Analysis of the performance degradation in uplink MC-CDMA systems with Doppler induced frequency offsets

Author

Cosovic, Ivan ; Schenell, M. ; Dukic, Miroslav ; Springer, Andreas

Author_Institution

Inst. of Commun. & Navigation, German Aerosp. Res. Establ., Wessling, Germany

Volume

2

fYear

2004

fDate

20-24 June 2004

Firstpage

962

Abstract

In this paper, uplink time division duplex (TDD) multi-carrier code-division multiple-access (MC-CDMA) systems applying pre-equalization to combat channel impairments are considered. Especially, the performance degradation caused by the Doppler induced frequency offsets among the different mobile users is analyzed in detail. Based on this analysis different frequency interleaving schemes are proposed and their potential to reduce the performance degradation is investigated. It turns out, that a frequency interleaver which is allowed to skip a few, well-defined subcarriers is capable of reducing the influence of Doppler induced frequency offsets significantly causing a very little loss in bandwidth efficiency.

Keywords

code division multiple access; equalisers; mobile radio; radio links; telecommunication channels; time division multiplexing; Doppler induced frequency offsets; MC-CDMA systems; frequency interleaving schemes; multicarrier code-division multiple-access systems; uplink time division duplex; Channel estimation; Degradation; Downlink; Frequency conversion; Frequency synchronization; Interleaved codes; Multiaccess communication; Multicarrier code division multiple access; Performance analysis; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2004 IEEE International Conference on

Print_ISBN

0-7803-8533-0

Type

conf

DOI

10.1109/ICC.2004.1312644

Filename

1312644