NFC Tag Reader Impulse Response Detection
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Solution Overview
Problem
Existing Near Field Communication (NFC) Low Power Tag Detection methods suffer from high power consumption and unreliable tag detection due to false positives caused by metallic or lossy objects, which are mistaken for tags, leading to inefficient battery drainage in mobile devices.
Innovation Solution
An advanced Low Power Tag Detection method utilizing the impulse response of the reader transmitter, stimulated by a maximal length sequence, to differentiate between tag presence and other objects, providing improved robustness and reduced false detection rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reader uses periodic polling with full power output to detect tag presence, then tag detection capability is improved, but power consumption increases significantly
Solution Approach 1:
The reader performs tag detection periodically rather than continuously, using intermittent polling with full power output only when needed, thereby reducing overall power consumption while maintaining reliable tag detection capability
Solution Approach 2:
The reader uses low power chirp stimulus for routine detection and reserves full power output for confirmation or active communication only when a tag is detected, avoiding excessive power consumption during normal operation
2Use of energy by moving object
If the reader uses Low Power Tag Detection with chirp stimulus to reduce power consumption, then power consumption is reduced, but false tag detection occurs due to detuning from metallic or lossy objects
Solution Approach 1:
The system measures the impulse response of the reader transmitter and compares it against expected tag responses, using this feedback to distinguish between genuine tag presence and false detuning caused by metallic or lossy objects, thereby improving detection accuracy
Solution Approach 2:
The patent introduces an intermediary verification step using impulse response analysis between the low-power detection and full-power confirmation, acting as a filter to eliminate false positives before triggering full tag communication
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly reduces power consumption and enhances detection reliability by using impulse response analysis, allowing for more accurate identification of tags and minimizing false positives from metallic or lossy objects.
Implementation Method 1
stimulating the transmitter (1, 2) of the reader (5) with a signal representative of a pseudo-random binary sequence so as to generate an output signal based on the impulse response of said transmitter (1, 2)
Data Source
AI summary
A Near Field Communication method performed by a tag reader detects whether a tag is present. The method includes stimulating the tag reader's transmitter to generate an impulse response, evaluating the impulse response generated by the transmitter to obtain an evaluated impulse response, and assessing whether a tag is present based on the evaluated impulse response.