Cable Bundle Interference Offset via Quasi-Signal Injection

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Solution Overview

Problem

Cable bundles in access networks experience significant interference, particularly crosstalk, which affects the speed and quality of high-speed internet services, such as giga-level Internet services provided through FTTx systems, leading to a need for methods to control and decrease interference.

Innovation Solution

A device and method that includes a plurality of concentration devices and an interference measurer to measure interference signals, calculate an interference coefficient, and generate a quasi-interference signal to offset interference, which is then added to the original signal and transmitted through the cable bundle, effectively reducing interference between concentration devices and terminals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple concentration devices transmit signals through a shared cable bundle to serve multiple terminals, then network service coverage and subscriber capacity are improved, but interference (crosstalk) between signals increases

Engineering Contradiction:

Improvenetwork service coverageVSAvoidinterference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary anti-action by calculating and transmitting quasi-interference signals that are phase-inverted (180 degrees opposite) to the original interference signals. The interference measurer measures the actual interference, calculates an interference coefficient, and generates quasi-interference signals that pre-counteract the harmful interference before it degrades the signal quality at the terminal.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent converts the harmful interference into a beneficial effect by using the measured interference signal to generate a quasi-interference signal. The interference coefficient derived from the harmful interference is used to create an offset signal that, when added to the original signal, transforms the harmful interference into a useful cancellation mechanism, improving signal quality.

Inventive Principle:

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

2Reliability

If interference offset signals are added to original signals to reduce crosstalk, then signal quality and service speed are improved, but device complexity increases

Engineering Contradiction:

Improvesignal qualityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces an interference measurer as an intermediary component that measures the interference signal and calculates the interference coefficient. This intermediary device facilitates the generation of quasi-interference signals without requiring complex modifications to the existing concentration devices, thereby improving signal quality while managing device complexity through a dedicated measurement and calculation module.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements feedback by having the interference measurer continuously measure the interference signal and transmit the interference coefficient back to the concentration devices. This feedback loop enables dynamic adjustment of the quasi-interference signals based on actual interference conditions, ensuring optimal signal quality while maintaining manageable device complexity through automated adaptation.

Inventive Principle:

Principle #23Feedback

3Object-affected harmful factors

If phase-inverted offset signals are transmitted through the cable bundle, then interference cancellation effectiveness is improved, but signal processing complexity increases

Engineering Contradiction:

Improveinterference cancellationVSAvoidsignal processing complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by modifying the phase parameter of the offset signal to be 180 degrees inverted relative to the original interference signal. This specific phase inversion parameter simplifies the signal processing complexity while maintaining effective interference cancellation, as it requires only a fixed phase shift rather than complex adaptive filtering algorithms.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9960807B2Device for decreasing interference in cable bundle and method thereof

Publication Date: 2018.05.01 KT CORP

AI summary

Disclosed is a device and method for decreasing interference in a cable bundle. The device includes a plurality of concentration devices, an interference measurer, and a concentration device. Each concentration device accesses an uplink and provides a network service to a terminal through a cable bundle in an access section. An interference measurer is connected between the cable bundle and the terminal. The interference measure is configured to measure an interference signal by measuring a signal transmitted to the terminal through the cable bundle, calculate an interference coefficient for generating a quasi-interference signal, and transmit the same to the concentration devices. The concentration devices is configured to calculate an additional signal for offsetting an interference signal by using the interference coefficient, add the additional signal to the original signal, and transmit the additional signal to the cable bundle.