Demodulation method and demodulation device

Details Demodulation method and demodulation device Demodulation method and demodulation device

1996-08-20

1998-06-30

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375344, H04L 2714, H04L 2716, H04L 2722

Patent

active

057745030

ABSTRACT:
An oscillator 1 generates a local oscillation signal. A quadrature detector 2 converts an inputted carrier band signal into an equivalent low-frequency signal on the basis of the local oscillation signal. A complex multiplier 3 performs complex multiplication of the equivalent low-frequency signal and a complex coefficient to output a detection signal. An amplitude error detecting portion 4 detects a complex amplitude error of the detection signal. A coefficient error calculating portion 5 calculates a quantity proportional to an error of the complex coefficient from the complex amplitude error and the equivalent low-frequency signal and outputs it. A filter 6 converts the output of the coefficient error detecting portion into a complex coefficient and provides it to the complex multiplier 3. A data regenerating portion 7 converts the detection signal into demodulation data and outputs it.

REFERENCES:
patent: 4620160 (1986-10-01), Waggener
patent: 4953186 (1990-08-01), Levy et al.
patent: 5142287 (1992-08-01), LaBerge et al.
patent: 5311546 (1994-05-01), Paik et al.
patent: 5434884 (1995-07-01), Rushing et al.
M. Uchishima et al., "Burst DSP Demodulator for Low Eb/No Operation", Conf. Rec. IEEE Int. Conf. Commun. vol. 1991, No. vol. 1, pp. 226-230, 1991.

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