OFDM and DS-CDMA approaches, analysis of performances on fading multipath channels

Author

Hicheri, Nizar ; Terré, Michel ; Fino, Bernard

Author_Institution

Conservatoire Nat. des Arts et Metiers, Paris, France

Volume

4

fYear

2002

fDate

15-18 Sept. 2002

Firstpage

1498

Abstract

We show how orthogonality constraints for DS-CDMA spreading sequences yield directly to OFDM sequences. Having shown this duality we do a comparison of performances between these two waveforms in a multipath fading channel context. The comparison includes the MC-CDMA approach. We show how the cyclic prefix solution can be used for DS-CDMA in order to propose an MMSE optimal despreading solution. This first part of our study is based on a perfect channel estimation. The second part includes channel estimation uncertainty in the comparison. Parameters of simulations, presented in this paper, correspond typically to an UMTS downlink transmission.

Keywords

3G mobile communication; OFDM modulation; channel estimation; code division multiple access; fading channels; least mean squares methods; multipath channels; multiuser channels; radio links; sequences; spread spectrum communication; DS-CDMA spreading sequences; MMSE optimal despreading; OFDM sequences; UMTS downlink transmission; channel estimation uncertainty; cyclic prefix solution; fading multipath channels; orthogonality constraints; perfect channel estimation; simulations; spreading sequences; 3G mobile communication; Channel estimation; Downlink; Fading; Multiaccess communication; Multicarrier code division multiple access; Multipath channels; OFDM; Performance analysis; Uncertainty;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 2002. The 13th IEEE International Symposium on

Print_ISBN

0-7803-7589-0

Type

conf

DOI

10.1109/PIMRC.2002.1045428

Filename

1045428