Demodulator using quasi-synchronous detection to demodulate modu

Details Demodulator using quasi-synchronous detection to demodulate modu Demodulator using quasi-synchronous detection to demodulate modu

1997-10-30

2000-03-07

Kinkead, Arnold

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

375344, 375232, 375235, 375324, 329304, H04L 2738

Patent

active

060345640

ABSTRACT:
A demodulator using quasi-synchronous detection to demodulate modulated quadrature input signals. The demodulator has a quasi-synchronous detector detecting a modulated quadrature input signal using an output signal of a fixed frequency from a local oscillator, an equalizer equalizing a quadrature channel signal which is a digital signal converted from the detected quadrature signal from the quasi-synchronous detector, and a phase rotator rotating the phase of the equalized quadrature channel signal output from the equalizer. Furthermore, the demodulator has an equalization control unit to generate a tap factor for the equalizer from the quadrature channel signal equalized by the equalizer, using a signal having substantially the same phase as the input-output signals of the equalizer.

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