XDSL Transmitter Power Control for Signal Stability
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Solution Overview
Problem
Existing XDSL communication systems face instability due to rapid changes in noise conditions, which can lead to corrupt data frames, as the bit swap mechanism in current technologies is limited in its ability to adapt quickly to changing channel characteristics and noise levels, especially under high noise conditions.
Innovation Solution
A method that involves the transmitter increasing transmit power equally across multiple data carriers in response to a request from the receiver to improve signal quality, followed by a bit swap to fine-tune the power spectral density, ensuring a stable signal-to-noise ratio and reducing the likelihood of corrupt frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bit swap mechanism is used to adapt to changing noise conditions, then the system can adjust the power spectral density, but the adaptation speed is too slow to keep up with rapid noise changes
Solution Approach 1:
The invention changes the fundamental parameter of power spectral density by applying a power ramping factor to all carriers simultaneously, rather than adjusting individual carrier powers through bit swaps. This allows rapid adaptation to noise changes by scaling the overall power distribution, achieving both speed and adaptability improvements.
2Adaptability or versatility
If the bit swap mechanism includes all carriers to improve adaptability, then the power spectral density can be adjusted more comprehensively, but the message size increases and corruption probability rises under high noise conditions
Solution Approach 1:
The invention merges the power adjustment function into the existing power spectral density framework by applying a unified power ramping factor across all carriers. This combines the adaptability of comprehensive adjustment with the reliability of efficient message transmission, as the power factor can be conveyed through existing control channels without requiring large separate messages.
3Reliability
If the transmit power is increased to improve signal-to-noise ratio, then the data signal quality improves, but the power spectral density distribution may become unbalanced
Solution Approach 1:
The invention applies local quality by maintaining the relative power distribution among different carriers while scaling the overall power level. Each carrier receives the same power ramping factor, preserving the original power spectral density shape and balance, yet achieving the desired signal-to-noise ratio improvement through uniform scaling.
Data Source
AI summary
The present invention relates to a method for data-signal quality control, a related receiver and a related transmitter in an XDSL communications system, where this XDSL communications system comprises a transmitter and a receiver. The transmitter is coupled to the receiver over an XDSL line, over which the transmitter sends a data-signal on a plurality of data carriers for carrying this data-signal from the transmitter to the receiver. This receiver analyses a quality of the data-signal received by the receiver and subsequently requests the transmitter, in case this quality of the data-signal is beneath a predefined level to improve the quality of the data-signal, by performing an equal transmit power increase over a plurality of the data-carriers. The transmitter in response to the requesting improves the data-signal by performing an equal transmit power increase over at this plurality of data-carriers.