Techniques for transmitting digital pre-distortion information
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network entity, a reference signal. The UE may transmit, to the network entity and via a feedback channel, digital pre-distortion (DPD) information that is based at least in part on the reference signal, wherein the DPD information indicates an estimate of non-linearities of a power amplifier at the network entity based at least in part on the reference signal. Numerous other aspects are described.
1 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a network entity, a reference signal; and
transmitting, to the network entity and via a feedback channel, digital pre-distortion (DPD) information that is based at least in part on the reference signal, wherein the DPD information indicates an estimate of non-linearities of a power amplifier at the network entity based at least in part on the reference signal.
2 . The method of claim 1 , wherein transmitting the DPD information comprises transmitting uplink control information via a physical uplink shared channel that indicates the DPD information.
3 . The method of claim 1 , wherein transmitting the DPD information comprises transmitting uplink control information via a physical uplink control channel that indicates the DPD information.
4 . The method of claim 1 , further comprising:
determining the DPD information based at least in part on the reference signal, wherein the reference signal is a training signal for determining the DPD information.
5 . The method of claim 1 , wherein the DPD information is transmitted in a periodic manner or in an aperiodic manner.
6 . The method of claim 1 , wherein the DPD information is transmitted in a semi-persistent manner.
7 . The method of claim 1 , wherein the reference signal is a channel state information reference signal (CSI-RS).
8 . The method of claim 1 , wherein the DPD information indicates a formula used for determining the estimate of the non-linearities of the power amplifier based at least in part on the reference signal.
9 . The method of claim 1 , further comprising:
transmitting, to the network entity, capability signaling that indicates the UE is capable of determining the DPD information based at least in part on the reference signal.
10 . The method of claim 1 , wherein the UE is associated with a beam of interest for a DPD calculation by the network entity.
11 . A method of wireless communication performed by a network entity, comprising:
transmitting, to a user equipment (UE), a reference signal; and
receiving, from the UE and via a feedback channel, digital pre-distortion (DPD) information that is based at least in part on the reference signal, wherein the DPD information indicates an estimate of non-linearities of a power amplifier at the network entity based at least in part on the reference signal.
12 . The method of claim 11 , further comprising:
performing DPD to a signal provided to the power amplifier based at least in part on the DPD information.
13 . The method of claim 11 , wherein receiving the DPD information comprises receiving uplink control information via a physical uplink shared channel that indicates the DPD information.
14 . The method of claim 11 , wherein receiving the DPD information comprises receiving uplink control information via a physical uplink control channel that indicates the DPD information.
15 . The method of claim 11 , wherein the DPD information is received in a periodic manner or in an aperiodic manner.
16 . The method of claim 11 , wherein the DPD information is received in a semi-persistent manner.
17 . The method of claim 11 , wherein the reference signal is a channel state information reference signal (CSI-RS).
18 . The method of claim 11 , wherein the DPD information indicates a formula used for determining the estimate of the non-linearities of the power amplifier based at least in part on the reference signal.
19 . The method of claim 11 , further comprising:
receiving, from the UE, capability signaling that indicates the UE is capable of determining the DPD information based at least in part on the reference signal.
20 . The method of claim 11 , wherein the UE is associated with a beam of interest for a DPD calculation by the network entity.
21 . An apparatus for wireless communication at a user equipment (UE), comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
receive, from a network entity, a reference signal; and
transmit, to the network entity and via a feedback channel, digital pre-distortion (DPD) information that is based at least in part on the reference signal, wherein the DPD information indicates an estimate of non-linearities of a power amplifier at the network entity based at least in part on the reference signal.
22 . The apparatus of claim 21 , wherein the one or more processors, to transmit the DPD information, are configured to:
transmit uplink control information via a physical uplink shared channel that indicates the DPD information; or
transmit uplink control information via a physical uplink control channel that indicates the DPD information.
23 . The apparatus of claim 21 , wherein the one or more processors are further configured to:
determine the DPD information based at least in part on the reference signal, wherein the reference signal is a training signal for determining the DPD information.
24 . The apparatus of claim 21 , wherein the one or more processors are configured to:
transmit the DPD information in a periodic manner or in an aperiodic manner; or
transmit the DPD information in a semi-persistent manner.
25 . The apparatus of claim 21 , wherein:
the reference signal is a channel state information reference signal (CSI-RS); or
the DPD information indicates a formula used for determining the estimate of the non-linearities of the power amplifier based at least in part on the reference signal.
26 . The apparatus of claim 21 , wherein the one or more processors are further configured to:
transmit, to the network entity, capability signaling that indicates the UE is capable of determining the DPD information based at least in part on the reference signal.
27 . An apparatus for wireless communication at a network entity, comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
transmit, to a user equipment (UE), a reference signal; and
receive, from the UE and via a feedback channel, digital pre-distortion (DPD) information that is based at least in part on the reference signal, wherein the DPD information indicates an estimate of non-linearities of a power amplifier at the network entity based at least in part on the reference signal.
28 . The apparatus of claim 27 , wherein the one or more processors are further configured to:
perform DPD to a signal provided to the power amplifier based at least in part on the DPD information.
29 . The apparatus of claim 27 , wherein the one or more processors, to receive the DPD information, are configured to:
receive uplink control information via a physical uplink shared channel that indicates the DPD information; or
receive uplink control information via a physical uplink control channel that indicates the DPD information.
30 . The apparatus of claim 27 , wherein the one or more processors are further configured to:
receive, from the UE, capability signaling that indicates the UE is capable of determining the DPD information based at least in part on the reference signal.