Modulation system
First Claim
1. A modulation system comprising:
- a first constant envelope modulator modulating a signal according to a first control signal;
a second constant envelope modulator modulating a signal according to a second control signal; and
a combining portion combining output signals of said first and said second constant envelope modulators to a single, two-level pulse-width-modulated signal, wherein information for representation by a modulation of said single, two-level pulse-width-modulated signal is coded in said first and said second control signals.
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Abstract
In a modulation system,.in order to provide a two-level signal with a desired modulation which is suited to be amplified by a switching mode power amplifier, the modulation system may include a first constant envelope modulator modulating a signal according to a first control signal, a second constant envelope modulator modulating a signal according to a second control signal, and a combining portion combining the output signal of the first and said second constant envelope modulator to a single, two-level pulse-width-modulated signal. The information which is to be represented by the modulation of the single, two-level pulse-width-modulated signal is coded in the first and the second control signals. The invention relates equally to a corresponding method for generating a modulated signal.
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Citations
19 Claims
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1. A modulation system comprising:
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a first constant envelope modulator modulating a signal according to a first control signal;
a second constant envelope modulator modulating a signal according to a second control signal; and
a combining portion combining output signals of said first and said second constant envelope modulators to a single, two-level pulse-width-modulated signal, wherein information for representation by a modulation of said single, two-level pulse-width-modulated signal is coded in said first and said second control signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for generating a modulated signal, said method comprising:
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modulating a signal according to a first control signal to obtain a first modulated constant envelope signal;
modulating a signal according to a second control signal to obtain a second modulated constant envelope signal; and
combining said first modulated constant envelope signal and said second modulated constant envelope signal into a single, two-level pulse-width-modulated signal, wherein information for representation by a modulation of said single, two-level pulse-width-modulated signal is coded in said first control signal and said second control signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification