DSL Signal Processing for Vectored Power Saving
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Solution Overview
Problem
In DSL systems, the combination of Vectored DSL technology and Discontinue Mode for Power Saving (DMPS) results in reduced line SNR and communication quality, as shutting down front-end processing modules on idle subscriber lines leads to increased crosstalk and decreased data rates.
Innovation Solution
A signal processing method that determines when no downstream signal is present on certain subscriber lines, superimposes a signal X=(x1, x2, ..., xm) to ensure output is 0 after precoding, and shuts down front-end processing on those lines, using a precoding matrix P=H^-1 to maintain signal quality and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If front-end processing modules are shut down on idle subscriber lines to save power, then power consumption is reduced, but line SNR and communication quality deteriorate due to increased crosstalk
Solution Approach 1:
The patent applies preliminary anti-action by calculating and applying a compensation signal before the actual data transmission. The network side device determines idle subscriber lines, calculates compensation signals based on channel state information, and superimposes these signals onto the idle lines before normal operation. This pre-compensation prevents crosstalk from degrading the SNR of active lines, allowing front-end modules to be shut down on idle lines for power savings while maintaining communication quality.
Solution Approach 2:
The patent converts the harmful effect of idle lines causing crosstalk into a beneficial power-saving opportunity. By calculating compensation signals that actively cancel the crosstalk contribution from idle lines, the system can shut down front-end processing modules on these idle lines, transforming what was previously a source of interference into a power-saving resource while maintaining overall system performance.
2Productivity
If Vectored DSL technology is used to cancel far-end crosstalk and achieve high data rates, then data rate is improved, but system complexity increases due to joint processing requirements
Solution Approach 1:
The patent segments the subscriber lines into active lines and idle lines, allowing different processing strategies for each group. Idle lines receive compensation signals without requiring full front-end processing, while active lines undergo normal Vectored DSL joint processing. This segmentation reduces the overall computational complexity and processing requirements while maintaining the high data rates achieved through vectoring on active lines.
3Use of energy by moving object
If DMPS technology is used to shut down modules on idle lines, then power consumption is reduced, but crosstalk increases and degrades active line performance
Solution Approach 1:
The patent converts the harmful crosstalk effect from idle lines into a manageable parameter by calculating compensation signals that actively cancel this crosstalk. The compensation signal is designed based on the channel state information and the known characteristics of idle lines, transforming the crosstalk problem into a solvable mathematical issue that can be corrected through signal processing, thereby enabling DMPS operation without performance degradation.
Solution Approach 2:
The system performs preliminary anti-action by pre-calculating and applying compensation signals to idle lines before they can cause crosstalk interference to active lines. This proactive approach allows the system to shut down front-end modules on idle lines for power savings while the compensation signals prevent any degradation of active line performance.
Data Source
AI summary
Embodiments of the present invention provide a signal processing method in a DSL system. The method includes: determining that there is no to-be-sent downstream signal on m subscriber lines in n subscriber lines; superimposing a signal X on the m subscriber lines, so that a signal output on the m subscriber lines after precoding processing is 0, where xm indicates a signal component loaded on the mth subscriber line in the m subscriber lines; performing precoding processing on a downstream signal on the n subscriber lines; and sending the downstream signal that has undergone the precoding processing on another line except the m subscriber lines in the n subscriber lines. The embodiments of the present invention further provide a network-side device and a DSL system.