Interference Detection in Low-Power Envelope Receivers
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Solution Overview
Problem
Low-power wireless sensor networks face reliability issues due to outside interference signals, which affect communication between transmitters and receivers, particularly in ultra low-power RF structures used in wireless body area networks, where detecting interference is challenging using existing modulation schemes.
Innovation Solution
A device and method that estimate the mean value of received signals, filter low-frequency bands, and use both coherent and non-coherent modulation schemes to detect interference signals, combining detection results based on preset conditions to determine interference presence and switch frequency channels accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If ultra low-power RF structure is used, then power consumption is reduced, but communication reliability deteriorates due to outside interference signals
Solution Approach 1:
The interference detection function is segmented into separate coherent and non-coherent detectors, each handling specific types of interference signals. This allows the low-power receiver to detect interference without requiring high transmission power, thus maintaining communication reliability while keeping power consumption low.
Solution Approach 2:
An interference detection device is introduced as an intermediary component between the ultra low-power receiver and the communication system. This intermediary detects interference signals using both coherent and non-coherent modulation schemes, enabling the receiver to identify and mitigate interference without increasing its own power consumption.
2Use of energy by moving object
If low-power envelope detection receiver is used, then power requirements are reduced, but detection of interference signals becomes more difficult
Solution Approach 1:
Both coherent and non-coherent modulation schemes are merged into a single interference detection system. The coherent detector handles interference with known characteristics while the non-coherent detector handles unknown interference, combining their outputs to achieve comprehensive interference detection capability in the low-power receiver.
Solution Approach 2:
The interference detection device is designed with multi-functionality, capable of detecting interference signals through both coherent and non-coherent modulation schemes. This universal detection capability allows the low-power envelope detection receiver to identify various types of interference signals without requiring multiple separate detection systems, thus reducing overall power requirements.
Data Source
AI summary
A device for detecting an interference signal includes an estimator configured to estimate a mean value of received signals output from an analog-digital converter (ADC), a filter configured to filter a low frequency band of the received signals using the estimated mean value to produce filtered received signals, a detector configured to detect, from the filtered received signals, interference signals using a coherent modulation scheme and a non-coherent modulation scheme, and a combiner configured to determine whether interference exists in a frequency channel in response to a result of the interference signal detecting using the coherent modulation scheme and the non-coherent modulation scheme, based on a preset condition.