Precoding Subset Selection for Satellite Beam Interference
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Solution Overview
Problem
Existing multi-beam satellite communication systems face interference issues due to beams sharing the same color, which reduces data rate and is not adequately addressed by current methods aimed at optimizing the number of colors or user grouping.
Innovation Solution
A method involving the use of precoding subsets, where measurements from user terminals are used to select UTs based on angular positions to minimize interference, with time-frequency resources being dynamically allocated to reduce interference between beams of the same color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the number of colors in the satellite is increased to reduce interference between beams of the same color, then the interference level is reduced, but the datarate is reduced
Solution Approach 1:
The invention segments user terminals into different precoding subsets based on their angular positions within beam areas. Each precoding subset is associated with specific time-frequency elements, allowing the system to selectively apply precoding to reduce interference between beams of the same color while maintaining high datarate through efficient resource utilization.
Solution Approach 2:
The invention changes the parameter of precoding application by selectively applying precoding to specific precoding subsets based on angular position and time-frequency element associations. This dynamic parameter adjustment allows interference reduction only where necessary, preserving overall system datarate.
2Object-affected harmful factors
If user grouping is optimized to maximize distance between users within each group, then interference is reduced, but system complexity increases
Solution Approach 1:
The invention applies local quality by considering the angular position of each user terminal within its beam area and creating precoding subsets based on these local spatial characteristics. This localized approach reduces interference by grouping users with similar angular positions, while the systematic method of creating precoding subsets keeps complexity manageable.
Solution Approach 2:
The invention performs preliminary action by pre-defining precoding subsets based on angular positions before actual data transmission. This preliminary organization of users into subsets with similar spatial characteristics allows for simplified interference management during operation without requiring complex real-time calculations.
Data Source
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AI summary
A method of exchanging data involving at least one apparatus (APP) and user terminals, or UTs. The method comprises: - receiving measurements data from the UTs, - choosing at least one precoding subset associated to groups of antennas (GANT1, ..., GANTn) defining beam areas (BA) having a considered color, each precoding subset comprising at most one UT from each of the considered beam areas, each precoding subset being chosen by selecting one or more UT each located in a different beam area among the considered beam areas as a function of at least respective angular positions of the UTs within the corresponding beam area and determined based on the measurements data, - generating at least one signal constructed as a function of the data destined to the UTs of the precoding subset or coming from the UTs of the precoding subset to transfer said data to the UTs or receive said data from the UTs using the groups of antennas associated to said at least one precoding subset.