Adaptive Power Adjustment for DSL Crosstalk Reduction
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Solution Overview
Problem
Current DSL communication systems face significant performance deterioration due to far-end crosstalk, which limits line activation rates and requires manual spectrum configuration, leading to inefficient spectrum utilization and increased workload.
Innovation Solution
A method for adaptive power adjustment that calculates and controls the transmitting power spectrum density based on crosstalk power, electrical length, and noise levels, dynamically managing spectrum to reduce crosstalk and automate configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If carriers in frequency bands are switched off to prevent crosstalk, then crosstalk interference is reduced, but transmission performance deteriorates rapidly with increasing transmission distance
Solution Approach 1:
The patent implements dynamic power adjustment where the power spectrum density is continuously adapted based on real-time crosstalk conditions and line characteristics. Instead of statically switching off carriers, the system dynamically modifies transmitting power levels across different frequency bands, allowing the system to respond to changing crosstalk conditions while maintaining transmission performance over various distances
Solution Approach 2:
The patent changes the parameter of transmitting power spectrum density based on calculated crosstalk power and line characteristics. By adjusting power levels as a function of frequency, crosstalk power, and electrical length, the system optimizes the balance between reducing interference and maintaining transmission reliability without permanently disabling frequency bands
2Object-affected harmful factors
If fixed spectrum setting is employed to manage crosstalk, then spectrum compatibility is ensured, but spectrum utilization becomes inefficient and manual configuration workload increases
Solution Approach 1:
The patent enables the system to automatically calculate and adjust its own power spectrum density based on measured crosstalk conditions and line characteristics. The system performs self-configuration without manual intervention, computing the optimal power distribution across frequency bands based on actual operating conditions, thereby improving spectrum utilization efficiency while maintaining compatibility
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors crosstalk power and line characteristics, then uses this information to adjust the transmitting power spectrum density. This closed-loop control allows the system to adapt to changing conditions and optimize spectrum utilization dynamically while ensuring compatibility
3Speed
If bandwidth is expanded in xDSL technique to increase transmission rates, then transmission capacity increases, but crosstalk in high frequency bands becomes increasingly significant
Solution Approach 1:
The patent applies different power levels to different frequency bands based on their specific crosstalk characteristics. By analyzing the power spectrum density of crosstalk across the bandwidth, the system identifies which frequency regions suffer from severe crosstalk and adjusts power locally in those regions while maintaining higher power levels in cleaner frequency bands, thus preserving transmission capacity while mitigating crosstalk
Data Source
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AI summary
An adaptive power adjustment method and means based on reducing crosstalk among DSL lines includes: calculating the crosstalk power spectrum density and the crosstalk function from the neighboring line in current line; calculating the transmission power spectrum density of the current terminal device according to the obtained crosstalk power spectrum density and crosstalk function; and the current terminal device controlling the transmission power based on the transmission power spectrum density. According to the adaptive power adjustment method of the present invention, the transmission power can be increased or decreased. The disadvantageous effect due to the crosstalk among xDSL lines is reduced. Present invention can eliminate or reduce adequately the strong impact on remote terminal application scene, and make the lines achieve the optimum operation state.