Subscriber Device Transmit Power Spectrum Adjustment for Crosstalk Equalization
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Solution Overview
Problem
In DSL communication networks, near-end and far-end crosstalk due to wire pair interactions lead to unequal interference power spectral densities across different subscriber lines, causing data rate disparities among subscribers, especially when all devices transmit with the same power spectral density.
Innovation Solution
A device and method for adjusting the transmit power spectrum of subscriber devices, involving the determination and modification of attenuation measures and shaping coefficients to equalize interference power spectral densities, allowing for frequency-dependent shaping of the transmit power spectrum to optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If all subscriber devices transmit with the same transmit power spectral density, then the transmission simplicity is maintained, but the interference power spectral density becomes unequal across different subscriber lines causing data rate disparities
Solution Approach 1:
The patent applies parameter changes by modifying the transmit power spectral density parameter for different subscriber devices based on their line characteristics. Specifically, devices with shorter line lengths reduce their transmit power in frequency ranges where they would cause excessive far-end crosstalk to longer lines, while maintaining higher power where it benefits their own transmission. This dynamic parameter adjustment resolves the contradiction by enabling equal data rates across subscribers while managing interference.
2Power
If subscriber devices on shorter lines transmit with high power, then their own signal strength is improved, but they cause excessive far-end crosstalk interference to subscriber devices on longer lines
Solution Approach 1:
The patent implements local quality by applying different transmit power spectral density adjustments to different subscriber devices based on their specific line length characteristics. Shorter lines apply greater power reduction in frequency ranges where they would cause excessive far-end crosstalk to longer lines, while longer lines maintain higher power levels. This localized, differentiated approach allows each device to optimize its own signal strength while minimizing harm to others.
Solution Approach 2:
The patent converts the harmful effect of far-end crosstalk into a beneficial outcome by having shorter-line devices intentionally reduce their transmit power in specific frequency ranges. This power back-off, while reducing their own potential signal strength, prevents excessive interference to longer-line devices and enables the network to achieve equal data rates for all subscribers. The harm (potential for excessive interference) is transformed into a benefit (equalized service quality across the network).
Data Source
AI summary
A device for adjusting a transmit power spectrum of a subscriber device of a communication network, having a means for receiving an attenuation measure for an attenuation, which a signal experiences on its way from a transmit/receive means to the subscriber device of the communication network connected to the transmit/receive means, from the subscriber device, a means for determining a modified attenuation measure and shaping coefficients for a frequency-dependent shaping of the transmit power spectrum based on the attenuation measure determined by and received from the subscriber device, and a means for transferring the modified attenuation measure and the shaping coefficients to the subscriber device.