Twisted-Pair Crosstalk Cancellation Using Dynamic Coefficient Calculation
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Solution Overview
Problem
Current DSL systems face significant storage space challenges due to the need for multiple preset coefficient matrices for each device in a family, leading to increased storage requirements for crosstalk signal cancellation.
Innovation Solution
A method and apparatus for crosstalk signal cancellation in twisted-pair communications systems, where a first crosstalk coefficient is obtained based on error signals from customer-premises equipment (CPE) and used to precode signals, with an update factor representing changes in crosstalk coefficients, reducing the need for extensive storage of coefficient matrices by adjusting signals based on transmission parameters of connected CPEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple preset coefficient matrices are stored for each device in a family to enable crosstalk cancellation, then crosstalk signal cancellation accuracy is improved, but storage space requirements increase significantly
Solution Approach 1:
The patent transitions from static storage of multiple preset coefficient matrices to dynamic calculation of crosstalk coefficients in real-time. The system calculates crosstalk coefficients based on actual transmission parameters and error signals during operation, eliminating the need for extensive pre-stored matrices while maintaining cancellation accuracy.
Solution Approach 2:
The patent changes the approach from using fixed preset coefficient matrices to dynamically calculating crosstalk coefficients based on actual transmission parameters. By computing coefficients from real-time error signals and transmission conditions, the system achieves accurate crosstalk cancellation without requiring large storage spaces for multiple device-specific matrices.
2Reliability
If preset coefficient matrices are stored for each device to handle crosstalk cancellation, then signal transmission reliability is improved, but device complexity increases
Solution Approach 1:
The system performs self-calibration by calculating crosstalk coefficients based on actual error signals and transmission parameters during operation. This self-service approach eliminates the need for complex storage management of multiple preset matrices, as the system dynamically computes what it needs based on real-time conditions.
Solution Approach 2:
The patent replaces static storage management with dynamic calculation. Instead of managing multiple preset coefficient matrices for different devices, the system dynamically computes crosstalk coefficients based on actual transmission parameters and error signals, simplifying the overall system complexity while maintaining reliability.
3Reliability
If extensive coefficient matrix storage is implemented for each device, then crosstalk cancellation performance is improved, but system efficiency decreases due to storage consumption
Solution Approach 1:
The patent changes from storing extensive coefficient matrices to calculating crosstalk coefficients dynamically based on actual transmission parameters. This parameter change approach maintains high cancellation performance while significantly improving system efficiency by eliminating the storage overhead and associated processing complexity.
Solution Approach 2:
The system transitions to dynamic calculation of crosstalk coefficients during operation, based on real-time error signals and transmission conditions. This dynamic approach improves system efficiency by avoiding the storage and management overhead of extensive coefficient matrices while maintaining effective crosstalk cancellation performance.
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
This approach reduces storage space requirements by dynamically adjusting signals using crosstalk coefficients and transmission parameters, effectively canceling crosstalk signals without the need for extensive coefficient matrix storage, enhancing efficiency in DSL systems.
Implementation Method 1
According to an electromagnetic induction principle, a signal in any twisted pair in the bundle of twisted pairs is affected by electromagnetic interference generated by signals in the other twisted pairs.
Data Source
Figure 1-1
Figure 1-2~2-1
Figure 2-2
AI summary
This application discloses a crosstalk signal cancellation method and apparatus, and a system, and pertains to the communications field. The method is applied to a twisted-pair communications system, the twisted-pair communications system includes a first line and at least one second line, the first line connects a first network node and a first user node, and the at least one second line connects at least one second network node and at least one second user node. The first user node is connected to at least first CPE and second CPE. When the first CPE communicates with the first network node, a first crosstalk coefficient between the first line and the at least one second line is obtained based on an error signal fed back by the first CPE; and when the second CPE communicates with the first network node, a signal to be sent to the second CPE is precoded based on the first crosstalk coefficient between the first line and the at least one second line and a first update factor. This application can reduce consumption of storage space.