Demodulation system capable of establishing synchronization in a

Details Demodulation system capable of establishing synchronization in a Demodulation system capable of establishing synchronization in a

1986-08-15

1988-07-12

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329109, 329135, 375 39, H03D 318, H03K 910

Patent

active

047572663

ABSTRACT:
In a demodulation system comprising a demodulator (22) which demodulates a quadrature amplitude modulated signal into first and second sets of output digital signals by the use of a reference carrier signal (CA), a specific phase control signal is produced in a transient state by discriminating a plurality of areas and a plurality of zones defined on a phase plane of the modulated signal. The areas are defined by dividing the phase plane by both a pair of quadrant reference axes and a pair of auxiliary reference axes phase shifted by .pi./4 (radians) relative to the quadrant decision axes. The zones are defined along and adjacent to the auxiliary reference axes. First and second detection signals (S.sub.1 and S.sub.2) are produced by a read-only memory (35) as results of discrimination of the areas and the zones, respectively. The specific phase control signal is switched to a normal phase control signal produced in a normal state in the known manner. Alternatively, the first and the second detection signals may be supplied to a transversal equalizer (21) for controlling imaginary part weighting control signals.

REFERENCES:
patent: 4255713 (1981-03-01), Yoshida

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