Burst Noise Suppression in Adaptive Equalizers
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Solution Overview
Problem
Conventional adaptive apparatuses, such as equalizers, are severely affected by burst noise, requiring a long time to recover from improper states, which disrupts normal operation and data recovery in high-frequency radio signal receiving systems.
Innovation Solution
A burst noise suppressing apparatus that includes a burst noise detector and an ON/OFF switching unit to stop coefficient updates in the equalizer during noise detection, either freezing or restoring coefficients to prevent interference, using SNR measurement, error estimators, and histogram analysis to identify burst noise and control the equalizer's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the error estimator continuously updates the coefficients of the adaptive apparatus, then the equalizer can adapt to long-term channel states, but it becomes severely affected by burst noise and requires a long time to recover from improper states
Solution Approach 1:
The invention stores good coefficients in advance before burst noise occurs. The storage unit saves coefficient values from periods when the channel state is normal, so when burst noise is detected, these pre-stored good coefficients can be immediately restored without needing to wait for the equalizer to naturally recover from the noisy state.
Solution Approach 2:
The invention implements a feedback mechanism where the burst noise detector monitors the input signal for noise conditions and feeds back control signals to the switching unit. When burst noise is detected, the feedback loop automatically switches from using current coefficients to restoring pre-stored good coefficients, creating a closed-loop system that adapts to noise conditions.
2Productivity
If the equalizer processes signals continuously with updating coefficients, then data recovery can proceed without interruption, but burst noise triggers improper state transitions that require extensive recovery time
Solution Approach 1:
The invention extracts and separates the coefficient updating function from the main signal processing path by introducing a switching unit and storage unit. This allows the system to selectively bypass the error estimator during burst noise periods, extracting only the necessary coefficient values from storage rather than continuously processing through the error-prone updating path.
Solution Approach 2:
The invention applies preliminary anti-action by detecting burst noise and immediately counteracting its effect through coefficient restoration before the noise can cause significant degradation. The switching unit responds to noise detection by restoring pre-stored good coefficients, effectively neutralizing the harmful impact of burst noise on the equalization process.
Data Source
AI summary
An apparatus performs burst noise detection and then reduce the interference of the burst noise by controlling an operation of an adaptive apparatus, such as an equalizer. It includes: an adaptive apparatus having multiple coefficients, processing incoming signals according to these coefficients, and employing an error estimator to update the coefficients; a burst noise detector used to detect a burst noise; and an ON/OFF switching unit used to stop the error estimator from updating the coefficients when the burst noise is detected.