Multi-Gateway Satellite Precoding Feedback Controller
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Solution Overview
Problem
Multi-beam satellite communication systems face challenges with high error rates and low signal-to-noise ratios due to multi-user interference and inter-feeder link interference, which current precoding methods struggle to mitigate effectively.
Innovation Solution
A multi-gateway multi-beam satellite communication system with an adaptive precoding controller that compares actual and desired signal-to-interference-plus-noise ratios (SINR) and adjusts precoding matrices to minimize intercluster interference, using both ground-based and onboard precoding methods to optimize signal power and reduce path losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If distributed hybrid ground-space precoding is used to reduce feeder link bandwidth requirements, then bandwidth efficiency is improved, but signal-to-noise ratio deteriorates due to large path losses
Solution Approach 1:
The patent implements feedback mechanisms where user terminals report channel state information and signal quality metrics back to the network. This enables the precoding controller to adaptively adjust precoding matrices based on actual channel conditions, optimizing the balance between bandwidth efficiency and signal-to-noise ratio by selecting appropriate precoding strategies according to real-time feedback data
Solution Approach 2:
The system dynamically changes precoding parameters including precoding matrix indicators (PMI), rank indicators (RI), and transmission power levels based on channel conditions. By adjusting these parameters adaptively, the system optimizes bandwidth utilization while maintaining adequate signal-to-noise ratio, resolving the contradiction between bandwidth efficiency and signal quality
2Productivity
If multiple beams are deployed to accommodate increased demand for higher throughput, then productivity is improved, but multi-user interference increases
Solution Approach 1:
The patent divides the coverage area into multiple spatial beams, each serving different user groups with dedicated time-frequency resources. By segmenting the service area and applying beamforming techniques, the system achieves higher throughput through spatial multiplexing while reducing multi-user interference through directional isolation between beams
Solution Approach 2:
The system dynamically adjusts beamforming weights and precoding matrices based on real-time channel conditions and user distribution. This dynamic adaptation allows the system to optimize spectral efficiency and reduce interference between users in different beams, maintaining high throughput while managing multi-user interference effectively
3Speed
If directive antennas are used by ground users within each beam, then signal directionality is improved, but inter-feeder link interference occurs due to pointing errors and hardware calibration errors
Solution Approach 1:
The patent implements feedback mechanisms where user terminals report channel state information and signal quality metrics back to the network. This enables the precoding controller to adaptively adjust precoding matrices based on actual channel conditions, optimizing the balance between bandwidth efficiency and signal-to-noise ratio by selecting appropriate precoding strategies according to real-time feedback data
Solution Approach 2:
The system dynamically changes precoding parameters including precoding matrix indicators (PMI), rank indicators (RI), and transmission power levels based on channel conditions. By adjusting these parameters adaptively, the system optimizes bandwidth utilization while maintaining adequate signal-to-noise ratio, resolving the contradiction between bandwidth efficiency and signal quality
Data Source
AI summary
A multi-gateway multi-beam satellite communication system. The system has a satellite a plurality of gateways for providing broadband services to users and being in bilateral communication with the satellite by a like plurality of feeder links and a second plurality of clusters of coverage areas in bilateral communication with the satellite by a like plurality of service links. The system has a precoder for allocating power to either or both of the feeder links and service links. Precoding can be based on signal to noise plus interference ratio or interference temperature. Precoding can be based on discrete-time dynamical feedback system frameworks with real-time feedback signaling comprised of signal-to-noise plus interference ratio, signal-to-leakage-plus-noise ratio, interference temperatures and/or tracking errors.