Pulse or digital communications – Repeaters – Testing
Patent
1992-02-14
1994-11-29
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375 80, 375 94, 370 23, 382 43, 364726, H03D 302, H04L 2722, G06F 15332
Patent
active
053696700
ABSTRACT:
A method and apparatus for estimating the phase differential of a transmitted electromagnetic signal from the amplitude envelope of the signal. The apparatus includes a sampler, phase estimator and demodulator. The phase estimator uses a Hilbert transform or an approximation of the Hilbert transform to estimate the phase differential. The method may be applied to time domain or frequency domain signals. The phase differential is estimated by taking the differential of a function of the envelope, and applying the Hilbert transform to this differential. The resulting phase differential, after correction for sign ambiguity may be used to demodulate the received signal.
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patent: 5089982 (1992-02-01), Gran et al.
"Estimation of Phase Differential of Signals Transmitted over Fading Channels", Electronic Letters, vol. 27, No. 20, pp. 1823-1824, Sep. 1991.
M. A. Poletti, et al., "Reduction of Multipath Fading Effects in Single Variable Modulations", I.S.S.P.A.-90, Signal Processing Theories, pp. 672-676, 27-31, Aug. 1990.
Fattouche Michel
Zagloul Hatim
AGT Limited
Chin Stephen
Tse Young
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