SBV DSLAM Frequency Block Allocation for FEXT Suppression
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Solution Overview
Problem
Current VDSL systems face limitations in achieving high bandwidth and efficient interference suppression in copper networks, particularly due to far-end cross-talk, and existing solutions like Multi-Operator Vectoring are centralized and inflexible, limiting data-rate and fairness in data access among operators.
Innovation Solution
The method involves frequency division multiplexing of the transmission band into blocks allocated to separate operators, applying vectoring techniques for interference suppression, ensuring fairness and flexibility by allowing sub-carrier sharing and decentralized management, which enhances data-rate and supports independent migration strategies for operators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If bandwidth is increased in current VDSL systems, then transmission capacity is improved, but interference from far-end cross-talk worsens and data-rate performance deteriorates
Solution Approach 1:
The transmission frequency band is divided into multiple non-overlapping frequency blocks, each allocated to different operators. This segmentation isolates the interference sources, allowing vectoring techniques to be applied independently within each block, thereby managing far-end cross-talk more effectively while maintaining increased bandwidth capacity.
2Object-affected harmful factors
If centralized Multi-Operator Vectoring is implemented, then interference suppression is improved, but system complexity and rigidity increase, limiting flexibility
Solution Approach 1:
The system is segmented into decentralized vectoring processing units, each operating independently on assigned frequency blocks. This reduces centralized complexity while maintaining interference suppression capability through distributed processing, allowing each operator to manage their own vectoring parameters without centralized coordination overhead.
Solution Approach 2:
The frequency block allocation and sub-carrier sharing arrangements are made dynamic, allowing operators to adapt their vectoring strategies independently. This flexibility enables the system to respond to changing interference conditions and traffic demands without rigid centralized control, reducing system complexity while maintaining effectiveness.
3Adaptability or versatility
If frequency blocks are allocated to separate operators, then operator independence is improved, but data-rate performance deteriorates due to limited spectrum availability
Solution Approach 1:
While frequency blocks are separated for operator independence, sub-carriers within and across blocks can be shared between operators through coordinated vectoring. This merging of resource utilization allows operators to achieve higher data-rates by accessing spectrum beyond their primary allocation, maintaining independence while improving overall productivity.
Solution Approach 2:
The vectoring system is designed with universal capabilities that can operate across different frequency blocks and serve multiple operators simultaneously. This multi-functionality allows the same infrastructure to support independent operator operations while enabling spectrum sharing mechanisms that enhance data-rate performance for all users.
4Object-affected harmful factors
If vectoring techniques are applied to non-overlapping frequency blocks, then interference cancellation is improved, but system complexity increases
Solution Approach 1:
Vectoring processing is segmented and distributed across multiple independent units, each handling specific frequency blocks. This segmentation reduces the computational complexity of any single processing unit compared to a centralized approach handling the entire spectrum, while collectively achieving effective interference cancellation across all blocks through parallel processing.
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 significantly improves data-rate and fairness in copper networks by enabling efficient interference cancellation and dynamic sub-carrier allocation, allowing operators to maintain independence and flexibility in their UBB migration strategies without compromising user data privacy.
Implementation Method 1
frequency division multiplexing of the transmission band into blocks allocated to separate operators
Implementation Method 2
Ideally, vectoring suppresses FEXT through the pre-compensation of disturbances in the downstream (DS) connection toward the customer and their cancellation in the opposite upstream (US) direction
Data Source
Figure 1a~1e
Figure 1f~1h
Figure 2
AI summary
The invention relates to a method for improved performance for access multiplexing on networks with metallic pairs comprising the steps of: - dividing ultra-broadband transmission frequencies into non- overlapping frequency blocks containing sub-carriers; - allocating said frequency blocks to separate operators; - applying interference suppression techniques to said frequency blocks. The invention also relates to a system adapted to implement this method, by means of at least one SBV DSLAM apparatus comprising: - a FEXT pre-coder provided with means adapted to determine FEXT for downstream transmissions; - a FEXT canceller provided with means adapted to determine FEXT reduction for upstream transmissions; - an SBV control unit, associated with said FEXT pre-coder and canceller, - an I/O interface, comprising means adapted to allow the connection of a plurality of SBV DSLAM apparatuses to one another, wherein said elements cooperate to determine the division of transmission frequencies into frequency blocks, non-overlapping and containing sub-carriers, allocated to separate operators and individually subject to interference suppression techniques, so as to allow the implementation of ultra-broadband transmissions by several operators co- located on the same cable of metallic pairs, not coordinated and not synchronized with one another.