NFC Interference Detection via Scanning Frame Frequency Modulation
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Solution Overview
Problem
Near Field Communication (NFC) signals are prone to interference, particularly in environments with electromagnetic interference, leading to unreliable communication quality, especially between capacitive touch screens and LCDs.
Innovation Solution
A method and system that utilize a scanning frame with multiple frequency symbols to detect interference frequency points, allowing for modulation adaptation to minimize interference and ensure communication quality by selecting frequency points with lower interference for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NFC communication is performed in a typical environment with electromagnetic interference, then communication can be established, but communication quality deteriorates due to interference from LCD driving signals and other sources
Solution Approach 1:
The system performs preliminary frequency scanning before actual data transmission to identify interference frequency points. The master device sends scanning frames with different frequency symbols, and both devices detect and report their respective interference frequency points in advance, allowing the system to select optimal frequencies before communication begins.
Solution Approach 2:
The system dynamically changes the frequency parameter of NFC communication based on detected interference. By adjusting the operating frequency to avoid identified interference frequency points, the system adapts to the electromagnetic environment and maintains reliable communication quality.
2Reliability
If frequency scanning is performed to detect interference frequency points, then communication quality improves, but communication time increases due to the scanning process
Solution Approach 1:
The frequency scanning process tests a limited set of predefined frequency symbols rather than continuously scanning the entire frequency spectrum. This partial action approach identifies interference frequency points efficiently without excessive time consumption, balancing quality improvement with time loss.
3Measurement precision
If detection frames with multiple frequency symbols are sent to identify interference, then interference frequency points can be identified, but the complexity of the communication protocol increases
Solution Approach 1:
The communication protocol is segmented into distinct phases: detection frame transmission, response frame transmission, and data transmission phase. Each phase has a specific function, and the frequency scanning is performed in dedicated detection frames separate from data transmission, organizing complexity into manageable segments.
Solution Approach 2:
The detection frame and response frame structures are designed to be universal, using standardized NFC frame formats that can carry both interference detection information and communication coordination data. This multi-functionality reduces the need for separate specialized protocols.
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
The solution effectively shields interference frequency points, enhancing communication stability and quality by adapting modulation based on detected interference, thereby improving NFC performance in challenging environments.
Implementation Method 1
Near Field Communication (NFC) utilizing electric field
Implementation Method 2
the scanning frame comprises at least two symbols modulated by using different frequencies
Data Source
AI summary
A method and a system for near field communication of an electronic device are disclosed. The method comprises: communicating frequency points at which the two parties suffer from interference with a second electronic device through a scanning frame, wherein the scanning frame comprises at least two symbols modulated by using different frequencies; and determining a modulation manner according to the available frequency points in order to perform data transmission with the second electronic device. With the embodiment of the present invention, interference frequencies in the communication environment are detected by sending the scanning frame which comprises at least two symbols modulated by using different frequencies, and frequency points with smaller interference are selected for adaptation modulation data, thus the interference frequency points are shielded from data transmission, and external interference in the near field communication is avoid, and communication stability is improved, and communication quality is improved.