Carrier Signal Extraction for Suppressed-Carrier Modulated Signals
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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
1Quantity of substance
If carrier suppression is used in modulated signals, then bandwidth efficiency is improved, but the ability to extract and manage carrier signals deteriorates
Solution Approach 1:
The patent introduces an intermediary carrier signal generation process that creates a reference carrier from the modulated signal itself. This intermediary carrier serves as a mediator between the suppressed carrier and the demodulation process, enabling extraction without requiring the original carrier to be present in the transmitted signal.
Solution Approach 2:
The system creates a copy of the carrier signal by generating a reference carrier that replicates the characteristics of the original suppressed carrier. This copied carrier is then used for demodulation purposes, allowing the system to function as if the original carrier were still present.
2Quantity of substance
If multiple modulation types are combined on a single carrier, then bandwidth utilization is improved, but signal separation and management becomes more complex
Solution Approach 1:
The patent segments the combined modulated signal into separate components through individual demodulation processes. Each modulation type (AM, FM, PM) is handled by its own dedicated demodulator, dividing the complex separation task into manageable segments that can be processed independently.
Solution Approach 2:
The system employs a universal carrier extraction mechanism that can serve multiple modulation types simultaneously. The same carrier signal generation and extraction process works for AM, FM, and PM signals, providing a multi-functional solution that reduces overall system complexity despite handling multiple modulation types.
Data Source
AI summary
Methods, systems, and apparatus for detecting a center frequency of an input signal, the input signal including a carrier signal modulated with a modulation signal. Detecting a frequency of a second signal. Determining a difference signal between the center frequency of the input signal and the frequency of the second signal. Modifying the frequency of the second signal based on the difference signal to provide the carrier signal. And, outputting the carrier signal.