Method for estimating phase in demodulator

Details Method for estimating phase in demodulator Method for estimating phase in demodulator

1999-04-15

2000-08-15

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

329308, 375327, 375329, 375365, 375376, H03D 300, H04L 2722

Patent

active

061042374

ABSTRACT:
A signal from a local oscillator is separated by a 90.degree. phase sifter into an in-phase component and an orthogonal component. Each of the components is multiplied by a received IF signal in a mixer to perform pseudo-synchronous detection. The pseudo-synchronously detected signals are subjected to A/D conversion in an A/D converter, and preamble portions are integrated in integrating circuits. The integrated signals are latched in latch circuits. The timing of the latch is controlled by a timing circuit. A power detector detects the power of the latched signal, and the maximum value is detected in a maximum value detector to determine timing at which the power becomes maximum in selectors. A phase (.theta.) is determined from the inverse tangent of the maximum value, and is used as an initial value of a voltage controlled oscillator (VCO) in a demodulator. By virtue of the above construction, a method for estimating a phase in a demodulator can be provided which can accurately demodulate a received burst signal with small circuit size and memory.

REFERENCES:
patent: 4466108 (1984-08-01), Rhodes
patent: 5170415 (1992-12-01), Yoshida et al.
patent: 5815541 (1998-09-01), Fukushi

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