DSL Transceiver Power Reduction via DMT Tone Segmentation
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Solution Overview
Problem
DSL systems face high power consumption and non-stationary crosstalk interference due to sudden transitions between power management states, particularly when switching from idle to normal operation mode, which operators are reluctant to use due to stability issues.
Innovation Solution
Implementing a low power mode using a subset of DMT tones for data transmission and employing peak-canceling signals to reduce Peak-to-Average Ratio (PAR), allowing the system to maintain reduced power consumption and minimize crosstalk interference by monitoring only active tones and using unused tones for peak cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the DSL link switches from L2 state to L0 state to resume normal operation, then the data transmission capability is restored, but the transmission PSD suddenly increases causing non-stationary crosstalk that degrades reception stability
Solution Approach 1:
The system performs preliminary actions by gradually increasing the transmission PSD and activating tones in a staged manner before full normal operation. The transition involves first increasing PSD while keeping tones limited, then progressively activating more tones over multiple frames, preventing sudden crosstalk spikes that would degrade reception stability.
Solution Approach 2:
The patent implements dynamic transition mechanisms where the system adapts its behavior based on current state. During L2 to L0 transitions, the PSD and active tone count are dynamically adjusted over multiple OFDM frames rather than changing abruptly, creating a smooth dynamic transition that maintains reception stability while restoring full data transmission capability.
2Productivity
If more DMT tones are used for data transmission, then the data rate increases, but the peak power increases causing higher power consumption
Solution Approach 1:
The patent segments the DMT tones into different groups and activates them progressively during state transitions. Instead of activating all tones simultaneously when switching from L2 to L0, the system divides tone activation across multiple frames, enabling data rate increase while controlling peak power consumption through staged tone activation.
Solution Approach 2:
The system changes parameters (PSD level and active tone count) in controlled steps rather than making abrupt changes. By adjusting PSD and tone activation as varying parameters over multiple frames, the patent achieves higher data rates while managing peak power consumption to avoid excessive energy usage.
Data Source
AI summary
An apparatus comprising a transmitter configured to transmit a low power mode Discrete Multi-Tone (DMT) signal using a plurality of DMT tones, wherein a subset of the DMT tones are used for transmitting data, and wherein at least some of the remaining DMT tones are used for a Peak-to-Average Ratio (PAR) reduction is disclosed. Included is a network component comprising at least one processor configured to implement a method comprising promoting transmission of a plurality of data streams using a plurality of first digital tones, and promoting transmission of at least one second digital tone that reduces a peak of a signal generated by at least one of the first digital tones.