Block spreading for discrete multi-tone CDMA systems in the presence of frequency-selective fading

Author

Leus, Geert ; Moonen, Marc

Author_Institution

ESAT, Katholieke Univ., Leuven, Belgium

Volume

2

fYear

1999

fDate

24-27 Oct. 1999

Firstpage

1601

Abstract

We discuss a quasi-synchronous discrete multi-tone CDMA (DMT-CDMA) system based on block spreading, with a block size equal to the DMT symbol size, in the presence of frequency-selective fading. For such a system, we develop a simple receiver that completely removes the multi-user interference (MUI) and (single-user) inter-tone interference (ITI), when a special set of code sequences is used. As a result the BER does not saturate as the noise decreases, in contrast to a related existing receiver for a standard DMT-CDMA system in the presence of frequency-selective fading.

Keywords

OFDM modulation; code division multiple access; codes; correlators; error statistics; fading channels; interference suppression; multiuser channels; radio receivers; radiofrequency interference; spread spectrum communication; BER; DMT symbol size; DMT-CDMA system; block size; block spreading; channel estimation; code sequences; discrete multi-tone CDMA systems; frequency-selective fading; inter-tone interference; multiuser interference; noise; quasi-synchronous discrete multi-tone CDMA; receiver; single-user interference; Bit error rate; Code division multiplexing; Code standards; Electrical equipment industry; Fading; Frequency; Interference; Laboratories; Multiaccess communication; OFDM modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems, and Computers, 1999. Conference Record of the Thirty-Third Asilomar Conference on

Conference_Location

Pacific Grove, CA, USA

ISSN

1058-6393

Print_ISBN

0-7803-5700-0

Type

conf

DOI

10.1109/ACSSC.1999.832018

Filename

832018