Time-Domain Spreading And Frequency-Domain Spreading for Delay-time/Code Division Multi-Access

Author

Takeda, Kazuki ; Yamamoto, Tetsuya ; Adachi, Fumiyuki

Author_Institution

Dept. of Electr. & Commun. Eng., Tohoku Univ., Sendai

fYear

2008

fDate

11-14 May 2008

Firstpage

1529

Lastpage

1533

Abstract

The uplink (mobile-to-base) bit error rate (BER) performance is significantly degraded due to the multi-access interference (MAI). Recently, we have proposed a new hybrid multi-access technique, called delay-time/code division multiaccess (DT/CDMA). A different user is assigned a different cyclic time delay and/or spreading code. DT/CDMA can obtain the frequency diversity gain while suppressing the MAI. In the previous paper, time-domain spreading was considered. In this paper, we consider frequency-domain spreading and compare the achievable BER performances of DT/CDMA using time-domain spreading and frequency-domain spreading.

Keywords

code division multiple access; error statistics; frequency-domain analysis; mobile radio; radiofrequency interference; time-domain analysis; DT-CDMA hybrid multiaccess technique; bit error rate; code division multiaccess; delay-time multiaccess; frequency-domain spreading; multiaccess interference; time-domain spreading; uplink BER performance; Base stations; Bit error rate; Degradation; Delay effects; Frequency diversity; Frequency division multiaccess; Frequency-selective fading channels; Multiaccess communication; Multiple access interference; Time domain analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2008. VTC Spring 2008. IEEE

Conference_Location

Singapore

ISSN

1550-2252

Print_ISBN

978-1-4244-1644-8

Electronic_ISBN

1550-2252

Type

conf

DOI

10.1109/VETECS.2008.357

Filename

4525913