Signal processing of an amplitude-modulated and/or phase-modulated high-frequency signal
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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Abstract
The invention indicates a method for signal processing of an amplitude-modulated and/or phase-modulated high-frequency signal (RF signal), in which the RF signal is broken down into two signals (FM1 and FM2) by relative phase displacement by an angle +β and −β and the signals are amplified before they are added to form a transmission signal, and to a circuit arrangement in which the pure phase-modulated RF signal is multiplied 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.
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Citations
17 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification