Vectored Data Transmission Crosstalk Reduction
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Solution Overview
Problem
In large DSL systems, determining crosstalk coupling between communication connections within a vectored group is computationally complex and time-consuming, especially when adding a new connection, requiring long sequences and numerous calculation operations.
Innovation Solution
The use of modified pilot signals, such as Walsh-Hadamard sequences, and intermediate FEXT vectors to reduce the computational complexity by estimating crosstalk coupling coefficients through orthogonal sequences and error signals, allowing for efficient adaptation of crosstalk reduction coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If long training sequences are used to determine crosstalk coupling coefficients in large DSL systems, then measurement precision is improved, but loss of time increases and productivity decreases
Solution Approach 1:
The patent segments the determination of crosstalk coupling coefficients by using intermediate FEXT vectors that represent different groups of communication connections. Instead of processing all connections simultaneously with a single long training sequence, the system divides the vectored group into subsets, determines intermediate coupling coefficients for each subset, and then combines these intermediate results to obtain the final crosstalk coupling coefficients. This segmentation allows using shorter training sequences while maintaining determination accuracy.
2Measurement precision
If conventional methods are used to determine crosstalk coupling coefficients, then measurement precision is maintained, but device complexity and computational complexity increase
Solution Approach 1:
The patent reduces computational complexity by segmenting the crosstalk coupling determination into multiple stages. First, intermediate FEXT vectors are determined for subsets of communication connections using shorter training sequences. Then, these intermediate vectors are combined through mathematical operations to obtain the final crosstalk coupling coefficients. This segmented approach significantly reduces the number of calculation operations compared to conventional methods that process all connections simultaneously.
Solution Approach 2:
The patent performs preliminary determination of intermediate FEXT vectors for subsets of communication connections before combining them to obtain the final crosstalk coupling coefficients. These intermediate results are prepared in advance and stored, then used in subsequent combination steps. This preliminary action reduces the overall computational burden by breaking down the complex determination process into manageable preliminary stages.
Data Source
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AI summary
In some embodiments, sequences of pilot signals on different communication channels of a communication connection are shifted with respect to each other. In other embodiments, crosstalk couplings are calculated based on intermediate vectors.