Frequency-Domain Interchip Interference Cancelation for DS-CDMA Downlink Transmission

Author

Takeda, Kazuaki ; Adachi, Fumiyuki

Author_Institution

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

Volume

56

Issue

3

fYear

2007

fDate

5/1/2007 12:00:00 AM

Firstpage

1286

Lastpage

1294

Abstract

The use of frequency-domain equalization (FDE) based on minimum-mean-square-error criterion can significantly improve the bit-error-rate (BER) performance of orthogonal multicode direct-sequence code-division multiple access downlink signal transmission in a frequency-selective fading channel. However, the presence of residual interchip interference (ICI) after FDE produces the orthogonality distortion among the spreading codes, and the BER performance degrades as the number of multiplex order increases. In this paper, we propose a frequency-domain ICI cancellation scheme, in which the residual ICI replica in the frequency domain is generated and subtracted from each frequency component of the received signal after FDE. Three types of ICI cancelation scheme are presented, and the effectiveness of the proposed ICI cancelation scheme is confirmed by computer simulation

Keywords

code division multiple access; equalisers; error statistics; fading channels; frequency-domain analysis; interference suppression; least mean squares methods; spread spectrum communication; telecommunication links; BER; DS-CDMA; bit error rate; downlink transmission; frequency selective fading channel; frequency-domain equalization; frequency-domain interchip interference; interference cancellation; minimum mean square error criterion; orthogonal multicode direct sequence code division multiple access; spreading codes; Bit error rate; Computer simulation; Degradation; Direct-sequence code-division multiple access; Downlink; Frequency domain analysis; Frequency-selective fading channels; Interference cancellation; Multiaccess communication; Signal generators; Direct-sequence code-division multiple access (DS-CDMA); frequency-domain equalization (FDE); interchip-interference (ICI) cancelation;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/TVT.2007.895474

Filename

4201069