Satellite Relay Interference Cancellation via Ground Station Segmentation
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Solution Overview
Problem
Satellite telecommunications systems face challenges in increasing capacity due to intra-system interference in multi-spot geographic coverage systems with N-color reuse schemes, where existing solutions either reduce capacity or require complex and impractical information transfers between ground stations.
Innovation Solution
Implementing a method where each ground station transmits all information intended for a specific color or sub-color to a relay device, allowing for intra-system interference cancellation without the need for communication links between ground stations, and dividing colors into sub-colors to ensure partial coverage even in case of unavailability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-spot geographic coverage systems with N-color reuse schemes are used to increase capacity, then system capacity increases, but intra-system interference increases
Solution Approach 1:
The patent segments the frequency spectrum into N distinct colors and divides geographic coverage into multiple spots, where each color is assigned to specific spots in a reuse pattern. This segmentation allows capacity increase through frequency reuse while managing interference through spatial and spectral separation.
Solution Approach 2:
The patent applies local quality by optimizing the directivity of antenna patterns for each spot, tailoring the radiation characteristics to specific geographic areas. This reduces co-frequency interference from adjacent spots while maintaining signal strength in the intended coverage area.
2Object-generated harmful factors
If interference cancellation algorithms are implemented, then intra-system interference is reduced, but complex information transfers between ground stations are required
Solution Approach 1:
The patent enables each ground station to independently implement interference cancellation by providing it with the necessary interfering signal information through the relay device. Each ground station serves itself by processing and canceling interference without requiring direct communication links with other ground stations, thus simplifying the overall infrastructure.
3Reliability
If colors are divided into sub-colors, then service coverage is maintained during ground station unavailability, but system complexity increases
Solution Approach 1:
The patent further segments each color into multiple sub-colors, allowing the information stream for a given color to be distributed across multiple ground stations. If one ground station becomes unavailable, its sub-colors can be reassigned or the service continues with reduced capacity, ensuring reliability while maintaining a manageable system structure.
Data Source
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AI summary
There is proposed a method of telecommunication in a system with multi-spot geographical coverage comprising an outbound pathway for transmitting information, via a relay device of satellite or aircraft type (1), from a plurality of terrestrial stations (GW1 to GW4) to a plurality of terminals located in spots. Each downlink of the outbound pathway is associated with a colour (C1, d d to C4, d) in a reuse scheme with N colours, N>2. For at least one colour (or sub-colour), one of the terrestrial stations transmits to the relay device all the information intended to be transmitted by the relay device with this colour (or sub-colour).