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.
2 Assignments
0 Petitions
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 to quarter-cycle waveforms associated with levels of the received input signal.
-
Citations
29 Claims
-
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. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method of generating a signal, comprising the steps of:
-
receiving a carrier signal; receiving an input signal; generating quarter-cycle waveforms based on the input signal; and assembling the generated quarter-cycle waveforms into a continuous output signal, wherein the output signal includes a first inflection between adjacent quarter-cycles forming a segment of the output signal between a first negative peak and a positive peak, and wherein the output signal includes a second inflection between adjacent quarter-cycles forming a segment of the output signal between the positive peak and a second negative peak, wherein said first and second inflections represent a level of said input signal. - View Dependent Claims (7, 8, 9, 10)
-
-
11. A method for generating a modulated signal, comprising the steps of:
-
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.
-
-
12. A method of demodulating a signal, comprising the steps of:
-
adding a third harmonic to the modulated signal; detecting a peak amplitude of the modulated signal plus third harmonic; generating a reference ramp when a peak amplitude is detected; detecting an inflection in the modulated signal plus third harmonic; sampling the reference ramp when an inflection is detected; and holding and outputting the sampled value. - View Dependent Claims (13)
-
-
14. A method of demodulating a signal, comprising the steps of:
-
filtering out all but the third harmonic component from the modulated signal; and detecting the phase of the third harmonic component.
-
-
15. A method of demodulating a signal, comprising the steps of:
-
converting the modulated signal to a digital signal; performing a fast Fourier transform on the digital signal.
-
-
16. 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 (17, 18, 19, 20)
-
21. A system for generating a signal, comprising:
-
a waveform generator configured to generate quarter-cycle waveforms based on a received carrier signal and a received input signal; and an analog gate for assembling the generated quarter-cycle waveforms into a continuous output signal, wherein the output signal includes a first inflection between adjacent quarter-cycles forming a segment of the output signal between a first negative peak and a positive peak, and wherein the output signal includes a second inflection between adjacent quarter-cycles forming a segment of the output signal between the positive peak and a second negative peak, wherein said first and second inflections represent a level of said input signal. - View Dependent Claims (22, 23, 24)
-
-
25. 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.
-
26. A system for demodulating a signal, comprising:
-
a signal adder for adding a third harmonic to the modulated signal; a peak detector for detecting a peak amplitude of the modulated signal plus third harmonic; a reference ramp generator for generating a reference ramp when a peak amplitude is detected; an inflection detector for detecting an inflection in the modulated signal plus third harmonic; and a sample and hold element for sampling the reference ramp when an inflection is detected, and holding and outputting the sampled value. - View Dependent Claims (27)
-
-
28. A system for demodulating a signal, comprising:
-
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.
-
-
29. A system for demodulating a signal, comprising:
-
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.
-
Specification