Non-Intrusive DSL Transmitter Adjustment for Crosstalk Reduction
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Solution Overview
Problem
DSL communication systems face performance degradation due to changing operational environments, leading to suboptimal transmitter settings that result in poor signal-to-noise ratios and high bit error rates, with existing technologies lacking the ability to adjust transmit power after initialization, causing significant performance degradation before triggering a retrain operation.
Innovation Solution
A digital-subscriber-line (DSL) communication system with a transceiver and controller that monitors performance parameters and performs non-intrusive transmitter adjustments, such as dynamic power back-off and precoder coefficient updates, to maintain optimal settings without disrupting service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmitter settings are optimized during initialization, then the DSL link achieves acceptable performance at startup, but the transmitter settings become suboptimal over time as the operational environment changes
Solution Approach 1:
The patent implements dynamic adjustment of transmitter settings (precoder coefficients and transmit power) during the showtime operational mode. The system continuously monitors performance parameters and automatically retunes transmitter parameters without taking the line out of service, transforming the static initialization process into a dynamic adaptive system that responds to changing line conditions.
Solution Approach 2:
The DSL system performs self-diagnosis and self-adjustment by monitoring its own performance parameters (SNR margins, bit error rates) and automatically initiating non-intrusive retrain operations when degradation is detected. This eliminates the need for external intervention or manual reconfiguration, allowing the system to maintain optimal performance autonomously.
2Reliability
If the line is retrained when performance falls below a threshold, then transmitter settings are updated to improve performance, but the line is taken out of service during retraining
Solution Approach 1:
The patent introduces a dynamic performance monitoring system that continuously tracks SNR margins and bit error rates during showtime operation. When performance degradation is detected, the system dynamically transitions from static operation to non-intrusive retrain mode, adjusting transmitter parameters in real-time without interrupting service, thus maintaining both reliability and productivity.
Solution Approach 2:
The system implements a closed-loop feedback mechanism where performance parameters are continuously monitored and fed back to the controller. When performance metrics indicate degradation, the feedback triggers a non-intrusive retrain operation that adjusts transmitter settings and verifies improvement, creating a self-correcting system that maintains optimal performance without service interruption.
3Reliability
If transmit power is increased to overcome noise environment, then signal-to-noise ratio improves, but cross-talk increases and power consumption rises
Solution Approach 1:
The patent implements precise parameter optimization by dynamically adjusting transmit power levels based on real-time SNR margin measurements. Rather than using fixed high power settings, the system optimizes power consumption by setting transmit power to the minimum level required to maintain acceptable SNR margins, thereby reducing cross-talk and energy waste while ensuring reliable communication.
Solution Approach 2:
The system applies localized optimization by adjusting precoder coefficients specifically tailored to the characteristics of each DSL link. This targeted approach improves SNR margins for individual lines without unnecessarily increasing overall transmit power, thereby minimizing cross-talk impact on neighboring lines while maintaining local communication quality.
Data Source
AI summary
In one embodiment, a first device for communicating over a digital-subscriber-line (DSL) line comprises a digital-subscriber-line transceiver to transmit and receive data over the DSL link. A set of one or more performance parameters are associated with the DSL link by which the quality of the DSL link can be determined. The first device further comprises a controller coupled to the digital-subscriber-line transceiver. The controller causes a non-intrusive transmitter adjustment operation to be performed by the digital-subscriber-line transceiver.