Satellite Receiver Subcarrier Erasure for Narrowband Interference

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Solution Overview

Problem

Satellite receivers experience severe performance degradation due to narrowband interference from terrestrial signals, which can be strong and occupy a small fraction of the satellite signal bandwidth, leading to throughput reduction.

Innovation Solution

Implementing a system that uses Orthogonal Frequency Division Multiplexing (OFDM)-like signaling with interference erasure, including interpolation and decimation filtering, and adaptive coding and modulation to mitigate interference, while maintaining minimal changes to the satellite transmitter and receiver.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If satellite receivers operate in areas with terrestrial communication systems using the same radio frequency spectrum, then the receivers can access communication services, but they experience severe performance degradation due to narrowband interference

Engineering Contradiction:

Improvereceiver operation in interference environmentsVSAvoidreceiver performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The receiver divides the received signal into multiple subcarriers through Fourier transform, allowing individual identification and erasure of interference-affected subcarriers while preserving clean subcarriers for data reconstruction

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The receiver extracts and removes the harmful interference by identifying subcarriers with abnormal power levels and erasing their corresponding signal components, then reconstructs the original signal using only the clean subcarriers

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If the receiver moves to a location with negligible interference or switches to a frequency without interference, then receiver performance is maintained, but service availability and convenience are reduced

Engineering Contradiction:

Improvereceiver performanceVSAvoidreceiver deployment flexibility

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The receiver autonomously detects interference-affected subcarriers by analyzing power levels, automatically erases the corrupted signal components, and reconstructs the original signal without requiring user intervention or system coordination

Inventive Principle:

Principle #25Self-service

3Device complexity

If the technique introduces minimal changes to the normal satellite transmitter and receiver, then implementation complexity is reduced, but interference mitigation capability must be maintained

Engineering Contradiction:

Improvetransmitter and receiver modificationsVSAvoidnarrowband interference

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The receiver performs preliminary Fourier transform on the received signal to identify interference-affected subcarriers before signal reconstruction, enabling proactive interference removal without requiring complex transmitter modifications

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3529918B1Satellite transmission including narrowband interference erasure

Publication Date: 2026.04.29 HUGHES NETWORK SYST

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AI summary

A receiver, transmitter and system are programmed to communicate based on a signal including a plurality of signal components associated respectively with a plurality of subcarriers over a communications channel. The receiver is programmed to determine, from the plurality of subcarriers, a subcarrier subject to interference and erase the signal component associated with the subcarrier subject to interference. The receiver is further programmed to reconstruct the signal based on the plurality of first signal components excluding the erased first signal component.