Open Access

Equivalence of Linear MMSE Detection in DS-CDMA and MC-CDMA Systems over Time and Frequency Selective Channels

EURASIP Journal on Advances in Signal Processing20032002:151725

DOI: 10.1155/S1110865702209099

Received: 21 January 2002

Published: 2 January 2003

Abstract

The goal of this paper is to compare the performance of the linear minimum mean square error (MMSE) detector for a class of code division multiple access (CDMA) systems in time and frequency selective channels. Specifically, we consider direct sequence (DS)-CDMA, multicarrier (MC)-CDMA, and the MC-DS-CDMA systems. Two key tools are used in our development. First, a general time-frequency framework that includes the different CDMA systems as special cases. Second, the duality between time and frequency domains that is used to derive equivalences between the different CDMA systems operating over purely frequency selective and purely time selective channels. We then combine the insights obtained from these special cases to assess the performance of CDMA systems over time and frequency selective channels. We provide sufficient conditions for the codes employed by the CDMA systems for the equivalences to hold. Numerical results are presented to illustrate the results.

Keywords

CDMA multicarrier system time-selective channels frequency selective channels multiuser detection

Authors’ Affiliations

(1)
Department of Electrical and Computer Engineering, University of Wisconsin-Madison

Copyright

© Kadous and Sayeed 2002