A performance analysis of an overlay of CDMA and FDMA satellite communications systems

Author

Stitt, R.M. ; McCarthy, J.R. ; Rice, Matthew

Author_Institution

Defence Commun. Res. Centre, Univ. South Australia, The Levels, SA, Australia

fYear

1994

fDate

27 Sep-1 Oct 1994

Firstpage

412

Lastpage

417

Abstract

The concept of overlay in radio communication systems has been around for some time with particular emphasis on terrestrial links and spectral sharing between spread spectrum and existing narrowband services. We present an analysis regarding a direct sequence code division multiple access (CDMA) and narrowband frequency division multiple access (FDMA) overlay in a satellite environment and discuss models which describe the behaviour of the mutual interference to both systems. Although a CDMA system has an inherent resistance to jamming, an FDMA system with a large number of active users constitutes a severe interference problem for successful operation. Fortunately, a CDMA design affords some flexibility in parameters such as centre frequency, spread rate and power level which can be chosen by the designer in response to different FDMA implementations. We present results for various FDMA frequency allocations within the overlay and discuss the impact of coding and conforming to existing International Telecommunications Union (ITU) regulations

Keywords

code division multiple access; encoding; frequency allocation; frequency division multiple access; performance evaluation; pseudonoise codes; radiofrequency interference; satellite communication; spread spectrum communication; CDMA; FDMA; ITU regulations; International Telecommunications Union; centre frequency; coding; direct sequence code division multiple access; frequency allocations; frequency division multiple access; jamming resistance; mutual interference; narrowband services; performance analysis; power level; radio communication systems overlay; satellite communications systems; spectral sharing; spread rate; spread spectrum services; terrestrial links; Direct-sequence code-division multiple access; Frequency conversion; Frequency division multiaccess; Interference; Multiaccess communication; Narrowband; Performance analysis; Radio communication; Satellite broadcasting; Spread spectrum communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Universal Personal Communications, 1994. Record., 1994 Third Annual International Conference on

Conference_Location

San Diego, CA

Print_ISBN

0-7803-1823-4

Type

conf

DOI

10.1109/ICUPC.1994.383125

Filename

383125