Abstract: Methods, systems, and devices for wireless communications are described. A network entity may transmit one or more reference signals to a user equipment (UE). The network entity may receive, from the UE, channel estimation information based on the reference signals and observed channel conditions for the UE during a first time slot. The network entity may determine, based on the received channel estimation information, a first channel condition prediction associated with a first sub-slot of a second time slot and a second channel condition prediction associated with a second sub-slot of the second time slot. The network entity may determine multiple precoders based on the channel condition predictions. The network entity may communicate with the UE using a first precoder during the first sub-slot of the second time slot and a second precoder during the second sub-slot of the second time slot.

Abstract: In a wireless communication system, a peak to average power ratio (PAPR) may affect the efficiency of a power amplifier. To reduce a PAPR, a transmitting device may utilize a PAPR reduction precoding that changes a received signal without performance impact so the overall transmit PAPR is reduced. The transmitting device constructs a frequency domain (FD) response to the PAPR reduction precoding, estimates a channel to one or more receiving devices, and applies the PAPR reduction precoding to the estimated channel. The transmitting device constructs a multiple input multiple output (MIMO) precoding matrix considering the FD response of the PAPR reduction precoding and applies the MIMO precoding matrix and the PAPR reduction precoding to an FD signal. A receiving device applies the FD response conjugated to a received FD signal from the transmitting device and processes at least a received reference signal based on the PAPR reduction precoder.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless node may receive a code block. The wireless node may predict a low density parity check (LDPC) decoding result for the code block in accordance with received log likelihood ratio (LLR) histogram information associated with the code block. The wireless node may configure an LDPC decoder in accordance with the predicted LDPC decoding result for the code block. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. A first network entity may receive control signaling from a second network entity, the control signaling indicating an image mask representing a color filter array that is used to generate mosaic images at the second network entity. The first network entity may receive a first image from the second network entity over a wireless communications channel and the first image may be a single layer image including a mosaic pattern according to the color filter array. The first network entity may generate a second image based on the first image and the image mask and the second image may include multiple layers associated with colors of the second image.

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: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a configuration signal indicating that tone reservation is activated on a first set of resource elements of a downlink transmission for out of band transmission reduction, where a second set of resource elements of the downlink transmission is reserved for data transmission. The UE may then receive, from a network entity, the downlink transmission including the first set of resource elements and the second set of resource elements. After receiving the downlink transmission, the UE may decode the downlink transmission in accordance with the configuration signal.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may precode communications with a precoding configured to improve non-linearity (NL). Some aspects more specifically relate to a user equipment (UE) obtaining power amplifier (PA) NL coefficients associated with NL of PAs of a network node. The UE may transmit an indication of the PA NL coefficients to the network node, which may use the indication to select precoding configured to improve reception of communications transmitted with PA NL or to improve decoding of communications transmitted using the precoding.

Abstract: Certain aspects of the present disclosure provide techniques for simulating a receiver for link adaptation. A method for wireless communications by an apparatus includes obtaining, from an UE, parameters of a UE receiver; determining channel characteristics of a communication channel between the apparatus and the UE based on a measurement of a signal received from the UE; estimating a response of the UE receiver communicating on the communication channel having the channel characteristics based on a digital representation of the UE receiver, wherein the digital representation of the UE receiver is based on the parameters of the UE receiver; determining, based on the estimated response, at least one parameter for communication on the communication channel with the UE; sending, to the UE, an indication of the at least one parameter; and communicating with the UE in accordance with the at least one parameter.

Abstract: The described techniques may support multi-rank sidelink communications that may be reduced to single rank communications if failure to decode the multi-rank sidelink communications occurs. A user equipment (UE) may transmit a first message including first data using a first precoding vector applied for a first layer and a second precoding vector applied for a second layer. If the first message is not decoded successfully, the UE may transmit a second message including second data using a third precoding vector applied for the first layer and a fourth precoding vector applied for the second layer, where the second data is derived from the first data, the third precoding vector is derived from the second precoding vector, and the fourth precoding vector is derived from the first precoding vector. The second message may effectively reduce a rank of the first message when the channel is rank deficient.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a capability message indicating a capability of the UE to perform bandwidth-limited envelope tracking or a capability of the UE to compensate for bandwidth-limited envelope tracking distortion. The UE may receive a request for the UE to activate bandwidth-limited envelope tracking or a request for the UE to compensate for bandwidth-limited envelope tracking distortion. In some examples, the UE may transmit an uplink message using a bandwidth-limited envelope tracking configuration. In other examples, the UE may receive a downlink message and use digital post distortion (DPoD) to correct bandwidth-limited envelope tracking distortions in the downlink message. Aspects of the present disclosure may enable the UE to use bandwidth-limited envelope tracking and DPoD for wideband signal transmissions, which may result in lower power consumption at the UE.

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: Method and apparatus for HARQ procedures for DVC. The apparatus sorts one or more bits of a payload based on a corresponding priority. The apparatus divides the payload into one or more groups based on the corresponding priority, where each of the one or more groups is encoded separately. The apparatus transmits, to a second wireless device, a video frame over a span of one or more slots based at least on a prioritized transmission of the one or more groups.

Abstract: Methods, systems, devices, and apparatuses that support rateless polar codes are used to provide for retransmissions in cases that a codeword is encoded using a rateless polar code. For example, a first wireless device may transmit, to a second wireless device, a codeword corresponding to a set of information bits encoded using a rateless polar code. In cases where the first wireless device identifies that the second wireless device failed to decode one or more of the information bits, the first wireless device may select a subset of the encoder input bits for retransmission based on an order of a likelihood of error associated with a set of bit-channels used for encoding the set of information bits using the polar code. The number of retransmitted encoder input bits may be based further on a gap to capacity calculated by the first wireless device and/or the second wireless device.

Abstract: Certain aspects of the present disclosure provide techniques for envelope tracking schemes for a node in a wireless communication network. One aspect provides a method for wireless communication by a transmitter device. The method generally includes: combining envelopes associated with subbands of an input signal to be amplified for transmission based on a combination function; amplifying, via an amplifier, the input signal to generate a transmission signal, the input signal being amplified based on a combined envelope signal, representing the combination of the envelopes, received at a supply input of the amplifier; and transmitting the transmission signal to a receiver device.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive one or more non-linearity measurements, each non-linearity measurement being associated with a transmit antenna power amplifier. The UE may receive initial antenna information. The UE may select a first non-linearity cancellation algorithm from among a plurality of non-linearity cancellation algorithms based, at least in part, on the one or more non-linearity measurements and the initial antenna information. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communication are described. A request associated with probabilities of respective points of a constellation for communication of a set of data symbols using a channel may be received. The channel may be between a wireless device and a network entity. The probabilities may indicate respective likelihoods of the respective points being used in the communication of the set of data symbols. Signaling may be communicated in accordance with the set of probabilities of the respective points, where the set of probabilities may be adapted to characteristics of radio frequency impairments associated with the channel. The characteristics of the radio frequency impairments may be measured by a wireless device.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may transmit a request, for an uplink transmission or a downlink transmission, for amplitude modulated phase tracking reference signals; and communicate the uplink transmission or the downlink transmission based at least in part on the request. Numerous other aspects are provided.

Abstract: Certain aspects of the present disclosure provide techniques for wireless communication by a user equipment, including in one example: receiving a relay characteristic report, wherein the relay characteristic report indicates an intrinsic channel delay of a relay device; determining a channel delay spread of the channel; and transmitting an indication to affect relay device operation based at least in part on the channel delay spread and the intrinsic channel delay of the relay device.

Abstract: User equipments (UEs) may be configured to perform channel occupancy information multi-access reporting. In some aspects, a user equipment may receive a sidelink configuration message identifying the first UE and one or more other UEs as members of a multicast group and a resource to be used for sidelink communications amongst the multicast group, and receive channel occupancy information (COI) from at least one of the one or more UEs within the multicast group, the COI indicating an occupied condition of the resource determined by the at least one of the one or more UEs during a sensing operation performed with respect to the resource. Further, the UE may select a period of time to transmit a sidelink communication based at least in part on the COI.

Abstract: Methods, systems, and devices for wireless communication are described. A base station may configure multiple phase tracking reference signal (PTRS) patterns in a single time interval (e.g., a slot) to improve phase tracking and phase noise estimation. The base station may transmit control signaling indicating multiple PTRS patterns for the time interval, and a user equipment (UE) may monitor for PTRSs in the time interval according to the indicated patterns to estimate a phase for receiving a downlink message from the base station. In some examples, the UE may signal a list of preferred PTRS patterns for the base station to use based on channel conditions. For example, the UE may transmit a report indicating one or more preferred PTRS patterns and a respective quantity of symbols in which the base station is to use each pattern.