NFC I/Q Channel Selection Using Envelope Bit Counting
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Solution Overview
Problem
Existing NFC communication systems face challenges in accurately selecting channels due to interference, leading to loss of lock in phase-locked loops, and processing both channels increases computation and power consumption.
Innovation Solution
A method involving determining envelope signals for I-channel and Q-channel, setting reference points and demodulation thresholds, and performing bit counts to accurately select the target channel, thereby avoiding unnecessary processing of both signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phase-locked loop is used to lock one channel signal, then computation and power consumption are reduced, but channel selection accuracy deteriorates due to interference causing loss of lock
Solution Approach 1:
The patent performs preliminary actions by counting bits in both envelope signals before making the final channel selection decision. This preliminary processing of both channels allows the system to evaluate available information proactively, ensuring accurate channel selection even when interference causes phase-locked loop loss, while still maintaining energy efficiency by not continuously processing both channels throughout the entire communication process
2Measurement precision
If both channel signals are processed, then channel selection accuracy is improved, but computation and power consumption increase
Solution Approach 1:
The patent applies partial action by processing both envelope signals to count bits, which provides excessive information about both channels. This allows the system to make more accurate channel selection decisions by having redundant information, while the selective processing approach (only counting bits when needed) prevents excessive power consumption that would result from continuously processing both channels throughout the entire communication process
Data Source
AI summary
A method and apparatus for selecting a channel of an NFC signal are provided. The method includes: determining first and second envelope signals respectively according to an I-channel signal and a Q-channel signal in the NFC signal, determining a first reference point and a first demodulation threshold corresponding to the first reference point according to the first envelope signal, determining a second reference point and a second demodulation threshold corresponding to the second reference point according to the second envelope signal, determining first and second bit count values by performing first and second bits count respectively on the first and second envelope signals, and determining a target-channel signal from the I-channel signal and the Q-channel signal according to the first and second bit count values, if the first or second bit count value reaches a preset bits threshold.