Signal Detection Device for Wireless Interference Analysis
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Solution Overview
Problem
Current signal detection methods for wireless communication devices, particularly those using the ISM band, face challenges in efficiently identifying interference sources like microwave ovens due to the prolonged time required to determine the periodic nature of radio wave signals, especially when inverter microwave ovens are involved and their operation is intermittent.
Innovation Solution
A signal detection device that calculates signal levels, variations, and statistics over predetermined time periods to determine the presence and characteristics of interference source signals, allowing for faster identification of interference sources by analyzing temporal variations and block levels, even in the presence of other signals or noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal detection is performed by detecting periodic nature of radio wave signals, then interference source signals can be detected, but the time required for detection is prolonged
Solution Approach 1:
The patent divides the detection process into multiple stages: initial quick detection using signal level thresholds, followed by periodicity verification only for signals that pass the initial filter. This segmentation allows most signals to be quickly filtered out without full periodicity analysis, reducing overall detection time while maintaining accuracy for actual interference sources
Solution Approach 2:
The patent performs preliminary filtering using signal level thresholds and basic characteristics before conducting the more time-consuming periodicity detection. This preliminary action eliminates obviously non-interference signals early in the process, so that full periodicity analysis is only applied to candidate signals, significantly reducing total detection time
2Measurement precision
If multiple signal receptions are performed to determine periodic nature, then detection accuracy is improved, but detection time is prolonged
Solution Approach 1:
The patent applies partial periodicity verification - performing periodicity checks on a subset of received signals rather than all signals. By combining this with initial filtering, the system achieves sufficient detection accuracy without requiring multiple full periodicity verifications for every signal, thus reducing detection time while maintaining measurement precision for candidate interference sources
3Reliability
If inverter microwave oven operation is monitored, then interference detection is performed, but detection becomes difficult when operation is temporarily stopped
Solution Approach 1:
The patent implements dynamic detection thresholds and adaptive monitoring that adjust based on observed signal characteristics and operational patterns. When temporary stoppages are detected, the system adapts by extending monitoring windows or adjusting sensitivity, allowing reliable detection of inverter microwave ovens regardless of their operational state or temporary interruptions
Data Source
AI summary
A signal detection device according to the embodiment of the present invention includes a memory and processing circuitry. The memory is configured to store a program. The processing circuitry is for executing the program and is configured to calculate a first signal level indicative of a signal level of a digital complex signal; calculate a first variation indicative of a temporal variation of the first signal level; calculate a statistic in a predetermined first time period on the basis of the first variation within the first time period; and determine, on the basis of the statistic in the first time period, whether or not an interference source signal indicative of a signal of a radio wave coming from an interference source is included in the digital complex signals within the first time period.