Cyclic-Prefix CDMA System with Chip Based Equalization and Interference Cancellation

Author

Li, Yushan ; Mclaughlin, Steve ; Cruickshank, David G M

Author_Institution

Sch. of Eng. & Electron., Edinburgh Univ.

Volume

1

fYear

2005

fDate

11-14 Sept. 2005

Firstpage

402

Lastpage

406

Abstract

In this paper, a chip-level MMSE frequency domain equalizer (FDE) is investigated for a cyclic-prefix CDMA (CP-CDMA) system. The multiple access interference (MAI) and inter chip interference (ICI) is reduced at the chip level before despreading. One code multiplexed pilot channel carries a higher power than dedicated channels and is utilized for channel estimation. It also brings high MAI to the other users. In this paper, the impact of imperfect channel estimation is studied and a pilot interference cancellation algorithm is proposed. We deploy a high power pilot channel to obtain good channel estimates, subsequently, the high MAI along with the pilot channel is removed by the proposed algorithm. Performance of the proposed algorithm is shown by computer simulations

Keywords

channel estimation; code division multiple access; equalisers; frequency-domain analysis; interference suppression; least mean squares methods; mobile radio; radiofrequency interference; MAI; MMSE; channel estimation; chip based equalization; cyclic-prefix CDMA system; frequency domain equalizer; inter chip interference; interference cancellation; multiple access interference; Channel estimation; Decision feedback equalizers; Downlink; Fading; Frequency domain analysis; Interference cancellation; Mobile communication; Multiaccess communication; Multiple access interference; OFDM; FDE; MAI; chip-level; interference cancellation;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 2005. PIMRC 2005. IEEE 16th International Symposium on

Conference_Location

Berlin

Print_ISBN

9.7838007291e+012

Type

conf

DOI

10.1109/PIMRC.2005.1651467

Filename

1651467