BPSK subcarrier demodulation using direct filters without down conversion

A test and measurement system, comprising:

• a proximity coupling device configured to transmit a wireless carrier signal;
• a proximity integrated circuit card configured to load modulate the transmitted wireless carrier signal to generate a BPSK-modulated subcarrier signal on the transmitted wireless carrier;
• and
• a test and measurement instrument including one or more processors configured to acquire the wireless carrier signal and including a BPSK subcarrier filtering demodulator configured to demodulate the BPSK-modulated subcarrier signal without performing down conversion of the wireless carrier signal.

A test and measurement system, comprising:

• a proximity coupling device configured to transmit a wireless carrier signal;
• a proximity integrated circuit card configured to load modulate the transmitted wireless carrier signal to generate a BPSK-modulated subcarrier signal on the transmitted wireless carrier;
• and
• a test and measurement instrument configured to acquire the wireless carrier signal, the test and measurement instrument including a BPSK subcarrier filtering demodulator configured to demodulate the BPSK-modulated subcarrier signal, the BPSK subcarrier filtering demodulator configured to:
• low pass filter the wireless carrier signal including the BPSK-modulated subcarrier signal to generate a low pass filtered BPSK-modulated subcarrier signal;
• detect amplitude peaks in the low pass filtered BPSK-modulated subcarrier signal;
• and
• generate a BPSK-demodulated signal in response to the detected amplitude peaks.