Channel adapted CDMA for MAI/ISI-free power optimized burst transmission with space diversity at the base station

Author

Horlin, François ; Vandendorpe, Luc

Author_Institution

Commun. & Remote Sensing Lab., Univ. Catholique de Louvain, Louvain-la-Neuve, Belgium

Volume

2

fYear

2001

fDate

2001

Firstpage

1251

Abstract

This paper considers the uplink and the downlink of a DS-CDMA multiuser communication system based on burst transmission over frequency selective channels. The purpose is to evaluate the performance gain obtained if space diversity is introduced at the base station with an optimized set of codes. The codes are designed in order to minimize the emitted power at the mobile stations (in case of uplink transmission) or at the base station (in case of downlink transmission) while allowing the complete elimination of the intersymbol interference (ISI) and multiple-access interference (MAI) if filters matched to the total impulse responses are used at the receiver. An iterative algorithm is used to generate the codes. The comparison is made with the performances reached when a conventional set of codes is used. It is shown that the precoding scheme based on channel adapted codes significantly outperforms a system based on a conventional set of codes

Keywords

code division multiple access; codes; diversity reception; interference suppression; intersymbol interference; iterative methods; land mobile radio; multipath channels; multiuser channels; radio links; spread spectrum communication; DS-CDMA multiuser communication; ISI; MAI-ISI-free power optimized burst transmission; base station; channel adapted CDMA; channel adapted codes; downlink transmission; frequency selective channels; impulse response; interference suppression; iterative algorithm; mobile stations; multipath propagation; optimized codes; radio receiver; space diversity; uplink transmission; wireless channels; Base stations; Downlink; Frequency; Interference elimination; Intersymbol interference; Matched filters; Multiaccess communication; Multiple access interference; Performance gain; Space stations;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE

Conference_Location

San Antonio, TX

Print_ISBN

0-7803-7206-9

Type

conf

DOI

10.1109/GLOCOM.2001.965686

Filename

965686