US 12,332,369 B2
Radio frequency sensing using a single device based on concurrent transmit and receive
Jayanand Asok Kumar, Fremont, CA (US); Manyuan Shen, San Jose, CA (US); Xiaoxin Zhang, Sunnyvale, CA (US); Kapil Rai, Sunnyvale, CA (US); Vikram Kandukuri, Bangalore (IN); James Gardner, San Ramon, CA (US); Vincent Knowles Jones, IV, Redwood City, CA (US); Didier Johannes Richard Van Nee, Tull en 't Waal (NL); and Prasanna K. Basaralu Subramanya, Santa Clara, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Apr. 28, 2021, as Appl. No. 17/242,589.
Prior Publication US 2022/0349980 A1, Nov. 3, 2022
Int. Cl. G01S 5/02 (2010.01); H04B 17/27 (2015.01); H04J 11/00 (2006.01); H04J 13/00 (2011.01)
CPC G01S 5/0205 (2013.01) [H04B 17/27 (2015.01); H04J 11/00 (2013.01); H04J 13/0062 (2013.01)] 39 Claims
OG exemplary drawing
 
1. A method for determining a distance to an object with radio frequency sensing, comprising:
setting a receive gain of a receive channel on a wireless device to a first receive gain level;
setting a transmitter gain of a transmit channel on the wireless device to a first transmit gain level;
transmitting an at least one radio frequency (RF) signal a first number of times with a transmit channel on the wireless device, having a first antenna, wherein the at least one RF signal includes a sequence having a sequence length;
receiving a leakage signal with the receive channel, having a second antenna, at a first time, wherein the leakage signal is based on the at least one RF signal and the receive gain is set to the first receive gain level;
setting the receive gain of the receive channel to a second receive gain level, wherein the second receive gain level is greater than the first receive gain level;
receiving an at least one reflected signal with the receive channel at a second time, wherein
the at least one reflected signal is based on the at least one RF signal reflecting from an object and the receive gain is set to the second receive gain level,
setting the receive gain to the second receive gain level enables the receive channel to detect the at least one reflected signal, and
the second time is equal to at least the first time plus a transmission duration of a transmission of the sequence length of the sequence of the at least one RF signal;
determining the distance to the object based at least in part on a difference between the first time and the second time;
determining a transmitter gain increase from the at least one reflected signal; and
setting the transmitter gain of the transmit channel to a second transmit gain level;
wherein the second transmit gain level of the transmitter gain is equal to at least the first transmit gain level of the transmitter gain plus the transmitter gain increase.