Chip-interleaved Multi-rate CDMA with 2-dimensional OVSF Spreading

Author

Le Liu ; Adachi, Fumiyuki

Author_Institution

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

Volume

4

fYear

2006

fDate

7-10 May 2006

Firstpage

1767

Lastpage

1771

Abstract

Chip interleaving technique has been proposed for DS-CDMA to eliminate the multiple-access interference (MAI). In this paper, we develop this technique to provide the single- or multicarrier CDMA with flexible low-to-high bit rate transmission by jointly using 2-dimensional (2D) OVSF spreading and chip interleaving for quasi-synchronous uplink transmissions in time- and frequency-selective fading channels. Through appropriate design of 2D spreading code assignment, not only the maximum time- and frequency-domain diversity can be achieved but also users are equipped with multi-rate services. The complexity of receivers is greatly reduced since single-user frequency-domain equalization (FDE) based on the MMSE criterion can be applied for signal detection. Computer simulation results show that the multi-rate transmission is possible for the 2D OVSF spread/chip-interleaved CDMA uplink and the bit error rate (BER) performance with turbo coding is very robust against Doppler spread

Keywords

code division multiple access; diversity reception; equalisers; error statistics; fading channels; frequency-domain analysis; interference (signal); interleaved codes; least mean squares methods; signal detection; spread spectrum communication; time-domain analysis; turbo codes; 2-dimensional OVSF spreading; DS-CDMA; Doppler spread; MMSE criterion; bit error rate performance; chip interleaving technique; chip-interleaved multi-rate CDMA; flexible low-to-high bit rate transmission; frequency-domain diversity; frequency-selective fading channels; multi-rate transmission; multicarrier CDMA; multiple-access interference; quasi-synchronous uplink transmissions; signal detection; single-carrier CDMA; single-user frequency-domain equalization; time-domain diversity; time-selective fading channels; turbo coding; Bit error rate; Bit rate; Computer simulation; Frequency-selective fading channels; Interference elimination; Interleaved codes; Multiaccess communication; Multiple access interference; Signal detection; Turbo codes; 2-dimensional OVSF spreading; CDMA; chip interleaving; multi-rate; uplink transmission;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd

Conference_Location

Melbourne, Vic.

ISSN

1550-2252

Print_ISBN

0-7803-9391-0

Electronic_ISBN

1550-2252

Type

conf

DOI

10.1109/VETECS.2006.1683150

Filename

1683150