Granted Patent B2

US 12,332,369 · App. 17/242,589 · Granted Jun 17, 2025

Inventors: Jayanand Asok Kumar (Fremont, CA); Manyuan Shen (San Jose, CA); Xiaoxin Zhang (Sunnyvale, CA); Kapil Rai (Sunnyvale, CA); Vikram Kandukuri (Bangalore, IN); James Gardner (San Ramon, CA); Vincent Knowles Jones, IV (Redwood City, CA); Didier Johannes Richard Van Nee (Tull en 't Waal, NL); Prasanna K. Basaralu Subramanya (Santa Clara, CA)

Assignee: QUALCOMM Incorporated

G01S5/0205H04B17/27H04J11/00H04J13/0062

Abstract

Claims (94)

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.

2. The method of claim 1 , wherein the sequence is a predesignated sequence.

3. The method of claim 2 , wherein the predesignated sequence is a single carrier Zadoff-Chu sequence.

4. The method of claim 2 , wherein the predesignated sequence includes orthogonal frequency-division multiplexed symbols.

5. The method of claim 2 , wherein the predesignated sequence includes one or more Wi-Fi packets.

6. The method of claim 1 , further comprising transmitting a plurality of RF signals with a plurality of transmit channels.

7. The method of claim 1 , wherein receiving the at least one reflected signal includes receiving the at least one reflected signal with a plurality of receive chains.

8. The method of claim 7 , further comprising determining an angle of arrival for the at least one reflected signal.

9. The method of claim 1 , further comprising determining an angle of departure for the at least one RF signal.

10. The method of claim 1 , wherein transmitting the at least one RF signal and receiving the at least one reflected signal is performed with a single-chain transmit and receive operation.

11. An apparatus, comprising:

a memory;

at least one transceiver comprising at least one transmit chain and at least one receive chain;

at least one processor communicatively coupled to the memory and the at least one transceiver, and configured to:

set a receive gain of the at least one receive chain to a first receive gain level;

set a transmitter gain of a transmit channel on the wireless device to a first transmit gain level;

transmit an at least one radio frequency (RF) signal a first number of times with the at least one transmit chain, having a first antenna, wherein the at least one RF signal includes a sequence having a sequence length;

receive a leakage signal with the at least one receive chain, 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;

set the receive gain of the at least one receive chain to a second receive gain level, wherein the second receive gain level is greater than the first receive gain level;

receive an at least one reflected signal with the at least one receive chain 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,

the receive gain being set 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;

determine a distance to the object based at least in part on a difference between the first time and the second time;

determine a transmitter gain increase from the at least one reflected signal, and

set 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.

12. The apparatus of claim 11 , wherein the sequence is a predesignated sequence.

13. The apparatus of claim 12 , wherein the predesignated sequence is a single carrier Zadoff-Chu sequence.

14. The apparatus of claim 12 , wherein the predesignated sequence includes orthogonal frequency-division multiplexed symbols.

15. The apparatus of claim 12 , wherein the predesignated sequence includes one or more Wi-Fi packets.

16. The apparatus of claim 11 , wherein the at least one processor is further configured to transmit a plurality of RF signals with a plurality of transmit chains.

17. The apparatus of claim 11 , wherein the at least one processor is further configured to receive the at least one reflected signal with a plurality of receive chains.

18. The apparatus of claim 17 , wherein the at least one processor is further configured to determine an angle of arrival for the at least one reflected signal.

19. The apparatus of claim 11 , wherein the at least one processor is further configured to determine an angle of departure for the at least one RF signal.

20. The apparatus of claim 11 , wherein the at least one processor is configure to transmit the at least one RF signal and receive the at least one reflected signal with a single-chain transmit and receive operation.

21. An apparatus for determining a distance to an object with radio frequency sensing, comprising:

means for setting a receive gain of a receive channel on a wireless device to a first receive gain level;

means for setting a transmitter gain of a transmit channel on the wireless device to a transmit gain first level;

means for 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;

means for 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;

means for 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 of the receive channel is set to the second receive gain level,

the receive gain being set to the second receive gain level enables the receive channel to detect the at least one reflected signal;

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;

means for determining the distance to the object based at least in part on a difference between the first time and the second time;

means for determining a transmitter gain increase from the at least one reflected signal, and

means for 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.

22. The apparatus of claim 21 , wherein the sequence is a predesignated sequence.

23. The apparatus of claim 22 , wherein the predesignated sequence is a single carrier Zadoff-Chu sequence.

24. The apparatus of claim 22 , wherein the predesignated sequence includes orthogonal frequency-division multiplexed symbols.

25. The apparatus of claim 22 , wherein the predesignated sequence includes one or more Wi-Fi packets.

26. The apparatus of claim 21 , further comprising means for transmitting a plurality of RF signals with a plurality of transmit channels.

27. The apparatus of claim 21 , wherein the means for receiving the at least one reflected signal includes means for receiving the at least one reflected signal with a plurality of receive chains.

28. The apparatus of claim 27 , further comprising means for determining an angle of arrival for the at least one reflected signal.

29. The apparatus of claim 21 , further comprising means for determining an angle of departure for the at least one RF signal.

30. The apparatus of claim 21 , wherein the means for transmitting the at least one RF signal and the means for receiving the at least one reflected signal is performed with a single-chain transmit and receive operation.

31. A non-transitory processor-readable storage medium comprising processor-readable instructions to cause one or more processors to determine a distance to an object with radio frequency sensing, comprising:

code for setting a receive gain of a receive channel on a wireless device to a first receive gain level;

code for setting a transmitter gain of a transmit channel on the wireless device to a first transmit gain level;

code for 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;

code for 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 of the receive channel is set to the first receive gain level;

code for 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;

code for 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 the object and the receive gain of the receive channel is set to the second receive gain level,

the receive gain being set to 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;

code for determining the distance to the object based at least in part on a difference between the first time and the second time;

code for determining a transmitter gain increase from the at least one reflected signal, and

code for 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.

32. The non-transitory processor-readable storage medium of claim 31 , wherein the sequence is a predesignated sequence.

33. The non-transitory processor-readable storage medium of claim 32 , wherein the predesignated sequence is a single carrier Zadoff-Chu sequence.

34. The non-transitory processor-readable storage medium of claim 32 , wherein the predesignated sequence includes orthogonal frequency-division multiplexed symbols.

35. The non-transitory processor-readable storage medium of claim 32 , wherein the predesignated sequence includes one or more Wi-Fi packets.

36. The non-transitory processor-readable storage medium of claim 31 , further comprising code for transmitting a plurality of RF signals with a plurality of transmit channels.

37. The non-transitory processor-readable storage medium of claim 31 , wherein the code for receiving the at least one reflected signal includes code for receiving the at least one reflected signal with a plurality of receive chains.

38. The non-transitory processor-readable storage medium of claim 37 , further comprising code for determining an angle of arrival for the at least one reflected signal.

39. The non-transitory processor-readable storage medium of claim 31 , further comprising code for determining an angle of departure for the-at least one RF signal.

Assignments (6)

Continuity (1)

References Cited (13)