Orbital Base Station Interference Filtering via Sounding Signal Subtraction

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Solution Overview

Problem

Orbital base stations face significant interference from terrestrial mobile devices communicating with terrestrial base stations, which use protocols and frequencies common with orbital base stations, leading to challenges in signal demodulation and communication efficiency.

Innovation Solution

The implementation of a method where the orbital base station processes a sounding period signal to derive a sounding base signal, which is then subtracted from subsequent signaling period signals to filter out interference from terrestrial mobile devices, thereby enhancing the signal-to-noise-plus-interference ratio (SINR) and improving communication clarity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If orbital base stations use common protocols and frequencies with terrestrial base stations, then communication compatibility and spectrum utilization are improved, but interference from terrestrial mobile devices and signal demodulation reliability deteriorate

Engineering Contradiction:

Improvecommunication compatibilityVSAvoidsignal demodulation reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the received signal into desired signal components and interference components by deriving a sounding base signal that represents terrestrial interference. This segmentation allows the orbital base station to process and remove interference separately from the desired signal, resolving the contradiction between using common frequencies and maintaining signal reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent extracts the interference component from the composite received signal by using the sounding base signal to represent and subtract terrestrial mobile device interference. This extraction process isolates the harmful interference from the desired orbital communication signal, enabling reliable demodulation despite frequency overlap.

Inventive Principle:

Principle #2Taking out (Extraction)

2Productivity

If orbital base stations receive signals from both terrestrial and orbital mobile devices on the same frequency, then spectrum efficiency is improved, but signal-to-noise-plus-interference ratio deteriorates

Engineering Contradiction:

Improvespectrum efficiencyVSAvoidsignal-to-noise-plus-interference ratio

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent performs preliminary action by deriving the sounding base signal during a sounding period before the actual signaling period. This advance preparation allows the orbital base station to have an accurate representation of terrestrial interference characteristics available when processing subsequent signals, improving the SINR measurement precision without sacrificing spectrum efficiency.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by continuously updating the sounding base signal to reflect current terrestrial interference conditions. This feedback mechanism ensures that the interference representation remains accurate over time, maintaining high SINR even as terrestrial mobile device activity varies, while preserving efficient spectrum utilization.

Inventive Principle:

Principle #23Feedback

3Area of stationary object

If orbital base stations process signals in high interference environments, then communication coverage is improved, but decoding accuracy deteriorates

Engineering Contradiction:

Improvecommunication coverageVSAvoiddecoding accuracy

Core Design Contradiction:

Area of stationary objectVSManufacturing precision

Solution Approach 1:

The patent converts the harmful terrestrial interference into a beneficial component by deriving the sounding base signal from the interference itself. This sounding base signal is then used to subtract and remove the interference, transforming what was previously harmful noise into a useful tool for improving decoding accuracy while maintaining wide communication coverage.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12250063B2Orbital base station filtering of interference from terrestrial-terrestrial communications of devices that use protocols in common with orbital-terrestrial communications

Publication Date: 2025.03.11 LYNK GLOBAL INC

AI summary

An orbiting multiple access transceiver communicates with terrestrial mobile stations which are also capable of communicating with terrestrial base stations. The multiple access transceiver is configured to sample a signal when a terrestrial mobile station of interest is not transmitting to produce a sample signal. The sample signal may be processed to produce an out-of-phase signal that may be applied to a signal when the terrestrial mobile station of interest is transmitting to produce a clearer signal from the terrestrial mobile station of interest.