Key result
An automatic RF leakage cancellation scheme achieved a vital-sign-sensing range of 4 m under a very low transmit power of -31 dBm with high accuracy against an oximeter sensor.
Why the study?
Remote vital sign detection using Doppler radar faces challenges in improving radar system sensitivity to extend the detection range.
An automatic RF leakage cancellation scheme improves the sensitivity and range of Doppler radar for remote vital sign detection.
May enable low-power contactless vital sign monitoring; leaves open clinical validation and integration.
Remote vital sign detection using Doppler radar has gained increasing interest over the years. However, challenges remain in improving radar system sensitivity to extend the detection range. In this article, we analyze noise contributions in a dual-PLL low-IF Doppler radar system and identify RF leakage/coupling as a major component of the system noise floor. This effect results in negligible SNR improvement when the transmit output power is increased beyond a certain threshold. By applying RF leakage/coupling cancellation through phase and magnitude adjustments, we demonstrate significant improvements to radar system performance. Furthermore, we propose and validate an automatic RF leakage cancellation scheme. The proposed technique is shown to achieve a vital-sign-sensing range of 4 m under a very low transmit power of −31 dBm and with a high confidence level of three beats per minute against the ground truth measured by an oximeter sensor.
No takes yet. Share an insight, caveat, or question.
Jiang et al. (2023) studied Remote vital sign detection. Automatic RF leakage cancellation scheme was evaluated on Vital-sign-sensing range and accuracy. An automatic RF leakage cancellation scheme achieved a vital-sign-sensing range of 4 m under a very low transmit power of -31 dBm with high accuracy against an oximeter sensor.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: