BPSK Subcarrier Demodulation Without Down Conversion
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Solution Overview
Problem
Existing demodulation techniques for BPSK-modulated signals in NFC devices are computationally intensive and difficult to implement in test and measurement instruments due to the need for phase synchronization of carrier signals, which can lead to distortion and errors.
Innovation Solution
A method and system for demodulating BPSK-modulated signals using low pass filtering to detect amplitude peaks without performing down conversion, eliminating the need for a replica carrier signal and reducing computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If down conversion with replica carrier signal is used for BPSK demodulation, then demodulation accuracy can be maintained, but computational complexity increases and phase synchronization errors occur
Solution Approach 1:
The patent extracts and eliminates the replica carrier signal generation and down conversion steps from the traditional BPSK demodulation process. By directly filtering the modulated signal to detect amplitude peaks, the system removes the computationally intensive components while maintaining demodulation functionality.
Solution Approach 2:
Instead of using the conventional approach of down converting the signal to baseband first, the patent inverts the process by directly filtering the bandpass signal and detecting amplitude peaks in the time domain, thereby avoiding the need for replica carrier signals and complex phase synchronization.
2Ease of operation
If replica carrier signal is used for down conversion, then demodulation can be performed, but phase synchronization requirements increase system complexity
Solution Approach 1:
The system uses the signal itself to generate the filtering response without requiring an external replica carrier signal. The bandpass filter directly processes the received modulated signal, and amplitude peaks are detected from the filtered output, making the system self-sufficient and eliminating synchronization requirements.
3Measurement precision
If phase synchronization techniques are implemented, then demodulation accuracy is maintained, but computational resources are excessively consumed
Solution Approach 1:
The patent replaces expensive, computationally intensive phase synchronization algorithms with a simple, low-cost filtering and peak detection approach. The bandpass filter and amplitude peak detector are computationally inexpensive operations that can be implemented efficiently in resource-constrained environments.
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 enables efficient demodulation of BPSK signals in NFC devices by detecting phase transitions directly, reducing computational requirements and minimizing errors caused by frequency or phase mismatches, while maintaining accuracy and speed.
Implementation Method 1
low pass filtering the BPSK-modulated signal to generate a low pass filtered BPSK-modulated signal
Data Source
AI summary
A test and measurement system includes a proximity coupling device to transmit a wireless carrier signal and a proximity integrated circuit card to load modulate the transmitted wireless carrier signal to generate a BPSK-modulated subcarrier signal on the transmitted wireless carrier. A test and measurement instrument acquires the wireless carrier signal and includes a BPSK subcarrier filtering demodulator to demodulate the carrier signal including the BPSK-modulated subcarrier signal without performing down conversion of the wireless carrier signal. The BPSK subcarrier filtering demodulator low pass filters the wireless carrier signal including the BPSK-modulated subcarrier signal to generate a low pass filtered BPSK-modulated subcarrier signal and detects amplitude peaks in the low pass filtered BPSK-modulated subcarrier signal. The BPSK subcarrier filtering demodulator generates a BPSK-demodulated signal in response to the detected amplitude peaks.