Carrier Signal Separation for TM Extraction From Combined Modulation
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Solution Overview
Problem
Existing carrier modulation techniques face challenges in extracting and managing carrier signals from modulated signals, especially when the carrier is suppressed or when little a priori information about the modulated signal is available, limiting the ability to combine different modulation types on a single carrier frequency and increasing bandwidth efficiently.
Innovation Solution
The method involves detecting the center frequency of an input signal, generating a difference signal with a signal generator, and modifying the frequency of a second signal to extract and modulate the carrier signal with a transpositional modulation (TM) signal, allowing for the combination and separation of TM signals from traditional modulation schemes without interfering with existing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional modulation techniques are used to transmit information, then signal transmission is achieved, but the ability to extract and manage carrier signals is limited when the carrier is suppressed or when little a priori information is available
Solution Approach 1:
The patent applies preliminary action by pre-processing the modulated signal through frequency detection and center frequency identification before carrier extraction. The system detects the center frequency of the modulated signal and uses this information to guide the carrier recovery process, enabling reliable extraction even when the carrier is suppressed or minimal a priori information is available.
Solution Approach 2:
The patent implements feedback mechanisms where the detected center frequency and signal characteristics are continuously monitored and used to adjust the carrier extraction process. This feedback loop enables the system to adapt to varying signal conditions and maintain reliable carrier signal extraction despite carrier suppression or limited information availability.
2Productivity
If multiple modulation types are combined on a single carrier frequency, then bandwidth efficiency is improved, but signal separation and management become more difficult
Solution Approach 1:
The patent applies segmentation by separating different modulation types into distinct processing paths. The system identifies and extracts each modulation type (traditional modulation and transpositional modulation) as separate components from the combined signal, allowing independent processing and management of each modulation scheme while maintaining bandwidth efficiency.
Solution Approach 2:
The patent uses an intermediary approach by introducing a carrier extraction and regeneration stage that acts as a mediator between the combined modulated signal and the separation process. The extracted carrier serves as a reference for demodulating and separating different modulation types, simplifying the overall signal management while maintaining high bandwidth efficiency.
3Productivity
If carrier signals are suppressed in modulated signals, then transmission efficiency is improved, but the ability to extract and manage carrier signals deteriorates
Solution Approach 1:
The patent applies preliminary action by detecting the center frequency and signal characteristics before attempting carrier extraction. This pre-processing step provides crucial information about the suppressed carrier's original frequency and properties, enabling reliable carrier recovery even when the carrier was suppressed during transmission to improve efficiency.
Solution Approach 2:
The patent implements feedback by continuously monitoring the extracted carrier signal and comparing it with the detected center frequency. This feedback mechanism allows the system to adjust and refine the carrier extraction process, ensuring reliable carrier recovery despite the carrier having been suppressed in the transmitted signal.
Data Source
AI summary
Methods, systems, and apparatus for receiving an input signal, where the input signal includes a carrier signal modulated with a first modulation signal and a second modulation signal, and where the second modulation signal is a TM signal. Demodulating the first modulation signal from the input signal. Modulating an unmodulated carrier signal with the first modulation signal to generate a third signal, where the third signal includes the carrier signal modulated by the first modulation signal. And, removing the first modulation signal from the input signal by subtracting the third signal from the input signal to extract the TM signal from the input signal.