Block spectral precoding for blind multiuser detection of DS/CDMA signals

Author

Al-Bayati, A.K.S. ; Prakriya, Shankar ; Prasad, Surendra

Author_Institution

Dept. of Electr. Eng., Indian Inst. of Technol., New Delhi, India

fYear

2002

fDate

15-17 Dec. 2002

Firstpage

238

Lastpage

242

Abstract

A new approach for blind multiuser (MU) detection of DS/CDMA signals is proposed. This approach is based on modifying the data spectrum, uniquely for each user, through a two stage coloring-whitening precoding scheme. This enables separation and detection of a desired user´s signal in an unknown multipath channel, regardless of the power of the interferers. This technique does not involve any sacrifice in data rate or system bandwidth. The method can be considered as an extension of the approach of J. Xavier et al. (see IEEE Trans. on Sig. Processing, vol.49, p.1073-86, 2001) to the multipath DS/CDMA channel. Detection does not involve channel estimation, and does not use code knowledge. Besides, the proposed method can tolerate severe carrier frequency offsets, with reasonable performance.

Keywords

code division multiple access; encoding; multipath channels; multiuser detection; spread spectrum communication; DS-CDMA signals; DS/CDMA signals; blind multiuser detection; block spectral precoding; channel estimation; coloring-whitening precoding scheme; data spectrum; multipath channel; Bandwidth; Blind source separation; Channel estimation; Filters; Frequency synchronization; Interference suppression; Multiaccess communication; Multiuser detection; Signal detection; Source separation;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal Wireless Communications, 2002 IEEE International Conference on

Print_ISBN

0-7803-7569-6

Type

conf

DOI

10.1109/ICPWC.2002.1177285

Filename

1177285