OFDM code-division multiplexing in fading channels

Author

Kaiser, Stefan

Author_Institution

Inst. of Commun. & Navigation, German Aerosp. Center (DLR), Wessling, Germany

Volume

50

Issue

8

fYear

2002

fDate

8/1/2002 12:00:00 AM

Firstpage

1266

Lastpage

1273

Abstract

In this paper, orthogonal frequency-division multiplexing-code-division multiplexing (OFDM-CDM) is presented and investigated as alternative to conventional OFDM for high rate data transmission. An additional multipath diversity gain can be obtained with OFDM-CDM by spreading each data symbol in frequency and time. The optimum reliability information for the Viterbi (1979) decoder is derived for OFDM-CDM systems, and the tradeoff between spreading and channel coding in OFDM systems is presented. By using efficient interference cancellation or joint detection techniques, it can be shown that OFDM-CDM outperforms conventional OFDM with respect to bit error rate (BER) performance and bandwidth efficiency.

Keywords

OFDM modulation; Viterbi decoding; diversity reception; error statistics; fading channels; interference suppression; multipath channels; radiofrequency interference; signal detection; BER performance; OFDM code-division multiplexing; Viterbi decoder; bandwidth efficiency; bit error rate; channel coding; data symbol spreading; fading channels; high rate data transmission; interference cancellation; joint detection; multipath diversity gain; optimum reliability information; orthogonal frequency-division multiplexing; soft interference cancellation; wireless systems; Bit error rate; Code division multiplexing; Data communication; Decoding; Diversity methods; Fading; Frequency diversity; Frequency division multiplexing; OFDM; Viterbi algorithm;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2002.801460

Filename

1025498