Transmitter and method for transmitting a modulated wave with variable envelope
First Claim
Patent Images
1. A transmitter comprising:
- means for converting a signal of said modulating signal with envelope variation of which in-phase component signal is I and quadrature component signal is Q to a signal of which in-phase component signal is I1, and quadrature component signal is Q1 and a signal of which in-phase component signal is I2, and quadrature component signal is Q2 that meet the following conditions (1) to (3);
space="preserve" listing-type="equation">(I.sub.1).sup.2 +(Q.sub.1).sup.2 =constant (1)
space="preserve" listing-type="equation">(I.sub.2).sup.2 +(Q.sub.2).sup.2 =constant (2)
space="preserve" listing-type="equation">Vector (I,Q)=Vector (I.sub.1,Q.sub.1)+Vector (I.sub.2,Q.sub.2) (3)a first modulation means for modulating a carrier with said signal (I1,Q1) and generating a first modulated wave;
a second modulation means for modulating a carrier with said signal (I2,Q2) and generating a second modulated wave;
a first amplification means for power amplifying said first modulated wave;
a second amplification means for power amplifying said second modulated wave; and
means for composing output signals of said first amplification means and said second amplification means.
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Abstract
A base band waveform generation circuit 10 calculates the equations: I1 ={I+Q·SQRT(4/a2 -1)}/2; Q1 ={Q-I·SQRT(4/a2 -1)}/2; I2 ={I-Q·SQRT(4/a2 -1)}/2; and Q2 ={Q+I·SQRT(4/a2 -1)}/2, based on I and Q of a modulating signal. Where, SQRT(x) refers to a square root of x, that is, a2 =(I2)2 +(Q2)2. A quadrature modulator 12 quadrature modulates a carrier with the I1 and Q1. A quadrature modulator 22 quadrature modulates a carrier with the I2 and Q2. The output signals of the quadrature modulators 12 and 13 are amplified with a transmission power amplifiers 13 and 23, then composed.
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Citations
14 Claims
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1. A transmitter comprising:
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means for converting a signal of said modulating signal with envelope variation of which in-phase component signal is I and quadrature component signal is Q to a signal of which in-phase component signal is I1, and quadrature component signal is Q1 and a signal of which in-phase component signal is I2, and quadrature component signal is Q2 that meet the following conditions (1) to (3);
space="preserve" listing-type="equation">(I.sub.1).sup.2 +(Q.sub.1).sup.2 =constant (1)
space="preserve" listing-type="equation">(I.sub.2).sup.2 +(Q.sub.2).sup.2 =constant (2)
space="preserve" listing-type="equation">Vector (I,Q)=Vector (I.sub.1,Q.sub.1)+Vector (I.sub.2,Q.sub.2) (3)a first modulation means for modulating a carrier with said signal (I1,Q1) and generating a first modulated wave; a second modulation means for modulating a carrier with said signal (I2,Q2) and generating a second modulated wave; a first amplification means for power amplifying said first modulated wave; a second amplification means for power amplifying said second modulated wave; and means for composing output signals of said first amplification means and said second amplification means. - View Dependent Claims (2, 3, 4)
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5. A transmitter comprising:
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means for converting a signal of said modulating signal (I,Q) to a signal (I1,Q1) and a signal (I2,Q2) by applying the following equations (1) to (4);
space="preserve" listing-type="equation">I.sub.1 ={I+Q·
SQRT(4/a.sup.2 -1)}/2 (1)
space="preserve" listing-type="equation">Q.sub.1 ={Q-I·
SQRT(4/a.sup.2 -1)}/2 (2)
space="preserve" listing-type="equation">I.sub.2 ={I-Q·
SQRT(4/a.sup.2 -1)}/2 (3)
space="preserve" listing-type="equation">Q.sub.2 ={Q+I·
SQRT(4/a.sup.2 -1)}/2 (4);where, SQRT(x) refers to a square root of x, that is, a2 =(I2)2 +(Q2)2 a first quadrature modulation means for quadrature modulating a carrier with said signal (I1,Q1) and generating a first modulated wave; a second quadrature modulation means for quadrature modulating a carrier with said signal (I2,Q2) and generating a second modulated wave; a first non-linear power amplifier power amplifying said first modulated wave; a second non-linear power amplifier power amplifying said second modulated wave; and means for composing output signals of said first non-linear power amplifier and said second non-linear power amplifier.
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6. A method for transmitting a modulated wave with envelope variation, said method comprising the steps of:
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converting a signal of said modulating signal with envelope variation of which in-phase component signal is I and quadrature component signal is Q to a signal of which in-phase component signal is I1, and quadrature component signal is Q1 and a signal of which in-phase component signal is I2, and quadrature component signal is Q2 that meet the following conditions (1) to (3);
space="preserve" listing-type="equation">(I.sub.1).sup.2 +(Q.sub.1).sup.2 =constant (1)
space="preserve" listing-type="equation">(I.sub.2).sup.2 +(Q.sub.2).sup.2 =constant (2)
space="preserve" listing-type="equation">Vector (I,Q)=Vector (I.sub.1,Q.sub.1)+Vector (I.sub.2,Q.sub.2) (3);a first modulation step of modulating a carrier with said signal (I1,Q1) and generating a first modulated wave; a second modulation step of modulating a carrier with said signal (I2,Q2) and generating a second modulated wave; a first amplification step of power amplifying said first modulated wave; a second amplification step of power amplifying said second modulated wave; composing said first power amplified modulated wave and said second power amplified modulated wave; band limiting a composed modulated wave; and transmitting a band limited modulated wave. - View Dependent Claims (7, 8, 9)
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10. A transmitter comprising:
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a converter converting a signal of said modulating signal with envelope variation of which in-phase component signal is I and quadrature component signal is Q to a signal of which in-phase component signal is I1, and quadrature component signal is Q1 and a signal of which in-phase component signal is I2, and quadrature component signal is Q2 that meet the following conditions (1) to (3);
space="preserve" listing-type="equation">(I.sub.1).sup.2 +(Q.sub.1).sup.2 =constant (1)
space="preserve" listing-type="equation">(I.sub.2).sup.2 +(Q.sub.2).sup.2 =constant (2)
space="preserve" listing-type="equation">Vector (I,Q)=Vector (I.sub.1,Q.sub.1)+Vector (I.sub.2,Q.sub.2) (3),a first modulator modulating a carrier with said signal (I1,Q1) and generating a first modulated wave; a second modulator modulating a carrier with said signal (I2,Q2) and generating a second modulated wave; a first amplifier power amplifying said first modulated wave; a second amplifier power amplifying said second modulated wave; and a composition device composing output signals of said first amplifier and said second amplifier. - View Dependent Claims (11, 12, 13)
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14. A transmitter comprising:
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a converter converting a signal of said modulating signal (I,Q) to a signal (I1,Q1) and a signal (I2,Q2) by applying the following equations (1) to (4);
space="preserve" listing-type="equation">I.sub.1 ={I+Q·
SQRT(4/a.sup.2 -1)}/2 (1)
space="preserve" listing-type="equation">Q.sub.1 ={Q-I·
SQRT(4/a.sup.2 -1)}/2 (2)
space="preserve" listing-type="equation">I.sub.2 ={I-Q·
SQRT(4/a.sup.2 -1)}/2 (3)
space="preserve" listing-type="equation">Q.sub.2 ={Q+l·
SQRT(4/a.sup.2 -1)}/2 (4),where, SQRT(x) refers to a square root of x, that is, a2 =(I2)2 +(Q2 )2 ; a first quadrature modulator quadrature modulating a carrier with said signal (I1,Q1) and generating a first modulated wave; a second quadrature modulator quadrature modulating a carrier with said signal (I2,Q2) and generating a second modulating wave; a first non-linear power amplifier power amplifying said first modulated wave; a second non-linear power amplifier power amplifying said second modulated wave; and a composition device composing output signals of said first non-linear power amplifier and said second non-linear power amplifier.
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Specification