Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) with phase noise (PN) suppression capabilities may indicate, to a network node, a quantity of subcarriers corresponding to an assumed PN bandwidth (for example, a portion of a frequency spectrum in which the UE can estimate and cancel PN) and a residual error associated with the assumed PN bandwidth. In some aspects, the network node may then configure a phase tracking reference signal (PTRS) size (for example, a quantity and location of PTRS pilots) according to current the PN suppression capability of the UE. Furthermore, in cases where the UE changes the current PN suppression capability, the UE may indicate the updated PN suppression capability to the network node such that the PTRS size be appropriately updated for subsequent downlink transmissions.

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: 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. In some aspects, a user equipment (UE) may receive an indication of transmission spur frequency locations associated with transmissions of a network node. The UE may receive a communication from the network node, receiving the communication comprising performing one or more of channel estimation or noise estimation based at least in part on the transmission spur frequency locations. Numerous other aspects are described.

Abstract: A first wireless communication device receives spur measurement information associated with one or more frequency domain spurs in a transmission signal spectrum of a second wireless communication device. The spur measurement information indicates a baseband frequency and an expected power of each of the one or more frequency domain spurs. The first wireless communication device receives one or more signals from the second wireless communication device and processes the one or more signals in accordance with the spur measurement information to compensate the one or more signals for the one or more frequency domain spurs in the transmission signal spectrum of the second wireless communication device. In some implementations, the first wireless communication device receives the spur measurement information in association with transmitting spur suppression capability information that indicates a capability of the first wireless device to estimate and correct frequency domain spurs.

Abstract: The apparatus may be a wireless device configured to transmit, for a network device, a first indication mapping each of a plurality of residual integrated phase noise powers (RIPNPs) to a corresponding number of subcarriers, receive, based on the first indication, a second indication of a number of subcarriers including a phase tracking reference signal (PTRS), receive, via one or more symbols, a transmission including a data signal and the PTRS over the number of subcarriers indicated in the second indication, and perform a demodulation of the data signal using a phase noise estimation based on the PTRS. The apparatus may be a network device configured to obtain, from a wireless device, the first indication, output, based on the first indication, the second indication, and transmit, via one or more symbols, the transmission including the data signal and the PTRS.

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: Methods, systems, and devices are described that support a report message for indicating non-linearity cancelation capability. A user equipment (UE) may receive one or more references signals from a network entity, where the reference signals are associated with a downlink resource allocation. The UE may measure a link quality metric for the reference signals. The UE may transmit a report message that includes at least a parameter indicating a non-linearity threshold associated with a capability of the UE to process non-linearity of downlink signals, where the parameter is based on the link quality metric and one or more characteristics of the downlink resource allocation. The network entity may receive the report message and transmit one or more downlink messages in accordance with the downlink resource allocation and based on the parameter.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of one or more precoding resource group (PRG) parameters associated with a network node. The UE may perform, using the one or more PRG parameters, interference rejection combining. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications using a singular value decomposition (SVD) combiner precoder are described. The described techniques may enable a network entity to determine which streams of a set of multiple data streams to combine in the SVD combiner precoder to increase a lowest signal-to-noise ratio of the set of multiple data streams, and which streams of the multiple streams to leave separate. The network entity may determine a precoding matrix using a square matrix ?, which may allow the network entity to dynamically combine (e.g., or not combine) data streams. The network entity may transmit an indication to a UE indicating which streams the network entity will combine and which streams the network entity will not combine. The UE may accordingly demodulate the non-combined streams with a relatively less complex demodulator and may demodulate the combined streams with a relatively more complex demodulator.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support signaling of network entities' phase noise inter-carrier interference (ICI) order for reducing user equipment (UE) phase noise cancelation complexity. In a first aspect, a method of wireless communication includes obtaining a power spectral density (PSD) measurement of a phase noise mask of a network entity prior to deployment in the field. The network entity, after deployment, measures an integrated residual PSD measurement per candidate phase noise bandwidth size and transmits these integrated residual PSD measurements to a UE. The UE may then use the integrated residual PSD measurements to estimate phase noise for cancelation from network entity transmissions. Other aspects and features are also claimed and described.

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: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) with phase noise (PN) suppression capabilities may indicate, to a network node, a quantity of subcarriers corresponding to an assumed PN bandwidth (for example, a portion of a frequency spectrum in which the UE can estimate and cancel PN) and a residual error associated with the assumed PN bandwidth. In some aspects, the network node may then configure a phase tracking reference signal (PTRS) size (for example, a quantity and location of PTRS pilots) according to current the PN suppression capability of the UE. Furthermore, in cases where the UE changes the current PN suppression capability, the UE may indicate the updated PN suppression capability to the network node such that the PTRS size be appropriately updated for subsequent downlink transmissions.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network node, an indication of a slot to be associated with precoder estimation, the indication of the slot including an indication of a first precoder and one or more parameters associated with the slot. The UE may receive, from the network node and during the slot, a first one or more reference signals associated with estimating a physical channel using the first precoder and a second one or more reference signals associated with estimating a second precoder using the estimated physical channel. The UE may receive, from the network node, one or more signals based on the second precoder. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. Techniques described herein provide for a user equipment (UE) to determine a channel estimation associated with a downlink channel. In some examples, a network entity may determine a projection matrix and may transmit, to the UE, control signaling indicating the projection matrix. The UE may determine the channel estimation associated with the downlink channel based on the projection matrix. The UE may receive data signaling from the network entity, and the UE may demodulate the data signaling according to the channel estimation that is based at least in part on the projection matrix.

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.

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment may transmit, to a serving network entity, a message requesting a quantity of transmission layers scheduled to be used by one or more neighbor network entities for communication within a communication resource. In response, the user equipment may receive, from the serving network entity, an indication of the quantity of transmission layers scheduled to be used by one or more neighbor network entities for communication within the communication resource. The user equipment may apply the quantity of transmission layers for the communication resource to a rank-aware interference rejection algorithm and may use the rank-aware interference rejection algorithm to improve a noise covariance matrix estimation. When receiving a downlink message, from the serving network entity via the communication resource, the improved noise covariance matrix estimation may be used to mitigate interference at the communication resource.

Abstract: Methods, systems, and devices for wireless communications are described. Techniques described herein provide for a user equipment (UE) to determine a channel estimation associated with a downlink channel. In some examples, a network entity may determine a projection matrix and may transmit, to the UE, control signaling indicating the projection matrix. The UE may determine the channel estimation associated with the downlink channel based on the projection matrix. The UE may receive data signaling from the network entity, and the UE may demodulate the data signaling according to the channel estimation that is based at least in part on the projection matrix.

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).