Adaptive Impulse Noise Canceler for Telecommunication Lines
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Solution Overview
Problem
Current methods for mitigating impulse noise in telecommunication lines, such as error correcting coding and noise estimation, face challenges in balancing data reliability and speed, with error correcting coding introducing significant delay and noise estimation being inaccurate due to unpredictable noise shapes.
Innovation Solution
An adaptive impulse canceler system that detects noise impulses in the common mode component of signals, learns transfer functions for different noise shapes, and uses these to estimate and subtract noise from the differential mode component, thereby canceling impulse noise with reduced delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error correcting coding with interleaving is used to recover corrupted bits, then data reliability is improved, but transmission delay increases significantly
Solution Approach 1:
The patent applies preliminary action by detecting noise impulses in the common mode component before they corrupt the differential mode signal, and subtracting their effect in advance. This proactive approach prevents corruption rather than recovering from it, eliminating the need for delay-intensive error correcting coding and interleaving while maintaining data reliability
Solution Approach 2:
The patent extracts the noise impulse component from the common mode signal and removes its effect from the differential mode signal through subtraction. By separating and eliminating the harmful noise component beforehand, the system avoids the need for time-consuming error detection and correction processes, thus resolving the contradiction between reliability and delay
2Productivity
If noise estimation and cancellation is used to avoid delays, then transmission speed is improved, but noise cancellation accuracy deteriorates due to unpredictable noise shapes
Solution Approach 1:
The patent employs feedback by continuously monitoring the common mode component for noise impulses and using this information to adjust and refine the noise estimation for the differential mode component. This closed-loop approach adapts to varying noise shapes in real-time, maintaining high cancellation accuracy while avoiding the delays associated with traditional error correcting coding
Solution Approach 2:
The patent uses the common mode component as an intermediary to detect and characterize noise impulses, which then informs the cancellation process in the differential mode component. This intermediary approach enables accurate noise estimation despite unpredictable noise shapes, resolving the contradiction between speed and accuracy
Data Source
AI summary
A system for canceling impulse noise comprises an adaptive impulse canceler and a combiner. The adaptive impulse canceler is configured to receive a common mode component of a received signal and to detect a noise impulse in the common mode component. The impulse canceler is further configured to provide, based on the noise impulse in the common mode component, an impulse noise estimation for a differential mode component of the received signal. The combiner is configured to receive the differential mode component and the impulse noise estimation and to subtract the impulse noise estimation from the differential mode component.