Transpositional modulation
AssigneeTM IP Holdings, LLC
InventorsHarvey C. Woodsum, Richard C. Gerdes
Life of this patent
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Abstract
Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for modulating and demodulating transpositional modulated (TM) signals. One aspect features a method of modulating a carrier signal that include the actions of generating a TM signal by generating a sinusoidal signal, and modulating the sinusoidal signal based on a data signal to provide the TM signal. Inserting the TM signal into a carrier signal to provide a TM modulated carrier signal. Modulating the TM modulated carrier signal with a non-TM signal to provide a combined signal. Transmitting the combined signal.
Claims24
A method of demodulating a carrier signal, the method comprising:
- receiving a combined signal comprising a carrier signal modulated with both a transpositional modulation (TM) signal and a non-TM signal;
- determining average values of the combined signal over respective symbol frames of the non-TM signal;
- demodulating the non-TM signal based on the average values of the combined signal;
- removing the non-TM signal from the combined signal;
- and
- demodulating the TM signal.
A method of demodulating a carrier signal, the method comprising:
- receiving a modulated carrier signal comprising a carrier signal modulated with a transpositional modulation (TM) signal;
- determining an average phase of the modulated carrier signal over a symbol period of the modulation signal;
- generating a reference signal based on the average phase of the carrier signal;
- extracting the TM signal from the carrier signal by determining a time varying phase difference between the modulated carrier signal and the reference signal, the time varying phase difference representing the TM signal;
- and
- demodulating the TM signal by identifying discrete phase shifts between the modulation signal and the reference signal.
A receiver comprising:
- a frame-averaged signal estimator configured to determine average values of a combined signal over respective symbol frames of a non-TM signal, the combined signal comprising a carrier signal modulated with both a transpositional modulation (TM) signal and the non-TM signal;
- a non-TM signal demodulator coupled to the frame-averaged signal estimator and configured to demodulate the non-TM signal;
- a TM signal separator coupled to the frame averaged-signal estimator and configured to separate the TM signal from the non-TM signal of the combined signal based on recovered symbol values of the non-TM signal;
- and
- a TM signal demodulator coupled to the TM signal separator and configured to demodulate the TM signal.
A receiver 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 combined signal comprising a carrier signal modulated with both a transpositional modulation (TM) signal and a non-TM signal;
- determining average values of the combined signal over respective symbol frames of the non-TM signal;
- demodulating the non-TM signal based on the average values of the combined signal;
- removing the non-TM signal from the combined signal;
- and
- demodulating the TM signal.
Dependencies are inferred from the claim text.