Single and multiple sinewave modulation and demodulation...

Details Single and multiple sinewave modulation and demodulation... Single and multiple sinewave modulation and demodulation...

2007-12-18

2007-12-18

Lugo, David B. (Department: 2611)

Pulse or digital communications

Transmitters

Amplitude modulation

C375S268000

Reexamination Certificate

active

11383457

ABSTRACT:
A method for generating a substantially sinusoidal waveform containing encoded digital data having one of a first value and a second value at selected phase angles θncomprises generating the waveform having an amplitude Y defined by a first function at phase angles lying outside of data regions, the first function being Y=sin θ; generating the waveform having an amplitude Y defined by the first function at phase angles lying inside the data regions having a range of Δθ beginning at each phase angle θnwhere data of the first value is to be encoded; and generating the waveform having an amplitude Y defined by a second function different from Y=sin θ at phase angles lying inside the data regions having a range of Δθ associated with each phase angle θnwhere data of the second value is to be encoded. The third harmonic of the waveform may be generated and used.

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Harlod R. Walker, “Understanding Ultra Narrowband Modulation”, Microwaves and RF, Dec. 2003, pp. 53-54, 56, 58, 60-61.

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