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Blind MIMO equalization with optimum delay using independent component analysis
Author(s) -
Zarzoso Vicente,
Nandi Asoke K.
Publication year - 2004
Publication title -
international journal of adaptive control and signal processing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.73
H-Index - 66
eISSN - 1099-1115
pISSN - 0890-6327
DOI - 10.1002/acs.792
Subject(s) - mimo , independent component analysis , equalization (audio) , computer science , blind equalization , detector , channel (broadcasting) , multipath propagation , minimum mean square error , algorithm , blind signal separation , electronic engineering , telecommunications , mathematics , artificial intelligence , statistics , engineering , estimator
Abstract Blind space–time equalization of multiuser time‐dispersive digital communication channels consists of recovering the users' simultaneously transmitted data free from the interference caused by each other and the propagation effects, without using training sequences. In scenarios composed of mutually independent non‐Gaussian i.i.d. users' signals, independent component analysis (ICA) techniques based on higher‐order statistics can be employed to refine the performance of conventional linear detectors, as recently shown in a code division multiple access environment ( Signal Process 2002; 82 :417–431). This paper extends these results to the more general multi‐input multi‐output (MIMO) channel model, with the minimum mean square error (MMSE) as conventional equalization criterion. The time diversity introduced by the wideband multipath channel enables a reduction of the computational complexity of the ICA post‐processing stage while further improving performance. In addition, the ICA‐based detector can be tuned to extract each user's signal at the delay which provides the best MMSE. Experiments in a variety of simulation conditions demonstrate the benefits of ICA‐assisted MIMO equalization. Copyright © 2004 John Wiley & Sons, Ltd.