LOW IF ARCHITECTURES FOR NONCONTACT VITAL SIGN DETECTION
First Claim
1. A transceiver system, comprising:
- transmit circuitry configured to transmit a modulated signal at a target, the modulated signal generated by modulating a local oscillator (LO) signal with an intermediate frequency (IF) carrier;
receive circuitry configured to generate an IF signal by down converting a received signal with the LO signal, the received signal comprising backscatter of the modulated signal from the target;
an analog-to-digital converter (ADC) configured to simultaneously sample the IF carrier and the IF signal; and
processing circuitry configured to determine a vibration frequency of the target by demodulating the sampled IF signal with the sampled IF carrier.
1 Assignment
0 Petitions
Accused Products
Abstract
Various examples of methods and systems are provided for vibrational frequency detection (e.g., noncontact vital sign detection) using digitally assisted low intermediate frequency (IF) architectures. In one example, a transceiver system is configured to transmit a modulated signal generated by modulating a local oscillator (LO) signal with an IF carrier; generate an IF signal by down converting a received signal comprising backscatter with the LO signal; and simultaneously sample the IF carrier and the IF signal. A vibration frequency can be determined by demodulating the sampled IF signal with the sampled IF carrier. In another example, a method includes generating and transmitting a modulated signal; receiving backscatter of the modulated signal; generating an IF signal by down converting the received signal with the LO signal; simultaneously sampling the IF carrier and the IF signal; and determining a vibration frequency by demodulating the sampled IF signal with the sampled IF carrier.
9 Citations
20 Claims
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1. A transceiver system, comprising:
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transmit circuitry configured to transmit a modulated signal at a target, the modulated signal generated by modulating a local oscillator (LO) signal with an intermediate frequency (IF) carrier; receive circuitry configured to generate an IF signal by down converting a received signal with the LO signal, the received signal comprising backscatter of the modulated signal from the target; an analog-to-digital converter (ADC) configured to simultaneously sample the IF carrier and the IF signal; and processing circuitry configured to determine a vibration frequency of the target by demodulating the sampled IF signal with the sampled IF carrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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generating a modulated signal by modulating a local oscillator (LO) signal with an intermediate frequency (IF) carrier; transmitting the modulated signal at a target; receiving a received signal comprising backscatter of the modulated signal from the target; generating an IF signal by down converting the received signal with the LO signal; generating a sampled IF signal and a sampled IF carrier by simultaneously sampling the IF carrier and the IF signal; and determining a vibration frequency of the target by demodulating the sampled IF signal with the sampled IF carrier. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification