Transpositional modulation systems and methods
First Claim
1. A method of modulating a carrier signal, the method comprising:
- receiving an input signal;
obtaining, from a look-up-table, sets of quarter-cycle waveforms, wherein each set represents a modulation level for the carrier signal based on a respective value of the input signal; and
assembling the set of quarter-cycle waveforms into a continuous output signal to produce a modulated carrier 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.
45 Citations
14 Claims
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1. A method of modulating a carrier signal, the method comprising:
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receiving an input signal; obtaining, from a look-up-table, sets of quarter-cycle waveforms, wherein each set represents a modulation level for the carrier signal based on a respective value of the input signal; and assembling the set of quarter-cycle waveforms into a continuous output signal to produce a modulated carrier signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for generating a modulated signal, the method comprising:
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receiving a carrier signal and an input signal; generating, based on the input signal, a sideband spectrum at a third harmonic of a fundamental frequency of the carrier signal, the sideband spectrum representing a transpositional modulated signal; and mixing the sideband spectrum with a second harmonic signal of the carrier signal to frequency-shift the sideband spectrum to the fundamental frequency of the carrier signal to produce a transpositional modulated carrier signal.
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8. A system comprising:
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at least one processor; 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; receiving an input signal; obtaining, from a look-up-table, sets of quarter-cycle waveforms, wherein each set represents a modulation level for a carrier signal based on a respective value of the input signal; and assembling the set of quarter-cycle waveforms into a continuous output signal to produce a modulated carrier signal. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A system comprising:
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at least one processor; 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; receiving a carrier signal and an input signal; generating, based on the input signal, a sideband spectrum at a third harmonic of a fundamental frequency of the carrier signal, the sideband spectrum representing a transpositional modulated signal; and mixing the sideband spectrum with a second harmonic signal of the carrier signal to frequency-shift the sideband spectrum to the fundamental frequency of the carrier signal to produce a transpositional modulated carrier signal.
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Specification