Multi-Beam Satellite Frequency Allocation via Cell Splitting
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Solution Overview
Problem
Current frequency reuse techniques in multi-beam satellite radio communication systems face challenges in optimizing transmission capacity and minimizing interference, particularly with conventional schemes like four-color and two-color frequency reuse, which do not effectively balance frequency band reuse and interference insulation.
Innovation Solution
A method and system that divide a geographic service area into hexagonal or square cells, with each cell split into two parts along an axis of symmetry, allocating frequencies such that each part corresponds to a specific sub-band and polarization, reducing the total frequency band usage to three sub-bands, and ensuring contiguous cell parts have different colors, thereby maximizing interference distances and reducing the frequency band required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If four-color frequency reuse scheme is used, then frequency band reuse is improved, but interference between adjacent beams increases
Solution Approach 1:
The invention divides each cell into two distinct parts (first part and second part) along an axis of symmetry. Each part is then assigned different frequency sub-bands and polarizations. This segmentation allows for more granular control of interference patterns while maintaining frequency reuse, effectively resolving the contradiction between maximizing frequency reuse and minimizing interference.
2Device complexity
If two-color frequency reuse scheme is used, then device complexity is reduced, but interference levels increase significantly
Solution Approach 1:
The invention applies different frequency sub-bands and polarizations to different parts of the same cell (first part vs second part). This local differentiation allows the system to maintain simple overall structure while achieving better interference management through localized frequency-polarization assignments, thus reducing interference without significantly increasing complexity.
3Productivity
If fractional frequency reuse with 4 colors is used, then transmission capacity is improved, but frequency band usage increases
Solution Approach 1:
The invention combines frequency sub-band allocation with polarization assignment in a unified scheme. By merging these two dimensions of resource allocation, the system achieves higher transmission capacity through more efficient spectral utilization, while actually reducing the total frequency band requirement compared to traditional 4-color FFR schemes.
Data Source
Figure 1~3
Figure 4a
Figure 4b
AI summary
Frequency allocation method in a multibeam satellite radiocommunication system, in which: - a geographical service area covered by the system is decomposed into a plurality of cells (Cell), distributed in a first grid (G1) and a second grid (G2) of cells, the cells of the first grid (G1) and the cells of the second grid (G2) being respectively associated with inverse polarizations of the transmission signals; - a cell (Cell) is decomposed into two parts (P), one part being respectively associated with a color (1, 2, 3, 4, 5, 6) corresponding to a sub-band of frequencies and to the polarization of the grid (G1, G2) to which it belongs, the total frequency band being decomposed into three sub-bands of frequencies; and two contiguous parts of a cell of the same grid are associated with different colors.