G.Fast Vectoring Precoding Optimization

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Solution Overview

Problem

In multi-user transmission over communication lines experiencing inter-line interference, predicting data rates is challenging due to unpredictable crosstalk, leading to performance issues and difficulties in providing guaranteed minimum data rates, especially when some subscribers underutilize resources while others require high data rates.

Innovation Solution

A device and method that optimize transmission precoding parameters based on relative weights and signal-to-noise ratios (SNR) for vectored transmission, allowing flexible allocation of resources to prioritize high-demand subscribers and adjust data rates dynamically to meet performance requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If equal resource allocation is used for all subscribers, then fairness is maintained, but data rate predictability and service quality degradation are compromised when crosstalk is unpredictable

Engineering Contradiction:

Improvedata rate predictabilityVSAvoidresource allocation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic resource allocation by continuously monitoring SNR values and crosstalk conditions, then adjusting precoding parameters and power distribution in real-time. This allows the system to adapt to changing channel conditions and provide predictable data rates while managing complexity through automated control loops.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes key parameters including precoding weights, power distribution across subscribers, and modulation schemes based on measured SNR and crosstalk conditions. By dynamically adjusting these parameters, the system achieves better data rate predictability without requiring complex manual intervention.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If additional compensation signals are transmitted to cancel crosstalk, then interference mitigation is improved, but transmission resources and power consumption increase

Engineering Contradiction:

Improvecrosstalk cancellation effectivenessVSAvoidtransmission power consumption

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The patent converts the harmful crosstalk effect into a useful signal by using the interfering signals from other subscribers as additional information for channel estimation and precoding. Instead of simply canceling interference, the system exploits it to improve overall channel knowledge and adjust transmission parameters, thereby reducing the need for additional compensation signals.

Inventive Principle:

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

Solution Approach 2:

The system performs preliminary channel estimation and SNR measurement before actual data transmission. By preparing precoding parameters and power allocation decisions in advance based on measured conditions, the system avoids the need for additional real-time compensation signals during transmission, reducing power consumption.

Inventive Principle:

Principle #10Preliminary action

3Object-affected harmful factors

If crosstalk cancellation is applied to received signals, then interference is reduced, but additional noise is introduced which degrades overall performance

Engineering Contradiction:

Improveinterference reductionVSAvoidsignal quality

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent introduces an intermediary processing stage that separates the desired signal from interference and noise before final decoding. By using SNR-based thresholding and selective precoding, the system acts as a mediator that filters out only the harmful components while preserving the original signal quality, avoiding the noise amplification problem of traditional cancellation methods.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Productivity

If resources are allocated equally to all subscribers, then fairness is maintained, but high data rates cannot be provided to subscribers with low crosstalk when resources are underutilized by others

Engineering Contradiction:

Improvedata rate throughputVSAvoidflexibility in resource allocation

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality optimization by tailoring transmission parameters individually for each subscriber based on their specific channel conditions and requirements. Instead of uniform treatment, the system adjusts precoding weights and power allocation locally for each user, enabling high data rates for subscribers with favorable conditions while maintaining fairness through SNR-based prioritization.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11218187B2Fast adaptation of vectoring in G.Fast

Publication Date: 2022.01.04 MAXLINEAR INC

AI summary

A device comprises a memory configured to store, for each one of a plurality of communication lines, an associated relative weight and an associated noise value indicative of a signal-to-noise ratio of transmission on the respective communication line. The device further comprises at least one processor configured to perform an optimization of a transmission precoding parameter for vectored transmission on the plurality of communication lines based on the relative weights and the noise values. The at least one processor is configured to effect the vectored transmission on the plurality of communication lines in accordance with the optimized transmission precoding parameter.