System for multistatic radar communication

Patent metadata

Field	Value
Publication number	US-12174286-B2
Application number	US-202217694893-A
Country	US
Kind code	B2
Filing date	Mar 15, 2022
Priority date	May 11, 2020
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for multistatic radar communications. In one aspect, a wireless communication device may determine a distance and direction of one or more receiving devices. The wireless communication device may transmit, to the one or more receiving devices, timing information indicating a timing relationship between a codeword sequence and one or more pulses. The wireless communication device may transmit a respective codeword of the codeword sequence in the direction of each of the one or more receiving devices. The wireless communication device may further transmit the one or more pulses in a plurality of directions. The wireless communication device may receive feedback from at least one of the one or more receiving devices and determine ranging information about an object based on the feedback and the distance or direction of at least one receiving device.

First claim

What is claimed is:

1. A method for wireless communication performed by a wireless communication device, comprising:
transmitting, to one or more receiving devices, timing information indicating a timing relationship between a codeword sequence and one or more pulses;
transmitting a respective codeword of the codeword sequence, using beamforming, in a direction of each of the one or more receiving devices;
transmitting the one or more pulses, using beamforming, in a plurality of directions, the one or more pulses being transmitted in a first radar frame; and
receiving, from at least one of the one or more receiving devices, feedback associated with at least one object along a path of a first pulse of the one or more pulses transmitted in the first radar frame, the feedback indicating a relationship between the first pulse and an echo of the first pulse received by the at least one receiving device, the echo representing a reflection of the first pulse by the at least one object.

2. The method of claim 1 , wherein the feedback indicates a channel impulse response (CIR) associated with the echo and a delay between the transmission of the first pulse and a measuring of the CIR by the at least one receiving device.

3. The method of claim 2 , further comprising:
determining a velocity of the at least one object associated with the CIR and the delay between the transmission of the first pulse and the measuring of the CIR by the at least one receiving device.

4. The method of claim 1 , further comprising:
exchanging, with the one or more receiving devices, one or more frames associated with a session setup operation, the one or more frames indicating a distance and direction of each of the one or more receiving devices; and
determining at least one of a distance, direction, or velocity of the at least one object associated with the received feedback and the distance or direction of the at least one receiving device from which the feedback is received.

5. The method of claim 4 , further comprising:
transmitting, to the one or more receiving devices, one or more radar alert frames preceding the codeword sequence, each of the one or more radar alert frames being transmitted in the direction of a respective one of the receiving devices and indicating an address of the respective receiving device and an address to which the feedback is to be sent.

6. The method of claim 1 , wherein the transmitting of the one or more pulses comprises:
changing an antenna configuration of the wireless communication device to transmit the one or more pulses in the plurality of directions, each of the antenna configurations being associated with a respective one of the plurality of directions.

7. The method of claim 1 , wherein the feedback indicates at least one of an azimuth or an elevation associated with an angle of arrival (AOA) of the echo in relation to the at least one receiving device.

8. The method of claim 1 , wherein the feedback indicates a delay between the transmission of the first pulse and the reception of the echo by the at least one receiving device.

9. The method of claim 1 , wherein the feedback indicates a distance or Doppler shift measured by the at least one receiving device in relation to the at least one object.

10. The method of claim 1 , further comprising:
retransmitting the one or more pulses, using beamforming, in the plurality of directions, the one or more pulses being retransmitted in a second radar frame;
receiving, from the at least one receiving device, additional feedback associated with the one or more pulses retransmitted in the second radar frame; and
determining a velocity of the at least one object associated with the feedback received responsive to the first radar frame and the additional feedback received responsive to the second radar frame.

11. A wireless communication device comprising:
one or more processors; and
a memory storing instructions that, when executed by the one or more processors, cause the wireless communication device to:
transmit, to one or more receiving devices, timing information indicating a timing relationship between a codeword sequence and one or more pulses;
transmit a respective codeword of the codeword sequence, using beamforming, in a direction of each of the one or more receiving devices;
transmit the one or more pulses, using beamforming, in a plurality of directions, the one or more pulses being transmitted in a first radar frame; and
receive, from at least one of the one or more receiving devices, feedback associated with at least one object along a path of a first pulse of the one or more pulses transmitted in the first radar frame, the feedback indicating a relationship between the first pulse and an echo of the first pulse received by the at least one receiving device, the echo representing a reflection of the first pulse by the at least one object.

12. The wireless communication device of claim 11 , wherein the feedback indicates a channel impulse response (CIR) associated with the echo and a delay between the transmission of the first pulse and a measuring of the CIR by the at least one receiving device, execution of the instructions further causing the wireless communication device to:
determine a velocity of the at least one object associated with the CIR and the delay between the transmission of the first pulse and the measuring of the CIR by the at least one receiving device.

13. The wireless communication device of claim 11 , wherein execution of the instructions further causes the wireless communication device to:
exchange, with the one or more receiving devices, one or more frames associated with a session setup operation, the one or more frames indicating a distance and direction of each of the one or more receiving devices; and
determine at least one of a distance, direction, or velocity of the at least one object associated with the received feedback and the distance or direction of the at least one receiving device from which the feedback is received.

14. The wireless communication device of claim 11 , wherein execution of the instructions further causes the wireless communication device to:
transmit, to the one or more receiving devices, one or more radar alert frames preceding the codeword sequence, each of the one or more radar alert frames being transmitted in the direction of a respective one of the receiving devices and indicating an address of the respective receiving device and an address to which the feedback is to be sent.

15. The wireless communication device of claim 11 , wherein execution of the instructions further causes the wireless communication device to:
retransmit the one or more pulses, using beamforming, in the plurality of directions, the one or more pulses being retransmitted in a second radar frame;
receive, from the at least one receiving device, additional feedback associated with the one or more pulses retransmitted in the second radar frame; and
determine a velocity of the at least one object associated with the feedback received responsive to the first radar frame and the additional feedback received responsive to the second radar frame.

16. A method of wireless communication performed by a wireless communication device, comprising:
receiving, from a transmitting device, timing information indicating a timing relationship between a codeword sequence and one or more pulses;
receiving, at a first time, a first codeword of the codeword sequence in a first radar frame transmitted by the transmitting device;
receiving, at a second time, an echo of a first pulse of the one or

Assignees

• Qualcomm Inc

Inventors

• Trainin Solomon
• Eitan Alecsander Petru
• Kasher Assaf

Classifications

• G01S7/292

  Extracting wanted echo-signals · CPC title

• G01S7/282

  Transmitters · CPC title

• G01S13/505

  using Doppler effect for determining closest range to a target or corresponding time, e.g. miss-distance indicator · CPC title

• G01S7/006

  using shared front-end circuitry, e.g. antennas (G01S13/765, G01S13/825 take precedence) · CPC title

• G01S13/10

  using transmission of interrupted, pulse modulated waves (determination of distance by phase measurement G01S13/32) · CPC title