Dual High-Pass Filter Selection for Impulse Noise Mitigation
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Solution Overview
Problem
Existing impulse noise mitigation techniques in wireless communication receivers are ineffective in detecting impulse noise under high carrier-to-interference ratios in the time domain and out-of-band interferers in the frequency domain, leading to unreliable noise detection and mitigation.
Innovation Solution
The implementation of two complex high pass filters that selectively admit frequency components above and below the desired signal bandwidth, with a state machine determining which filter to use based on mean magnitude measurements over a time interval T to optimize noise mitigation and reduce energy from other interferers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional impulse noise mitigation techniques are used in the time domain, then impulse noise detection is performed, but detection is ineffective under high carrier-to-interference ratios
Solution Approach 1:
The patent divides the frequency spectrum into multiple bands using separate bandpass filters, allowing impulse noise detection in specific frequency regions where interference is minimized. This segmentation enables reliable detection even when overall carrier-to-interference ratio is high, as detection occurs in cleaner spectral regions.
Solution Approach 2:
The patent transitions from time-domain analysis to frequency-domain analysis by using bandpass filters and spectral decomposition. This dimensional change allows impulse noise to be distinguished from interference by examining frequency characteristics rather than temporal patterns alone, improving detection reliability under high carrier-to-interference conditions.
2Reliability
If frequency domain techniques are used for impulse noise mitigation, then impulse noise detection is attempted, but detection becomes unreliable due to out-of-band interferers
Solution Approach 1:
The patent applies different filtering characteristics to different frequency bands, with each bandpass filter optimized for specific frequency regions. This local quality approach allows the system to detect impulse noise in bands with favorable signal-to-interference characteristics while rejecting out-of-band interferers that would contaminate broad-band frequency domain analysis.
Solution Approach 2:
The patent introduces bandpass filters as intermediary elements between the received signal and the impulse noise detection process. These filters act as mediators that selectively pass frequency components containing impulse noise while blocking out-of-band interferers, enabling reliable detection that would otherwise be impossible in the presence of strong out-of-band signals.
3Measurement precision
If multiple filters are used to improve impulse noise detection, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The patent segments the frequency spectrum into discrete bands using a bank of bandpass filters, with each filter targeting specific frequency regions where impulse noise may occur. This segmentation provides a systematic approach to improving detection accuracy while maintaining manageable complexity through modular filter design and selective activation based on detected interference conditions.
Data Source
AI summary
An impulse noise mitigation circuit (INMC) may set a cut-off frequency of each of two high pass filters to bound a frequency bandwidth of a desired signal, wherein a first of the two filters allows frequencies higher than the frequency bandwidth of the desired signal, and a second of the two filters allows frequencies lower than the frequency bandwidth of the desired signal. The INMC may compute and store a mean magnitude separately for a first signal response of the first filter and a second signal response of the second filter. The INMC may select the first filter for impulse noise mitigation when the mean magnitude of the second filter is greater than the mean magnitude of the first filter. The INMC may select the second filter for impulse noise mitigation when the mean magnitude of the first filter is greater than the second filter.