Transpositional modulation systems and methods
First Claim
1. A method of demodulating transpositional modulation signals, the method comprising:
- obtaining a digital representation of a transpositional modulated signal;
performing a fast Fourier transform (FFT) on the digital representation of the transpositional modulated signal to obtain a frequency domain representation of the transpositional modulated signal;
identifying at least one sideband of the transpositional modulated signal in the frequency domain representation; and
detecting a data value of the transpositional modulated signal in the at least one sideband to demodulate the transpositional modulated signal.
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Accused Products
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
15 Claims
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1. A method of demodulating transpositional modulation signals, the method comprising:
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obtaining a digital representation of a transpositional modulated signal; performing a fast Fourier transform (FFT) on the digital representation of the transpositional modulated signal to obtain a frequency domain representation of the transpositional modulated signal; identifying at least one sideband of the transpositional modulated signal in the frequency domain representation; and detecting a data value of the transpositional modulated signal in the at least one sideband to demodulate the transpositional modulated signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of demodulating transpositional modulation signals, the method comprising:
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receiving a transpositional modulated signal; obtaining an unmodulated signal at a frequency of a carrier signal of the transpositional modulated signal; subtracting the unmodulated signal from the transpositional modulated signal; filtering the transpositional modulated signal with a notch filter at the frequency of the carrier signal; and detecting a phase modulation of a third harmonic component of the carrier signal to demodulate the transpositional modulation signal, wherein the phase modulation of the third harmonic component represents a TM modulation value. - View Dependent Claims (8)
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9. An transpositional modulation (TM) receiver comprising:
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means for generating a digital representation of a transpositional modulated signal from an analog signal; at least one processor in communication with the means for generating the digital representation of the transpositional modulated signal; and a data store coupled to the at least one processor having instructions stored thereon which, when executed by the at least one processor, causes the at least one processor to perform operations comprising; obtaining the digital representation of the transpositional modulated signal; performing a fast Fourier transform (FFT) on the digital representation of the transpositional modulated signal to obtain a frequency domain representation of the transpositional modulated signal; identifying at least one sideband of the transpositional modulated signal in the frequency domain representation; and detecting a data value of the transpositional modulated signal in the at least one sideband to demodulate the transpositional modulated signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification