HAPS Multi-Feeder Link Weight Precalculation for Antenna Switching
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Solution Overview
Problem
The interference reduction performance between feeder links in a communication system with rotating and moving antennas deteriorates due to changes in antenna combinations.
Innovation Solution
A system that calculates and stores weights to suppress interference between feeder links, selects the appropriate weight for changed antenna combinations, and adjusts directional beams to maintain interference suppression during antenna rotation or movement, using time-synchronized gateway stations and MIMO interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If weights are calculated dynamically for each antenna combination pattern, then interference reduction performance is improved, but processing delay increases and productivity deteriorates
Solution Approach 1:
The patent pre-calculates and stores weights for multiple antenna combination patterns before actual communication operations. When antenna combinations change due to rotation or movement, the system simply selects from pre-computed weights rather than recalculating, thereby eliminating processing delay while maintaining interference reduction performance
Solution Approach 2:
The system predicts future antenna combination patterns based on current rotation and movement states, and pre-calculates weights for these predicted patterns in advance. This ensures that when pattern changes occur, appropriate weights are already available, preventing any interruption in interference suppression
2Adaptability or versatility
If antenna combinations are changed to track gateway stations, then communication adaptability is improved, but interference reduction performance deteriorates due to weight calculation delays
Solution Approach 1:
The system pre-calculates weights for multiple possible antenna combination patterns that may occur during tracking operations. When the HAPS rotates or moves and antenna combinations change, the system immediately selects from pre-computed weights corresponding to the new pattern, ensuring continuous interference reduction without performance degradation
Solution Approach 2:
The system dynamically selects appropriate pre-calculated weights based on real-time antenna combination patterns. By having multiple pre-computed weight sets ready for different patterns, the system can rapidly adapt to changing antenna configurations while maintaining optimal interference suppression performance
Data Source
AI summary
It is to mitigate a deterioration of an interference reduction performance between multi-feeder links due to a weight-calculation processing delay, when a combination of plural antennas for feeder link (FL antenna) incorporated in an aerial-staying type communication relay apparatus and plural gateway (GW) stations changes. With respect to each of plural combination patterns in which combinations of plural FL antennas of relay communication station and the plural GW stations are different from each other, a system calculates and stores a weight corresponding to each of the plural GW stations, selects a calculation result of the weight of the combination pattern corresponding to the changed combination, when the combination of the plural FL antennas and the plural GW stations changes due to at least one of a rotation and movement of the communication relay apparatus, and suppresses an interference between the feeder links when transmitting and receiving signals between the relay communication station and the plural GW stations based on the selected calculation result of the weight of the combination pattern.