SATCOM Link Interference Mitigation via Cognitive Radio Adaptation
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Solution Overview
Problem
Satellite communications (SATCOM) systems face challenges in maintaining reliable and efficient operations in Radio Frequency Interference (RFI) environments, requiring effective anti-jamming capabilities to ensure continuous and robust performance, especially in wideband geosynchronous orbit (GEO) SATCOM networks that experience both unintentional and intentional interferences.
Innovation Solution
The implementation of a cognitive radio testbed apparatus with dynamic spectrum management and adaptive configurations, including frequency hopping, beamforming, forward error correction, and game reasoning processes to optimize system parameters such as transmission power, data rate, and modulation schemes, while employing interference nulling and multiple antenna configurations to mitigate RFI effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping and beamforming are applied to mitigate RFI, then anti-jamming capability is improved, but device complexity increases
Solution Approach 1:
The patent segments the SATCOM system into multiple functional modules including frequency hopping module, beamforming module, interference nulling module, and game reasoning module. Each module handles specific aspects of RFI mitigation independently, allowing the complex anti-jamming functionality to be divided into manageable components that can be implemented and maintained separately.
Solution Approach 2:
The system dynamically adjusts transmission parameters including frequency hopping patterns, beamforming weights, and modulation schemes based on real-time RFI conditions detected by the cognitive radio testbed. This dynamic adaptation allows the system to respond to changing interference environments without requiring complete system redesign.
2Reliability
If adaptive configurations are implemented to counter RFI, then communication reliability is improved, but system complexity increases
Solution Approach 1:
The cognitive radio testbed implements continuous feedback loops that monitor RFI conditions, evaluate system performance, and automatically adjust transmission parameters. The game reasoning process analyzes interference patterns and provides feedback for optimizing frequency hopping sequences, beamforming configurations, and error correction schemes in real-time.
Solution Approach 2:
The system changes multiple transmission parameters simultaneously including frequency offsets, power levels, modulation schemes, and coding rates to adapt to RFI conditions. These parameter changes are coordinated through the game reasoning process to maintain optimal communication performance under varying interference scenarios.
3Object-affected harmful factors
If interference nulling and multiple antenna configurations are used, then RFI mitigation is improved, but device complexity increases
Solution Approach 1:
The patent introduces interference nulling as an intermediary processing stage between signal reception and demodulation. Multiple antenna configurations serve as intermediaries that spatially separate desired signals from interfering signals, allowing the system to mitigate RFI without directly modifying the core communication protocols.
Data Source
AI summary
A systematic interferences mitigation design for protected satellite communications (SATCOM) is provided. An advanced channel coding is designed to provide coding gain for SATCOM even in the presence of synchronization errors because of unintentional and intentional radio frequency interferences (RFIs). A unified SATCOM system spectrum efficiency and energy efficiency performance model is developed with a unified interference model for SATCOM dynamic resource allocation (DRA). The SATCOM system DRA is designed with a game theoretic engine and link optimizations providing traffic control, power control, frequency hopping pattern selection, beamforming codebook selection, and modulation with coding agile waveform adaptations. The interferences mitigation design is implemented with software defined radio USRP and GNU-radio to maintain communication link quality of services (QoS).