Techniques for beam-specific phase adjustment in non-co-located dual-polarized antenna arrays

1. A method for wireless communication at a first device, comprising:

communicating with a second device over a dual-polarized link using a beam pair;

reporting a rank switch to switch from the dual-polarized link to rank-one communications;

receiving, from the second device and based on reporting the rank switch, a first reference signal transmitted using a first set of antenna elements over a first polarization and

a second reference signal transmitted using a second set of antenna elements over a second polarization; and

transmitting, to the second device, an indication of an inter-polarization phase adjustment to be applied to signals transmitted from the first set of antenna elements or the second set of antenna elements, wherein the inter-polarization phase adjustment is based on a phase difference between the first reference signal and the second reference signal.

2. The method of claim 1 , further comprising receiving, based on reporting the rank switch to the second device, a configuration indicating different polarization transmission configurations for the first reference signal and the second reference signal.

3. The method of claim 2 , wherein receiving the first reference signal is based on a first beam indicated in the configuration and receiving the second reference signal is based on a second beam indicated in the configuration.

4. The method of claim 1 , wherein reporting the rank switch includes reporting the rank switch to the second device in channel state feedback.

5. The method of claim 1 , wherein the inter-polarization phase adjustment is based on a phase difference between a first phase of the first reference signal relative to a second phase of the second reference signal.

6. The method of claim 1 , wherein receiving the first reference signal includes receiving the first reference signal at the first polarization of the first set of antenna elements at the first device, wherein receiving the second reference signal includes receiving the second reference signal at the second polarization of the second set of antenna elements at the first device, wherein the inter-polarization phase adjustment is based on a first phase of the first reference signal as received at the first polarization of the first set of antenna elements and a second phase of the second reference signal as received at the second polarization of the second set of antenna elements.

7. The method of claim 1 , wherein the inter-polarization phase adjustment compensates for path distance differences between the first reference signal being based on the first polarization and the second reference signal being based on the second polarization.

8. The method of claim 7 , wherein the path distance differences correspond to a beam angle difference between the first reference signal being transmitted using the first set of antenna elements and the second reference signal being transmitted using the second set of antenna elements.

9. The method of claim 8 , wherein the path distance differences further corresponds to a relative mobility direction of at least one of the first device or a reflector with respect to the second device.

10. A method for wireless communication at a first device, comprising:

communicating with a second device over a dual-polarized link using a beam pair;

receiving, from the second device, a reporting of a rank switch to switch from the dual-polarized link to a rank-one communications;

transmitting, to the second device and based on receiving the reporting of the rank switch, a first reference signal using a first set of antenna elements of the first device over a first polarization and

a second reference signal using a second set of antenna elements of the first device over a second polarization;

receiving, from the second device, an indication of an inter-polarization phase adjustment that is based on a phase difference between the first reference signal and the second reference signal; and

applying, to at least one of the first set of antenna elements or the second set of antenna elements, the inter-polarization phase adjustment for communicating with the second device.

11. The method of claim 10 , further comprising transmitting, based on receiving the reporting of the rank switch, a configuration indicating different polarization transmission configuration for the first reference signal and the second reference signal.

12. The method of claim 11 , wherein transmitting the first reference signal is based on a first beam indicated in the configuration and transmitting the second reference signal is based on a second beam indicated in the configuration.

13. The method of claim 10 , wherein the inter-polarization phase adjustment compensates for path distance differences between the first reference signal being based on the first polarization and the second reference signal being based on the second polarization.

14. The method of claim 13 , wherein the path distance differences correspond to a beam angle difference between the first reference signal being transmitted using the first set of antenna elements and the second reference signal being transmitted using the second set of antenna elements.

15. The method of claim 14 , wherein the path distance differences further corresponds to a relative mobility direction of at least one of the second device or a reflector with respect to the first device.

16. The method of claim 10 , further comprising, based on detecting at least one of a beam pair switch, movement of the second device, or change in a channel environment parameter:

transmitting, to the second device, a third reference signal using the first set of antenna elements of the first device over the first polarization;

transmitting, to the second device, a fourth reference signal using the second set of antenna elements of the first device over the second polarization;

receiving, from the second device, a second inter-polarization phase adjustment; and

applying, to at least one of the first set of antenna elements or the second set of antenna elements, the second inter-polarization phase adjustment for communicating with the second device.

17. An apparatus for wireless communication, comprising:

a transceiver;

a memory configured to store instructions; and

one or more processors communicatively coupled with the memory and the transceiver, wherein the one or more processors are configured to:

communicate with a device over a dual-polarized link using a beam pair;

report a rank switch to switch from the dual-polarized link to rank-one communications;

receive, from the device and based on reporting the rank switch, a first reference signal transmitted using a first set of antenna elements over a first polarization and

a second reference signal transmitted using a second set of antenna elements over a second polarization; and

transmit, to the device, an indication of an inter-polarization phase adjustment to be applied to signals transmitted from the first set of antenna elements or the second set of antenna elements, wherein the inter-polarization phase adjustment is based on a phase difference between the first reference signal and the second reference signal.

18. The apparatus of claim 17 , wherein the one or more processors are further configured to receive, based on reporting the rank switch to the device, a configuration indicating different polarization transmission configurations for the first reference signal and the second reference signal.

19. The apparatus of claim 18 , wherein the one or more processors are configured to receive the first reference signal based on a first beam indicated in the configuration and receive the second reference signal based on a second beam indicated in the configuration.

20. The apparatus of claim 17 , wherein the one or more processors are configured to report the rank switch at least in part by reporting the rank switch to the device in channel state feedback.

21. The apparatus of claim 17 , wherein the inter-polarization phase adjustment is based on a phase difference between a first phase of the first reference signal relative to a second phase of the second reference signal.

22. The apparatus of claim 17 , wherein the one or more processors are configured to receive the first reference signal at least in part by receiving the first reference signal at the first polarization of the first set of antenna elements at the apparatus, wherein the one or more processors are configured to receive the second reference signal at least in part by receiving the second reference signal at the second polarization of the second set of antenna elements at the apparatus, wherein the inter-polarization phase adjustment is based on a first phase of the first reference signal as received at the first polarization of the first set of antenna elements and a second phase of the second reference signal as received at the second polarization of the second set of antenna elements.

23. The apparatus of claim 17 , wherein the inter-polarization phase adjustment compensates for path distance differences between the first reference signal being based on the first polarization and the second reference signal being based on the second polarization.

24. The apparatus of claim 23 , wherein the path distance differences correspond to a beam angle difference between the first reference signal being transmitted using the first set of antenna elements and the second reference signal being transmitted using the second set of antenna elements.

25. The apparatus of claim 24 , wherein the path distance differences further corresponds to a relative mobility direction of at least one of the apparatus or a reflector with respect to the device.

26. An apparatus for wireless communication, comprising:

a transceiver;

a memory configured to store instructions; and

one or more processors communicatively coupled with the memory and the transceiver, wherein the one or more processors are configured to:

communicate with a device over a dual-polarized link using a beam pair;

receive, from the device, a reporting of a rank switch to switch from the dual-polarized link to a rank-one communications;

transmit, to the device and based on receiving the reporting of the rank switch, a first reference signal using a first set of antenna elements of the apparatus over a first polarization and

a second reference signal using a second set of antenna elements of the apparatus over a second polarization;

receive, from the device, an indication of an inter-polarization phase adjustment that is based on a phase difference between the first reference signal and the second reference signal; and

apply, to at least one of the first set of antenna elements or the second set of antenna elements, the inter-polarization phase adjustment for communicating with the device.

27. The apparatus of claim 26 , wherein the one or more processors are further configured to transmit, based on receiving the reporting of the rank switch, a configuration indicating different polarization transmission configuration for the first reference signal and the second reference signal.

28. The apparatus of claim 27 , wherein the one or more processors are configured to transmit the first reference signal based on a first beam indicated in the configuration and transmit the second reference signal based on a second beam indicated in the configuration.

29. The apparatus of claim 26 , wherein the inter-polarization phase adjustment compensates for path distance differences between the first reference signal being based on the first polarization and the second reference signal being based on the second polarization.

30. The apparatus of claim 29 , wherein the path distance differences correspond to a beam angle difference between the first reference signal being transmitted using the first set of antenna elements and the second reference signal being transmitted using the second set of antenna elements.