Transpositional modulation
AssigneeTM IP Holdings, LLC
InventorsHarvey C. Woodsum, Richard C. Gerdes
Life of this patent
Estimating the term…
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.
Claims21
(canceled)
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:
- receive a combined signal comprising a carrier signal modulated with both a transpositional modulation (TM) signal and a non-TM signal, and
- determine average values of a combined signal over respective symbol frames of the non-TM signal;
- a non-TM signal demodulator coupled to the frame-averaged signal estimator and configured to demodulate the non-TM signal based on the average values of the combined 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;
- and
- a TM signal demodulator coupled to the TM signal separator and configured to demodulate the TM signal.
Dependencies are inferred from the claim text.