Wireless Signal Phase Capture Using Dynamic Counter Timing
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately capturing the phase of distorted wireless signals, which affects data value determination in BPSK and OOK schemes used in wireless IC cards, due to changes in signal periods and duty ratios.
Innovation Solution
A wireless communication apparatus employing a counter that updates count values at a frequency higher than the signal frequency, with dynamic phase capture value settings based on reset timings to ensure accurate phase capture, even in distorted signals, by adjusting the phase capture value in response to edge and overflow resets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a counter operates at the same frequency as the wireless signal, then the device complexity is reduced, but the phase capture accuracy deteriorates when signal distortion occurs
Solution Approach 1:
The counter operates at a higher frequency than the wireless signal, performing preliminary counting actions at multiple points within each signal period. This allows the system to pre-establish multiple potential phase capture points, from which the most accurate phase information can be selected, thereby improving phase capture accuracy while managing device complexity through systematic multi-point sampling.
2Reliability
If phase capture value is fixed, then the device complexity is reduced, but the reliability of phase capture deteriorates under distorted signal conditions
Solution Approach 1:
The phase capture value is dynamically adjusted based on the actual signal period detected. When signal distortion causes period variations, the phase capture value is automatically updated to maintain accurate phase alignment. This dynamic adaptation ensures reliable phase capture under varying signal conditions while managing complexity through algorithmic adjustment rather than hardware reconfiguration.
Solution Approach 2:
The system continuously monitors the wireless signal characteristics and uses this feedback to adjust the phase capture value. By comparing the actual signal period with expected values and adjusting the phase capture timing accordingly, the system maintains high reliability in phase capture even when signal distortion occurs, creating a closed-loop control mechanism that adapts to changing conditions.
Data Source
AI summary
A wireless communication apparatus receives a wireless signal whose phases represent data values and determines the data values represented in the phases of the wireless signal. The apparatus includes a counter that updates a count value at a frequency higher than a frequency of the wireless signal, and resets the count value to an initial value when the phase of the wireless signal changes or when the counter overflows, a capture timing setting unit that sets a phase capture value in response to a resetting of the count value, and a phase capturing unit that captures the phase of the wireless signal when the count value reaches the phase capture value.