Near-far resistant single-user channel identification by interference subspace rejection in wideband CDMA

Author

Affes, Sofiène ; Hansen, Henrik ; Mermelstein, Paul

Author_Institution

INRS-Telecommun., Quebec Univ., Montreal, Que., Canada

fYear

2001

fDate

2001

Firstpage

54

Lastpage

57

Abstract

The single-user CDMA spatio-temporal array receiver (STAR-SU) can be extended to a multiuser version (STAR-MU) by incorporating interference subspace rejection (ISR) using spatio-temporal null-beamforming. We can exploit the data-projection step implemented there to enhance the channel identification for STAR-SU so that it is significantly more robust to near-far power variations than the previous formulation. Our approach effectively decomposes the MU subspace tracking into much simpler single-user 1D subspace tracking operations. Simulations on the downlink reveal that the performance of the new STAR-SU is close to the single-user bound even for near-far ratios as high as 18 dB

Keywords

array signal processing; code division multiple access; identification; interference suppression; multiuser channels; tracking; 1D subspace tracking; STAR-MU; STAR-SU; data-projection step; downlink; interference subspace rejection; multiuser channels; near-far power variations; performance; single-user channel identification; spatio-temporal array receiver; spatio-temporal null-beamforming; wideband CDMA; Array signal processing; Delay; Fingers; Interference; Multiaccess communication; Multidimensional systems; Multiuser detection; Receiving antennas; Robustness; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, 2001. (SPAWC '01). 2001 IEEE Third Workshop on Signal Processing Advances in

Conference_Location

Taiwan

Print_ISBN

0-7803-6720-0

Type

conf

DOI

10.1109/SPAWC.2001.923842

Filename

923842