Precoding for non-linearity correction
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may precode communications with a precoding configured to improve non-linearity (NL). Some aspects more specifically relate to a user equipment (UE) obtaining power amplifier (PA) NL coefficients associated with NL of PAs of a network node. The UE may transmit an indication of the PA NL coefficients to the network node, which may use the indication to select precoding configured to improve reception of communications transmitted with PA NL or to improve decoding of communications transmitted using the precoding.
1. A user equipment (UE) for wireless communication, comprising:
one or more memories storing processor-readable code; and
one or more processors coupled with the one or more memories and operable to cause the UE to:
receive one or more reference signals from a network node that includes a plurality of power amplifiers (PAS) for transmissions;
transmit, to the network node, an indication of PA non-linearity (NL) coefficients associated with NL of the plurality of PAs of the network node in association with measurements of the one or more reference signals; and
receive, from the network node, one or more communications having a precoding in accordance with the indication of the PA NL coefficients, wherein the precoding is associated with data included in the one or more communications.
2. The UE of claim 1 , wherein the precoding is associated with improving a signal strength associated with a time resource having a minimum signal strength of a set of time resources associated with the one or more signals.
3. The UE of claim 1 , wherein the one or more processors are further operable to cause the UE to:
perform digital post-distortion (DPOD) correction on the one or more communications.
4. The UE of claim 3 , wherein, to cause the UE to perform DPOD correction on the one or more communications, the one or more processors are operable to cause the UE to:
perform DPOD correction with a quantity of iterations that is based at least in part on the one or more communications having precoding that is associated with the indication of the PA NL coefficients.
5. The UE of claim 1 , wherein the one or more processors are operable to cause the UE to obtain the PA NL coefficients, wherein, to cause the UE to obtain the PA NL coefficients, the one or more processors are operable to cause the UE to perform digital post-distortion (DPOD) correction on the one or more signals,
wherein the PA NL coefficients are identified in connection with the DPOD correction.
6. The UE of claim 1 , wherein the transmission of the indication of the PA NL coefficients is in association with one or more of:
establish a connection with a network node associated with transmission of the one or more communications,
receive a request for the PA NL coefficients,
detect a change in one or more of a beam, an antenna panel, or a power amplifier associated with the one or more communications, or
a time-based trigger.
7. The UE of claim 1 , wherein the PA NL coefficients are associated with precoding for additional communications with additional UEs.
8. The UE of claim 1 , wherein the one or more signals are within a time slot group, and
wherein a number of time units included within the time slot group is associated with one or more of a communication protocol, an indication from the network node, or an indication from an additional network node.
9. A network node for wireless communication, comprising:
one or more memories storing processor-readable code; and
one or more processors coupled with the one or more memories and operable to cause the network node to:
transmit one or more reference signals from a network node that includes a plurality of power amplifiers (PAs) for transmissions;
receive, from a user equipment (UE), an indication of PA non-linearity (NL) coefficients associated with NL of the plurality of PAs of the network node in association with measurements of the one or more reference signals; and
transmit, to the UE, one or more communications having a precoding in accordance with the indication of the PA NL coefficients, wherein the precoding is associated with data included in the one or more communications.
10. The network node of claim 9 , wherein the PA NL coefficients are associated with precoding for communications with multiple UEs.
11. The network node of claim 10 , wherein, to cause the network node to receive the indication of the PA NL coefficients, the one or more processors are operable to cause the network node to receive the indication of the PA NL coefficients from a proper subset of the multiple UEs.
12. The network node of claim 10 , wherein the multiple UEs are associated with a single transmission beam of the network node or a proper subset of transmission beams of the network node.
13. The network node of claim 9 , wherein, to cause the network node to receive the indication of the PA NL coefficients, the one or more processors are operable to cause the network node to:
measure the PA NL coefficients based at least in part on performance of digital pre-distortion (DPD) correction; or
receive the indication of the PA NL coefficients based at least in part on performance of digital post-distortion (DPOD) correction.
14. The network node of claim 13 , wherein the reception of the indication of the PA NL coefficients is in association with one or more of:
establish a connection with a user equipment (UE) associated with reception of the one or more communications,
transmit a request for the PA NL coefficients,
detect a change in one or more of a beam, an antenna panel, or a power amplifier associated with the one or more communications, or
a time-based trigger.
15. The network node of claim 13 , wherein the performance of DPOD correction is associated with one or more signals within a time slot group, and
wherein a number of time units included within the time slot group is associated with one or more of a communication protocol, an indication from the network node, or an indication from an additional network node.
16. The network node of claim 9 , wherein the precoding is associated with improving a signal strength associated with a time resource having a minimum signal strength of a set of time resources associated with one or more transmitted signals.
17. A method of wireless communication performed by a user equipment (UE), comprising:
receiving one or more reference signals from a network node that includes a plurality of power amplifiers (PAs) for transmissions;
transmitting, to the network node, an indication of PA non-linearity (NL) coefficients associated with NL of the plurality of PAs of the network node in association with measurements of the one or more reference signals; and
receiving, from the network node, one or more communications having a precoding in accordance with the indication of the PA NL coefficients, wherein the precoding is associated with data included in the one or more communications.
18. The method of claim 17 , wherein the precoding is associated with improving a signal strength associated with a time resource having a minimum signal strength of a set of time resources associated with the one or more signals.
19. The method of claim 17 , further comprising:
performing digital post-distortion (DPOD) correction on the one or more communications.
20. The method of claim 19 , wherein performing DPOD correction on the one or more communications comprises:
performing DPOD correction with a quantity of iterations that is based at least in part on the one or more communications having precoding that is associated with the indication of the PA NL coefficients.
21. The method of claim 17 , further comprising obtaining the PA NL coefficients, wherein obtaining the PA NL coefficients comprises performing digital post-distortion (DPOD) correction on the one or more signals,
wherein the PA NL coefficients are identified in connection with the DPOD correction.
22. The method of claim 17 , wherein transmitting the indication of the PA NL coefficients is in association with one or more of:
establishing a connection with a network node associated with transmission of the one or more communications,
receiving a request for the PA NL coefficients,
detecting a change in one or more of a beam, an antenna panel, or a power amplifier associated with the one or more communications, or
a time-based trigger.
23. The method of claim 17 , wherein the one or more signals are within a time slot group, and
wherein a number of time units included within the time slot group is associated with one or more of a communication protocol, an indication from the network node, or an indication from an additional network node.
24. A method of wireless communication performed by a network node, comprising:
transmitting one or more reference signals from a network node that includes a plurality of power amplifiers (PAs) for transmissions;
receiving, from a user equipment (UE), an indication of PA non-linearity (NL) coefficients associated with NL of the plurality of PAs of the network node in association with measurements of the one or more reference signals; and
transmitting, to the UE, one or more communications having a precoding in accordance with the PA NL coefficients, wherein the precoding is associated with data included in the one or more communications.
25. The method of claim 24 , wherein the PA NL coefficients are associated with precoding for communications with multiple UEs.
26. The method of claim 25 , wherein receiving the indication of the PA NL coefficients comprises receiving the indication of the PA NL coefficients from a proper subset of the multiple UEs.
27. The method of claim 25 , wherein the multiple UEs are associated with a single transmission beam of the network node or a proper subset of transmission beams of the network node.
28. The method of claim 24 , wherein receiving the PA NL coefficients comprises one or more of:
measuring the PA NL coefficients based at least in part on performance of digital pre-distortion (DPD) correction; or
receiving an indication of the PA NL coefficients based at least in part on performance, by a receiving device, of digital post-distortion (DPOD) correction.
29. The method of claim 26 , wherein receiving the indication of the PA NL coefficients is in association with one or more of:
establishing a connection with a user equipment (UE) associated with reception of the one or more communications,
transmitting a request for the PA NL coefficients,
detecting a change in one or more of a beam, an antenna panel, or a power amplifier associated with the one or more communications, or
a time-based trigger.
30. The method of claim 24 , wherein the performance of DPOD correction is associated with one or more signals within a time slot group, and
wherein a number of time units included within the time slot group is associated with one or more of a communication protocol, an indication from the network node, or an indication from an additional network node.