Communication Device Interference Correction Satellite Spots
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Solution Overview
Problem
Current communication systems face interference issues between neighboring but not directly adjacent satellite transmission spots sharing the same frequency band, leading to signal degradation for mobile terminals as they move between coverage areas.
Innovation Solution
A method and device that calculate and generate corrective signals to reduce interference by using reference data and antenna patterns to combine useful signals with corrective signals, minimizing the signal-to-noise ratio at the edge of affected spots without modifying existing satellite or terminal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency bands are reused in neighboring spots to optimize bandwidth, then spectral efficiency is improved, but interference between spots increases
Solution Approach 1:
The gateway applies preliminary anti-action by calculating and subtracting an estimated interference signal from the received composite signal before the terminal processes it. The gateway uses knowledge of the interfering spot's transmission parameters (power, antenna pattern, propagation conditions) to pre-estimate the interference and remove it, preventing the interference from degrading the useful signal reception.
Solution Approach 2:
The gateway acts as an intermediary between the satellite and the terminal by receiving the composite signal containing both useful and interfering components, processing it through interference estimation and subtraction, and delivering a cleaned signal to the terminal. This intermediary processing resolves the interference issue without requiring changes to the satellite or terminal.
2Reliability
If transmission power is increased to improve signal quality at spot edges, then signal-to-noise ratio is improved, but interference in neighboring spots increases
Solution Approach 1:
The system implements feedback by having the gateway estimate the interference signal based on the transmitted signal characteristics and propagation conditions, then subtract this estimate from the received signal. This closed-loop approach continuously adapts to changing conditions and removes interference without requiring increased transmission power, thus maintaining signal quality while reducing harmful effects on neighboring spots.
Solution Approach 2:
The invention changes the parameter of signal processing by introducing interference estimation and subtraction in the received signal domain rather than simply adjusting transmission power. This parameter change allows the system to maintain high signal-to-noise ratio at spot edges while preventing interference propagation to neighboring spots through mathematical signal processing.
3Measurement precision
If antenna beams are directed precisely to cover specific spots, then coverage precision is improved, but signal leakage to neighboring spots increases
Solution Approach 1:
The gateway applies the extraction principle by separating the useful signal from the interfering signal in the received composite signal. Through interference estimation based on antenna patterns and propagation conditions, the system extracts and removes the interfering component, keeping only the useful signal for further processing. This extraction resolves the signal leakage issue without compromising coverage precision.
Data Source
Figure 1~7
Figure 3A~3B
Figure 4A~4B
AI summary
A communication device (1) intended to transmit a plurality of useful signals to a satellite (SAT) from a transmitter (Em), each of the useful signals transmitted by the device (1) being intended to be addressed to a given transmission spot (C1, CV, CN), said device (1) comprising a set of reference values (ENSr) of power (PR(POSk)) and phase (ΦR(POSk)) of at least one first reference signal (SR) received at different points (POSk) of at least one transmission spot, a first useful signal (S11) being capable of generating an interfering signal (S1v) in a neighboring spot (Cv), the transmitter (Em) generating at least one useful neighbor signal (Svv) in a neighboring spot (Cv) of the first spot (C1), the transmitter (Em) generating a first corrective signal (Svvc1) from the first transmitted signal (S11) and at least one first phase value (ΦR) and a first power value (PR) of a set of reference values (ENSr),said transmitter (Em) emitting a combination of the correction signal (SVVC1) and the neighbor signal (Svv) in order to generate a corrected neighbor signal (Svv').