A SAW-based Demodulator for Dehopped FDMA M-ary FSK Satellite Signals
- 1 October 1986
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
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 a chirp transformer implemented with surface acoustic-wave devices. Demodulation of M=4-, 8-, and 16-ary FSK signals of 25 ps 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.Keywords
This publication has 4 references indexed in Scilit:
- Antijam Performance of Fast Frequency-Hopped M-ary NCFSK--An OverviewIEEE Journal on Selected Areas in Communications, 1986
- The theory, design, and applications of surface acoustic wave Fourier-transform processorsProceedings of the IEEE, 1980
- Receiver Windowing for FDM MFSK SignalsIEEE Transactions on Communications, 1979
- On the use of windows for harmonic analysis with the discrete Fourier transformProceedings of the IEEE, 1978