Composite Signal Generation with Zero-Crossing Waveform Interleaving
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Solution Overview
Problem
Existing modulation techniques such as QAM and QPSK are limited by spectral inefficiency, requiring large spectral resources to achieve high data rates, which strains wireless and telecommunications systems under increasing bandwidth demands.
Innovation Solution
A method and apparatus generate a multi-component signal comprising a modulated signal and an auxiliary zero-crossing modulated waveform, where the auxiliary waveform is embedded within the modulated signal, allowing for high spectral efficiency without significant signal degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If QAM and QPSK modulation techniques are used to achieve high data rates, then data transmission rate is improved, but spectral efficiency deteriorates due to requiring large spectral resources
Solution Approach 1:
The patent combines a modulated signal with an auxiliary zero-crossing modulated waveform into a composite signal. The auxiliary waveform is generated by modulating a carrier signal with a message signal such that zero-crossings occur at specific intervals, and this auxiliary signal is merged with the original modulated signal to create a composite signal that achieves higher spectral efficiency while maintaining data transmission rate
Solution Approach 2:
The auxiliary zero-crossing modulated waveform is embedded within the modulated signal structure. The message signal is nested within the auxiliary waveform, which itself is integrated with the modulated signal, creating a hierarchical signal structure that allows multiple layers of information to coexist efficiently in the spectral domain
2Quantity of substance
If bandwidth compression techniques are applied to reduce occupied bandwidth, then spectral bandwidth is reduced, but signal distortion and information loss occur
Solution Approach 1:
The patent applies preliminary action by pre-modulating the message signal onto the auxiliary carrier waveform before integrating it with the modulated signal. This preliminary modulation ensures that the message information is encoded in a way that is compatible with the existing modulated signal structure, allowing bandwidth reduction without causing distortion or information loss during the compression process
3Quantity of substance
If signal shaping techniques are used to modify waveform to reduce spectral bandwidth, then required bandwidth is reduced, but complexity and computational intensity increase
Solution Approach 1:
The patent changes the parameter of the carrier signal by introducing a zero-crossing modulation scheme where the phase or frequency of the carrier is varied to encode the message signal. This parameter change allows the signal to achieve reduced spectral bandwidth through simple zero-crossing detection and reconstruction, avoiding complex waveform shaping operations while maintaining low computational complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enhances spectral efficiency by allowing high-speed data transmission with minimal bandwidth requirements, maintaining signal quality and enabling covert data conveyance.
Implementation Method 1
generating, based upon the input digital data, zero-crossing modulated waveform data. The zero-crossing modulated waveform data encodes the input digital data and represents an auxiliary zero-crossing modulated waveform
Implementation Method 2
mixing the zero-crossing modulated waveform data and FM data representing the FM signal wherein the mixing produces the multi-component signal
Data Source
AI summary
A system and method for composite signal generation which includes receiving input digital data and producing, using the input digital data, a stream of waveform data defining an auxiliary zero-crossing-modulated waveform. The method includes generating a modulation timing signal. A composite signal having a frequency determined by the modulation timing signal is generated. Generation of the composite signal includes inserting periods of the auxiliary zero-crossing-modulated waveform into the composite signal so that one or more periods of the auxiliary zero-crossing modulated waveform are interposed between periods of the modulated signal.