Alien Interference Cancellation via Transformer Tap and Adaptive Filtering
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Solution Overview
Problem
10GBASE-T communication systems face significant performance degradation due to alien interference, particularly from external sources like adjacent cross-talking Ethernet ports and RF interferers, which existing standards poorly address, especially for long cable lengths or high signal power scenarios.
Innovation Solution
The implementation of an adaptive interference cancellation system using a common mode transformer and adaptive filters to determine and cancel alien interference, including RF interference, by tapping into a transformer on communication channels and using additional receiver paths for common mode noise detection and subtraction from data channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If higher signal power is used to improve transmission distance, then signal strength increases, but alien interference from adjacent channels increases
Solution Approach 1:
The patent captures the harmful alien interference signal through a transformer tap, processes it through adaptive filtering to create a canceling signal, and subtracts it from the received signal. This converts the harmful interference into a useful canceling signal that improves reception quality
Solution Approach 2:
The patent introduces an intermediary processing path that includes a transformer tap, adaptive filter, and subtractor. This intermediary system processes the interference signal separately and combines it with the main signal path to achieve cancellation without disrupting the primary transmission
2Object-affected harmful factors
If adaptive interference cancellation is implemented, then alien interference reduction improves, but device complexity increases
Solution Approach 1:
The patent uses a common mode transformer that serves multiple functions: it provides galvanic isolation for safety, enables signal transformation, and provides a tap for interference detection. This multi-functionality reduces the need for separate components and simplifies the overall system architecture
Solution Approach 2:
The system uses a portion of the received signal itself (tapped from the transformer) as the reference for generating the canceling signal. This self-service approach eliminates the need for external reference signals or additional sensing equipment, reducing system complexity
3Length of stationary object
If longer cable lengths are used to extend communication range, then transmission distance increases, but signal quality degrades due to accumulated interference
Solution Approach 1:
The patent implements a feedback mechanism where the received signal is continuously monitored, the alien interference component is extracted and processed, and the resulting canceling signal is fed back to the subtraction point to continuously compensate for interference. This continuous feedback loop maintains signal quality over extended cable lengths
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces alien crosstalk and RF interference, enhancing signal accuracy and robustness in communication systems, allowing for more reliable high-bandwidth data transmission.
Implementation Method 1
analog common mode noise signal from a communication channel is obtained by tapping into a transformer
Data Source
AI summary
Cancellation of alien interference in signals transmitted over communication channels. In one aspect, one or more signals are received at a receiver from a communication link, an alien interference in the received signals is determined based on at least one of the received signals, one or more canceling signals is determined based on the alien interference, and the canceling signals are used to reduce the alien interference in the one or more received signals.