Joint communication-ranging channel estimation in sidelink

1. An apparatus at a first wireless communication device, comprising:

one or more transceivers;

one or more ranging devices;

one or more memories; and

one or more processors coupled to the one or more transceivers, the one or more ranging devices, and the one or more memories, wherein the one or more processors are configured to:

transmit a sidelink message to a second wireless communication device via a bistatic communication channel between the first wireless communication device and the second wireless communication device via the one or more transceivers;

receive bistatic communication channel feedback from the second wireless communication device via the one or more transceivers, the bistatic communication channel feedback being generated by the second wireless communication device based on the sidelink message, wherein the bistatic communication channel feedback comprises at least one of a set of initial autocorrelation samples of a plurality of autocorrelation samples or a power spectral density of the bistatic communication channel;

transmit a ranging signal via the one or more ranging devices;

receive reflected ranging signals based on the ranging signal via the one or more ranging devices to obtain a monostatic ranging channel estimate; and

transmit a sidelink transmission to the second wireless communication device via the one or more transceivers using at least one of a transmit power or a beamforming parameter selected based on joint communication-ranging side information, wherein the joint communication-ranging side information is based on the bistatic communication channel feedback and the monostatic ranging channel estimate.

2. The apparatus of claim 1 , wherein the one or more processors are further configured to:

obtain a communication channel Doppler profile based on the bistatic communication channel feedback; and

estimate the monostatic ranging channel estimate based on the reflected ranging signals, wherein the monostatic ranging channel estimate comprises a ranging channel Doppler and angular profile.

3. The apparatus of claim 2 , wherein the one or more processors are further configured to:

associate and correlate the communication channel Doppler profile with the ranging channel Doppler and angular profile to obtain the joint communication-ranging side information.

4. The apparatus of claim 1 , wherein the one or more processors are further configured to:

transmit an additional ranging signal;

receive additional reflected ranging signals based on the additional ranging signal; and

obtain a new monostatic ranging channel estimate based on the additional reflected ranging signals and the joint communication-ranging side information.

5. The apparatus of claim 1 , wherein the one or more processors are further configured to:

select a transmit beam comprising the beamforming parameter for the sidelink transmission based on the joint communication-ranging side information.

6. The apparatus of claim 5 , wherein the transmit beam comprises a narrow beam width in response to the joint communication-ranging side information indicating a line-of-sight communication link between the first wireless communication device and the second wireless communication device.

7. The apparatus of claim 5 , wherein the transmit beam comprises a beam direction directed towards a target for reflection of the sidelink transmission in response to the joint communication-ranging side information indicating a non-line-of-sight communication link between the first wireless communication device and the second wireless communication device.

8. A method for wireless communication at a first wireless communication device configured for wireless communication, the method comprising:

transmitting a sidelink message to a second wireless communication device via a bistatic communication channel between the first wireless communication device and the second wireless communication device;

receiving bistatic communication channel feedback from the second wireless communication device, the bistatic communication channel feedback being generated by the second wireless communication device based on the sidelink message, wherein the bistatic communication channel feedback comprises at least one of a set of initial autocorrelation samples of a plurality of autocorrelation samples or a power spectral density of the bistatic communication channel;

transmitting a ranging signal;

receiving reflected ranging signals based on the ranging signal to obtain a monostatic ranging channel estimate; and

transmitting a sidelink transmission to the second wireless communication device using at least one of a transmit power or a beamforming parameter selected based on joint communication-ranging side information, wherein the joint communication-ranging side information is based on the bistatic communication channel feedback and the monostatic ranging channel estimate.

9. The method of claim 8 , further comprising:

obtaining a communication channel Doppler profile based on the bistatic communication channel feedback; and

estimating the monostatic ranging channel estimate based on the reflected ranging signals, wherein the monostatic ranging channel estimate comprises a ranging channel Doppler and angular profile.

10. The method of claim 9 , further comprising:

associating and correlating the communication channel Doppler profile with the ranging channel Doppler and angular profile to obtain the joint communication-ranging side information.

11. The method of claim 8 , further comprising:

transmitting an additional ranging signal;

receiving additional reflected ranging signals based on the additional ranging signal; and

obtaining a new monostatic ranging channel estimate based on the additional reflected ranging signals and the joint communication-ranging side information.

12. The method of claim 8 , further comprising:

selecting a transmit beam comprising the beamforming parameter for the sidelink transmission based on the joint communication-ranging side information.

13. The method of claim 12 , wherein the transmit beam comprises a narrow beam width in response to the joint communication-ranging side information indicating a line-of-sight communication link between the first wireless communication device and the second wireless communication device.

14. The method of claim 12 , wherein the transmit beam comprises a beam direction directed towards a target for reflection of the sidelink transmission in response to the joint communication-ranging side information indicating a non-line-of-sight communication link between the first wireless communication device and the second wireless communication device.

15. A first wireless communication device configured for wireless communication, comprising:

means for transmitting a sidelink message to a second wireless communication device via a bistatic communication channel between the first wireless communication device and the second wireless communication device;

means for receiving bistatic communication channel feedback from the second wireless communication device, the bistatic communication channel feedback being generated by the second wireless communication device based on the sidelink message, wherein the bistatic communication channel feedback comprises at least one of a set of initial autocorrelation samples of a plurality of autocorrelation samples or a power spectral density of the bistatic communication channel;

means for transmitting a ranging signal;

means for receiving reflected ranging signals based on the ranging signal to obtain a monostatic ranging channel estimate; and

means for transmitting a sidelink transmission to the second wireless communication device using at least one of a transmit power or a beamforming parameter selected based on joint communication-ranging side information, wherein the joint communication-ranging side information is based on the bistatic communication channel feedback and the monostatic ranging channel estimate.

16. The first wireless communication device of claim 15 , further comprising:

means for obtaining a communication channel Doppler profile based on the bistatic communication channel feedback; and

means for estimating the monostatic ranging channel estimate based on the reflected ranging signals, wherein the monostatic ranging channel estimate comprises a ranging channel Doppler and angular profile.

17. The first wireless communication device of claim 16 , further comprising:

means for associating and correlating the communication channel Doppler profile with the ranging channel Doppler and angular profile to obtain the joint communication-ranging side information.

18. The first wireless communication device of claim 15 , further comprising:

means for transmitting an additional ranging signal;

means for receiving additional reflected ranging signals based on the additional ranging signal; and

means for obtaining a new monostatic ranging channel estimate based on the additional reflected ranging signals and the joint communication-ranging side information.

19. The first wireless communication device of claim 15 , further comprising:

means for selecting a transmit beam comprising the beamforming parameter for the sidelink transmission based on the joint communication-ranging side information.

20. The first wireless communication device of claim 19 , wherein the transmit beam comprises a narrow beam width in response to the joint communication-ranging side information indicating a line-of-sight communication link between the first wireless communication device and the second wireless communication device.

21. The first wireless communication device of claim 19 , wherein the transmit beam comprises a beam direction directed towards a target for reflection of the sidelink transmission in response to the joint communication-ranging side information indicating a non-line-of-sight communication link between the first wireless communication device and the second wireless communication device.

22. A non-transitory computer-readable medium having stored therein instructions executable by one or more processors of a first wireless communication device to:

transmit a sidelink message to a second wireless communication device via a bistatic communication channel between the first wireless communication device and the second wireless communication device;

receive bistatic communication channel feedback from the second wireless communication device, the bistatic communication channel feedback being generated by the second wireless communication device based on the sidelink message, wherein the bistatic communication channel feedback comprises at least one of a set of initial autocorrelation samples of a plurality of autocorrelation samples or a power spectral density of the bistatic communication channel;

transmit a ranging signal;

receive reflected ranging signals based on the ranging signal to obtain a monostatic ranging channel estimate; and

transmit a sidelink transmission to the second wireless communication device using at least one of a transmit power or a beamforming parameter selected based on joint communication-ranging side information, wherein the joint communication-ranging side information is based on the bistatic communication channel feedback and the monostatic ranging channel estimate.

23. The non-transitory computer-readable medium of claim 22 , further comprising instructions executable by the one or more processors of the first wireless communication device to:

obtain a communication channel Doppler profile based on the bistatic communication channel feedback;

estimate the monostatic ranging channel estimate based on the reflected ranging signals, wherein the monostatic ranging channel estimate comprises a ranging channel Doppler and angular profile; and

associate and correlate the communication channel Doppler profile with the ranging channel Doppler and angular profile to obtain the joint communication-ranging side information.

24. The non-transitory computer-readable medium of claim 22 , further comprising instructions executable by the one or more processors of the first wireless communication device to:

select a transmit beam comprising the beamforming parameter for the sidelink transmission based on the joint communication-ranging side information.