On the constrained stochastic gradient algorithm behavior in wireless communication networks

Author

Kolodziej, Javier E. ; Tobias, Orlando J. ; Seara, Rui ; Morgan, Dennis R.

Author_Institution

Electr. Eng. Dept., LINSE - Circuits & Signal Process. Lab., Univ. Fed. de Santa Catarina, Florianopolis

fYear

2008

fDate

6-9 July 2008

Firstpage

226

Lastpage

230

Abstract

The purpose of this paper is to report on an unsuitable behavior of the constrained stochastic gradient (CSG) algorithm for adaptive beamforming in the combination of two events: one or more interference angles-of-arrival are close to the signal angle-of-arrival and the angle spreads of the involved signals are small. In this situation, the CSG algorithm stresses the co-channel interference minimization more than the maximization of the power radiated to the in-cell mobile terminal. We term this phenomenon unbalanced behavior and provide an analytical study to explain it.

Keywords

adaptive signal processing; cellular radio; cochannel interference; direction-of-arrival estimation; gradient methods; interference suppression; stochastic processes; adaptive beamforming; angles-of-arrival; cochannel interference; constrained stochastic gradient algorithm; in-cell mobile terminal; wireless communication networks; Antenna arrays; Array signal processing; Covariance matrix; Interchannel interference; Minimization methods; Signal processing; Signal processing algorithms; Stochastic processes; Stress; Wireless communication; Adaptive signal processing; antenna arrays; mobile communication; modeling;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Advances in Wireless Communications, 2008. SPAWC 2008. IEEE 9th Workshop on

Conference_Location

Recife

Print_ISBN

978-1-4244-2045-2

Electronic_ISBN

978-1-4244-2046-9

Type

conf

DOI

10.1109/SPAWC.2008.4641603

Filename

4641603