Abstract: Methods, systems, and devices for wireless communications are described. A network entity may obtain from a user equipment (UE), a report that indicates one or more signal quality values associated with a set of communication chains of the UE. The network entity may perform a frequency domain residual sideband (FDRSB) identification procedure to determine an FDRSB correction table associated with a set of frequency bands and the set of communication chains. The network entity may output to the UE a control message indicating the FDRSB correction table that identifies which one or more frequency bands of the set of frequency bands and which one or more communication chains of the set of communication chains are associated with FDRSB correction. The UE may demodulate one or more messages via at least one communication chain of the set of communication chains based on FDRSB correction performed using the FDRSB correction table.

Abstract: Certain aspects of the present disclosure provide techniques for wireless communications. An example method includes identifying a first value for a scaling factor associated with scaling a gradient indication, wherein the gradient indication is associated with communicating gradient information for federated learning at the UE; transmitting, to a network entity, the first value; receiving, from the network entity, a second value for the scaling factor; and transmitting, to the network entity, the gradient indication using the second value for the scaling factor.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may transmit, to multiple user equipments (UEs), respective over-the-air digital pre-distortion (OTA-DPD) training signals, and may receive, from the multiple UEs, multiple PA model reports. The network node may perform a DPD correction procedure in accordance with the multiple PA model reports. Additionally or alternatively, the network node may receive, from a UE, a first and second PA model report in accordance with a first and second OTA-DPD training signal, respectively. The first PA model report may indicate a set of data bits and a first set of parity bits and the second PA model report may indicate a second set of parity bits that enable information associated with the second PA model report to be decoded using at least the second set of parity bits and the set of data bits.

Abstract: Certain aspects of the present disclosure provide techniques for wireless communications. An example method includes receiving, from a set of nodes, a set of sign indications indicating a set of signs for a set of values of a gradient associated with federated learning at the set of nodes; transmitting, to the set of nodes, a first decision regarding a selected value of the gradient in accordance with the set of sign indications; receiving, from the set of nodes, a set of second indications of a direction of the respective value of each node of the set of nodes indicating whether the respective value is greater than the selected value as indicated by the first decision or lesser than the selected value as indicated by the first decision; and transmitting a second decision indicating an update to the selected value in accordance with the set of second indications.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. Some aspects more specifically relate to dynamically selecting frequency resources to convey a phase tracking reference signal (PTRS). In some aspects, a network node may identify that a user equipment (UE) supports a PTRS that is contiguous over time resources and frequency resources. The network node may inform the UE of possible frequency resources for PTRS allocation. The UE may identify a frequency resource, from among the possible frequency resources, having a corresponding channel that can best support PTRS transmission. The UE may report the frequency resource to the network node, and the network node may transmit the PTRS, such as a contiguous PTRS, in accordance with the reported frequency resource.

Abstract: Certain aspects of the present disclosure provide techniques for wireless communications. An example method includes transmitting, to a set of nodes, first information associated with a first model parameter and a first gradient step value, the first information being associated with federated learning at the set of nodes; receiving, from the set of nodes, one or more first gradient indications for the first model parameter; and transmitting, to the set of nodes, second information associated with the first model parameter and a second gradient step value different from the first gradient step value, wherein: the second gradient step value is based at least in part on a first voting reliability associated with the first model parameter, and the first voting reliability is based at least in part on the one or more first gradient indications from the set of nodes and the first set of receive antennas.

Abstract: A device for federated machine learning, comprising: a communication system; one or more memories configured to store: values of model parameters of a machine learning (ML) model, and phase values; and one or more processors are configured to: apply the ML model, using the values of the model parameters, to model input data to determine model output data; determine an error function based on the model output data and expected output data; calculate a gradient of the error function; generate a plurality of frequency-domain values based on the gradient; generate modified frequency-domain values based on the phase values and the frequency-domain values; generate a time-domain digital signal based on the modified frequency-domain values; wherein the communication system is configured to transmit an analog radio frequency (RF) signal based on the time-domain digital signal.

Abstract: Methods, systems, and devices for wireless communications are described. A network entity may indicate to a user equipment (UE) (e.g., in a downlink control message) a capability of the network entity to disable power amplifiers for downlink transmissions. In response to the capability indication, the UE may estimate and report to the network entity the delay spread and antenna array loss threshold of a downlink signal. Based on the reported delay spread and antenna array loss threshold, the network entity may determine a quantity of power amplifiers that may be disabled for downlink transmission without reducing the received signal power at the UE below a minimum threshold. The power amplifiers that the network entity disables may be the power amplifiers with input powers less than a threshold (e.g., less than a highest input power by a threshold).

Abstract: Various aspects of the present disclosure generally relate to wireless communication. Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. In some examples, the described techniques can be used to improve latency and reduce power consumption of a DPoD process performed by the network node. For example, in association with identifying the one or more kernels for the subset of candidate kernels, the network node may consume a reduced amount of power and may identify the one or more kernels with reduced latency, when compared with testing each candidate kernel. Additionally or alternatively, the UE may conserve power resources by using PAs of the UE with reduced power (with an increased NL region) in association with the improved latency of the DPoD process performed by the network node.

Abstract: Methods, systems, and devices for wireless communications are described. A network entity may indicate to a user equipment (UE) (e.g., in a downlink control message) a capability of the network entity to disable power amplifiers for downlink transmissions. In response to the capability indication, the UE may estimate and report to the network entity the delay spread and antenna array loss threshold of a downlink signal. Based on the reported delay spread and antenna array loss threshold, the network entity may determine a quantity of power amplifiers that may be disabled for downlink transmission without reducing the received signal power at the UE below a minimum threshold. The power amplifiers that the network entity disables may be the power amplifiers with input powers less than a threshold (e.g., less than a highest input power by a threshold).

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support compression point information reporting and enhanced power allocation operations. In a first aspect, a method of wireless communication includes receiving a reference signal and transmitting compression point information responsive to the reference signal, where the compression point information is determined based on the reference signal. The method of wireless communication further includes receiving a transmission responsive to the compression point information and in accordance with a power allocation based on the transmission of the compression point information. Other aspects and features are also claimed and described.

Abstract: Apparatus, methods, and computer program products for wireless communication are provided. An example method may include transmitting, to a network node, information associated with a first quantity of effective downlink transmit (Tx) antennas associated with the UE. The example method may further include receiving, from the network node, a transmission indicative of a set of precoding functions for a set of Tx antennas associated with the network node, where each precoding function of the set of precoding functions is associated with a respective group of multiple Tx antennas of the set of Tx antennas associated with the network node, and where a second quantity of precoding functions is smaller than or equal to the first quantity of the effective downlink Tx antennas. The example method may further include receiving, from the network node, a second transmission based on the set of precoding functions.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit nonlinearity (NL) cancellation capability information associated with the UE. The UE may receive a request to indicate a quantity of parameters to estimate per power amplifier (PA) and a quantity of receive antennas. The UE may transmit a report that indicates the quantity of parameters and the quantity of receive antennas. Numerous other aspects are described.

Abstract: Certain aspects of the present disclosure provide techniques for techniques for code blocks groups (CBGs) configuration for wireless communications. An example method by a user equipment (UE) includes receiving, from a network entity, an indication of a policy for determining a code block group (CBG) configuration for a first transport block (TB), wherein the indicated policy indicates at least a channel metric for determining the CBG configuration, determining the indicated channel metric based on the indicated policy and one or more channel measurements, and transmitting, to the network entity, an indication of the CBG configuration, wherein the CBG configuration is based on the determined channel metric.

Abstract: Apparatus, methods, and computer program products for wireless communication are provided. An example method may include receiving, from a network node, at least one channel state information reference signal (CSI RS). The example method may further include transmitting, to the network node, information indicative of at least one power associated with a post-processing frequency domain residual sideband and a noise per each antenna associated with the UE in a channel state feedback (CSF) report based on the at least one CSI RS. The example method may further include receiving, from the network node, a power allocation configuration based on the information indicative of the at least one power associated with the post-processing frequency domain residual sideband and the noise per each antenna associated with the network node.

Abstract: Methods, systems, and devices for wireless communications are described. A component of a user equipment (UE) may experience non-linearity behavior. Using a digital post distortion (DPOD) process, the UE may estimate non-linear distortion caused by the non-linearity behavior and may use the estimated non-linear distortion to cancel or mitigate distortion at a received downlink signal. To improve the non-linear distortion estimation, a network entity may determine and transmit to the UE recommended kernel set sizes to use at a DPOD algorithm of the DPOD process. The recommended kernel set sizes may be based on a quantity of receive antenna in use at the UE and an instantaneous SNR measurement at the UE. The UE may utilize one of the recommended kernel set sizes in performing the DPOD process on a received downlink signal to mitigate or cancel the non-linear distortion.

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit a capability message to a network entity indicating a capability of the UE to perform a successive non-linear distortion correction process. The UE may also transmit a control message indicating a quantity of parallel processes supported at the UE and associated with each of a quantity of sub-iterations of the successive non-linear distortion correction process. The network entity may transmit, and the UE may receive, based on the control message, a scheduling configuration message indicating a schedule for performing respective subsets of a set of non-linear estimation processes during each sub-iteration of the quantity of sub-iterations of the successive non-linear distortion correction process.

Abstract: Certain aspects of the present disclosure provide techniques for digital post distortion (DPD) with antenna selection. A method for wireless communication by a user equipment (UE) includes receiving signaling from a network entity indicating one or more selected transmit antennas. The method includes receiving a data transmission from the network entity and performing DPOD processing of the data transmission based on the one or more selected transmit antennas.

Abstract: Methods, systems, and devices for wireless communications are described. A network entity may obtain from a user equipment (UE), a report that indicates one or more signal quality values associated with a set of communication chains of the UE. The network entity may perform a frequency domain residual sideband (FDRSB) identification procedure to determine an FDRSB correction table associated with a set of frequency bands and the set of communication chains. The network entity may output to the UE a control message indicating the FDRSB correction table that identifies which one or more frequency bands of the set of frequency bands and which one or more communication chains of the set of communication chains are associated with FDRSB correction. The UE may demodulate one or more messages via at least one communication chain of the set of communication chains based on FDRSB correction performed using the FDRSB correction table.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may apply a precoding operation to a downlink physical channel. The network node may obtain a plurality of coefficients associated with a non-linearity of the downlink physical channel in accordance with estimating a cross-correlation of a plurality of power delay profiles associated with the precoding operation. The network node may precode a physical downlink shared channel communication in accordance with a result of the precoding operation. The network node may transmit the plurality of coefficients via a physical downlink control channel communication. Numerous other aspects are described.