Transpositional modulation systems and methods

• US 9,787,510 B2
• Filed: 03/03/2016
• Issued: 10/10/2017
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: TM IP Holdings LLC
• Original Assignee: TM IP Holdings LLC
• Inventors: Gerdes, Richard C.
• Primary Examiner(s): Ghulamali, Qutbuddin
• Application Number:
  US15/060,255
• Publication Number:
  US 20160197751A1
• Time in Patent Office: 586 Days
• Field of Search: 375295, 375269, 375277, 375286, 375268, 375276
• CPC Class Codes: H04L 2027/0051 Harmonic tracking
• CPC Class Codes: H04L 2027/0055 single phase
• CPC Class Codes: H04L 2027/0067 Phase error detectors
• CPC Class Codes: H04L 27/02 Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation H04L27/32 takes precedence
• CPC Class Codes: H04L 27/10 Frequency-modulated carrier systems, i.e. using frequency-shift keying H04L27/32 takes precedence
• CPC Class Codes: H04L 27/122 using digital generation of carrier signals digital function generators G06F1/02, H04L17/10; generating pulses having stepped portions using digital techniques H03K4/026
• CPC Class Codes: H04L 27/14 Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 27/30 wherein each code element is represented by a combination of frequencies
• CPC Class Codes: H04L 27/32 Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
• CPC Class Codes: H04L 7/0331 with a digital phase-locked loop [PLL] processing binary samples, e.g. add/subtract logic for correction of receiver clock H04L7/0337 takes precedence

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.

Claims

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.

2. The method of claim 1, wherein the modulation level is represented by respective positions of inflection points between adjacent quarter-cycle waveforms.

3. The method of claim 1, wherein the look-up-table stores data that correlates input signal values to respective quarter-cycle waveforms such that each input signal value is represented by a position of an inflection point between adjacent quarter-cycle waveforms.

4. The method of claim 1, wherein the output signal has the same frequency as the carrier signal.

5. The method of claim 1, further comprising mixing the output signal with a second harmonic signal of the carrier signal to frequency-shift a third harmonic component of the output signal to a fundamental frequency of carrier signal.

6. The method of claim 1, wherein the look-up-table stores data that correlates the respective values of the input signal to respective quarter-cycle waveforms such that each of the respective input signal value is represented by a first position of a first inflection point between a first pair of adjacent quarter-cycle waveforms and a second, complementary position of a second inflection point between a second pair of adjacent quarter-cycle waveforms.

7. A method for generating a modulated signal, the method 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.

8. A system comprising:

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.

9. The system of claim 8, wherein the modulation level is represented by respective positions of inflection points between adjacent quarter-cycle waveforms.

10. The system of claim 8, wherein the look-up-table stores data that correlates the respective values of the input signal to respective quarter-cycle waveforms such that each of the respective input signal value is represented by a position of an inflection point between adjacent quarter-cycle waveforms.

11. The system of claim 8, wherein the output signal has a same frequency as the carrier signal.

12. The system of claim 8, wherein the operations further comprise mixing the output signal with a second harmonic signal of a carrier signal to frequency-shift a third harmonic component of the output signal to a fundamental frequency of carrier signal.

13. The system of claim 8, wherein the look-up-table stores data that correlates the respective values of the input signal to respective quarter-cycle waveforms such that each of the respective input signal value is represented by a first position of a first inflection point between a first pair of adjacent quarter-cycle waveforms and a second, complementary position of a second inflection point between a second pair of adjacent quarter-cycle waveforms.

14. A system comprising:

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.