Adaptive Harmonic Cancellation Circuit for Real-Time Signal Extraction
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Solution Overview
Problem
Communication systems face degradation due to harmonics of interference signals, which are often at or near the frequency of the target signal, preventing effective reception of the target signal.
Innovation Solution
An adaptive harmonic cancellation circuit that generates a reference harmonic of the interference signal, predicts its radiated harmonic, and subtracts it from the input signal to isolate the target signal, eliminating the need for feedback loops or phase locked loops, thus reducing hardware resource consumption and enabling real-time signal extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback loops or phase locked loops are used to cancel harmonics, then harmonic cancellation can be achieved, but hardware resource consumption increases and stabilization time is required
Solution Approach 1:
The patent extracts and removes the harmful harmonic components from the input signal by generating predicted harmonics and subtracting them, eliminating the need for complex feedback loops or phase locked loops while achieving effective harmonic cancellation
Solution Approach 2:
The system performs preliminary generation of predicted harmonics based on reference harmonics before the actual signal processing, allowing real-time cancellation without requiring stabilization time from feedback mechanisms
2Reliability
If feedback loops are used for harmonic cancellation, then harmonic removal can be achieved, but stabilization time is required which delays real-time signal extraction
Solution Approach 1:
The system generates predicted harmonics in advance using reference harmonics and adaptive filtering, eliminating the need for stabilization time associated with feedback loops while maintaining effective harmonic cancellation
Solution Approach 2:
The patent creates predicted harmonics as copies of reference harmonics, modified to match the actual radiated harmonics in the input signal, enabling real-time cancellation without feedback stabilization delays
3Reliability
If complex harmonic cancellation methods are used, then better harmonic removal can be achieved, but hardware resources are consumed
Solution Approach 1:
The patent extracts only the necessary predicted harmonic components from the reference harmonics and subtracts them from the input signal, avoiding the need for energy-intensive feedback loops or phase locked loops while maintaining effective harmonic cancellation
Solution Approach 2:
The system changes parameters of the reference harmonics (amplitude, phase, frequency) to generate predicted harmonics that match the radiated harmonics, achieving effective cancellation with lower hardware resource consumption compared to complex feedback methods
Data Source
AI summary
Disclosed systems and methods relate to an adaptive harmonic cancellation circuit for communication. The adaptive harmonic cancellation circuit includes a harmonic generator circuit configured to generate a reference harmonic of an interference signal. The adaptive harmonic cancellation circuit includes a harmonic prediction circuit coupled to the harmonic generator circuit. The harmonic prediction circuit is configured to receive an input signal including a target signal at a frequency and a radiated harmonic of the interference signal. The harmonic prediction circuit is configured to generate a predicted harmonic of the interference signal by modifying the reference harmonic of the interference signal to match the radiated harmonic of the interference signal in the input signal. The adaptive harmonic cancellation circuit includes a cancellation circuit coupled to the harmonic prediction circuit. The cancellation circuit is configured to obtain the target signal at the frequency by subtracting the predicted harmonic from the input signal.