TRANSPOSITIONAL MODULATION SYSTEMS AND METHODS
First Claim
1. A method of generating a signal, comprising the steps of:
- providing a look-up table having a plurality of quarter-cycle waveforms, each of said quarter-cycle waveforms associated with a respective input level;
receiving an input signal; and
outputting quarter-cycle waveforms associated with levels of the received input signal.
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Abstract
Systems and methods for transpositional modulation and demodulation are provided. One such method for generating a signal includes the steps of providing a look-up table having a plurality of quarter-cycle waveforms, each of said quarter-cycle waveforms associated with a respective input level; receiving an input signal; and outputting quarter-cycle waveforms associated with levels of the received input signal. Systems for transpositional modulation are also provided. One such system for generating a signal includes a look-up table having a plurality of quarter-cycle waveforms. Each of the quarter-cycle waveforms are associated with a respective input level, and the look-up table is configured to receive an input signal, and output quarter-cycle waveforms associated with levels of the received input signal.
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Citations
16 Claims
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1. A method of generating a signal, comprising the steps of:
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providing a look-up table having a plurality of quarter-cycle waveforms, each of said quarter-cycle waveforms associated with a respective input level; receiving an input signal; and outputting quarter-cycle waveforms associated with levels of the received input signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method for generating a modulated signal, comprising the steps of:
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receiving an carrier signal; receiving an input signal; generating a third harmonic sideband based on the received signals; and frequency-shifting the third harmonic sideband to the frequency of the received carrier signal.
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7. A method of demodulating a signal, comprising the steps of:
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filtering out all but the third harmonic component from the modulated signal; and detecting the phase of the third harmonic component.
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8. A method of demodulating a signal, comprising the steps of:
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converting the modulated signal to a digital signal; performing a fast Fourier transform on the digital signal.
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9. A system for generating a signal, comprising:
a look-up table having a plurality of quarter-cycle waveforms, each of said quarter-cycle waveforms associated with a respective input level, wherein said look-up table is configured to receive an input signal, and output quarter-cycle waveforms associated with levels of the received input signal. - View Dependent Claims (10, 11, 12, 13)
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14. A system for generating a modulated signal, comprising:
a processor configured to generate a third harmonic sideband based on a received carrier signal and a received input signal, and to frequency-shift the third harmonic sideband to the frequency of the received carrier signal.
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15. A system for demodulating a signal, comprising:
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a subtraction element for subtracting a fundamental carrier signal from a received modulated signal; a fundamental notch filter for filtering out the fundamental carrier signal, thereby leaving only the third harmonic component from the modulated signal; and a third harmonic phase detector for detecting the phase of the third harmonic component.
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16. A system for demodulating a signal, comprising:
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an analog to digital converter for converting the modulated signal to a digital signal; and a processor configured to perform a fast Fourier transform on the digital signal.
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Specification