Multi-Beam Satellite Antenna Sub-Band Beam Allocation for Low Interference
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Solution Overview
Problem
Existing methods for allocating frequency resources in multi-beam antennas face challenges in maximizing bit rate while minimizing co-channel interference, particularly due to frequency dispersion and spatial constraints of user distribution, leading to suboptimal spectral efficiency and complex processing.
Innovation Solution
The method involves decomposing the frequency band into sub-bands, forming stable orthogonal beams within each sub-band, and allocating these beams to user terminals such that local maxima of gain are positioned at local minima of adjacent beams, ensuring minimal interference and maximizing beam coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency resources are allocated to users based on spatial separation to minimize interference, then spectral efficiency is improved, but user coverage area is reduced
Solution Approach 1:
The frequency band is segmented into multiple sub-bands, and the coverage area is divided into zones associated with different beam grids. Users in different zones can access the same frequency sub-band through different beams, effectively segmenting the interference problem spatially and frequency-wise, allowing broader coverage while maintaining spectral efficiency.
Solution Approach 2:
The patent introduces an additional dimension of beam grid orientation angles to the traditional frequency-user mapping. By varying the orientation angles of beam grids across different frequency sub-bands, the system creates a multi-dimensional resource allocation space that decouples the trade-off between spectral efficiency and coverage area.
2Reliability
If beamforming weightings are reconfigured to minimize interference between users, then spectral efficiency is improved, but device complexity is increased
Solution Approach 1:
Beam grids with optimized weightings are pre-calculated and stored for different frequency sub-bands and orientation angles. During operation, the system simply selects and applies pre-computed beamforming weightings rather than performing real-time optimization, significantly reducing processing complexity while maintaining spectral efficiency.
Solution Approach 2:
The patent transforms the complex continuous beamforming optimization problem into a discrete parameter selection problem by defining specific beam grid orientations and weightings for different frequency sub-bands. This parameterization approach simplifies the control complexity while achieving interference minimization.
3Stability of the object's composition
If frequency band is divided into sub-bands to stabilize beam patterns, then beam stability is improved, but frequency resource utilization is reduced
Solution Approach 1:
The frequency band is divided into sub-bands to stabilize beam patterns within each sub-band. However, through frequency reuse across different beam grids and zones, the same frequency sub-band resources are utilized multiple times across different spatial regions, compensating for the segmentation overhead and improving overall frequency resource utilization.
Solution Approach 2:
Each frequency sub-band is designed to be universally usable across multiple beam grids and coverage zones through proper weighting and orientation selection. This multi-functionality allows the same frequency resources to serve multiple purposes and users simultaneously, maximizing resource utilization despite frequency band segmentation.
Data Source
AI summary
A method for allocating resources in an active multi-beam antenna satellite telecommunications system operating in a given frequency band and for a given coverage area wherein a plurality of user terminals is located, the method includes the steps of: decomposing the frequency band into sub-bands such that, in each sub-band, the beams formed by the antenna are stable for all of the frequencies of the sub-band, determining, for each sub-band, a grid of orthogonal beams making it possible to cover some of the coverage area, defining several subsets of user terminals and allocating, to each subset, one of the grids of orthogonal beams and a pointing direction of this grid so that each beam in the grid points towards at least one of the user terminals in the subset.