Combined Error Value Transmission for Crosstalk Cancellation
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Solution Overview
Problem
In multi-carrier signal communication, especially in DSL systems, efficient error reporting is needed to minimize bandwidth usage while effectively adapting crosstalk cancellation parameters, particularly when adding new communication connections to a vectored group or changing crosstalk characteristics.
Innovation Solution
An apparatus comprising a receiver, transmitter, and error processor that evaluates individual error values for each signal carrier, calculates a combined error value, and transmits it on a backchannel, allowing for efficient adaptation of crosstalk reduction parameters by quantizing individual error values coarsely and transmitting combined error values with higher precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual error values for each signal carrier are transmitted on the backchannel, then crosstalk cancellation parameters can be effectively adapted, but bandwidth requirements increase
Solution Approach 1:
The patent extracts only the essential error information needed for crosstalk cancellation by computing a combined error value from individual carrier error values. Instead of transmitting all individual error values, the system extracts a representative combined value that captures the essential adaptation information while significantly reducing the amount of data transmitted on the backchannel.
Solution Approach 2:
The patent inverts the traditional approach by first computing individual error values for each signal carrier, then combining them into a single aggregated error value for transmission. Rather than transmitting raw individual values and processing them at the other end, the system performs the combination operation first, then transmits the condensed result, achieving bandwidth efficiency while maintaining adaptation capability.
2Reliability
If training is performed to determine crosstalk influence when adding communication connections, then crosstalk cancellation improves, but transmission time increases
Solution Approach 1:
The patent implements preliminary action by performing error value combination computations during the training phase before normal data transmission begins. The combined error values are pre-computed and made available for immediate use in crosstalk cancellation parameter adaptation, avoiding the need for extended training periods during operational transmission.
Data Source
AI summary
In a communication device, a multi-carrier signal with at least one group of signal carriers is received from a communication connection. For each of the signal carriers, at least one individual error value is evaluated or generated. From the individual error values, a combined error value is evaluated or generated. The combined error value is transmitted on a backchannel of the communication connection.