Adaptive nulling in time-modulated linear arrays with minimum power losses

Poli, Lorenzo and Rocca, Paolo and Oliveri, Giacomo and Massa, Andrea (2011) Adaptive nulling in time-modulated linear arrays with minimum power losses. UNSPECIFIED.

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    The synthesis of adaptive time-modulated linear arrays is dealt with by means of an innovative strategy, in which a particle swarm optimiser is used to reconfigure the pulse sequence controlling the static element excitations, as well as the least significant bits of digital phase shifters to maximise the signal-to-interference-plus-noise ratio at the receiver. The reduction of the power content of sideband radiation generated by the periodic on-off commutation of switches is addressed by customising to non-isotropic sources a very effective analytic relationship. A set of selected results is reported and discussed to show the advantages and limitations of the proposed approach. Comparisons with previously published results are also presented. "This paper is a postprint of a paper submitted to and accepted for publication in IET Microwaves, Antennas & Propagation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library:"

    Item Type: Departmental Technical Report
    Department or Research center: Information Engineering and Computer Science
    Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7885 Computer Engineering
    Q Science > QC Physics (General) > QC661 Electromagnetic Theory
    Q Science > QC Physics (General) > QC760 Electromagnetism
    Uncontrolled Keywords: adaptive nulling , digital phase shifters , nonisotropic sources , particle swarm optimiser , power losses , pulse sequence , sideband radiation , signal-to-interference-plus-noise ratio , static element excitations , switch periodic on-off commutation , time-modulated linear arrays
    Report Number: DISI-11-102
    Repository staff approval on: 30 Jun 2011

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