US 12,392,881 B2
System and method for detecting proximity of users
Anders Sven Mattsson, San Diego, CA (US); Gennady Feygin, San Diego, CA (US); and Pranav Dayal, San Diego, CA (US)
Assigned to Samsung Electronics Co., Ltd., Yongin-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Jul. 2, 2020, as Appl. No. 16/920,289.
Claims priority of provisional application 62/971,830, filed on Feb. 7, 2020.
Claims priority of provisional application 62/970,683, filed on Feb. 5, 2020.
Prior Publication US 2021/0239819 A1, Aug. 5, 2021
Int. Cl. G01S 13/04 (2006.01); G01S 7/03 (2006.01)
CPC G01S 13/04 (2013.01) [G01S 7/03 (2013.01); G01S 7/038 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for detecting proximity of a user within a particular distance of a radio device, the method comprising:
transmitting a transmitted signal, via a transmitter and an antenna of the radio device, to engage in radio communication with another communication device;
receiving a received signal via a receiver of the radio device, wherein the received signal includes a leaked portion of the transmitted signal and signal reflected from the user;
processing the received signal;
determining, based on the processing of the received signal, that the received signal is below a minimum threshold power;
in response to determining that the received signal is below the minimum threshold power, detecting that the user is in proximity of the radio device;
determining a first value and a second value corresponding to respectively a first signal reflected from the user at a first time, and a second signal reflected from the user at a second time, wherein the first value and the second value include signal power levels;
identifying a variation of the first value from the second value; and
determining that the user is in proximity of the radio device in response to identifying the variation; and
reducing power of the radio device in response to detecting that the user is in proximity of the radio device.