Wireless Receiver Interference Mitigation via Signature Matching

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Solution Overview

Problem

Wireless communication networks face interference from external sources due to lack of spectral harmonization, different Time Domain Duplexing schemes, and misuse of licensed frequencies, leading to signal degradation and communication disruptions.

Innovation Solution

A mitigation module that processes digital baseband signals to identify and mitigate interference by matching signature signals with received signals, calculating mitigation weights, and generating clean digital baseband signals to improve network performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If wireless receivers operate in shared spectrum without spectral harmonization, then spectrum utilization increases, but interference from external sources increases

Engineering Contradiction:

Improvespectrum utilizationVSAvoidinterference from external sources

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent uses the interfering signal itself to generate a mitigation signature by correlating received signals with expected interference patterns. The interference, rather than being merely eliminated, is actively characterized and used to create cancellation weights that suppress it, converting the harmful interference into a useful reference for mitigation.

Inventive Principle:

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

Solution Approach 2:

The patent introduces an interference mitigation module as an intermediary between the receiver and the interference source. This module processes received signals, identifies interference components through signature matching, and applies cancellation weights to remove interference before the signal reaches the main receiver, effectively mediating the interaction between desired and interfering signals.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If TDD networks use synchronized timing for uplink/downlink separation, then spectral efficiency improves, but tropospheric duct propagation causes delayed signals to interfere with adjacent cells

Engineering Contradiction:

Improvespectral efficiencyVSAvoidinterference in adjacent cells

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by treating interference mitigation differently for different spatial locations and signal types. The system identifies cell-specific interference patterns and applies location-aware cancellation weights, allowing each cell to mitigate its specific interference characteristics while maintaining the synchronized TDD structure.

Inventive Principle:

Principle #3Local quality

3Reliability

If multiple reception sources are used to improve signal reception, then signal reliability improves, but interference from multiple directions increases

Engineering Contradiction:

Improvesignal reception reliabilityVSAvoidmulti-directional interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the interference mitigation process into multiple independent correlation operations, one for each reception source. Each source's signal is processed separately to identify and cancel its specific interference components, allowing the system to handle multi-directional interference while maintaining the reliability benefits of multiple reception sources.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11424777B2Methods and systems for mitigation of interference signals for a wireless network receiver

Publication Date: 2022.08.23 UBIQAM

AI summary

There is provided a mitigation module for mitigating interference complementing a receiver of a wireless network, comprising: at least one processor executing a code for: obtaining digital baseband signals received by a plurality of reception sources, matching at least a portion of a signature signal to at least a portion of the baseband signals, the signature signal indicative of a presence of interference signals originating from at least one external interference source, calculating a plurality of mitigation weights for at least the portion of the baseband signal corresponding to the matched at least portion of the signature signal, performing an interference mitigation process on the digital baseband signals received from the plurality of reception sources using the plurality of mitigation weights to generate clean digital baseband signals, and providing the clean digital baseband signals to a receiver of the wireless network.