FEXT Cancellation Using Soft Data for Power Reduction
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Solution Overview
Problem
Conventional FEXT cancellation techniques in communication systems require significant power consumption and result in unstable noise filtering due to varying parameters at the receiver.
Innovation Solution
A network apparatus comprising a first equalization module, a multiplexer, a FEXT canceller, and a second equalization module, which operates in different modes to output either soft or hard data values for FEXT cancellation, minimizing parameter variations and reducing power consumption by enabling or disabling specific components based on operation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FEXT cancellers are disposed and simultaneously used at both the transmitter and the receiver, then FEXT cancellation capability is improved, but power consumption becomes significant
Solution Approach 1:
The invention extracts the FEXT cancellation function from the transmitter and concentrates it only at the receiver end. The transmitter removes the FEXT canceller, keeping only the equalization module, while the receiver retains the FEXT canceller to perform cancellation using soft data values from the equalization module. This extraction eliminates the need for dual-end FEXT cancellation hardware, significantly reducing overall system power consumption while maintaining effective FEXT cancellation capability.
Solution Approach 2:
The invention inverts the conventional approach by performing FEXT cancellation exclusively at the receiver end rather than at both transmitter and receiver. The receiver uses the equalization module to generate soft data values and feeds them to the FEXT canceller, which then cancels FEXT before the signal reaches the demodulator. This inversion consolidates the cancellation function at one end, reducing power consumption while maintaining or even improving cancellation effectiveness through the use of soft data values.
2Adaptability or versatility
If FEXT canceller parameters are continuously updated to adapt to varying conditions, then adaptability is improved, but parameter variations cause unstable noise filtering
Solution Approach 1:
The invention changes the type of data values used by the FEXT canceller from hard data (binary decisions) to soft data values (continuous probability values). The equalization module generates soft data values that represent the probability of each bit being 0 or 1, and these soft values are fed to the FEXT canceller. This parameter change allows the canceller to adapt to varying channel conditions while maintaining stable noise filtering, because soft data values provide more nuanced information that is less sensitive to parameter variations.
Solution Approach 2:
The invention implements a feedback mechanism where the equalization module continuously generates soft data values based on the received signal and channel conditions, and feeds these values to the FEXT canceller. The FEXT canceller uses these soft data values to compute and subtract FEXT components from the received signal. This feedback loop allows the system to adapt to changing conditions while maintaining stable performance, as the soft data values provide continuous information about signal quality and reliability.
Data Source
AI summary
The present invention provides a network apparatus capable of canceling far-end crosstalk (FEXT). When the network apparatus is under a training mode, hard data is provided to a FEXT canceller for performing FEXT cancellation. When the network apparatus is under a data mode, soft data is provided to the FEXT canceller for performing FEXT cancellation as well. Therefore, FEXT is effectively canceled, and consumption power of the network apparatus is saved.