Demodulator

Details Demodulator Demodulator

1999-05-17

2000-09-19

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

329306, 375261, 375325, 375329, 375345, H03D 300, H04L 2738

Patent

active

061218286

ABSTRACT:
It is an object of the invention to provide a demodulator, which improves a BER characteristic in a ordinary state, reduce a time constant of a AGC amplifier, and quickly follows the fluctuation of an input signal level. A demodulator for 2.sup.q -QAM system is composed of an AGC amplifier, which keeps an average power of its output signal constant, A/D convectors for A/D converting the output signal of the AGC amplifier, an equalizer for removing interference components between codes contained in output signals of the A/D convectors, AGC circuits, which operate so that convergent points of output signals of the equalizer have amplitudes expressed by binary numbers composed of q/2 bits, and a control circuit, which is supplied with output signals of the AGC circuits and generates control signals for the AGC circuits.

REFERENCES:
patent: 4669090 (1987-05-01), Betts et al.
patent: 5841814 (1998-11-01), Cupo
patent: 6026127 (2000-02-01), Lewicki et al.

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