Amplitude enhanced frequency modulation
First Claim
Patent Images
1. 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.
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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.
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Citations
20 Claims
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1. A communication system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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. - View Dependent Claims (8, 9, 10)
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11. A method for transmitting a spectrally efficient signal, comprising:
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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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification