Coherent receiver for angle-modulated data signals

Details Coherent receiver for angle-modulated data signals Coherent receiver for angle-modulated data signals

H - Electricity

04

B

325/87

H04B 1/16 (2006.01) H04L 27/233 (2006.01) H04L 27/00 (2006.01)

Patent

CA 1157101

ABSTRACT A receiver for angle-modulated signals of the type a sin ((.omega.) t + ? (t)), comprising a frequency transposition stage incorporating a local oscillator. A frequency shift .DELTA..omega. of the local oscillator rela- tive to the carrier frequency .omega. may cause the angle modulation signal ?(t) to become faded. An argument detector produces ehe signal [? (t) + (.DELTA..omega.) t] which is differentiated by a differentiator to provide the signal [d ?(t)/dt + .DELTA..omega.]. A DC-shift detector determines the DC- component .DELTA..omega. of this signal. This component is integrated by an integrator to provide the signal (.DELTA..omega.) t, which is thereafter subtracted by difference producer from the output signal of the argument detector to provide a clear angle modulation signal. This receiver is suitable for use in systems for the radio transmission of data signals.

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