A SAW-BASED DEMODULATOR FOR MULTIPLE-USER DEHOPPED M-ARY FSK SIGNALS - IMPLEMENTATION AND MEASUREMENTS

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Authors
  1. Felstead, E.B.
  2. Pearce, J.L.
  3. Selin, D.L.
Corporate Authors
Communications Research Centre, Ottawa ONT (CAN)
Abstract
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 an analog chirp transformer implemented with surface acoustic-wave devices. Demodulation of M=4-, 8-, and 16-ary FSK signals of 25-mu s symbol duration was demonstrated with capability of handling up to 40/M users. An 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 alpha = 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.
Report Number
TR-1392 — DRP-85-144
Date of publication
15 Jun 1985
Number of Pages
48
DSTKIM No
86-00407
CANDIS No
106031
Format(s):
Hardcopy;Originator's fiche received by DSIS;Document Image stored on Optical Disk

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