Receiver for high spectral efficiency data communications system using encoded sinusoidal waveforms
First Claim
1. A method of recovering input digital data encoded by amplitude perturbations at respective phase angles of a modulated sinusoidal waveform wherein cumulative power reductions associated with at least two of the amplitude perturbations are matched, the method comprising:
- receiving the modulated sinusoidal waveform;
generating digital values representing the modulated sinusoidal waveform;
subtracting a digital representation of an unmodulated sinusoidal waveform from the digital values in order to generate a received digital data sequence including perturbation values representative of the amplitude of the modulated sinusoidal waveform within the perturbations; and
estimating the input digital data based upon the perturbation values;
wherein the amplitude perturbations include first, second, third, and fourth amplitudeperturbations and wherein the respective phase angles include a first phase angle Θ
1, a second phase angle Θ
2, a third phase angle Θ
3, and a fourth phase angle Θ
4; and
wherein a first cumulative power difference between a power of the modulated sinusoidalwaveform and a power of the unmodulated sinusoidal waveform over a first phase angle range subtended by the first amplitude perturbation matches a third cumulative power differencebetween the power of the modulated sinusoidal waveform and the power of the unmodulated sinusoidal waveform over a third phase angle range subtended by the third amplitude perturbation.
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Abstract
A method of recovering information encoded by a modulated sinusoidal waveform having first, second, third and fourth data notches at respective phase angles, where a power of the modulated sinusoidal waveform is reduced relative to a power of an unmodulated sinusoidal waveform within selected ones of the first, second, third and fourth data notches so as to encode input digital data. The method includes receiving the modulated sinusoidal waveform and generating digital values representing the modulated sinusoidal waveform. A digital representation of the unmodulated sinusoidal waveform is subtracted from the digital values in order to generate a received digital data sequence, which includes digital data notch values representative of the amplitude of the modulated sinusoidal waveform within the first, second, third and fourth data notches. The input digital data is then estimated based upon the digital data notch values.
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Citations
30 Claims
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1. A method of recovering input digital data encoded by amplitude perturbations at respective phase angles of a modulated sinusoidal waveform wherein cumulative power reductions associated with at least two of the amplitude perturbations are matched, the method comprising:
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receiving the modulated sinusoidal waveform; generating digital values representing the modulated sinusoidal waveform; subtracting a digital representation of an unmodulated sinusoidal waveform from the digital values in order to generate a received digital data sequence including perturbation values representative of the amplitude of the modulated sinusoidal waveform within the perturbations; and estimating the input digital data based upon the perturbation values; wherein the amplitude perturbations include first, second, third, and fourth amplitude perturbations and wherein the respective phase angles include a first phase angle Θ
1, a second phase angle Θ
2, a third phase angle Θ
3, and a fourth phase angle Θ
4; andwherein a first cumulative power difference between a power of the modulated sinusoidal waveform and a power of the unmodulated sinusoidal waveform over a first phase angle range subtended by the first amplitude perturbation matches a third cumulative power difference between the power of the modulated sinusoidal waveform and the power of the unmodulated sinusoidal waveform over a third phase angle range subtended by the third amplitude perturbation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A system for recovering information encoded by a modulated sinusoidal waveform having first, second, third and fourth amplitude perturbations at respective phase angles Θ
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1, Θ
2, Θ
3, Θ
4 wherein a power of the modulated sinusoidal waveform is reduced relative to a power of an unmodulated sinusoidal waveform within selected ones of the first, second, third and fourth amplitude perturbations so as to encode input digital data, the system comprising;one or more analog-to-digital converters for generating digital values representing the modulated sinusoidal waveform; an input buffer for storing the digital values; a sine wave subtraction apparatus for subtracting a digital representation of the unmodulated sinusoidal waveform from the digital values in order to generate a received digital data sequence including digital amplitude perturbation values representative of the amplitude of the modulated sinusoidal waveform within the first, second, third and fourth amplitude perturbations; and a sub-periodic time domain demodulator for estimating the input digital data based upon the digital amplitude perturbation values; wherein a first cumulative power difference between a power of the modulated sinusoidal waveform and a power of the unmodulated sinusoidal waveform over a first phase angle range subtended by the first amplitude perturbation matches a third cumulative power difference between the power of the modulated sinusoidal waveform and the power of the unmodulated sinusoidal waveform over a third phase angle range subtended by the third amplitude perturbation. - View Dependent Claims (24, 25, 26)
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1, Θ
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27. A method of recovering input data represented by amplitude perturbations at a plurality of phase angles of a modulated sinusoidal waveform wherein at least two of the plurality of phase angles are separated by approximately 180 degrees, the method comprising:
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receiving the modulated sinusoidal waveform; generating data values representing the modulated sinusoidal waveform; generating a received data sequence including perturbation data values representative of the amplitude of the modulated sinusoidal waveform within the plurality of amplitude perturbations; and estimating the input data based upon the perturbation data values; wherein a first cumulative power difference between a power of the modulated sinusoidal waveform and a power of an unmodulated sinusoidal waveform over a first phase angle range subtended by a first of the amplitude perturbations matches a second cumulative power difference between the power of the modulated sinusoidal waveform and the power of the unmodulated sinusoidal waveform over a second phase angle range subtended by a second of the amplitude perturbations. - View Dependent Claims (28, 29, 30)
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Specification