Variable Data Rate Physical Layer for Magnetic Field Communication
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Solution Overview
Problem
Conventional magnetic field-based low-frequency wireless communication systems are inflexible and inefficient in adapting to varying environments due to fixed data rates and coding methods, restricting communication performance and preventing active communication from tags to interrogators.
Innovation Solution
A method that configures the physical layer to allow variable data rates and coding methods for payload fields in request and response frames, using a combination of Manchester and NRZ-L coding with BPSK modulation, and enables active communication from tags to interrogators, allowing adaptive communication based on environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed data rate and coding method are used in conventional low-frequency wireless communication, then device complexity is reduced and ease of manufacture is improved, but adaptability to varying communication environments deteriorates and communication efficiency is reduced
Solution Approach 1:
The patent implements dynamic selection of data rates and coding methods based on communication environment conditions. The system can adaptively switch between different data rates (e.g., 1200 bps, 2400 bps, 4800 bps) and coding schemes (e.g., 1/2 rate, 2/3 rate, 3/4 rate) to optimize performance for specific environmental conditions such as underground, underwater, or metallic environments, thereby resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The patent changes physical parameters including data rate, coding rate, and modulation scheme based on detected communication environment characteristics. By adjusting these parameters dynamically, the system achieves adaptability to varying environments without requiring complete system redesign, thus improving adaptability while controlling device complexity.
2Productivity
If passive tags are used in conventional low-frequency wireless communication, then power consumption is reduced and ease of operation is improved, but communication performance and productivity deteriorate due to inability to perform active communication
Solution Approach 1:
The patent employs periodic communication modes where tags can operate in passive mode during certain periods to conserve energy, and switch to active mode during other periods when higher communication efficiency is required. This periodic switching between operational states allows the system to achieve high productivity when needed while maintaining low power consumption during non-critical periods.
3Reliability
If variable data rates and coding methods are implemented, then adaptability to communication environment is improved and communication performance is enhanced, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the system detects communication environment conditions and uses this information to select appropriate data rates and coding methods. The feedback loop continuously monitors communication quality and adjusts parameters accordingly, ensuring high reliability while managing device complexity through intelligent control rather than hardware complexity.
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 approach enhances communication performance and efficiency by allowing dynamic adjustment of data rates and coding methods, improving communication reliability in poor environments and enabling active communication from tags.
Implementation Method 1
an RFID technology using a low frequency (LF) in a band equal to or lower than 135KHz operates based on a magnetic field
Implementation Method 2
using a combination of Manchester and NRZ-L coding with BPSK modulation
Implementation Method 3
BPSK modulation
Data Source
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AI summary
The present invention relates to a method for configuring a physical layer of a low frequency band based on wireless magnetic field communication, and a computer-readable recording medium including a program for executing the method. The method supports the proper packet format, coding mode, and modulation mode between a master and a slave in order to enable wireless communication in variable data rate or coding modes depending on a peripheral environment in a low frequency band based on wireless magnetic field communication which is applied to a difficult environment. The method of the invention is characterized by changing the data rate and the coding mode of a payload field within a preset range depending on the peripheral communication environment, wherein the payload field is included in the request and response frames between the master and the slave. The request and response frames can be configured in the same format in the above-mentioned configuration and respectively include a preamble field, a header field, and the payload field.