Ground Access Node Beamforming for Low-Complexity Satellite Relays
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Solution Overview
Problem
Current wireless relay communication systems, particularly satellite communication systems, face challenges in efficiently managing beamforming to maximize data transmission capacity while minimizing system complexity, weight, and power consumption, especially when covering large geographic areas.
Innovation Solution
The implementation of end-to-end beamforming systems that compute and apply beam weights within a ground network, using a central processing system to form end-to-end beams through an end-to-end relay, which includes multiple transponders and antennas to induce multipath channels, allowing for the formation of user beams and feeder beams with a single set of weights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional beamforming is implemented on satellite with extensive processing power, then beamforming capability is improved, but system complexity, weight, and power consumption increase
Solution Approach 1:
The patent extracts the beamforming processing function from the satellite and relocates it to ground-based access nodes. The satellite retains only simple signal relay functionality, while complex beamweight computation and application are performed on the ground, thereby reducing satellite complexity while maintaining beamforming capability.
Solution Approach 2:
The patent introduces access nodes as intermediary devices between the satellite and user terminals. These access nodes perform the complex beamforming computations and signal processing functions, acting as mediators that offload processing requirements from the satellite while enabling sophisticated beamforming operations.
2Adaptability or versatility
If traditional beamforming is implemented on satellite with extensive processing power, then beamforming capability is improved, but weight increases
Solution Approach 1:
The patent extracts heavy processing equipment from the satellite to ground-based access nodes. This extraction eliminates the need for weightly onboard processors, memory systems, and power supplies at the satellite, significantly reducing satellite weight while preserving beamforming functionality through ground-based computation.
3Adaptability or versatility
If traditional beamforming is implemented on satellite with extensive processing power, then beamforming capability is improved, but power consumption increases
Solution Approach 1:
The patent extracts power-intensive processing operations from the satellite to ground-based access nodes. High-power processors, memory systems, and cooling infrastructure are located on the ground where power is readily available, allowing the satellite to operate with minimal power consumption while maintaining full beamforming capability through ground-based computation.
4Productivity
If narrow beams are used to focus energy to wireless relay, then data transmission efficiency is improved, but coverage area is reduced
Solution Approach 1:
The patent implements dynamic beamforming where beam directions, widths, and shapes are continuously adjusted based on real-time channel conditions and traffic requirements. Access nodes compute time-varying beamweights to dynamically form narrow beams for high-data-rate links while simultaneously providing broader coverage areas for service continuity, adapting the beam characteristics to match instantaneous system needs.
Solution Approach 2:
The patent segments the coverage area into multiple spatial zones served by different access nodes and beam configurations. Each access node manages specific geographic regions with tailored beamforming parameters, allowing narrow beams to focus energy efficiently within designated zones while the collective system maintains comprehensive coverage through coordinated multi-node operation.
Data Source
AI summary
Methods and systems are described for providing end-to-end beamforming. For example, end-to-end beamforming systems include end-to-end relays and ground networks to provide communications to user terminals located in user beam coverage areas. The ground segment can include geographically distributed access nodes and a central processing system. Return uplink signals, transmitted from the user terminals, have multipath induced by a plurality of receive/transmit signal paths in the end to end relay and are relayed to the ground network. The ground network, using beamformers, recovers user data streams transmitted by the user terminals from return downlink signals. The ground network, using beamformers generates forward uplink signals from appropriately weighted combinations of user data streams that, after relay by the end-end-end relay, produce forward downlink signals that combine to form user beams.