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Signal processing of an amplitude-modulated and/or phase-modulated high-frequency signal

  • US 7,139,535 B2
  • Filed: 01/16/2002
  • Issued: 11/21/2006
  • Est. Priority Date: 01/16/2001
  • Status: Expired due to Fees
First Claim
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1. A method of signal processing of an amplitude-modulated or phase-modulated high-frequency signal (RF signal), comprising the steps of:

  • (a) breaking the RF signal down into two signals (FM1 and FM2) by relative phase displacement by an angle of +β and



    β

    ;

    (b) amplifying the signals to form two amplified signals;

    (c) adding the amplified signals to form a transmission signal,wherein;

    step (a) comprises multiplying a phase-modulated RF signal with constant envelope curve in a first branch by cos β and

    in a second branch by sin β and

    the two signals FM1, FM2, are obtained by respective summation and subtraction of the multiplied signals;

    the RF signal is obtained from two amplitude-modulated and phase-modulated input signals (x1(t), x2(t)) by quadrature modulation, wherein the individual signals after modulation by a sine and a cosine are added;

    the input signals (x1(t) and x2(t)) are scanning values; and

    in the case of approach of the scanning values of the input signals (x1 and x2) towards or through zero or when an envelope curve signal (A(t)) goes towards or through zero the received signals(x1, x2) are replaced by input signals modified by means of subtraction of adjacent scanning values.

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