Adaptive Load Modulation for Near Field Communication Synchronization
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Solution Overview
Problem
Current near field communication technologies face challenges in enhancing communication quality, particularly due to synchronization losses that can occur at varying distances and frequencies, affecting the reliability and efficiency of data transmission.
Innovation Solution
A communication system comprising a phase synchronizer, a modulator, and a detector that generates and modulates signals to detect synchronization loss, allowing for adaptive modulation between active and passive load modulation to maintain communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase locked loop (PLL) circuits are used for signal generation, then signal synchronization is improved, but synchronization loss occurs at varying distances and frequencies
Solution Approach 1:
The patent implements a feedback mechanism where the communication device detects synchronization status between the first signal from the communication partner and the second signal generated by the phase synchronizer. When desynchronization is detected, the system switches from active load modulation to passive load modulation, and vice versa when synchronization is restored. This feedback-based adaptive switching resolves the contradiction by maintaining reliability through PLL-based synchronization while adapting to varying communication conditions that cause synchronization loss.
Solution Approach 2:
The patent dynamically switches between two modulation modes (active and passive load modulation) based on real-time synchronization detection. The modulation type is not fixed but changes adaptively according to the detected synchronization status. This dynamic approach allows the system to maintain reliable communication across varying distances and frequencies by selecting the appropriate modulation mode, thereby resolving the contradiction between PLL-based synchronization reliability and adaptability to different communication conditions.
2Productivity
If active load modulation is used, then communication efficiency is improved, but unnecessary radio signal output occurs during synchronization loss
Solution Approach 1:
The system uses feedback from the synchronization detector to control the modulation type. When desynchronization is detected, the system automatically switches from active to passive load modulation, preventing unnecessary radio signal output. When synchronization is restored, it switches back to active modulation for efficient communication. This feedback-based control resolves the contradiction by eliminating harmful radio signal output during synchronization loss while maintaining high communication efficiency during synchronized operation.
Solution Approach 2:
The patent extracts and separates the harmful effect (unnecessary radio signal output during desynchronization) by switching to passive load modulation when synchronization is lost. This allows the system to remove the harmful radiation while maintaining communication capability through passive modulation, thereby resolving the contradiction between communication efficiency and harmful radio signal output.
3Reliability
If synchronization detection is implemented, then communication quality is enhanced, but device complexity increases
Solution Approach 1:
The phase synchronizer and detector components serve multiple functions: generating the second signal, detecting synchronization status, and controlling modulation type switching. By making these components multi-functional, the patent enhances communication quality through synchronization detection while minimizing the increase in device complexity, as the same hardware structures perform multiple critical functions rather than requiring separate dedicated components for each function.
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 system effectively prevents unnecessary radio signal output and enhances communication quality by detecting and addressing synchronization losses, ensuring reliable data transmission within the near field communication frequency band.
Implementation Method 1
some electronic circuits use phase locked loop (PLL) circuits, as disclosed in PTL 3, for example
Implementation Method 2
the card subjects data to a load modulation and then transmits this data to the reader-writer
Implementation Method 3
The detector detects that synchronization between the first signal and the second signal is lost
Data Source
AI summary
A communication device of the disclosure includes a phase synchronizer, a first modulator, and a detector. The phase synchronizer generates a second signal on a basis of a first signal received from a communication partner. The first modulator is able to modulate the first signal on a basis of the second signal. The detector detects that synchronization between the first signal and the second signal is lost.