RF Variable Filter Control for Cognitive Radio Interference Avoidance
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Solution Overview
Problem
Cognitive radio systems face challenges in efficiently sharing frequency bands with existing radio systems due to high interference levels, as existing solutions like Detect and Avoid (DAA) are specialized for ultra-wideband systems and difficult to implement in general cognitive radio systems, leading to suboptimal interference suppression and increased power consumption.
Innovation Solution
The use of charge-domain variable filter circuits in RF processing stages for both transmission and reception, allowing dynamic control of frequency characteristics and notch filtering to minimize interference between primary and secondary systems, thereby enabling effective frequency sharing with reduced power consumption and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Detect and Avoid (DAA) is applied to cognitive radio systems, then interference suppression is improved, but the system complexity increases and power consumption increases
Solution Approach 1:
The patent extracts the essential function of DAA (interference detection and avoidance) and implements it through a simplified architecture using charge-domain variable filter circuits. Instead of implementing the full complex DAA system, the invention extracts only the necessary interference suppression capability and integrates it into the RF processing stage through variable filter circuits that can dynamically adjust frequency characteristics and add notch filters when interference is detected.
Solution Approach 2:
The patent replaces the traditional mechanical/DAA-based interference avoidance mechanism with an electronic solution using charge-domain variable filter circuits. These circuits electronically adjust frequency responses and add notch filters in the charge domain, substituting the complex mechanical/DAA system with a more efficient electronic implementation that achieves similar interference suppression with reduced complexity.
2Object-affected harmful factors
If Detect and Avoid (DAA) is applied to cognitive radio systems, then interference suppression is improved, but power consumption increases
Solution Approach 1:
The patent extracts only the essential interference suppression function from the full DAA system and implements it through energy-efficient charge-domain variable filter circuits. By taking out only the necessary functionality (frequency characteristic adjustment and notch filter addition) and implementing it in the charge domain, the system achieves effective interference suppression with significantly reduced power consumption compared to traditional DAA approaches.
Solution Approach 2:
The patent substitutes the power-intensive mechanical/DAA-based interference avoidance with an electronic implementation using charge-domain variable filter circuits. These circuits operate more efficiently by directly manipulating charge domains rather than through the complex signal processing required by traditional DAA, thereby reducing power consumption while maintaining interference suppression effectiveness.
3Reliability
If frequency checking is performed periodically in cognitive radio communication, then frequency availability is ensured, but the ratio of check time to communication time increases
Solution Approach 1:
The patent applies dynamics by making the frequency checking mechanism adaptive rather than static. The system dynamically adjusts the frequency checking frequency and intensity based on the current radio environment and communication needs. When the environment is stable, checking is reduced; when changes are detected, checking is intensified. This dynamic approach ensures frequency availability while minimizing unnecessary check time.
Solution Approach 2:
The patent changes the parameter of frequency checking from a fixed periodic interval to an adaptive mechanism that adjusts checking intensity based on system state. By changing the checking parameter dynamically according to communication conditions and detected interference levels, the system maintains reliable frequency availability while reducing the overall check time ratio compared to fixed periodic checking.
Data Source
AI summary
A communication apparatus includes a radio-frequency transmission-reception processing unit configured to perform radio-frequency processing to a transmitted signal and a received signal; a baseband processing unit configured to perform baseband processing; a signal detecting unit configured to detect a signal from which a signal transmitted from another communication system is detected; and an interference-to-another-communication-system avoiding unit configured to suppress an interfering signal to the other communication system in radio-frequency transmission processing by the radio-frequency transmission-reception processing unit if the signal detecting unit detects a signal.