Multi-user digital post distortion

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.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for multi-user digital post distortion.

BACKGROUND

SUMMARY

Some aspects described herein relate to a method of wireless communication performed by a user equipment (UE). The method may include receiving one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs. The method may include receiving 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.

Some aspects described herein relate to a method of wireless communication performed by a base station. The method may include transmitting, to a UE, one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs. The method may include transmitting a downlink communication. The method may include receiving hybrid automatic repeat request (HARD) acknowledgment (HARQ-ACK) feedback for the downlink communication based at least in part on the UE applying DPoD correction that is 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.

Some aspects described herein relate to a UE for wireless communication. The user equipment may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to receive one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs. The one or more processors may be configured to receive a downlink communication, including applying 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.

Some aspects described herein relate to a base station for wireless communication. The base station may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to transmit, to a UE, one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs. The one or more processors may be configured to transmit a downlink communication. The one or more processors may be configured to receive HARQ-ACK feedback for the downlink communication based at least in part on the UE applying DPoD correction that is 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.

Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a UE. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive a downlink communication, including applying 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.

Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a base station. The set of instructions, when executed by one or more processors of the base station, may cause the base station to transmit, to a UE, one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs. The set of instructions, when executed by one or more processors of the base station, may cause the base station to transmit a downlink communication. The set of instructions, when executed by one or more processors of the base station, may cause the base station to receive HARQ-ACK feedback for the downlink communication based at least in part on the UE applying DPoD correction that is 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.

Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs. The apparatus may include means for receiving a downlink communication, including applying 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.

Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for transmitting, to a UE, one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs. The apparatus may include means for transmitting a downlink communication. The apparatus may include means for receiving HARQ-ACK feedback for the downlink communication based at least in part on the UE applying DPoD correction that is 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.

DETAILED DESCRIPTION

In some aspects, the UE120may include a communication manager140. As described in more detail elsewhere herein, the communication manager140may receive one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs; and receive a downlink communication, including applying 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. Additionally, or alternatively, the communication manager140may perform one or more other operations described herein.

In some aspects, the base station110may include a communication manager150. As described in more detail elsewhere herein, the communication manager150may transmit, to a UE, one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs; transmit a downlink communication; and receive HARQ-ACK feedback for the downlink communication based at least in part on the UE applying DPoD correction that is 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. Additionally, or alternatively, the communication manager150may perform one or more other operations described herein.

In some aspects, the UE includes means for receiving one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs; and/or means for receiving a downlink communication, including applying 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. The means for the UE to perform operations described herein may include, for example, one or more of communication manager140, antenna252, modem254, MIMO detector256, receive processor258, transmit processor264, TX MIMO processor266, controller/processor280, or memory282.

In some aspects, the base station includes means for transmitting, to a UE, one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs; means for transmitting a downlink communication; and/or means for receiving HARQ-ACK feedback for the downlink communication based at least in part on the UE applying DPoD correction that is 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. The means for the base station to perform operations described herein may include, for example, one or more of communication manager150, transmit processor220, TX MIMO processor230, modem232, antenna234, MIMO detector236, receive processor238, controller/processor240, memory242, or scheduler246.

FIG.3is a diagram illustrating an example300of a digital post distortion process performed by a receiving device, in accordance with the present disclosure. For example, a receiving device (e.g., a UE) may receive a downlink communication, carried on signals, from a transmitting device (e.g., a base station). In some networks, the transmitting device may transmit signals with increasing non-linearity as power amplification increases. For example, a power amplifier (PA) of the transmitting device may distort a signal as a result of a relatively high peak to average power ratio (PAPR). The receiving device may perform a DPoD process to correct for (e.g., estimate and/or remove) non-linear noise and address clipping issues that may arise as a result of the increased non-linearity introduced by power amplification. For example, the receiving device may reconstruct transmission non-linearities and subtract the transmission non-linearities from a received signal (e.g., in an iterative process).

As shown in example300, an antenna group component305may receive one or more signals (e.g., y_n) that are mapped to resources in a time domain and a frequency domain. Discrete Fourier transform (DFT) component310may be used to transform the signals into frequency domain signals (e.g., Y_K). After DFT, the receiving device may perform the DPoD process on the frequency domain signals to remove non-linear noise from the signals.

The receiving device may perform the DPoD process iteratively, where in each iteration, a DPoD component315may perform hard decision slicing (e.g., using hard demapper/slicer component320). Hard decision slicing uses sliced symbols in the frequency domain (e.g., Y_K) to reconstruct the time domain signal (e.g., an estimation of the time domain signal) as generated by the transmitting device before power amplification. The reconstructed time domain signal (e.g., X_k) is then passed through a non-linear model (e.g., D(X) estimator component325) to estimate and or correct for non-linearity of the time domain signal and produce an estimated non-linearity of the time domain signal (e.g., D_K).

The non-linear model may use a variety of kernels to estimate the non-linearity of the reconstructed time domain signal. In each iteration of the DPoD process, a kernel or set of kernels may be used to estimate the non-linearity of the reconstructed time domain signal. For example, memory-less kernels (e.g., kernels that act on samples without using prior iteration/timing data), such as x*|x|2and/or x*|x|4, among other examples, may be used to estimate non-linearity. In some situations (e.g., large bandwidth situations, high signal-to-noise ratio (SNR) situations, among other examples), the non-linear model may use memory kernels (e.g., kernels that use a mixture of different time samples), such as x[n]*|x[n-k]|M, where x is a sample of the signal, n is a timestamp, k is a delay value, and M is an integer. Other kernels may also be used, such as xn2·xn−1*, and/or |xn|·xn+1, among other examples.

The estimated non-linearity (e.g., D_K) may then be removed (e.g., subtracted) from the time domain signal (e.g., Y_K) by combiner component330. After estimating and removing non-linearity (e.g., non-linear noise, or error), the DPoD process may proceed with further iterations or continue with signal demapping and decoding. For example, the receiving device may demap output from the combiner component330(e.g., using demapper component335) to generate a log-likelihood ratio (LLR) demapped signal (e.g., LLR_b) that has corrected power amplifier (PA) nonlinearity. A decoder340of the receiver may decode the demapped signal to generate a payload of the signal (b_k).

Based at least in part on the receiving device performing DPoD, the transmitting device may transmit signals using a power amplifier at power levels near a compression point. This may improve power efficiency at the transmitting device, improve capacity of a cell provided by the transmitting device, and/or may support increased transmission power for improved coverage for transmissions from the transmitting device (e.g., an improved signal-to-noise-ratio (SNR)), among other examples. However, when a set of UEs are multiplexed in a frequency domain, a UE may perform a poor estimation of transmission non-linearities (e.g., non-linear noise and/or address clipping) using signals on resources allocated for the UE.

In some aspects described herein, a UE may apply DPoD based at least in part on measurements of signals associated with downlink transmissions to one or more additional UEs. For example, the UE may estimate a transmitted time domain signal of the UE and the one or more additional UEs to reconstruct and subtract the transmission non-linearities from a signal received on resources allocated for a downlink communication to the UE.

In some aspects, the UE may perform (e.g., on signals received on resources allocated to the UE and the one or more additional UEs) channel estimation (e.g., to calculate equalization parameters) and equalization of the signals received on the resources allocated for the downlink communication to the UE. In some aspects, the UE may perform equalization without slicing (e.g., minimum mean squared error (MMSE)-based equalization). The UE may perform equalization without slicing to reduce complexity and limit parameters needed to perform the channel estimation. In this way, the UE may perform equalization without an indication from the base station of MCS, constellation configurations, and/or other information associated with the resources allocated to the one or more additional UEs.

In some aspects, the UE may receive an indication of parameters associated with one or more downlink communications transmitted to the one or more additional UEs. For example, the parameters may include a frequency domain resource assignment (e.g., a frequency domain resource allocation (FDRA)), a time domain resource assignment (e.g., a time domain resource allocation (TDRA)), an indication of one or more antenna ports used to transmit the one or more downlink communications, a DMRS sequence initialization, scrambling identifications of the one or more additional UEs, phase tracking reference signal (PTRS)-related parameters, and/or channel state information reference signals (CSI-RS)-related parameters, among other examples.

In some aspects, the UE may receive the indication of the parameters via downlink control information (DCI). For example, the UE may receive DCI that indicates a frequency domain resource assignment, a time domain resource assignment and/or the one or more antenna ports used to transmit the one or more downlink communications, among other examples.

In some aspects, the base station may indicate radio network temporary identifiers (RNTIs) of the one or more additional UEs having downlink communications that are frequency-division multiplexed with the downlink communication of the UE. The UE may use the RNTIs to monitor DCI messages transmitted to the one or more additional UEs to extract and identify the parameters (e.g., DCI-based parameters) for the downlink communications.

In some aspects, the base station may indicate the parameters using a DCI format (e.g., a new DCI format) that supports the indication of DCI parameters associated with downlink communications transmitted to UEs having downlink communications that are frequency-division multiplexed with the downlink communication of the UE. In some aspects, the base station may indicate the parameters using a common DCI message (e.g., a groupcast DCI message) for multiple UEs (e.g., the UE and the one or more additional UEs) having downlink communications that are frequency-division multiplexed. The common DCI message may indicate parameters for the multiple UEs to perform DPoD using downlink communications transmitted to others of the multiple UEs.

In some aspects, the UE may receive the indication of the parameters using higher layer signaling (e.g., medium access control (MAC) control element (CE) signaling and/or radio resource control (RRC) signaling, among other examples). In some aspects, the parameters received via higher layer signaling may include scrambling identifications of the one or more UEs, PTRS-related parameters, and/or CSI-RS related parameters, among other examples.

In some aspects, the base station may signal the parameters (e.g., higher layer parameters) for candidate UEs (e.g., UEs that may have downlink communications that are frequency-division multiplexed with downlink communications of the UE) in RRC messages. The UE may use the RRC messages to generate a data store of parameters for the candidate UEs. The UE may receive, for a downlink communication and using dynamic signaling (e.g., DCI), an indication of identities (e.g., RNTIs or a hash of the RNTIs, among other examples) the one or more additional UEs having downlink communications that are frequency-division multiplexed with the downlink communication.

In some aspects, the base station may transmit, and the UE may receive, a groupcast message for the candidate UEs to share the parameters. The candidate UEs may be determined by spatial positions (e.g., with UEs sharing a same beam or a beam within a threshold transmission angle from the base station), with the UE performing DPoD correction using parameters and downlink signaling associated with the one or more additional UEs that have downlink communications transmitted in a same set of time domain resources (e.g., simultaneously or in a same slot, among other examples) using the same beam or the beam within the threshold transmission angle from the base station.

Based at least in part on the UE receiving one or more indications (e.g., DCI-based and/or higher-layer-based) of parameters associated with one or more downlink communications transmitted to the one or more additional UEs, the UE may apply DPoD correction to a downlink communication based at least in part on measurements of the one or more downlink communications and the parameters. In this way, the UE and base station may conserve network resources (e.g., based at least in part on communicating using improved spectral efficiency) and/or power resources based at least in part on supporting transmissions using increased PA power levels (e.g., with improved energy efficiency) that may cause distortion. Additionally, or alternatively, the UE may receive the downlink communication with an improved likelihood of decoding the downlink communication based at least in part on the UE using the parameters for the one or more additional UEs to estimate non-linearities of signaling of the downlink communication. In this way, the UE may conserve computing, power, communication, and/or network resources that may otherwise be used to detect and correct communication errors.

FIG.4is a diagram illustrating an example400associated with multi-user DPoD, in accordance with the present disclosure. As shown inFIG.4, a base station (e.g., base station110) may communicate with a UE (e.g., UE120). In some aspects, the base station and the UE may be part of a wireless network (e.g., wireless network100). The UE and the base station may have established a wireless connection prior to operations shown inFIG.4. One or more additional UEs may also be part of the wireless network. The base station may use frequency-division multiplexing to transmit downlink communications to the UE and the one or more additional UEs. Additionally, or alternatively, the base station may communicate with the UE and the one or more additional UEs using beamforming.

As shown by reference number405, the base station may transmit, and the UE may receive, configuration information. In some aspects, the UE may receive the configuration information via one or more of RRC signaling, one or more MAC CEs, and/or downlink control information (DCI), among other examples. In some aspects, the configuration information may include an indication of one or more configuration parameters (e.g., already known to the UE) for selection by the UE, or explicit configuration information for the UE to use to configure the UE, among other examples.

In some aspects, the configuration information may indicate that the UE is to apply DPoD correction to downlink communications from the base station. In some aspects, the configuration information may indicate that the UE is to transmit an indication of support for applying DPoD correction based at least in part on communications transmitted to one or more additional UEs. In some aspects, the configuration information may indicate that the base station is to indicate parameters associated with the communications transmitted to the one or more additional UEs, which parameters support the UE applying DPoD correction based at least in part on communications transmitted to one or more additional UEs. In some aspects, the configuration information may indicate how the base station will signal indications of the parameters. For example, the configuration information may indicate that the base station will indicate a first set of parameters via DCI and/or that the base station will indicate a second set of parameters via higher layer signaling (e.g., RRC or MAC CE). Additionally, or alternatively, the configuration information may indicate a type of DCI used to indicate the first set of parameters and/or resources used for the DCI, among other examples.

The UE may configure itself based at least in part on the configuration information. In some aspects, the UE may be configured to perform one or more operations described herein based at least in part on the configuration information.

As shown by reference number410, the UE may transmit, and the base station may receive, an indication of support for applying DPoD correction based at least in part on communications transmitted to the one or more additional UE (e.g., in a capabilities report). In some aspects, the UE may transmit the indication of support before receiving a portion of the configuration information described in connection with reference number405. For example, the UE and the base station may exchange a first communication of configuration information, the indication of support, and then a second communication of configuration information that is based at least in part on the indication of support.

As shown by reference number415, the UE may receive, and the base station may transmit, one or more indications of parameters associated with one or more downlink communications transmitted to the one or more additional UEs. The base station may transmit, and the UE may receive, the one or more indication of parameters using one or more DCI messages, one or more RRC message, and/or one or more MAC CEs. For example, the UE may receive a first set of the one or more indications of parameters via one or more DCI messages, a second set of the one or more indications of parameters via one or more RRC messages, and/or a third set of the one or more indications of parameters via one or more MAC CEs, among other examples.

In some aspects, the parameters may be associated with performing DPoD. For example, the parameters may include an indication of frequency domain resource assignment, an indication of time domain resource assignment, an indication of one or more antenna ports used by the base station to transmit the one or more communications, an indication of DMRS sequence initialization, an indication of scrambling identifications, an indication of phase tracking reference signal parameters, and/or an indication of CSI-RS parameters, among other examples.

In some aspects, the UE may receive the first set of the one or more indications via a DCI based at least in part on receiving an indication of RNTIs associated with the one or more UEs (e.g., associated with the scrambling identifications). The UE may use the RNTIs to receive (e.g., and descramble) DCI messages transmitted to the one or more additional UEs. The UE may identity, within the DCI messages transmitted to the one or more additional UEs, the first set of the one or more indications.

In some aspects, the UE may receive the first set of the one or more indications via a DCI message, addressed to the UE, that indicates the first set of one or more indications of parameters. Additionally, or alternatively, the UE may receive the first set of the one or more indications via a common DCI message, addressed to the UE and the one or more additional UEs, that indicates the first set of one or more indications of parameters. In this way, each of the UE and the one or more additional UEs may have the parameters needed to perform DPoD correction using downlink communications transmitted to other UEs.

In some aspects, the UE may receive a set of the one or more indications via RRC signaling, one or more MAC CEs, and/or one or more groupcast messages addressed to the UE and the one or more additional UEs (e.g., indicating the set of the one or more indications of parameters that are associated with a set of candidate additional UEs). The set of the one or more indications of parameters may include parameters that are associated with the set of candidate additional UEs that includes the one or more additional UEs. The UE may store (e.g., as a database or a table, among other examples) the parameters with different identifiers (e.g., a bitmap-based indication, RNTIs, hashes of the RNTIs, and/or scrambling identifications, among other examples).

The UE may receive, for the downlink communication, dynamic signaling (e.g., a DCI message and/or a MAC CE, among other examples) that indicates selection of the one or more additional UEs from the set of candidate additional UEs. The indication of the selection may include an indication of RNTIs, hashes of the RNTIs, and/or scrambling identifications, among other examples. The base station may transmit the dynamic signaling to indicate the selection of the one or more UEs based at least in part on the one or more UEs having downlink communications that are multiplexed in the frequency domain with the downlink communication and/or the one or more downlink communications scheduled for transmission on a same beam as the downlink communication or on a downlink beam that is within a threshold transmission angle from the base station, among other examples.

As shown by reference number420, the UE may receive, and the base station may transmit a downlink communication. For example, the UE may receive the downlink communication via a physical downlink shared channel (PDSCH) that is multiplexed in a frequency domain (e.g., during a same or overlapping set of time resources) with one or more additional PDSCHs that are associated with the one or more additional UEs.

As shown by reference number425, the UE may measure the one or more downlink communications transmitted to the one or more additional UEs. In some aspects, the UE may measure the one or more downlink communications during reception of the downlink communication. For example, the UE may measure the one or more downlink communications and the downlink communications using communication resources that overlap (e.g., partially or entirely) in time (e.g., the one or more downlink communications and the downlink communication may be frequency division multiplexed by the base station).

In some aspects, the base station may transmit the one or more downlink communications and the downlink communication via a same downlink beam. In some aspects, the base station may transmit a set (e.g., all or a subset) of the one or more downlink communications be a downlink beam that is within a threshold transmission angle from the base station.

As shown by reference number430, the UE may apply DPoD correction to the downlink communication. For example, the UE may apply 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.

In some aspects, the UE may apply the DPoD correction based at least in part on estimating a channel that includes allocations for the one or more downlink communications and the downlink communication. The UE may estimate constellation points of signals associated with the channel (e.g., using the one or more downlink communications and/or an estimate of the channel). The UE may equalize the signals based at least in part on the estimate of the channel and/or the estimate of the constellation points of the signals. Based at least in part on equalizing the signals, the UE may estimate non-linearities of the signals and correct for the non-linearities of a portion of the signals that are associated with the downlink communication.

As shown by reference number435, the UE may decode the downlink communication. The UE may decode the downlink communication based at least in part on applying the DPoD correction to the downlink communication.

As shown by reference number440, the UE may transmit HARQ-ACK feedback based at least in part on the downlink communication. In some aspects, the HARQ-ACK feedback may have an improved likelihood of being an ACK based at least in part on the UE applying DPoD correction that is 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.

Based at least in part on the UE receiving the one or more indications (e.g., DCI-based and/or higher-layer-based) of parameters associated with one or more downlink communications transmitted to the one or more additional UEs, the UE may apply DPoD correction to a downlink communication based at least in part on measurements of the one or more downlink communications and the parameters. In this way, the UE and base station may conserve network resources (e.g., based at least in part on communicating using improved spectral efficiency) and/or power resources based at least in part on supporting transmissions using increased PA power levels (e.g., with improved energy efficiency) that may cause distortion. Additionally, or alternatively, the UE may receive the downlink communication with an improved likelihood of decoding the downlink communication based at least in part on the UE using the parameters for the one or more additional UEs to estimate non-linearities of signaling of the downlink communication. In this way, the UE may conserve computing, power, communication, and/or network resources that may otherwise be used to detect and correct communication errors.

FIG.5is a diagram illustrating an example process500performed, for example, by a UE, in accordance with the present disclosure. Example process500is an example where the UE (e.g., UE120) performs operations associated with multi-user DPoD.

As shown inFIG.5, in some aspects, process500may include receiving one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs (block510). For example, the UE (e.g., using communication manager140and/or reception component702, depicted inFIG.7) may receive one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs, as described above.

As further shown inFIG.5, in some aspects, process500may include receiving a downlink communication, including applying 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 (block520). For example, the UE (e.g., using communication manager140and/or reception component702, depicted inFIG.7) may receive a downlink communication, including applying 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, as described above.

In a first aspect, the one or more downlink communications and the downlink communication are frequency division multiplexed by a transmitting device.

In a second aspect, alone or in combination with the first aspect, the one or more downlink communications and the downlink communication are transmitted via a same downlink beam from a transmitting device, or wherein the one or more downlink communications are transmitted via a first downlink beam and the downlink communication are transmitted via a second downlink beam that is within a threshold transmission angle from the transmitting device.

In a third aspect, alone or in combination with one or more of the first and second aspects, applying the DPoD correction comprises one or more of estimating a channel that includes allocations for the one or more downlink communications and the downlink communication, estimating constellation points of signals associated with the channel equalizing the signals, estimating non-linearities of the signals, or correcting for the non-linearities of a portion of the signals that are associated with the downlink communication.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, the one or more indications of parameters comprise one or more of an indication of frequency domain resource assignment, an indication of time domain resource assignment, an indication of one or more antenna ports, an indication of DMRS sequence initialization, an indication of scrambling identifications, an indication of phase tracking reference signal parameters, or an indication of CSI-RS parameters.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, receiving the one or more indications of parameters comprises one or more of receiving a first set of the one or more indications of parameters via one or more DCI messages, receiving a second set of the one or more indications of parameters via one or more RRC messages, or receiving a third set of the one or more indications of parameters via one or more MAC CEs.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, receiving the first set of the one or more indications of parameters via one or more DCI messages comprises receiving one or more RNTIs associated with the one or more additional UEs, receiving the one or more DCI messages that are associated with the one or more additional UEs, or identifying the one or more indications of the first set of the one or more indications of parameters associated with one or more downlink communications transmitted to the one or more additional UEs.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, receiving the first set of the one or more indications of parameters via one or more DCI messages comprises one or more of receiving a DCI message, addressed to the UE, that indicates the first set of one or more indications of parameters, or receiving a common DCI message, addressed to the UE and the one or more additional UEs, that indicates the first set of one or more indications of parameters.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, receiving the one or more indications of parameters comprises one or more of receiving, via RRC signaling or a MAC CE, a set of the one or more indications of parameters that are associated with a set of candidate additional UEs that includes the one or more additional UEs, or receiving, via dynamic signaling, an indication of selection of the one or more additional UEs from the set of candidate additional UEs.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the indication of the selection of the one or more additional UEs includes an indication of RNTIs of the one or more additional UEs or an indication of a hash of the RNTIs of the one or more additional UEs.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, receiving the set of the one or more indications of parameters that are associated with the set of candidate additional UEs comprises receiving a groupcast message, addressed to the UE and the one or more additional UEs, that indicates the set of the one or more indications of parameters that are associated with the set of candidate additional UEs.

In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the set of candidate additional UEs are associated with a same downlink beam, or wherein the set of candidate additional UEs are associated with downlink beams within a threshold transmission angle from a transmitting device.

FIG.6is a diagram illustrating an example process600performed, for example, by a base station, in accordance with the present disclosure. Example process600is an example where the base station (e.g., base station110) performs operations associated with multi-user DPoD.

As shown inFIG.6, in some aspects, process600may include transmitting, to a UE, one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs (block610). For example, the base station (e.g., using communication manager150and/or transmission component704, depicted inFIG.7) may transmit, to a UE, one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs, as described above.

As further shown inFIG.6, in some aspects, process600may include transmitting a downlink communication (block620). For example, the base station (e.g., using communication manager150and/or transmission component704, depicted inFIG.7) may transmit a downlink communication, as described above.

As further shown inFIG.6, in some aspects, process600may include receiving HARQ-ACK feedback for the downlink communication based at least in part on the UE applying DPoD correction that is 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 (block630). For example, the base station (e.g., using communication manager150and/or reception component702, depicted inFIG.7) may receive HARQ-ACK feedback for the downlink communication based at least in part on the UE applying DPoD correction that is 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, as described above.

In a first aspect, the one or more downlink communications and the downlink communication are frequency division multiplexed by a transmitting device.

In a second aspect, alone or in combination with the first aspect, the one or more downlink communications and the downlink communication are transmitted via a same downlink beam, or wherein the one or more downlink communications are transmitted via a first downlink beam and the downlink communication are transmitted via a second downlink beam that is within a threshold transmission angle from the base station.

In a third aspect, alone or in combination with one or more of the first and second aspects, the one or more indications of parameters comprise one or more of an indication of frequency domain resource assignment, an indication of time domain resource assignment, an indication of one or more antenna ports, an indication of DMRS sequence initialization, an indication of scrambling identifications, an indication of phase tracking reference signal parameters, or an indication of CSI-RS parameters.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, transmitting the one or more indications of parameters comprises one or more of transmitting a first set of the one or more indications of parameters via one or more DCI messages, transmitting a second set of the one or more indications of parameters via one or more RRC messages, or transmitting a third set of the one or more indications of parameters via one or more MAC CEs.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, transmitting the first set of the one or more indications of parameters via one or more DCI messages comprises transmitting one or more RNTIs associated with the one or more additional UEs, or transmitting the one or more DCI messages that are associated with the one or more additional UEs.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, transmitting the first set of the one or more indications of parameters via one or more DCI messages comprises one or more of transmitting a DCI message, addressed to the UE, that indicates the first set of one or more indications of parameters, or transmitting a common DCI message, addressed to the UE and the one or more additional UEs, that indicates the first set of one or more indications of parameters.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, transmitting the one or more indications of parameters comprises one or more of transmitting, via RRC signaling or a MAC CE, a set of the one or more indications of parameters that are associated with a set of candidate additional UEs that includes the one or more additional UEs, or transmitting, via dynamic signaling, an indication of selection of the one or more additional UEs from the set of candidate additional UEs.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the indication of the selection of the one or more additional UEs includes an indication of RNTIs of the one or more additional UEs or an indication of a hash of the RNTIs of the one or more additional UEs.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, transmitting the set of the one or more indications of parameters that are associated with the set of candidate additional UEs comprises transmitting a groupcast message, addressed to the UE and the one or more additional UEs, that indicates the set of the one or more indications of parameters that are associated with the set of candidate additional UEs.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the set of candidate additional UEs are associated with a same downlink beam, or wherein the set of candidate additional UEs are associated with downlink beams within a threshold transmission angle.

FIG.7is a diagram of an example apparatus700for wireless communication. The apparatus700may be a UE, or a UE may include the apparatus700. In some aspects, the apparatus700includes a reception component702and a transmission component704, which may be in communication with one another (for example, via one or more buses and/or one or more other components). As shown, the apparatus700may communicate with another apparatus706(such as a UE, a base station, or another wireless communication device) using the reception component702and the transmission component704. As further shown, the apparatus700may include a communication manager708(e.g., the communication manager140).

The transmission component704may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus706. In some aspects, one or more other components of the apparatus700may generate communications and may provide the generated communications to the transmission component704for transmission to the apparatus706. In some aspects, the transmission component704may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples), and may transmit the processed signals to the apparatus706. In some aspects, the transmission component704may include one or more antennas, a modem, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof, of the UE described in connection withFIG.2. In some aspects, the transmission component704may be co-located with the reception component702in a transceiver.

The reception component702may receive one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs. The reception component702may receive a downlink communication, including applying 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.

The number and arrangement of components shown inFIG.7are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown inFIG.7. Furthermore, two or more components shown inFIG.7may be implemented within a single component, or a single component shown inFIG.7may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown inFIG.7may perform one or more functions described as being performed by another set of components shown inFIG.7.

The transmission component804may transmit, to a UE, one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs. The transmission component804may transmit a downlink communication. The reception component802may receive HARQ-ACK feedback for the downlink communication based at least in part on the UE applying DPoD correction that is 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.

Aspect 1: A method of wireless communication performed by a user equipment (UE), comprising: receiving one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs; and receiving 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.

Aspect 2: The method of Aspect 1, wherein the one or more downlink communications and the downlink communication are frequency division multiplexed by a transmitting device.

Aspect 3: The method of any of Aspects 1-2, wherein the one or more downlink communications and the downlink communication are transmitted via a same downlink beam from a transmitting device, or wherein the one or more downlink communications are transmitted via a first downlink beam and the downlink communication are transmitted via a second downlink beam that is within a threshold transmission angle from the transmitting device.

Aspect 4: The method of any of Aspects 1-3, wherein applying the DPoD correction comprises one or more of: estimating a channel that includes allocations for the one or more downlink communications and the downlink communication, estimating constellation points of signals associated with the channel equalizing the signals, estimating non-linearities of the signals, or correcting for the non-linearities of a portion of the signals that are associated with the downlink communication.

Aspect 5: The method of any of Aspects 1-4, wherein the one or more indications of parameters comprise one or more of: an indication of frequency domain resource assignment, an indication of time domain resource assignment, an indication of one or more antenna ports, an indication of demodulation reference signal (DMRS) sequence initialization, an indication of scrambling identifications, an indication of phase tracking reference signal parameters, or an indication of channel state information reference signals (CSI-RS) parameters.

Aspect 6: The method of any of Aspects 1-5, wherein receiving the one or more indications of parameters comprises one or more of: receiving a first set of the one or more indications of parameters via one or more downlink control information (DCI) messages, receiving a second set of the one or more indications of parameters via one or more radio resource control (RRC) messages, or receiving a third set of the one or more indications of parameters via one or more medium access control (MAC) control elements (CEs).

Aspect 7: The method of Aspect 6, wherein receiving the first set of the one or more indications of parameters via one or more downlink control information (DCI) messages comprises: receiving one or more radio network temporary identifiers (RNTIs) associated with the one or more additional UEs; receiving the one or more DCI messages that are associated with the one or more additional UEs; or identifying the one or more indications of the first set of the one or more indications of parameters associated with one or more downlink communications transmitted to the one or more additional UEs.

Aspect 8: The method of Aspect 6, wherein receiving the first set of the one or more indications of parameters via one or more downlink control information (DCI) messages comprises one or more of: receiving a DCI message, addressed to the UE, that indicates the first set of one or more indications of parameters, or receiving a common DCI message, addressed to the UE and the one or more additional UEs, that indicates the first set of one or more indications of parameters.

Aspect 9: The method of any of Aspects 1-8, wherein receiving the one or more indications of parameters comprises one or more of: receiving, via radio resource control (RRC) signaling or a medium access control (MAC) control element (CE), a set of the one or more indications of parameters that are associated with a set of candidate additional UEs that includes the one or more additional UEs; or receiving, via dynamic signaling, an indication of selection of the one or more additional UEs from the set of candidate additional UEs.

Aspect 10: The method of Aspect 9, wherein the indication of the selection of the one or more additional UEs includes an indication of radio network temporary identifiers (RNTIs) of the one or more additional UEs or an indication of a hash of the RNTIs of the one or more additional UEs.

Aspect 11: The method of any of Aspects 9-10, wherein receiving the set of the one or more indications of parameters that are associated with the set of candidate additional UEs comprises: receiving a groupcast message, addressed to the UE and the one or more additional UEs, that indicates the set of the one or more indications of parameters that are associated with the set of candidate additional UEs.

Aspect 12: The method of any of Aspects 9-11, wherein the set of candidate additional UEs are associated with a same downlink beam, or wherein the set of candidate additional UEs are associated with downlink beams within a threshold transmission angle from a transmitting device.

Aspect 13: A method of wireless communication performed by a base station, comprising: transmitting, to a user equipment (UE), one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs; transmitting a downlink communication; and receiving hybrid automatic repeat request (HARD) acknowledgment (HARQ-ACK) feedback for the downlink communication based at least in part on the UE applying digital post distortion (DPoD) correction that is 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.

Aspect 14: The method of Aspect 13, wherein the one or more downlink communications and the downlink communication are frequency division multiplexed by a transmitting device.

Aspect 15: The method of any of Aspects 13-14, wherein the one or more downlink communications and the downlink communication are transmitted via a same downlink beam, or wherein the one or more downlink communications are transmitted via a first downlink beam and the downlink communication are transmitted via a second downlink beam that is within a threshold transmission angle from the base station.

Aspect 16: The method of any of Aspects 13-15, wherein the one or more indications of parameters comprise one or more of: an indication of frequency domain resource assignment, an indication of time domain resource assignment, an indication of one or more antenna ports, an indication of demodulation reference signal (DMRS) sequence initialization, an indication of scrambling identifications, an indication of phase tracking reference signal parameters, or an indication of channel state information reference signals (CSI-RS) parameters.

Aspect 17: The method of any of Aspects 13-16, wherein transmitting the one or more indications of parameters comprises one or more of: transmitting a first set of the one or more indications of parameters via one or more downlink control information (DCI) messages, transmitting a second set of the one or more indications of parameters via one or more radio resource control (RRC) messages, or transmitting a third set of the one or more indications of parameters via one or more medium access control (MAC) control elements (CEs).

Aspect 18: The method of Aspect 17, wherein transmitting the first set of the one or more indications of parameters via one or more downlink control information (DCI) messages comprises: transmitting one or more radio network temporary identifiers (RNTIs) associated with the one or more additional UEs; or transmitting the one or more DCI messages that are associated with the one or more additional UEs.

Aspect 19: The method of Aspect 17, wherein transmitting the first set of the one or more indications of parameters via one or more downlink control information (DCI) messages comprises one or more of: transmitting a DCI message, addressed to the UE, that indicates the first set of one or more indications of parameters, or transmitting a common DCI message, addressed to the UE and the one or more additional UEs, that indicates the first set of one or more indications of parameters.

Aspect 20: The method of any of Aspects 13-19, wherein transmitting the one or more indications of parameters comprises one or more of: transmitting, via radio resource control (RRC) signaling or a medium access control (MAC) control element (CE), a set of the one or more indications of parameters that are associated with a set of candidate additional UEs that includes the one or more additional UEs; or transmitting, via dynamic signaling, an indication of selection of the one or more additional UEs from the set of candidate additional UEs.

Aspect 21: The method of Aspect 20, wherein the indication of the selection of the one or more additional UEs includes an indication of radio network temporary identifiers (RNTIs) of the one or more additional UEs or an indication of a hash of the RNTIs of the one or more additional UEs.

Aspect 22: The method of Aspect 21, wherein transmitting the set of the one or more indications of parameters that are associated with the set of candidate additional UEs comprises: transmitting a groupcast message, addressed to the UE and the one or more additional UEs, that indicates the set of the one or more indications of parameters that are associated with the set of candidate additional UEs.

Aspect 23: The method of any of Aspects 21-22, wherein the set of candidate additional UEs are associated with a same downlink beam, or wherein the set of candidate additional UEs are associated with downlink beams within a threshold transmission angle.