Cognitive Radio Interference Management via Charge-Domain Variable Filters
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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 methods like Detect and Avoid (DAA) are specialized for ultra-wideband systems and struggle to accommodate general cognitive radio systems, leading to suboptimal interference suppression and increased power consumption.
Innovation Solution
The implementation of charge-domain variable filter circuits in both transmission and reception RF processing stages, which dynamically control frequency characteristics and notch filtering to minimize interference between primary and secondary systems, allowing for effective frequency sharing and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Detect and Avoid (DAA) methods are used for interference suppression in cognitive radio systems, then interference suppression capability is improved, but device complexity and power consumption increase due to specialization for ultra-wideband systems
Solution Approach 1:
The patent applies universality by designing a spectrum management base station that can serve multiple cognitive radio systems simultaneously. The base station implements a unified interference management approach that works across different frequency bands and system types, rather than requiring separate specialized systems for each cognitive radio application. This multi-functional design reduces overall device complexity while maintaining interference suppression capability.
Solution Approach 2:
The patent introduces an intermediary interference management base station that mediates between primary and secondary systems. This intermediary entity coordinates frequency usage, manages interference levels, and enables cognitive radio systems to share spectrum resources without requiring complex specialized DAA hardware in each cognitive radio device. The mediator approach simplifies individual device complexity while achieving effective interference suppression at the system level.
2Object-affected harmful factors
If Detect and Avoid (DAA) methods are used for interference suppression, then interference suppression capability is improved, but power consumption increases
Solution Approach 1:
The intermediary base station performs the computationally intensive interference detection and avoidance calculations centrally, rather than requiring each cognitive radio device to perform these operations independently. This centralization reduces power consumption at individual device levels while maintaining effective interference suppression capability across the entire system.
Solution Approach 2:
The interference management base station automatically monitors spectrum usage, detects interference conditions, and adjusts frequency allocations without requiring active participation or high power consumption from cognitive radio devices. The system performs self-service interference management, reducing the energy burden on individual cognitive radio terminals while maintaining suppression capability.
3Productivity
If frequency bands are shared between primary and secondary systems, then frequency resource utilization is improved, but interference levels between systems increase
Solution Approach 1:
The patent implements feedback mechanisms where the interference management base station continuously monitors interference levels between primary and secondary systems. Based on this feedback, the base station dynamically adjusts frequency allocations, power levels, and spectral masks to maintain acceptable interference thresholds while maximizing frequency resource utilization. This closed-loop control enables simultaneous achievement of high resource utilization and low interference levels.
Solution Approach 2:
The system employs dynamic frequency management where allocation decisions are not fixed but adapt in real-time based on current spectrum conditions, primary system activity, and interference measurements. This dynamic approach allows the system to maximize frequency resource utilization during periods of low primary system activity while automatically reducing secondary system transmissions when primary systems are active, thereby maintaining low interference levels.
4Productivity
If frequency bands are shared between primary and secondary systems, then frequency resource utilization is improved, but interference levels from primary system to secondary system increase
Solution Approach 1:
The feedback mechanism monitors not only interference from secondary to primary systems but also interference from primary to secondary systems. The base station uses this bidirectional feedback to make informed decisions about frequency allocation, ensuring that primary system transmissions are coordinated to minimize harmful interference to secondary cognitive radio systems while maintaining overall frequency resource utilization efficiency.
Data Source
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AI summary
A communication apparatus includes a radio-frequency transmission-reception processing unit (1-3,11,12,21,22) configured to perform radio-frequency processing to a transmitted signal and a received signal; a baseband processing unit (42,44) configured to perform baseband processing; a signal detecting unit (43) 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 (23) configured to suppress an interfering signal to the other communication system in radio-frequency transmission processing by the radio-frequency transmission-reception processing unit (1-3,11,12,21,22) if the signal detecting unit (43) detects a signal.