00000nam 2200000zi 4500 9.892625 CaOODSP 20221107173225 m o d f cr bn||||||||| 201020s1984 onca ob f000 0 eng d CaOODSP eng rda CaOODSP Co24-3/8-725-1984E-PDF Jenkins, Robert W., author. Implementing a matrix-inversion algorithm in a limited-precision adaptive antenna array processor / by Robert W. Jenkins. Ottawa : Communications Research Centre, 1984. 1 online resource (iii, 20 pages) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier CRC technical note ; no. 725 "Directorate of Military Communications." "December 1984." "This work was sponsored by the Department of National Defence, Research Development Branch, under Project No. 32B75." Digitized edition from print [produced by Innovation, Science and Economic Development Canada]. Includes bibliographical references (page 18). "The effect of computation accuracy on the performance of a small adaptive antenna system using a digitally-implemented matrix inversion algorithm is examined. A single-board array processor with 16-bit mantissa floating-point accuracy is compared with a VAX-11/750 computer having 24-bit accuracy in the single-precision mode, and 56-bit accuracy in the double-precision mode. The effects of limited precision on array performance are worse when the signal covariance matrix to be inverted is ill-conditioned (i.e., nearly singular), as is the case with an n-element array in the presence of less than n unrelated signals and a low system noise level. Using a simulated signal environment consisting of a wanted communications signal, a single jamming signal, and a variable system noise level, the performance of the array is evaluated. A need for about -20 dB of artificially-injected system noise (relative to the total signal) is demonstrated in the case of the singleboard array processor, in order that the covariance matrix be sufficiently well-conditioned for adequate array performance"--Abstract, page 1. Issued also in print format. Adaptive antennas Simulation methods. Antenna arrays Simulation methods. Matrix inversion Data processing. Computer algorithms. Antennes adaptatives Méthodes de simulation. Antennes-réseaux Méthodes de simulation. Matrices Inversion Informatique. Algorithmes. Communications Research Centre (Canada), issuing body. CRC technical note ; no. 725. (CaOODSP)9.882494 PDF 1.07 MB https://publications.gc.ca/collections/collection_2020/isde-ised/Co24/Co24-3-8-725-1984-eng.pdf