Digital slope detector and method

Details Digital slope detector and method Digital slope detector and method

1995-04-21

1998-07-14

Ghebretinsae, T.

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375261, H04L 2706

Patent

active

057815895

ABSTRACT:
A slope detector and method of detecting a slope of the passband signal spectrum in a quadrature amplitude modulation (QAM) digital radio system. The detector operates in baseband for comparing signal output powers of upper and lower sidebands of a received passband signal. The slope detector includes transversal filters for filtering I and Q channel inputs and multipliers and combiners for processing the filter outputs to provide an output that is indicative of the slope of the passband signal spectrum. The output may be a value that is translated to an instantaneous slope, or may be tri-state and indicate whether the slope is positive, zero, or negative.

REFERENCES:
patent: 4199728 (1980-04-01), Carpenter
patent: 4647864 (1987-03-01), Rafferty et al.
patent: 4812850 (1989-03-01), Gunton et al.
Lankl et al. "Fully Digital Adaptive Slope Equalizer for Advanced Digital"pp. 1528-33, IEEE Jun. 1992.
"A VLSI Demodulator for Digital RF Network Applications": Saulnier et al. IEEE vol. 8 No. 8 Oct. 1990.

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