Bandwidth Detection Filtering for Low-SNR Subchannel Identification

Solution Overview

Problem

In communication systems, especially those with low signal-to-noise ratio (SNR) or high interference, existing bandwidth detection methods using correlation operations or matched filters struggle to achieve high accuracy.

Innovation Solution

A bandwidth detection device comprising a receiving circuit, a filter circuit, and a processing circuit that transfers and compares frequency-domain signals using a filter function to determine if a subchannel contains transmitted data, employing techniques like channel frequency responses and energy level calculations to improve accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If correlation operation or matched filter is used for bandwidth detection, then the detection process is simple, but the measurement precision deteriorates in low SNR or high interference environments

Engineering Contradiction:

Improvedetection process complexityVSAvoidbandwidth information accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent introduces an intermediary filtering process between signal reception and bandwidth detection. A filter circuit is inserted to pre-process the received signals, removing noise and interference before the correlation operation. This intermediary step improves the signal quality and enables accurate bandwidth detection even in low SNR environments, resolving the contradiction between simple detection process and high measurement precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies preliminary action by performing filtering and signal processing before the actual bandwidth detection. The filter circuit conducts preliminary processing to enhance signal quality, and only after this preparation does the system perform the correlation operation for bandwidth detection. This preliminary action ensures that the subsequent detection can achieve high precision even in challenging low SNR conditions.

Inventive Principle:

Principle #10Preliminary action

2Device complexity

If traditional correlation operation is used for bandwidth detection, then the method is simple to implement, but the reliability deteriorates in low SNR environments

Engineering Contradiction:

Improvedetection method complexityVSAvoidbandwidth detection reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces an intermediary filtering process between signal reception and bandwidth detection. A filter circuit is inserted to pre-process the received signals, removing noise and interference before the correlation operation. This intermediary step improves the signal quality and enables accurate bandwidth detection even in low SNR environments, resolving the contradiction between simple detection process and high measurement precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies preliminary action by performing filtering and signal processing before the actual bandwidth detection. The filter circuit conducts preliminary processing to enhance signal quality, and only after this preparation does the system perform the correlation operation for bandwidth detection. This preliminary action ensures that the subsequent detection can achieve high precision even in challenging low SNR conditions.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If bandwidth detection is performed early to improve signal quality, then the signal processing efficiency improves, but the detection accuracy deteriorates in high interference environments

Engineering Contradiction:

Improvesignal processing efficiencyVSAvoidbandwidth information accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent introduces an intermediary filtering process between signal reception and bandwidth detection. A filter circuit is inserted to pre-process the received signals, removing noise and interference before the correlation operation. This intermediary step improves the signal quality and enables accurate bandwidth detection even in low SNR environments, resolving the contradiction between simple detection process and high measurement precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the parameter of signal processing by introducing a filter function that modifies the frequency characteristics of the received signals. The filter circuit adjusts the signal parameters (frequency response, amplitude) before bandwidth detection, enabling early processing to improve efficiency while maintaining accuracy through the modified signal parameters that are more resistant to interference.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10749712B2Device and method of performing bandwidth detection

Publication Date: 2020.08.18 REALTEK SEMICON CORP

AI summary

A bandwidth detection device comprises a receiving circuit, for receiving a first plurality of frequency-domain signals on a first subchannel; a filter circuit, coupled to the receiving circuit, for transferring the first plurality of frequency-domain signals to a first plurality of filtered frequency-domain signals according to a filter function; and a processing circuit, coupled to the filter circuit, for comparing the first plurality of frequency-domain signals with the first plurality of filtered frequency-domain signals, to determine whether the first subchannel comprises first transmitted data.