Adaptive Power Control for Localized Wireless Subnet Self-Interference
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Solution Overview
Problem
As the demand for simultaneous multiple access in wireless communication networks increases, network contention leads to self-interference, degrading overall network performance, particularly in localized subnetworks like fighter-to-fighter communications where multiple users transmit in the same timeslot.
Innovation Solution
Each participant in a localized subnetwork determines and adjusts its transmit power based on link margins calculated for other members, reducing self-interference by setting a safe broadcasting power level at least 6 dB above the lowest link margin, thereby maintaining reliable intercommunication while minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple users transmit simultaneously in the same timeslot to increase network capacity, then simultaneous multiple access capability is improved, but self-interference increases and degrades network performance
Solution Approach 1:
The patent dynamically changes the transmit power parameter for different subnets based on their geographic location and interference characteristics. By adjusting power levels rather than using fixed power transmission, the system enables more users to access simultaneously while controlling self-interference through adaptive power management.
Solution Approach 2:
The patent implements location-aware power control where transmit power is determined based on the geographic positions of transmitters and receivers. Different regions of the network use different power levels tailored to local conditions, allowing simultaneous access in different areas while minimizing interference between co-located users.
2Reliability
If transmit power is increased to maintain communication reliability, then communication reliability is improved, but self-interference increases
Solution Approach 1:
The system dynamically adjusts transmit power parameters based on real-time conditions including link margins and interference levels. This allows the system to use minimum necessary power to maintain reliability, avoiding excessive power transmission that would increase self-interference.
Solution Approach 2:
The patent implements a feedback mechanism where users report link margins and interference conditions to the network coordinator. The coordinator uses this feedback to calculate optimal power levels that maintain communication reliability while minimizing interference, creating a closed-loop control system.
3Ease of operation
If fixed power levels are used to simplify network operation, then ease of operation is improved, but network performance degrades due to increased self-interference
Solution Approach 1:
The patent implements autonomous power control where each user terminal automatically determines and adjusts its transmit power based on received signals and calculated link margins. The system performs self-configuration without requiring manual intervention, maintaining ease of operation while achieving optimal interference management through automated algorithms.
Data Source
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AI summary
A method for reducing self-interference in a wireless network, such as a Link 16 network, while maintaining simultaneous multiple access takes advantage of the physical proximity of nodes in a localized subnetwork, such as a fighter-to-fighter subnetwork in a flight wing, by actively reducing the transmit powers used for subnet messages between the nodes. Calibration messages such as Precise Participant Location and Identification (PPLI) messages are exchanged between all of the nodes of the localized subnetwork, from which each node determines the identities, transmit powers, noise levels, and SNRs of all of the other nodes. The node then determines a link margin for other nodes, and sets its transmit power to a "safe" level for the subnetwork according to the lowest link margin.