US 12,313,772 B2
Joint estimation of respiratory and heart rates using ultra-wideband radar
Hoang Viet Nguyen, Plano, TX (US); Raghunandan M. Rao, Allen, TX (US); Yuming Zhu, Plano, TX (US); Yi Yang, Suwon-si (KR); and Jiho Shin, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on May 19, 2022, as Appl. No. 17/664,200.
Claims priority of provisional application 63/302,734, filed on Jan. 25, 2022.
Claims priority of provisional application 63/191,638, filed on May 21, 2021.
Prior Publication US 2022/0373646 A1, Nov. 24, 2022
Int. Cl. G01S 7/41 (2006.01); A61B 5/0205 (2006.01); G01S 13/88 (2006.01)
CPC G01S 7/414 (2013.01) [A61B 5/0205 (2013.01); G01S 13/88 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electronic device for contactless vital sign monitoring, the electronic device comprising:
a transceiver; and
a processor operably connected to the transceiver, the processor configured to:
transmit, via the transceiver, radar signals for object detection;
generate a clutter removed channel impulse response (CIR) from received reflections of the radar signals, a portion of which are reflected off of a living object;
identify a set of range bins corresponding to a position of the living object based in part on the clutter removed CIR, wherein the portion of the clutter removed CIR includes a set of non-stationary signals that respectively correspond to each range bin among the set of range bins; and
identify a first set of signal components representing a respiration rate of the living object and a second set of signal components representing a heart rate of the living object,
wherein to identify the first set of signal components and the second set of signal components, the processor is further configured to:
in a first operation, identify the first set of signal components and the second set of signal components using variational mode decomposition (VMD) that decomposes each non-stationary signal of the set of non-stationary signals into subcomponents representing the respiration rate and the heart rate, or
in a second operation, identify the first set of signal components from a generated frequency spectrum and identify the second set of signal components based on properties of a generated power spectrum density using the set of range bins; and
wherein to use the VMD that decomposes each non-stationary signal into subcomponents representing the respiration rate and the heart rate, the processor is further configured to:
decompose, using VMD, a real part of each non-stationary signal into multiple narrow band components, wherein each of the narrow band components is centered around a respective frequency; and
decompose, using VMD, an imaginary part of each non-stationary signal into the multiple narrow band components centered around the respective frequencies.