Asynchronous quadrature demodulator

Details Asynchronous quadrature demodulator Asynchronous quadrature demodulator

1991-03-07

1992-09-22

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375102, 329304, H04L 2706

Patent

active

051503832

ABSTRACT:
An asynchronous quadrature demodulator which comprises an asynchronous quadrature detector, a frequency compensating circuit for estimating and compensating a frequency offset between an oscillating frequency of a local oscillator of the asynchronous quadrature detector and a frequency of a received carrier frequency on the basis of correcting signals, a base band complex equalizer for eliminating a transmission-channel distortion due to a multiplex transmission and a data demodulator. Thereby, a reference carrier recovery circuit becomes unnecessary. Thus, the structure of the demodulator can be simplified. Further, the demodulator can stably operate on the transmission channel.

REFERENCES:
patent: 4253186 (1981-02-01), Godard
patent: 4262360 (1981-04-01), Bigo et al.
patent: 4796279 (1989-01-01), Betts et al.
patent: 5022053 (1991-06-01), Chung et al.
patent: 5029186 (1991-07-01), Maseng et al.
S. Sampei et al "Rayleigh Fading Compensation Method For 18 QAM In Digital Land Mobil & Radio Channels" 39th IEEE Vehicular Technology Conference, vol. II pp. 640-646 May 1989.
"Digital Microwave Communication", by M. Kuwabara and published by Kabishiki-kaisha Kikaku Centre in 1974.

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