VDSL2 Data Processing Using Symmetrical Transfer Matrix for Crosstalk Reduction

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Solution Overview

Problem

VDSL2-based communication systems face significant limitations due to crosstalk interference, which degrades data signals and restricts maximum data rates, especially as transmission speeds increase, necessitating a method to reduce alien noise and self-FEXT in twisted-pair lines.

Innovation Solution

A method and device that utilize a symmetrical transfer matrix to process data, where off-diagonal elements are determined by their symmetric and transposed counterparts and corresponding diagonal elements, allowing for efficient noise cancellation and precoding to reduce computational efforts and alien noise, specifically addressing crosstalk effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If transmission speed is increased to achieve higher data rates, then data transmission performance is improved, but crosstalk interference deteriorates and limits maximum data rate

Engineering Contradiction:

Improvedata rateVSAvoidcrosstalk interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by performing precompensation for crosstalk interference before data transmission. The system estimates crosstalk coefficients and precalculates compensation signals that are added to the transmitted signal, thereby counteracting the harmful crosstalk effects before they degrade the received signal quality. This allows higher data rates to be achieved without being limited by crosstalk interference.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the harmful crosstalk interference into a beneficial effect by using the same crosstalk mechanisms to cancel themselves out. The system estimates the crosstalk coefficients from the transmitted signals and uses these estimates to generate compensation signals that, when added to the original signals, cause the crosstalk components to cancel each other out, transforming the harmful interference into a self-cancelling effect that enables higher data rates.

Inventive Principle:

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

2Ease of manufacture

If conventional data processing methods are used, then implementation is simple, but computational power required for noise cancellation is excessive

Engineering Contradiction:

Improveimplementation simplicityVSAvoidcomputational power

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The patent applies segmentation by dividing the data processing into separate upstream and downstream directions. The transfer matrix is decomposed into independent upstream and downstream components, allowing noise cancellation to be performed separately for each direction. This segmentation reduces the overall computational complexity compared to processing the complete matrix, as each directional component can be processed independently with fewer operations required.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by focusing computational resources only on the essential noise cancellation operations rather than processing the complete transfer matrix. The system calculates only the necessary upstream and downstream components required for effective noise cancellation, avoiding unnecessary computations. This partial processing approach significantly reduces computational power requirements while maintaining effective noise cancellation performance.

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If aggressive Power Spectral Density masks are used to increase data rate, then bandwidth utilization is improved, but NEXT interference increases

Engineering Contradiction:

Improvedata rateVSAvoidNEXT interference

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent applies preliminary action by precompensating for NEXT interference before transmission. The system estimates the NEXT coefficients and precalculates compensation signals that are added to the transmitted signal, thereby counteracting the harmful NEXT effects before they interfere with the received signal. This allows aggressive PSD masks to be used to achieve higher data rates without being limited by increased NEXT interference.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8666059B2Method and device for processing data and to a communication system comprising such device

Publication Date: 2014.03.04 RPX CORP

AI summary

A method and a device process data transmitted via a channel. The channel is at least partially represented by a symmetrical transfer matrix, wherein at least one off-diagonal matrix element of the transfer matrix is determined by its symmetric and/or transposed off-diagonal matrix element and its corresponding diagonal matrix elements of the transfer matrix. In addition, a communication system is provided containing such a device.