Unified spatio-temporal frequency domain equalization for multi- and single-carrier CDMA systems

Author

Brühl, Lars ; Rembold, Bernhard

Author_Institution

Inst. of High Frequency Technol., Rheinisch-Westfalische Tech. Hochschule, Aachen, Germany

Volume

2

fYear

2002

fDate

2002

Firstpage

676

Abstract

Single carrier (SC-) and multi carrier (MC-) CDMA transmission are compared. Spreading and pulse shaping processes are shown to be identical in both systems. Based on this equality, a unified frequency domain system model is derived for a multiuser system with multiple base station antennas. The system model includes the effects of spreading, oversampling, pulse shaping, the MIMO (multiple input multiple output) channel and selection filter. Linear spatio-temporal joint detection is proposed for the uplink and an appropriate predistortion for the downlink. Predistortion offers efficient downlink transmission with spatial diversity and uses a signal processing very similar to the joint detection. Similarities of uplink and downlink processing of SC and MC-CDMA argues for a unified hardware implementation. This idea is discussed and some implementation issues like variable FFT sizes, conflicts in resource sharing, different resolution requirements and computational complexity are addressed.

Keywords

MIMO systems; broadband networks; code division multiple access; computational complexity; diversity reception; equalisers; fast Fourier transforms; frequency-domain analysis; multipath channels; multiuser detection; pulse shaping; radio access networks; time-varying channels; FFT; MIMO channel; OFDM; broadband wireless access; computational complexity; multi-carrier CDMA systems; multipath environments; multiple base station antennas; multiuser system; oversampling; predistortion; pulse shaping; resource sharing; selection filter; signal processing; single carrier CDMA systems; spatial diversity; spatio-temporal frequency domain equalization; spatio-temporal joint detection; spreading; time-varying environments; unified frequency domain system; Base stations; Downlink; Filters; Frequency domain analysis; MIMO; Multiaccess communication; Multicarrier code division multiple access; Predistortion; Pulse shaping methods; Signal processing;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th

ISSN

1090-3038

Print_ISBN

0-7803-7467-3

Type

conf

DOI

10.1109/VETECF.2002.1040684

Filename

1040684