An Adaptive Nulling System for a Narrow-Band Signal with a Look-Direction Constraint Utilizing the Conjugate Gradient Method

Tapan K. Sarkar, Norachet Sangruji

Research output: Contribution to journalArticle

73 Scopus citations

Abstract

The problem consists of adaptively adjusting the weights of an antenna array to eliminate unwanted interference sources (jammers) with an arbitrary look-direction constraint. The technique uses the adaptive conjugate gradient method instead of the popularly used method of steepest descent to eliminate the jammer components, thus minimizing the error between the received signal and the actual one. This iterative method minimizes the L2 norm, or the mean square error, and is guaranteed to converge in a finite number of steps which is not available for the present techniques utilized to solve this problem. Improvement in rate of convergence is thus achieved at the expense of algorithmic complexity.

Original languageEnglish (US)
Pages (from-to)940-944
Number of pages5
JournalIEEE Transactions on Antennas and Propagation
Volume37
Issue number7
DOIs
StatePublished - Jul 1989

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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