Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication to apply, for one or more uplink communications of a spatial division multiplexing (SDM) configuration, a group indication associated with downlink beams. The UE may transmit the one or more uplink communications based at least in part on the group indication associated with the downlink beams. Numerous other aspects are described.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may receive an encoded communication, the encoded communication being encoded with a hierarchical coding scheme comprising: first layer code blocks including pairs of information bits and sets of first parity bits, and second layer code blocks including sets of second parity bits, with each set of the second parity bits associated with a subset of the first layer code blocks. The wireless communication device may decode the encoded communication based at least in part on one or more of the sets of the second parity bits that are associated with one or more of the first layer code blocks determined to have failed decoding based at least in part on one or more associated sets of the first parity bits. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive control signaling indicating a preamble configuration. The UE may receive a preamble in a time domain. The preamble may include a set of modulated bits during a first portion of an initial symbol duration of a slot. The set of modulated bits may include one or more of a first subset of network temporary identifier bits or a second subset of modulation and coding scheme (MCS) bits. The UE may process the preamble during a second portion of the initial symbol duration of the slot based on the preamble configuration.

Abstract: Methods, systems, and devices for wireless communications are described. A base station may transmit a set of code blocks to multiple user equipments (UEs). The base station may receive feedback pertaining to reception of each of the set of code blocks at each of the multiple UEs. The base station may generate, based on the feedback, a retransmission message that includes encoded data representative of a subset of code blocks of the set of code blocks and additional redundancy with respect to the subset of code blocks. The multiple UEs may receive the retransmission message and extract a portion corresponding the set of code blocks that were previously unsuccessfully decoded. The UEs may combine the portion of the set of code blocks with the unsuccessfully decoded code blocks to create an updated combined versions of the code blocks. The UEs may decode the combined versions of the code blocks.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may receive an encoded communication, the encoded communication being encoded with a hierarchical coding scheme comprising: first layer code blocks including pairs of information bits and sets of first parity bits, and second layer code blocks including sets of second parity bits, with each set of the second parity bits associated with a subset of the first layer code blocks. The wireless communication device may decode the encoded communication based at least in part on one or more of the sets of the second parity bits that are associated with one or more of the first layer code blocks determined to have failed decoding based at least in part on one or more associated sets of the first parity bits. Numerous other aspects are described.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs. The UE may receive a downlink communication, including applying digital post distortion (DPoD) correction based at least in part on measurements of the one or more downlink communications transmitted to the one or more additional UEs and the one or more indications of the parameters. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described for optimizing index modulated (IM) communications between a user equipment (UE) and a base station. The UE may identify a quantity of subcarriers for IM communications and transmit a message including an indication of the quantity of subcarriers to the base station. In some examples, the UE may transmit an indication of one or more subcarriers to exclude from IM communications. The base station may receive the indication of the quantity of subcarriers and/or the indication of the blacklisted subcarrier(s) and may determine a number of active subcarriers to be used based on at least the indication of the quantity of subcarriers. The base station may transmit an indication of the number of active subcarriers to the UE. The UE may process one or more received IM downlink signals based on the quantity of subcarriers.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station having one or more antenna ports, a communication that includes one or more data streams and a tone reservation signal, wherein a number of the one or more antenna ports is different than a number of the one or more data streams. The UE may perform channel estimation based at least in part on the communication. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. The method includes receiving, from a base station, control signaling identifying a measurement configuration for one or more non-linear estimation measurements of reference signals associated with a power amplifier configuration of the base station, receiving, from the base station, the reference signals on a set of resources identified by the measurement configuration, performing one or more non-linear estimation measurements associated with the power amplifier configuration of the base station based on the received reference signals, and transmitting, to the base station according to the measurement configuration, a measurement report based on the one or more non-linear estimation measurements.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, in a slot, a preamble provided based at least in part on an orthogonal frequency division multiplexing (OFDM) waveform. The UE may perform an estimation operation based at least in part on the preamble. The UE may receive, in the slot, a data transmission via a single carrier time-domain waveform based at least in part on the estimation operation. Numerous other aspects are provided.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of a non-linearity model associated with one or more downlink communications. The UE may receive the one or more downlink communications based at least in part on the non-linearity model. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. The method may include a user equipment (UE) transmitting, to a base station, signaling indicating a capability of the UE to utilize a demodulation reference signal (DMRS) for channel state information (CSI) reporting. Upon receiving the signaling, the base station may transmit the DMRS and the UE may update a parameter of a CSI report in response to the received DMRS. The UE may then transmit the CSI report to the base station and the base station may utilize the CSI report for subsequent communications with the UE.

Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for mapping coding indices associated with a rateless coding scheme to respective sets of communication resources over which a transmitting device may perform transmissions of portions of a message corresponding to each of the coding indices. In some aspects, for example, different coding indices may correspond to different cumulative portions of the message and the transmitting device may transmit a first cumulative portion of the message corresponding to a first coding index over a first set of communication resources to which the first coding index is mapped. The transmitting device may signal an indication of such a resource mapping scheme to a receiving device and the receiving device may attempt to decode transmissions of one or more cumulative portions of the message using the indicated resource mapping scheme.

Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for signaling mechanisms associated with transmission puncturing schemes for rateless coding. In some aspects, a transmitting device may encode a message using a rateless code associated with a cumulative encoding of various portions of the message and may perform transmission puncturing to adapt a bit rate of related signal transmissions. The transmitting device may signal an indication of the transmission puncturing scheme, and potentially one or more modifications to the transmission puncturing scheme, to a receiving device via control signaling. The transmitting device may modify the transmission puncturing scheme in accordance with prioritizing retransmissions for some cumulative portions of the message ahead of other cumulative portions, such as by granting prioritized cumulative portions of the message relatively earlier transmission occasions in the transmission puncturing scheme.

Abstract: Methods, systems, and devices for wireless communications are described, including a movable relay location variance report. The movable relay location variance report may enable more robust and accurate communications between a control node (e.g., a user equipment (UE) and a base station) and a movable relay (e.g., a drone) equipped with a reconfigurable intelligent surface (RIS). In some aspects, the location variance report may characterize the variance of the drone's location and transmit the information to the UE, the base station, or both. The location variance report may influence the control node beam width, the drone location, and an angle at which the drone may position a RIS. The control node may indicate an adjusted set of parameters to the drone based on receiving the location variance report.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication that tone reservation is to be applied, to a subsequent communication, including applying rate matching on a first set of tone reservation (TR) subcarriers and applying puncturing on a second set of the TR subcarriers. The UE may receive the subsequent communication based at least in part on rate matching being applied to the first set of the TR subcarriers and puncturing being applied to the second set of the TR subcarriers. Numerous other aspects are described.

Abstract: A phase tracking reference signal (PTRS) may be enhanced to carry data encoded with a relative low modulation and coding scheme (MCS). A receive device may receiving a data channel, the data channel including a transport block encoded using a first MCS. The receiving device may receiving a PTRS interleaved with the data channel. The PTRS is encoded with the second MCS that is lower than the first MCS. The receiving device may decode the PTRS to determine PTRS data. The receiving device may track phase noise using the PTRS data as a transmitted sequence of the PTRS. The receiving device may decode the transport block for the data channel based on the first MCS and the tracked phase noise.

Abstract: Aspects of the present disclosure include methods, apparatuses, and computer readable media for identifying an initial rank, modulating information into a first plurality of layers associated with the initial rank, scrambling the first plurality of layers by a first common scrambler to generate a first plurality of scrambled layers, transmitting, to the receiver, the first plurality of scrambled layers, receiving an indication of failed demodulation of a portion of the first plurality of scrambled layers, modulating at least a portion of the information into a second plurality of layers, wherein the second plurality of layers includes a same number of layers as the first plurality of layers, scrambling the second plurality of layers by a second common scrambler to generate a second plurality of scrambled layers, and transmitting, to the receiver, the second plurality of scrambled layers.

Abstract: Methods, systems, and devices for wireless communication are described. A communication device, such as a user equipment (UE) may receive a set of demodulation reference signal (DMRS) samples including a first subset of DMRS samples associated with a first power level and a second subset of DMRS samples associated with a second power level. The UE may perform a digital post distortion operation based on the first subset of DMRS samples associated with the first power level and the second subset of DMRS samples associated with the second power level. The UE may receive the wireless communication based on performing the digital post distortion operation.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may perform both a channel estimation and a non-linearity estimation (e.g., a power amplifier (PA) model estimation) on a demodulation reference signal (DMRS) transmitted by a base station. For example, the DMRS may include two portions that correspond to two peak-to-average power ratio (PAPR) values. Low PAPR values may enable the UE to perform the channel estimation, and high PAPR values may enable the UE to perform the PA non-linearity estimation. Accordingly, a first portion of the DMRS may correspond to a lower PAPR value, and the second portion of the DMRS may correspond to a higher PAPR value. In some examples, the base station may signal different parameters for each portion of the DMRS to the UE, or the UE may use fixed values to receive each portion of the DMRS.