Phase-Angle Sinusoidal Encoding for High-Spectral-Efficiency Signals

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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 15 Hz with sidebands at least 50 dB below the main signal power.

Engineering Contradictions & Design Principles

VSEngineering 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 suboptimal

Engineering Contradiction:

Improvedata throughputVSAvoidpower efficiency

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent applies periodic sinusoidal waveforms as the carrier signal for modulation. By using periodic sine waves instead of conventional carriers, the system achieves energy-efficient transmission while maintaining high data throughput. The periodic nature of the sinusoidal waveform allows for consistent energy distribution and predictable signal behavior, resolving the contradiction between throughput and power efficiency.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent changes the modulation parameters by encoding data at selected phase angles of the sinusoidal waveform rather than using conventional amplitude or frequency modulation. This parameter change enables the system to achieve both high spectral efficiency and power efficiency simultaneously, as the phase-angle-based encoding optimizes energy utilization while maintaining data transmission capacity.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If higher order modulation schemes are used to increase data rates, then data throughput is improved, but peak to average power ratio increases causing signal distortion

Engineering Contradiction:

Improvedata rateVSAvoidsignal distortion

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the modulation approach by using phase angle selection on sinusoidal waveforms instead of conventional amplitude and phase modulation. This parameter change maintains a more consistent envelope structure even at higher data rates, reducing peak-to-average power ratio and minimizing signal distortion while preserving high data transmission capacity.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If QAM modulation is used to achieve high data rates, then spectral efficiency is improved, but the number of power levels increases causing higher peak to average power ratio

Engineering Contradiction:

Improvespectral efficiencyVSAvoidpeak to average power ratio

Core Design Contradiction:

ProductivityVSPower

Solution Approach 1:

The patent changes from amplitude-based power level modulation (QAM) to phase angle-based modulation. This parameter change allows the system to achieve high spectral efficiency through multiple phase states without requiring multiple power levels, thereby maintaining a lower and more consistent peak-to-average power ratio while preserving spectral efficiency.

Inventive Principle:

Principle #35Parameter changes

4Productivity

If conventional modulation techniques are used, then data transmission is achieved, but susceptibility to noise and interference increases

Engineering Contradiction:

Improvedata transmissionVSAvoidnoise susceptibility

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent uses periodic sinusoidal waveforms with consistent amplitude and frequency characteristics, making the signal more robust against noise and interference. The regular periodic structure allows for easier synchronization and detection at the receiver, reducing susceptibility to harmful factors while maintaining data transmission capability.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS10530624B2System for encoding multi-bit features into sinusoidal waveforms at selected phase angles

Publication Date: 2020.01.07 TERAWAVE

AI summary

A system and method for encoding multi-bit features into sinusoidal waveforms at selected phase angles. The method includes receiving input digital data and encoding the input digital data in a sinusoidal waveform by modulating the sinusoidal waveform at selected phase angles within a period of the sinusoidal waveform, thereby creating a modulated sinusoidal waveform. An encoded analog waveform is generated, using a digital-to-analog converter, from a digital representation of the modulated sinusoidal waveform. The modulating includes forming a first data notch at a first phase angle of the selected phase angles wherein the first data notch includes a first plurality of transition features and subtends a first phase angle range about the first phase angle, the first plurality of transition features being representative of a first plurality of bit values included within the input digital data.