NFC Dual-Channel Reception Using Phase-Shifted Signal Selection
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Solution Overview
Problem
Existing NFC devices face challenges in improving reception performance, particularly in the reader mode, which is crucial for mobile payments and electronic transactions, due to noise amplification and inefficient channel selection methods.
Innovation Solution
The NFC device generates digital signals through multiple channels with phase differences, performs convolution operations using sub-filter coefficients to decode these signals, and selects the transmission channel based on decoded and convolution result data to enhance reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the NFC device uses traditional single-channel reception methods, then the device complexity is low, but the reception performance deteriorates due to noise amplification
Solution Approach 1:
The patent divides the reception system into multiple parallel channels (first channel and second channel with phase difference), where each channel independently processes signals through separate convolution operations with sub-filter coefficients. This segmentation allows the system to process signals through multiple paths simultaneously, improving reception performance by reducing noise amplification while maintaining manageable complexity through modular channel processing
Solution Approach 2:
The patent combines the outputs from multiple channels by generating both first and second decoded data from different channels, then using a channel selector to merge and select the optimal transmission channel based on decoded data quality. This merging approach consolidates information from multiple sources to improve overall reception reliability while using the selector mechanism to manage complexity
2Reliability
If the NFC device uses traditional channel selection methods, then the operation is simple, but the communication reliability deteriorates due to suboptimal channel choice
Solution Approach 1:
The patent implements feedback by generating decoded data from both channels and using this decoded data as feedback information for the channel selector. The channel selector receives first decoded data and second decoded data, compares their qualities, and selects the optimal transmission channel accordingly. This feedback mechanism automatically adapts channel selection based on actual signal conditions, improving communication reliability while keeping the operation automated and simple
3Reliability
If the NFC device processes signals through multiple channels with phase differences, then the reception performance improves, but the processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple channels with different phase differences and pre-preparing sub-filter coefficients for convolution operations. The system is set up in advance with the necessary processing paths and parameters, allowing rapid signal processing when communication occurs. This preliminary configuration reduces the actual processing time during operation while maintaining the benefits of multi-channel processing for improved reception performance
Data Source
AI summary
A method of operating a near field communication (NFC) device includes generating a first and a second digital signal based on an analog input signal respectively received from an external device through a first channel and a second channel having a phase difference with the first channel, generating first decoded data by decoding the first digital signal based on a plurality of first convolution result values, generating second decoded data by decoding the second digital signal based on a plurality of second convolution result values, generating first convolution result data based on the plurality of first convolution result values, generating second convolution result data based on the plurality of second convolution result values, selecting a transmission channel from among the first channel and the second channel based on the first and second decoded data, and the first and second convolution result data, and performing communication with the external device based on the transmission channel.