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US 2013/0259148 A1Published application
Amplitude enhanced frequency modulation
AssigneeGeneral Electric Company
InventorRichard Alan Place
Life of this patent
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Abstract
Methods and systems for transmitting a spectrally efficient signal. The method includes frequency modulating an input signal in a transmitter to generate a first frequency modulated (FM) signal and generating in the transmitter an amplitude modulated (AM) component based at least on the input signal. The method may then include generating a second FM signal based at least on the AM component and the first FM signal and sending the second FM signal to a receiver.
Claims20
A communication system comprising:
- a transmitter, comprising:
- a frequency modulator configured to generate a first frequency modulated (FM) signal based at least on an input signal;
- a component configured to generate an amplitude modulated (AM) component based at least on the input signal;
- and
- an amplitude modulator configured to add the AM component to the first FM signal thereby generating a second FM signal;
- wherein the transmitter is configured to send the second FM signal to a receiver.
3 more elements
A communication system comprising:
- a transmitter, comprising:
- a digital signal processor (DSP) configured to:
- generate an inphase (I) signal and quadrature phase (Q) signal using a frequency modulation, wherein the I signal and the Q signal comprise at least a first sideband component and a second sideband component;
- and
- remove the second sideband component from the I signal and the Q signal, thereby generating a filtered I signal and a filtered Q signal;
- and
- a complex modulator configured to generate a frequency modulated (FM) signal based at least on the filtered I signal and the filtered Q signal, wherein the transmitter sends the FM signal to a receiver.
4 more elements
A method for transmitting a spectrally efficient signal, comprising:
- frequency modulating an input signal in a transmitter to generate a first frequency modulated (FM) signal;
- generating in the transmitter an amplitude modulated (AM) component based at least on the input signal;
- generating a second FM signal based at least on the AM component and the first FM signal;
- and
- sending the second FM signal to a receiver.
2 more elements
Dependencies are inferred from the claim text.