The capacity of broadband CDMA overlaying a GSM cellular system

Author

Grieco, Donald M. ; Schilling, Donald L.

Author_Institution

InterDigital Commun. Corp., Great Neck, NY, USA

fYear

1994

fDate

8-10 Jun 1994

Firstpage

31

Abstract

The author proposes that one can overlay an existing GSM cellular network with a broadband CDMA cellular system utilizing direct-sequence spread spectrum alone with agile notch filters at the base station. Notch filter depths of 35 dB on receive and 20 dB in transmit were found to be adequate. Capacity calculations show that the B-CDMA overlay can approximately quadruple the nominal capacity of GSM, which is 16 channels per sector, by providing an additional 51 voice channels at 16 kbps each. Also, the author has calculated that the B-CDMA mobile transmits on average with 16 dB less power than the GSM mobile, while the CDMA base transmit power per channel would be about 5.5 dB less than the GSM base due to the lower CIR required by the B-CDMA overlay system

Keywords

broadband networks; cellular radio; code division multiple access; digital radio; notch filters; pseudonoise codes; spread spectrum communication; B-CDMA overlay; GSM cellular system; base station; broadband CDMA; capacity; direct-sequence spread spectrum; notch filters; voice channels; Bandwidth; Base stations; Filters; GSM; Interference; Multiaccess communication; Neck; Radio frequency; Spread spectrum communication; Telephony;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1994 IEEE 44th

Conference_Location

Stockholm

ISSN

1090-3038

Print_ISBN

0-7803-1927-3

Type

conf

DOI

10.1109/VETEC.1994.345170

Filename

345170