Customer-Tuned FM Notch Filtering for G.fast Interference

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Solution Overview

Problem

The G.fast digital subscriber line protocol standard causes interference with frequency modulation radio broadcast bands due to spectral overlap, affecting broadband service quality and customer experience.

Innovation Solution

Implementing notch filters tailored to specific customer profiles to selectively avoid frequencies used by local radio stations, minimizing interference while maintaining broadband service integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If G.fast broadband service uses the full overlapping spectrum, then broadband service bandwidth is maximized, but interference with FM radio broadcast band increases

Engineering Contradiction:

Improvebroadband service bandwidthVSAvoidinterference with FM radio broadcast

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The spectrum is segmented by applying notch filters to specific frequency bands within the G.fast broadband service spectrum that overlap with FM radio broadcast frequencies. This divides the continuous spectrum into usable bands and excluded bands (notches), allowing broadband service to operate on most frequencies while avoiding interference with radio broadcasts on specific targeted frequencies.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different quality characteristics are applied to different parts of the spectrum. Most of the spectrum maintains full bandwidth for high-speed broadband service, while specific local frequency regions (where FM radio stations operate) have notch filters applied to eliminate interference. This localized filtering approach preserves overall broadband performance while protecting specific frequency bands from harmful interference.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If notch filters are applied to prevent FM radio interference, then radio broadcast quality is improved, but broadband service bandwidth is reduced

Engineering Contradiction:

ImproveFM radio broadcast interferenceVSAvoidbroadband service bandwidth

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

Instead of applying notch filters across the entire overlapping spectrum (excessive action), the system applies filters only to specific frequency bands where FM radio stations are detected (partial action). This selective approach removes just enough spectrum to protect radio broadcasts while minimizing the impact on broadband service bandwidth, achieving the necessary interference protection without unnecessary bandwidth loss.

Inventive Principle:

Principle #16Partial or excessive action

3Object-affected harmful factors

If customized profiles with notch filters are implemented, then customer-specific interference is reduced, but system complexity increases

Engineering Contradiction:

Improvecustomer-specific radio interferenceVSAvoidcustomized profile management system

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The system automatically performs spectrum analysis, detects local FM radio station frequencies, and generates customized notch filter profiles for each customer without requiring manual configuration. The system self-adjusts the notch filter settings based on detected radio frequencies and customer broadband service requirements, reducing the perceived complexity for users while maintaining customized interference protection.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system uses feedback from spectrum monitoring and service level agreement compliance to dynamically adjust notch filter configurations. By continuously monitoring both radio broadcast frequencies and broadband service performance, the system can optimize the notch filter settings to maintain both interference protection and service quality, managing complexity through automated feedback loops rather than static complex configurations.

Inventive Principle:

Principle #23Feedback

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Reduces interference on the FM radio broadcast band with minimal impact on broadband service bandwidth, ensuring reliable service and improved customer experience by dynamically adjusting notch filters based on customer listening habits and radio station frequencies.

Implementation Method 1

applying a notch filter to a target frequency of the frequency modulation radio broadcast band based on a profile that is customized for the customer

Methodology Applied

Scientific EffectNotch filtering: Filter (electronic)

Data Source

PatentUS10491253B2Reducing interference in radio broadcast bands

Publication Date: 2019.11.26 AT&T INTELLECTUAL PROPERTY I L P

AI summary

In one example, the present disclosure describes a device, computer-readable medium, and method for reducing interference on the frequency modulation (FM) radio broadcast band from the G.fast protocol standard spectrum. For instance, in one example, a method includes delivering broadband service to a customer over a spectrum that overlaps with a frequency modulation radio broadcast band, and applying a notch filter to a target frequency of the frequency modulation radio broadcast band based on a profile that is customized for the customer, wherein the notch filter prevents the broadband service from using the target frequency during the delivering.