An adaptive array for interference rejection

An adaptive array that rejects undesired or interfering signals is presented. The array pattern is controlled by an adaptive feedback system based on a steepest descent minimization of mean-square error. Error is defined as the difference between the array output and a locally generated reference si...

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Bibliographic Details
Published inProceedings of the IEEE Vol. 61; no. 6; pp. 748 - 758
Main Authors Riegler, R.L., Compton, R.T.
Format Journal Article
LanguageEnglish
Published IEEE 01.01.1973
Subjects
Adaptive arrays
Adaptive control
Adaptive systems
Antenna measurements
Control systems
Feedback
Interference
Programmable control
Signal generators
Signal to noise ratio
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ISSN0018-9219
1558-2256
DOI10.1109/PROC.1973.9154

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Summary:An adaptive array that rejects undesired or interfering signals is presented. The array pattern is controlled by an adaptive feedback system based on a steepest descent minimization of mean-square error. Error is defined as the difference between the array output and a locally generated reference signal. Minimization of mean-square error is closely related to maximization of signal-to-noise ratio (SNR). A two-element adaptive array has been built, and its experimental performance is discussed. Typical patterns for various desired and interfering signals are shown, as well as measured transient response. Finally, some experiments showing the array behavior with modulated signals are described. The results show that such an antenna system is capable of automatically rejecting interfering signals, subject only to certain basic constraints. No a priori information about the angles of arrival of the signals is required, Detailed knowledge of the waveforms of the desired and interfering signals is also not needed, although the spectral characteristics of the desired signal must be known.
ISSN:0018-9219
1558-2256
DOI:10.1109/PROC.1973.9154