Abstract: Method and apparatus for dynamic control of power amplifier back off for repeaters. The apparatus uses a channel model to model a first signal at a channel output. The channel model models a channel between a receiver and a transmitter. The apparatus performs a PAPR reduction on the first signal at the receiver to generate a second signal having a reduced PAPR. The apparatus inputs the second signal through an inverse channel model to generate an output signal. The apparatus outputs the output signal to the receiver, such that the PAPR of the output signal is reduced at an input of the receiver.

Abstract: Methods, systems, and devices for wireless communications are described. A transmitting device may determine channel quality, and may shape frequency domain noise (e.g., crest factor reduction (CFR) related noise) to locations in which channel quality is poor. For example, by shaping channel noise to frequency resources with poor channel quality (e.g., instead of uniformly distributing such channel noise), transmissions may be more reliable, and quality on other frequency resources may be improved (e.g., without negatively impacting the quality of communications via frequency resources that already have a low channel quality), resulting in improved dynamic range of the signal (e.g., peak to average power ratio (PAPR)), which means that power efficiency is improved.

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 while monitoring for a wakeup signal from the network node, a set of synchronization signal blocks (SSBs) that are respectively mapped to a set of SSB transmission resources. The UE may transmit, to the network node, a sequence via a resource associated with the set of SSB transmission resources, where the resource may be mapped to an SSB of the set of SSBs associated with a highest signal quality metric associated with the set of SSBs. The UE may receive, from the network node, a feedback communication that indicates successful reception of the sequence and an indication that one or more subsequent downlink transmissions are associated with a transmission configuration indication state associated with the SSB. Numerous other aspects are described.

Abstract: Aspects described herein include devices and methods for facilitating digital predistortion calibration. For example, a communication device can include an antenna array; a plurality of transmit elements; a plurality of receive elements, wherein each receive element is coupled to an associated antenna element of the plurality of antenna elements; and control circuitry, the control circuitry configured to: determine a set of transmit-receive element pairs for online calibration of the communication device, wherein a quantity of transmit elements in the set is less than a quantity of transmit elements in the plurality of transmit elements, and wherein a quantity of receive elements in the set is less than a quantity of receive elements in the plurality of transmit elements; and apply a second calibration setting to the communication device during online operation based on a respective near field measurement of each transmit-receive element pair during the online operation.

Abstract: Methods, systems, and devices for wireless communications are described in which a first user equipment (UE) may relay a wake up signal (WUS) for a second UE. A WUS may be modulated using on-off keying. The first UE may be within the WUS range of the network entity while the second UE may be outside of the WUS range. The network entity may indicate to the first UE to relay WUSs that include the identifier for the second UE. The first UE may receive and relay the WUS intended for the second UE via a lower power transceiver of the first UE. The first UE may relay WUSs while in a reduced power mode. The second UE may receive the relayed WUS via a lower power transceiver of the second UE and may wake a primary transceiver of the second UE in response to the WUS.

Abstract: Certain aspects of the present disclosure provide techniques for channel state feedback via a wake-up receiver. An example method includes obtaining a first configuration that indicates to send a first channel state information (CSI) report based on a first set of parameters associated with a first receiver; obtaining a second configuration that indicates to send a second CSI report based on a second set of parameters associated with a second receiver that includes a wake-up receiver; obtaining first signaling; and sending the second CSI report based on one or more first measurements of the first signaling.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may operate in a discontinuous reception (DRX) mode. The UE may receive control messages indicating reference signal and wakeup signal (WUS) configurations. The reference signal configuration may indicate a reference signal position associated with reference signals and the WUS configuration may indicate a WUS position associated with WUSs and within a time-domain offset of the reference signal position. For example, the WUS position may be directly before or after the reference signal position. The offset may be based on durations associated with the UE transitioning (e.g., ramping up and ramping down) between sleep modes and an awake mode. The reference signal position may be within a DRX cycle period offset in time from the WUS position. The UE may monitor for the WUSs, the reference signals, and in some implementations, data, according to the offset.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, for transmission of an uplink communication, an indication of a first allocation of first resources on a first bandwidth and, for transmission of pilots for interference measurement associated with the uplink communication, an indication of a second allocation of second resources on a second bandwidth. The UE may transmit the uplink communication on the first resources on the first bandwidth and the pilots on the second resources on the second bandwidth, the second bandwidth being different from the first bandwidth. Numerous other aspects are described.

Abstract: A training signal generator for forming an input signal for an ADC-under-test includes a one-bit DAC and an analog low-pass filter. The one-bit DAC converts a binary sequence into a DAC output signal that is then filtered by the analog low-pass filter to form an ADC input signal. The ADC-under-test converts the ADC input signal into an ADC output signal. A digital low-pass filter converts the binary sequence into a plurality of samples. A digital signal processing system processes the plurality of samples and the ADC output signal to form an estimate of the ADC input signal. An ADC linearizer may then be trained to characterize a non-linear impairment of the ADC-under-test responsive to a comparison of the estimate of the ADC input signal and the ADC output signal.

Abstract: Disclosed are techniques for wireless sensing. In an aspect, a sensing node transmits one or more first reference signals based on a hybrid beamforming codebook for transmit beamforming, wherein the hybrid beamforming codebook for transmit beamforming defines one or more transmit beams for communication purposes, detects a trigger to switch from the hybrid beamforming codebook for transmit beamforming to a sensing codebook for transmit beamforming, wherein the sensing codebook for transmit beamforming defines one or more transmit beams for sensing purposes, and transmits one or more second reference signals based on the sensing codebook for transmit beamforming, wherein each transmit beam for sensing purposes of the one or more transmit beams for sensing purposes uses fewer transmit antenna elements than a corresponding transmit beam for communication purposes of the one or more transmit beams for communication purposes.

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 scheduling configurations. The UE may receive a wakeup signal (WUS) that indicates selection of a specific scheduling configuration of the one or more scheduling configurations. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may include a main radio and a low-power wake-up radio. While operating in a radio resource control (RRC) inactive state, the UE may use the low-power wake-up radio to monitor for signals. In some examples, the UE or a network entity may determine a relatively small amount of data (e.g., satisfying a threshold data volume) for communication between the UE and the network entity. The UE may receive a low-power synchronization signal via the low-power wake-up radio and may measure a signal strength or quality associated with the low-power synchronization signal. The UE may use this low-power synchronization signal measurement to determine whether to initiate a small data transmission (SDT) session for communicating the data. The UE may transmit an SDT initiation message if the low-power synchronization signal measurement satisfies a threshold value.

Abstract: Methods, systems, and devices for wireless communications are described in which a configuration of a wake-up signal (WUS), synchronization signal (SS), or both, may be selected based on one or more conditions at a user equipment (UE) that is to receive the signal. The configuration of the WUS, the SS, or both, may indicate a value (M) that corresponds to a quantity of bits per duration of time, such as per orthogonal frequency division multiplexing (OFDM) symbol duration. The configuration may also indicate whether an associated signal is transmitted with or without Manchester coding. In some implementations, a UE may transmit an indication of a requested or preferred configuration for a WUS or SS, and may be configured in accordance with the requested configuration.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may perform, using a low power receiver at the UE, one or more measurements associated with a lower layer triggered mobility (LTM) procedure. The UE may transmit a measurement report comprising a first indication of the one or more measurements and a second indication that the one or more measurements are performed using the low power receiver. The UE may receive, based at least in part on transmitting the measurement report, a command associated with the LTM procedure, the command indicating for the UE to switch from a first serving cell to a second serving cell. Numerous other aspects are described.

Abstract: A method for wireless communication at a user equipment (UE) and related apparatus are provided. In the method, the UE measures the power of a transmission channel for communication between the UE and a network entity during a predetermined time window via a power detector of the UE. Based on the power of the transmission channel, the UE monitors for a wake-up signal (WUS) using a wake-up radio (WUR) or a main radio (MR). The WUS may or may not include a preamble. If the WUS includes a preamble, the UE monitors for the WUS based on the preamble. The method enables a UE to sense the power level associated with a WUS using a power detector, and use a radio that adapts better to the perceived power level (e.g., the WUR or the MR) to monitor for the WUS. Hence, it improves the power consumption efficiency of wireless communication.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment may receive a first control signal that indicates a distortion management configuration for an uplink transmission by the UE. The distortion management configuration may indicate a plurality of spatial layers to use and may indicate a proportion of non-linear distortion to allocate to each spatial layer of the plurality of spatial layers. The UE may receive a control message indicating to transmit an uplink message. The UE may precode the uplink message to generate a precoded message for transmission via the plurality of spatial layers in accordance with the distortion management configuration. The UE may transmit the precoded message via the plurality of spatial layers in accordance with the control message.

Abstract: A UE may detect, at the UE, a suspected fabricated transmission attack based on PHY security. The UE may transmit, to a network node, and the network node may receive, from the UE, an indication of the suspected fabricated transmission attack. The network node may receive, from the UE, an indication of one or more characteristics associated with a potential attacker associated with the suspected fabricated transmission attack. The UE may transmit, via a sidelink to at least one additional UE, a second indication of whether the UE identifies that the suspected fabricated transmission attack corresponds to the UE being attacked. The network node may identify a geographical location of the potential attacker based on a plurality of indications of the one or more characteristics associated with the potential attacker. The network node may compile an adversary pool including one or more compromised identities.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, using a low-power wake-up radio (LP-WUR), a low-power wake-up signal (LP-WUS) in a set of symbols, wherein the set of symbols includes a first subset of the set of symbols and a second subset of the set of symbols occurring after the first subset of the set of symbols, wherein control information is conveyed starting at the second subset of the set of symbols. The UE may communicate, using a main radio, in accordance with the LP-WUS. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may perform an operation indicated by control bits in a low power wake up signal (LP-WUS), where the control bits may indicate the operation based on a type of the LP-WUS. The type of the LP-WUS may be based on whether a control channel monitoring occasion associated with the LP-WUS is within an active duration of a discontinuous reception (DRX) cycle, and the UE may determine the type of the LP-WUS based on resources for receiving the LP-WUS, the resources of the control channel monitoring occasion associated with the LP-WUS, a control bit indicated by the LP-WUS, or any combination thereof. The control bits may include one or more of a bitmap format and a codepoint format, where the format of the control bits may be based on the type of the LP-WUS.

Abstract: Certain aspects of the present disclosure are directed towards a method for wireless communications at a first device. The method generally includes: transmitting training signals using a subset of beam weights; receiving feedback signaling based on the training signals; and transmitting a communication signal with digital pre-distortion (DPD) using DPD coefficients determined based on the feedback signaling.