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US 8,300,728 B1Granted
Complex envelope elimination and restoration transmitter
AssigneeRockwell Collins, Inc.
InventorsTheodore J. Hoffmann, David W. Cripe
Life of this patent
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Abstract
The invention is a method of transmitting a radio signal using a complex envelope elimination and restoration technique. The method includes receiving a radio frequency (RF) signal. Further, the method includes separating the RF signal into an in-phase baseband signal (I) and a quadrature baseband signal (Q). Still further, the method includes decomposing the (I) signal into a in-phase magnitude component and a in-phase phase component while decomposing the Q signal into a quadrature magnitude component and a quadrature phase component. Alternatively, the source signal could be digital baseband information. Digital signal processing could generate the phase and magnitude reference signals for the system.
Claims16
A method, comprising:
- receiving an input signal, the input signal being a radio frequency (RF) signal or digital baseband information;
- separating the input signal into an in-phase (I) baseband signal and a quadrature (Q) baseband signal;
- decompose the I signal into an in-phase magnitude component and an in-phase phase component;
- decompose the Q signal into a quadrature magnitude component and a quadrature phase component;
- modulating the in-phase magnitude component and the in-phase phase component of the in-phase baseband signal;
- modulating the quadrature magnitude component and the quadrature phase component of the quadrature baseband signal;
- rectifying the in-phase magnitude component of the in-phase baseband signal;
- rectifying the quadrature magnitude component of the quadrature baseband signal;
- and
- amplifying the in-phase magnitude component and the first in-phase phase component to a first power amplifier, wherein the in-phase magnitude component and the first in-phase phase component are composed as an in-phase modulation on carrier, wherein said modulating is operated directly on the in-phase magnitude component of the decomposed in-phase signal, the in-phase phase component of the decomposed in-phase signal, the quadrature magnitude component of the decomposed quadrature signal and the quadrature phase component of the decomposed quadrature signal.
7 more elements
A device, comprising:
- a signal processor configured for generating and synchronizing a RF signal or digital baseband information input into an in-phase baseband signal and a quadrature baseband signal;
- a first limiter, the first limiter configured for receiving the in-phase baseband signal and eliminating the envelope of the in-phase baseband signal and generating an in-phase phase component;
- a second limiter, the second limiter configured for receiving the quadrature baseband signal and eliminating the envelope of the quadrature baseband signal and generating a quadrature phase component;
- a first envelope detector, the first envelope detector configured for extracting the magnitude component of the in-phase baseband signal and generating a first magnitude phase;
- a second envelope detector, the second envelope detector configured for extracting the magnitude component of the quadrature baseband signal and generating a second magnitude phase;
- a first power modulator, the first power modulator configured for receiving the in-phase magnitude component and generating a bipolar signal capable of positive and negative voltages;
- a second power modulator, the second power modulator configured for receiving the quadrature magnitude component and generating a bipolar signal capable of positive and negative voltages;
- and
- a first power amplifier, the first power amplifier configured for receiving the in-phase magnitude component and the in-phase phase component and generating a in-phase modulation on carrier, wherein the first and second power modulators are operated directly on the in-phase baseband signal and the quadrature baseband signal.
6 more elements
A system for improving transmitter efficiency, comprising:
- a signal source;
- a signal processor configured for generating and synchronizing a RF signal input into an in-phase baseband signal and a quadrature baseband signal;
- a first limiter, the first limiter configured for receiving the in-phase baseband signal and eliminating the envelope of the in-phase baseband signal and generating an in-phase component;
- a second limiter, the second limiter configured for receiving the quadrature baseband signal and eliminating the envelope of the quadrature baseband signal and generating a quadrature component;
- a first envelope detector, the first envelope detector configured for extracting the magnitude component of the in-phase baseband signal and generating a first magnitude phase;
- a second envelope detector, the second envelope detector configured for extracting the magnitude component of the quadrature baseband signal and generating a second magnitude phase;
- a first power modulator, the first power modulator configured for receiving the in-phase magnitude component and generating a bipolar signal capable of positive and negative voltages;
- and
- a second power modulator, the second power modulator configured for receiving the quadrature magnitude component and generating a bipolar signal capable of positive and negative voltages;
- and
- a first power amplifier, the first power amplifier configured for amplifying the in-phase magnitude component and the in-phase component, wherein the first and second power modulators are operated directly on the in-phase baseband signal and the quadrature baseband signal.
8 more elements
Dependencies are inferred from the claim text.