990 IEEE 40th

Conference_Location

Orlando, FL

ISSN

1090-3038

Type

conf

DOI

10.1109/VETEC.1990.110311

Filename

110311