Adaptive Impulse Noise Detection for DVB-T OFDM Receivers
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Solution Overview
Problem
Existing impulse noise detection and suppression systems in DVB-T receivers suffer from false detection and degradation of signal quality due to fixed detection and suppression parameters, which do not adapt to varying impulse noise frequencies, leading to erroneous suppression and distortion.
Innovation Solution
An adaptive impulse noise detection and suppression system that adjusts detection and suppression parameters based on characteristics of the received signal, using groups of samples to detect impulse noise pulses and dynamically adjusting parameters to minimize false detection and optimize noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed detection and suppression parameters are used in existing INDS systems, then impulse noise suppression is achieved when IN is present, but false detection occurs causing degradation of signal quality when IN is absent
Solution Approach 1:
The patent implements dynamic adaptation of detection and suppression parameters based on the observed characteristics of the received signal. The system continuously monitors signal properties and adjusts detection thresholds and suppression levels accordingly, transitioning from fixed parameters to adaptive parameters that respond to changing noise conditions, thereby reducing false detection while maintaining noise suppression effectiveness
Solution Approach 2:
The patent changes detection and suppression parameters based on the frequency and characteristics of impulse noise detected in the received signal. By monitoring the occurrence rate and properties of impulse noise events, the system dynamically adjusts detection thresholds and suppression strength, optimizing performance for current noise conditions rather than using static parameters designed for worst-case scenarios
2Measurement precision
If detection sensitivity is increased to detect more impulse noise, then noise reduction improves, but false detection rate increases causing erroneous suppression
Solution Approach 1:
The patent dynamically adjusts detection thresholds and sensitivity parameters based on the observed frequency and characteristics of impulse noise in the received signal. When impulse noise is frequently detected, the system increases detection sensitivity; when impulse noise is rare, it reduces sensitivity to avoid false detection, thereby optimizing the balance between detection accuracy and false alarm rate
Solution Approach 2:
The system implements feedback mechanisms where detection results are used to adjust subsequent detection parameters. The detector monitors its own performance and the characteristics of detected events, using this information to adaptively tune detection thresholds and parameters, creating a closed-loop system that reduces false detection while maintaining high detection accuracy
Data Source
AI summary
A method and apparatus for adaptive impulse noise detection and suppression (INDS) where information regarding detected impulse noise (IN) pulses is used to adjust detection and suppression parameters. To decrease the rate of false detection, groups of samples, instead of individual samples, of the digitized received signal are used to detect the presence of IN pulses. The method and apparatus for adaptive INDS may be used in communication systems employing single-carrier or multi-carrier modulation schemes, and is preferably used for Orthogonal Frequency Division Multiplexing (OFDM) modulation. The proposed adaptive INDS systems may be used to effectively reduce the effects of impulse noise and improve the quality of received signals.