Qualcomm Incorporated

Intel Corporation

Snap Inc.

Elad Meir

Gideon Shlomo Kutz

Assaf Touboul

Tal Oved

Amit Bar-Or Tillinger

Shay Landis

Ronen Shaked

Amit Bar-or Tillinger

Yaron Laufer

Assaf Gurevitz

Qinghua Li

Xiaogang Chen

Michael Levitsky

Feng Jiang

Yaniv Eistein

Yaron Yoffe

Aviv Regev

Shlomi Vituri

Ram Krips

David Yunusov

Ory Eger

Oren Kaidar

Moshe Ben-Ari

Rafi Ben-Tal

Oren Matsrafi

Ori Barak

Hagay Barel

Shiomi Vituri

Methods, systems, and devices for wireless communications are described. The method may include a user equipment (UE) transmitting a capability message indicating a capability of the UE to support a positioning scheme for one or more reference signals within a precoding resource block group for a channel estimation procedure, receiving, based on the capability message, a control signal indicating a frequency allocation for the one or more reference signals for the channel estimation procedure, the frequency allocation for the one or more reference signals being based on the positioning scheme supported by the UE, receiving the one or more reference signals for the channel estimation procedure in accordance with the frequency allocation, and performing the channel estimation procedure using the one or more reference signals based on the precoding resource block group associated with the channel estimation procedure.

Reference signal formation for precoding resource block groups

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.

Adaptive determination of constellation point usage probabilities

Aspects relate to signaling relating to a non-linearity model for power amplifier circuitry of a transmitting device. The power amplifier circuitry may apply digital pre-distortion (DPD) to a signal prior to amplification and transmission of the signal. A receiving device may apply digital post-distortion (DPoD) to a signal received from the transmitting device where the DPoD is based on the non-linearity model. The transmitting device may send to the receiving device non-linearity parameters for the non-linearity model.

Signaling of information for non-linearity model

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 α, 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.

Signal-to-noise ratio balancing using singular value combiner precoder matrices

Methods, systems, and devices for wireless communications are described. The described techniques relate to improved methods, systems, devices, and apparatuses that support demodulation reference signal sharing across user equipments (UEs) supporting over the air (OTA) digital pre-distortion (DPD). For example, the described techniques provide for demodulation reference signal (DMRS) sharing across UEs supporting OTA DPD. A network entity may share a full DMRS pattern with multiple frequency-division multiplexed (FDMed) UEs. Based on the shared DMRS pattern, the UEs may evaluate the non-linear impairment by estimating non-linearity (NL) compensation function coefficients. Each of the UEs may indicate, to the network entity, their estimated NL compensation function coefficients. The network entity may apply an updated NL compensation function based on the NL compensation function coefficients from the various UEs and transmit a downlink transmission according to the updated NL compensation function.

Demodulation reference signal sharing across user equipments (UEs) supporting over the air digital pre-distortion

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for non-linearity estimation techniques for digital post distortion (DPoD) in a wireless system. In some aspects, a first wireless device may estimate a power amplifier (PA) non-linearity associated with a second wireless device using select signaling from the second wireless device. For example, the first wireless device may use a received signal to estimate the PA non-linearity if a dynamic power range associated with the signal triggers the estimation of the PA non-linearity (such as if the dynamic power range associated with the signal satisfies, or is expected to satisfy, a threshold dynamic power range). If the dynamic power range of the signal triggers the estimation of the PA non-linearity, the first wireless device may introduce DPoD to signaling received from the second wireless device in accordance with the estimation of the PA non-linearity.

Non-linearity estimation techniques for digital post distortion (DPoD) in a wireless system

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, an UE may receive an indication of a configuration for receiving reference signals (RSs) and for transmitting a digital pre-distortion (DPD) measurement. The UE may receive the RSs from a network node. The UE may transmit a first signal that indicates the DPD measurement as observed via the RSs at the first UE, the first signal configured for coherent combination over the air with a second signal that indicates a DPD measurement as observed via the RSs at a second UE, the first signal and the second signal scheduled for transmission via overlapping network resources. Numerous other aspects are described.

Techniques for combined digital pre-distortion with over-the-air signaling

Methods, systems, and devices for wireless communications are described. The described techniques provide for a transmitting device and a receiving device to coordinate channel aware tone reservation (CATR) control information using distributed coding. The transmitting device and receiving device may estimate a similar wireless channel and select a set of reserved tone locations and may each independently encode the set of reserved tone locations. In some cases, the receiving device may receive parity information associated with the set of reserved tone locations selected by the transmitting device and may jointly decode the parity information with the set of reserved tone locations predicted by the receiving device to detect and correct one or more errors in the predicted set of reserved tone locations.

Tone reservation signaling using distributed coding

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.

Space time coding for sidelink transmissions

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.

Techniques for bandwidth-limited envelope tracking using digital post distortion

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.

Envelope tracking for wideband signals using filter bank processing

Methods, systems, and devices for wireless communications are described. In some examples, when a high subcarrier spacing (SCS) is used for sidelink communications, the user equipments (UEs) may use a modified sidelink slot structure for the sidelink communications. In one example, the slot structure may include at least two automatic gain control (AGC) symbols with at least one sidelink control channel symbol between the two AGC symbols. The UE may perform an AGC procedure during the two AGC symbols and the sidelink control channel symbol. In some examples, the slot structure may include bundled slots to minimize per slot overhead associated with AGC symbols and sidelink control channel symbols. For example, at a high SCS, the slot structure may include a first slot including multiple AGC symbols, Subsequent bundled slots may not include AGC symbols and/or sidelink control channel symbols.

Slot structure for automatic gain control for high subcarrier spacing

Methods, systems, and devices for wireless communications are described. Generally, a base station may indicate, to a user equipment (UE), when it changes a power amplifier (PA) non-linearity model. The base station may transmit a set of parameters for the PA model, and a set of parameters for a non-linear equalizer function for the UE to use during a digital post-processing procedure (DPoD). The base station may indicate, to the UE, a lookup table, a vector of lookup tales, a set of kernels (e.g., from which the UE may estimate the coefficients of the PA model), or a set of both the kernels and the coefficients for the PA model. Similarly, for the non-linear equalizer function, the base station may indicate an explicit indication of the function, or may indicate a lookup table, or a kernels series (e.g., with or without corresponding coefficients).

High order digital post-distortion procedures

A base station may identify one or more signaling messages or pilots usable for identifying a combined PA and ET non-linearity model associated with the base station. The combined PA and ET non-linearity model may be associated with a PA circuitry and an ET circuitry. The PA circuitry and the ET circuitry may be associated with the base station. The base station may transmit, to the UE, and the UE may receive, from the base station, the one or more signaling messages or pilots. The UE may identify a combined PA and ET non-linearity model associated with the base station based on the one or more signaling messages or pilots. The UE may compensate for a distortion in one or more subsequent signals from the base station based on the identified combined PA and ET non-linearity model.

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Ramat Gan, Israel

Elad Meir