Sinusoidal Waveform Receiver for High Spectral Efficiency Decoding
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Solution Overview
Problem
Current data communication systems face challenges in increasing data throughput and addressing signal degradation, particularly due to transmission path delay, interference, and non-linearity, with existing modulation techniques like Amplitude Modulation, Frequency Modulation, QAM, QPSK, PSK, and APSK having inefficiencies in power usage, bandwidth, and error rates.
Innovation Solution
The method involves periodic waveform modulation by encoding input digital data at selected phase angles of a sinusoidal waveform to create a modulated sinusoidal waveform with data notches, using a digital-to-analog converter to generate an encoded analog waveform, and employing carrier stacking to achieve high spectral efficiency, where adjacent modulated sinusoidal waveforms are separated by less than 15Hz with sidebands at least 50dB below the main signal power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional modulation techniques (AM, FM, QAM, QPSK, PSK, APSK) are used to increase data throughput, then data transmission capacity is improved, but power efficiency deteriorates and bandwidth utilization becomes inefficient
Solution Approach 1:
The patent changes the fundamental parameter of waveform modulation from conventional AM/FM/QAM/PSK approaches to sinusoidal waveform modulation with carefully controlled phase and amplitude parameters. By modulating the phase of sinusoidal waveforms and controlling the amplitude to maintain constant envelope, the system achieves high data throughput while maintaining power efficiency, directly resolving the contradiction between throughput and power consumption
2Productivity
If QAM modulation is used to increase data rates, then data throughput is improved, but peak to average power ratio increases resulting in higher power requirements
Solution Approach 1:
The patent changes the modulation approach from QAM's independent I/Q amplitude modulation to sinusoidal waveform phase modulation with constant amplitude control. This parameter change maintains high data rates by encoding information in phase variations while keeping the amplitude constant, thereby eliminating the high peak-to-average power ratio problem inherent in QAM systems
Solution Approach 2:
The patent employs periodic sinusoidal waveforms as the carrier signal and applies periodic modulation patterns that maintain constant envelope. The periodic nature of the sinusoidal waveform combined with controlled amplitude ensures that power consumption remains stable and efficient, avoiding the power fluctuations and high peak power requirements of QAM modulation
3Productivity
If modulated signals are spaced closely to improve spectral efficiency, then bandwidth utilization is improved, but signal interference increases
Solution Approach 1:
The patent changes the signal characteristics by using sinusoidal waveforms with constant amplitude and controlled phase variations. This parameter change creates signals with well-defined spectral properties that can be closely spaced in frequency without causing significant interference, as the constant envelope and sinusoidal nature provide inherent spectral containment
Solution Approach 2:
The patent introduces frequency spacing of at least 15 Hz as an intermediary parameter between closely spaced modulated signals. This minimum spacing acts as a protective buffer that prevents spectral overlap and interference while still allowing high spectral efficiency, effectively mediating between the desire for close spacing and the need to avoid interference
Data Source
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AI summary
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.