00000nam 2200000zi 4500 9.895061 CaOODSP 20221107173924 m o d f cr bn||||||||| 210106e198506 onca obt f000 0 eng d CaOODSP eng rda CaOODSP Co24-3/7-1392-1985E-PDF Felstead, E. B. (E. Barry), 1940- author. A SAW-based demodulator for multiple-user dehopped M-ary FSK signals - implementation and measurements / by E.B. Felstead, J.L. Pearce, and D.L. Selin. Ottawa : Communications Research Centre, June 1985. 1 online resource (iii, 46 pages) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier CRC report ; no. 1392 "Space Technology and Applications Branch." "This document was prepared for and is the property of the Department of National Defence, Research and Development Branch under Project No. 32A58." Digitized edition from print [produced by Innovation, Science and Economic Development Canada]. Includes bibliographical references (page 34). "A demodulator has been built and tested that is capable of performing the functions of an onboard-the-satellite processor for receiving M-ary noncoherent FSK signals with multiple users being separated by FDMA. It is based on spectral analysis of the received signal by a chirp transformer implemented with surface acoustic-wave devices. Demodulation of M=4-, 8-, and 16-ary FSK signals of 25 µs symbol duration was demonstrated with capability of handling up to 40/M users. The implementation loss was only 0.5 dB. Measurement of bit error rate performance in the presence of system noise, frequency errors, and partial-band-noise and multiple-tone jamming were made and found to agree well with theory. The effects were examined of three different time windows: rectangular, Kaiser Bessel α = 1.6, and one intermediate between these two. The intermediate window is promising because of low window loss combined with good adjacent channel interference tolerance"--Abstract, page 1. Issued also in print format. Radio detectors. Acoustic surface wave devices. Artificial satellites in telecommunication. Démodulateurs. Dispositifs à ondes acoustiques de surface. Satellites artificiels dans les télécommunications. Communications Research Centre (Canada), issuing body. CRC report ; no. 1392. (CaOODSP)9.882492 PDF 2.06 MB https://publications.gc.ca/collections/collection_2021/isde-ised/co24/Co24-3-7-1392-1985-eng.pdf