Coherent demodulator preceded by non-coherent demodulator and au

Details Coherent demodulator preceded by non-coherent demodulator and au Coherent demodulator preceded by non-coherent demodulator and au

1992-08-26

1994-03-22

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

329308, 329325, 329346, 375 81, H04L 2722

Patent

active

052968200

ABSTRACT:
A non-coherent demodulator 1 multiplies a modulated intermediate frequency (IF) signal with a signal from a local oscillator 2 to produce a first pseudo baseband signal having frequency error. The first pseudo baseband signal is supplied to a wide band PLL type demodulator 15. A low-pass filter 26 removes noise component from a first control signal from a loop filter 19 in the wide band PLL type demodulator 15 to produce a second control signal. Multipliers 24 and 25 multiply the first pseudo baseband signal with an output of a voltage-controlled oscillator 27 controlled by the second control signal to produce a second pseudo baseband signal having smaller frequency error. The second pseudo baseband signal is supplied to a narrow band demodulator 14 and converted into a baseband signal.

REFERENCES:
patent: 3371281 (1968-02-01), Powell
patent: 5128626 (1992-07-01), Iwasaki

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