Frequency overlay of GSM and cellular B-CDMA

Author

Koorevaar, Perry ; Ruprecht, Jurg

Author_Institution

KPN Telecom B.V., Den Haag, Netherlands

Volume

48

Issue

3

fYear

1999

fDate

5/1/1999 12:00:00 AM

Firstpage

696

Lastpage

707

Abstract

The maximum capacity gain of a cellular broad-band direct-sequence code-division multiple-access (DS-CDMA) overlay on top of a cellular global system for mobile communications (GSM) system is estimated. Using geometrical arguments and a standard propagation model, all relevant contributions to the carrier-to-interference ratios (CIRs) of the GSM and CDMA systems are numerically evaluated. It is assumed that the base stations (BSs) of both systems are unilocated and that the power control in both systems is perfect. Furthermore, in the CDMA transmitters and receivers, ideal notch filtering is assumed around the occupied GSM frequencies of the same cell. Adapting standard limits for the CIRs of 5-7 dB for CDMA and 9-12 dB for GSM, the total system capacity can be increased considerably over the GSM-only case: the capacity is increased by a factor of 1.8-2.9 if no macrodiversity is employed and by a factor of 1.9-3.3 if macrodiversity in the CDMA downlink is applied

Keywords

broadband networks; cellular radio; channel capacity; code division multiple access; diversity reception; interference suppression; multiuser channels; notch filters; power control; radio links; radio receivers; radio transmitters; radiofrequency interference; radiowave propagation; telecommunication control; DS-CDMA; GSM frequencies; base stations; carrier-to-interference ratios; cellular B-CDMA; cellular broad-band overlay; direct-sequence code-division multiple-access; downlink; frequency overlay; global system for mobile communications; ideal notch filtering; macrodiversity; maximum capacity gain; perfect power control; receivers; standard propagation model; total system capacity; transmitters; Base stations; Downlink; Filtering; Frequency; GSM; Multiaccess communication; Power control; Power system modeling; Solid modeling; Transmitters;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/25.764959

Filename

764959