Non-linearity estimation for envelope tracking PA

A method of wireless communication at a user equipment (UE), comprising:

• receiving, from a base station, one or more signaling messages or pilots;
• identifying a combined power amplifier (PA) and envelope tracking (ET) non-linearity model associated with the base station based on the one or more signaling messages or pilots;
• and
• compensating for a distortion in one or more subsequent signals from the base station based on the identified combined PA and ET non-linearity model, the distortion being associated with a PA circuitry and an ET circuitry, the PA circuitry and the ET circuitry being associated with the base station;
• and wherein at least one of:
• the one or more signaling messages or pilots include an indication of an ET non-linearity model, and wherein the ET non-linearity model corresponds to a filter response model associated with the ET circuitry associated with the base station;
• the one or more signaling messages or pilots are associated with a plurality of power levels, and further comprising estimating a threshold envelope value associated with the ET circuitry being enabled or disabled based on the one or more signaling messages or pilots;
• at least some of the one or more signaling messages or pilots are associated with one or more bandwidths that are less than a threshold;
• or
• compensating for the distortion comprises performing a digital post-distortion (DPoD) process associated with the one or more subsequent signals from the base station based on the identified combined PA and ET non-linearity model.

An apparatus for wireless communication at a base station, comprising:

• memory;
• and
• at least one processor coupled to the memory and configured to:
• identify one or more signaling messages or pilots usable for identifying a combined power amplifier (PA) and envelope tracking (ET) non-linearity model associated with the base station, the combined PA and ET non-linearity model being associated with a PA circuitry and an ET circuitry, the PA circuitry and the ET circuitry being associated with the base station;
• and
• transmit, to a user equipment (UE), the one or more signaling messages or pilots, and wherein at least one of:
• the one or more signaling messages or pilots include an indication of an ET non-linearity model, and wherein the ET non-linearity model corresponds to a filter response model associated with the ET circuitry associated with the base station;
• the one or more signaling messages or pilots are associated with a plurality of bandwidths, and the one or more signaling messages or pilots are usable for estimating one or more ET characteristics associated with the base station;
• the one or more signaling messages or pilots are associated with a plurality of power levels, and the one or more signaling messages or pilots are usable for estimating a threshold envelope value associated with the ET circuitry being enabled or disabled;
• at least some of the one or more signaling messages or pilots are associated with one or more bandwidths that are less than a threshold;
• or
• the at least one processor is further configured to:
• transmit, to the UE, a first set of pilots of the one or more signaling messages or pilots with the ET circuitry disabled, the first set of pilots being usable for identifying a PA non-linearity model;
• and transmit, to the UE, a second set of pilots of the one or more signaling messages or pilots with the ET circuitry enabled, the second set of pilots being, in combination with the PA non-linearity model, usable for identifying the combined PA and ET non-linearity model.

A method of wireless communication at a base station, comprising:

• identifying one or more signaling messages or pilots usable for identifying a combined power amplifier (PA) and envelope tracking (ET) non-linearity model associated with the base station, the combined PA and ET non-linearity model being associated with a PA circuitry and an ET circuitry, the PA circuitry and the ET circuitry being associated with the base station;
• and
• transmitting, to a user equipment (UE), the one or more signaling messages or pilots, and wherein at least one of:
• the one or more signaling messages or pilots include an indication of an ET non-linearity model, and wherein the ET non-linearity model corresponds to a filter response model associated with the ET circuitry associated with the base station;
• the one or more signaling messages or pilots are associated with a plurality of bandwidths, and the one or more signaling messages or pilots are usable for estimating one or more ET characteristics associated with the base station;
• the one or more signaling messages or pilots are associated with a plurality of power levels, and the one or more signaling messages or pilots are usable for estimating a threshold envelope value associated with the ET circuitry being enabled or disabled;
• at least some of the one or more signaling messages or pilots are associated with one or more bandwidths that are less than a threshold;
• or
• further comprising:
• transmitting, to the UE, a first set of pilots of the one or more signaling messages or pilots with the ET circuitry disabled, the first set of pilots being usable for identifying a PA non-linearity model;
• and transmitting, to the UE, a second set of pilots of the one or more signaling messages or pilots with the ET circuitry enabled, the second set of pilots being, in combination with the PA non-linearity model, usable for identifying the combined PA and ET non-linearity model.