Sine Wave Phase-Amplitude-Time Modulation for Low-Noise Data Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing data transmission methods using sine wave modulation suffer from significant noise and modulation byproducts, limiting data transmission rates and requiring excess bandwidth.
Innovation Solution
Phase-amplitude-time modulation techniques, which involve generating a sine wave at phase 0, restricting transmissions from peak and zero crossing phases, and distorting the sine wave through amplitude-time modulation to encode digital information, allowing for increased data transmission rates and improved noise immunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct amplitude modulation of sine waves is used, then data transmission is achieved, but significant noise and modulation byproducts are produced that limit signal range and quality
Solution Approach 1:
The modulation process is segmented into distinct phases: selecting specific phase angles for modulation, applying amplitude modulation only during non-restricted phases, and avoiding modulation at peak and zero-crossing phases. This segmentation reduces harmful harmonics and sidebands while maintaining data transmission capability.
Solution Approach 2:
Different modulation strategies are applied to different portions of the sine wave cycle. Amplitude modulation is applied selectively during non-restricted phases (when the sine wave is in its linear region) while avoiding peak and zero-crossing phases. This local differentiation reduces distortion and harmful byproducts.
2Productivity
If hybrid modulation schemes (QAM, SM, SSB) are used, then improved data transmission is achieved, but significant noise and modulation byproducts still reduce actual transmission rates
Solution Approach 1:
The modulation scheme dynamically adjusts the modulation depth and phase selection based on the instantaneous phase of the carrier wave. By continuously monitoring the phase angle and adapting modulation parameters accordingly (avoiding peak/zero-crossing regions), the system achieves better noise immunity while maintaining high transmission rates.
Solution Approach 2:
The invention changes the modulation parameters dynamically - specifically, the amplitude modulation index is adjusted based on the phase angle of the carrier wave. Modulation is applied only when the phase angle falls within non-restricted ranges, effectively changing the modulation parameters in real-time to minimize noise and byproducts.
3Quantity of substance
If modulation is applied at all phases of the sine wave, then maximum data encoding capacity is achieved, but harmonics, side bands, and electromagnetic interference are generated
Solution Approach 1:
The invention extracts and removes the harmful portions of the modulation process by identifying and excluding peak phases and zero-crossing phases from amplitude modulation. By taking out these problematic phases from the modulation process, harmonics, side bands, and electromagnetic interference are significantly reduced while retaining sufficient data encoding capacity.
Solution Approach 2:
The system takes preliminary action by pre-identifying restricted phases (peak and zero-crossing regions) before modulation occurs. By anticipating which phases will generate harmful byproducts and proactively avoiding modulation during those phases, the invention prevents the generation of harmonics, side bands, and electromagnetic interference rather than attempting to filter them afterward.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A method for generating a compound signal wave with one or more substantially sinusoidal waveform(s) containing an encoded digital information combined with a variable phase changing waveform(s) producing a compound notched sinusoid waveform including at least an amplitude-time modulated sine wave and at least one phase modulated wave(s). Presence or absence of change to a wave's sinusoidal amplitude within a phase indicates a data value. These data values can be changed within a data cycle or packet. Reduced modulation distortion is exhibited by amplitude-time modulation techniques when compared to classical amplitude modulation techniques. This reduced distortion in a communications signal results in increased effective transmission lengths, reduced error rates, higher data rates, and improved data security.