DocumentCode :
1338620
Title :
Spatio-temporal blind adaptive multiuser detection
Author :
Chkeif, Ammar ; Abed-Meraim, Karim ; Kawas-Kaleh, Ghassan ; Hua, Yingbo
Author_Institution :
Ecole Nat. Superieure des Telecommun., Paris, France
Volume :
48
Issue :
5
fYear :
2000
fDate :
5/1/2000 12:00:00 AM
Firstpage :
729
Lastpage :
732
Abstract :
We propose blind multiuser detection schemes with antenna arrays, which is based on signal subspace estimation. They are a multichannel extension of the decorrelating and minimum mean-square-error detectors, and therefore they share their immunity to near-far effects. The blind scheme may be seen as an extension of the results in of Wang and Poor (see IEEE Trans. Inform. Theory, vol.44, p.677-90, 1998). However, it is seen that compared with the latter results when spatial diversity is considered, the proposed spatio-temporal detectors offer, with little attendant increase in computational complexity, a better performance. A blind adaptive implementation based on a new orthogonal PAST (projection approximation subspace tracking) algorithm, which is shown to be efficient for subspace tracking, is proposed. Also, we develop a blind estimation of the spatial signature based on the orthogonality between noise and signal subspaces. It is seen that the blind adaptive multiuser detection and blind spatio-temporal signature estimation can he integrated jointly
Keywords :
adaptive antenna arrays; adaptive estimation; adaptive signal detection; code division multiple access; computational complexity; decorrelation; diversity reception; fading channels; least mean squares methods; multipath channels; multiuser channels; tracking; AWGN; adaptive estimation; antenna arrays; blind spatio-temporal signature estimation; code-division multiple-access; computational complexity; decorrelating detector; fading channel; minimum mean-square-error detector; multipath channel; near-far effects immunity; noise subspace; orthogonal PAST algorithm; performance; projection approximation subspace tracking; signal subspace; signal subspace estimation; spatial diversity; spatial signature; spatio-temporal blind adaptive multiuser detection; subspace tracking; synchronous CDMA system; Antenna arrays; Approximation algorithms; Computational complexity; Decorrelation; Detection algorithms; Detectors; Fading; Multiaccess communication; Multiple access interference; Multiuser detection;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/26.843180
Filename :
843180
Link To Document :
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