Composite Signal Generation by Auxiliary Segment Replacement
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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 high bandwidth demands.
Innovation Solution
Generation of 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 efficient data transmission 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 large spectral resources required
Solution Approach 1:
The patent combines a modulated signal with an auxiliary signal to create a composite signal. The auxiliary signal is designed to be imperceptible to conventional receivers but carries additional data information, effectively merging two data streams into one transmitted signal without requiring additional spectral bandwidth.
Solution Approach 2:
The auxiliary signal is nested within the modulated signal structure. The auxiliary signal is inserted at specific intervals (e.g., every Nth symbol period) within the existing modulation framework, allowing hidden data to be carried within the envelope of the conventional signal without expanding its spectral footprint.
2Area of stationary object
If bandwidth compression techniques are applied to reduce occupied bandwidth, then spectral efficiency is improved, but signal distortion and information loss occur
Solution Approach 1:
The auxiliary signal acts as an intermediary carrier that allows information to be transmitted without altering the primary modulated signal. By inserting the auxiliary signal as a separate component at intervals, the system avoids compressing or distorting the original signal while still achieving efficient bandwidth utilization through the combined signal structure.
3Area of stationary object
If signal shaping techniques are used to modify waveform and reduce spectral bandwidth, then required bandwidth is reduced, but complexity and computational intensity increase
Solution Approach 1:
The patent segments the data transmission into discrete intervals where the auxiliary signal is inserted at specific Nth symbol periods. This segmentation approach allows simple signal generation without complex continuous waveform manipulation, reducing computational complexity while achieving bandwidth efficiency through the periodic insertion pattern.
Data Source
AI summary
A system and method for generating a composite signal includes generating first in-phase (I) digital modulated signal data and first quadrature phase (Q) digital modulated signal data using first digital input data and generating second digital modulated signal data using second digital input data. A sinusoidal portion of one of the first I digital modulated signal data and the first Q modulated signal data corresponding to a period of a sine wave is detected and replaced with the second digital modulated signal data. An analog composite signal is generated using the second digital modulated signal data and portions of the first I digital modulated signal data and the first Q digital modulated signal data other than the sinusoidal portion.