Combined OFDM-CDMA configuration for multimedia wireless applications

Author

Cacopardi, Saverio ; Frescura, Fabrizio ; Reali, Gianluca

Author_Institution

Istituto di Elettronica, Perugia Univ., Italy

Volume

42

Issue

4

fYear

1996

fDate

11/1/1996 12:00:00 AM

Firstpage

865

Lastpage

873

Abstract

This paper analyses the applicability of OFDM modulation when combined with CDMA for multimedia wireless systems operating in an indoor environment. We demonstrate the motivations and benefits deriving from this combination. Particular emphasis is given to channel equalisation techniques, designed to face different problems arising in the up-link and in the down-link. In particular, an equalisation technique based on channel inversion, combined with carrier interleaving and adaptive suppression of noisy carriers, is proposed in the down-link, while a pre-equalisation approach is used in the up-link. The analysis provides both BER performance and computational cost of the most important procedures that are to be implemented within multimedia terminals. The computational cost analysis is carried out using commercial DSP platforms

Keywords

code division multiple access; equalisers; error statistics; frequency division multiplexing; indoor radio; interference suppression; land mobile radio; modulation; multimedia communication; pseudonoise codes; radio links; radiofrequency interference; spread spectrum communication; telecommunication channels; telecommunication terminals; BER performance; DS-CDMA; OFDM modulation; OFDM-CDMA configuration; adaptive suppression; carrier interleaving; channel equalisation; channel inversion; commercial DSP platforms; computational cost analysis; down-link; indoor environment; mobile terminal; multimedia terminals; multimedia wireless applications; multimedia wireless systems; noisy carriers; preequalisation; uplink; Adaptive equalizers; Bit error rate; Computational efficiency; Indoor environments; Interleaved codes; Multiaccess communication; Multimedia systems; OFDM modulation; Performance analysis; Working environment noise;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.555761

Filename

555761