# US 12,166,513 B1 · Adaptive digital post-distortion and modulation and coding scheme index reporting > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,166,513 B1 - Document ID: US12166513B1 - Status: Granted - Kind: B1 - Application number: 18/317,667 - Filed: 2023-05-15 - Published: 2024-11-21 - Granted: 2024-12-10 - Earliest claimed: 2023-05-15 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Aviv Regev; Amit Moses; Ronen Shaked - Web page: https://patentgrep.com/patent/US12166513B1 ## CPC - H04B 1/04: Circuits - H03F 1/3241: {using predistortion circuits (H03F1/3211, H03F1/3217 take precedence)} - H04B 1/62: for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0018: {based on latency requirement} - H04L 1/0036: {arrangements specific to the receiver} - H04L 27/0008: {arrangements for allowing a transmitter or receiver to use more than one type of modulation (negotiating modulation type for two-way transmission paths H04L5/1453)} - H04L 27/0012: {arrangements for identifying the type of modulation} - H04L 27/01: Equalisers {(baseband equalizers at the transmitter end H04L25/03343; in analogue transmission systems H04B3/04, H04B7/005)} - H04L 1/0017: {where the mode-switching is based on Quality of Service requirement} - H04L 1/0025: {Transmission of mode-switching indication} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0023: {Time-frequency-space} - H04L 27/34: Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems - H04L 2027/0038: {using an equaliser} - H04B: TRANSMISSION - H03F: AMPLIFIERS - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Methods, systems, and devices for wireless communications are described. The described techniques may provide for an adaptive digital post-distortion (DPoD) procedure and reporting of modulation and coding scheme (MCS) indices for communications between a user equipment (UE) and a network entity. The UE may select a kernel from a set of kernels indicated by the network entity for a DPoD procedure based on a target error vector magnitude (EVM). Additionally, or alternatively, the UE may determine a limitation for an MCS index for the network entity to use in communications with the UE based on a power limitation of the UE and an EVM associated with the MCS. The network entity and the UE may accordingly communicate using the MCS limitation requested by the UE and the determined DPoD kernel. ## Claims ### Claim 1 An apparatus for wireless communications at a user equipment (UE), comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receive an indication of a plurality of digital post-distortion kernels associated with a network entity, each digital post-distortion kernel associated with one or more error vector magnitudes; select a digital post-distortion kernel of the plurality of digital post-distortion kernels associated with the network entity based at least in part on a target error vector magnitude at the UE; transmit an indication of a modulation and coding scheme index in accordance with the selected digital post-distortion kernel and the target error vector magnitude; and receive a downlink message based at least in part on the selected digital post-distortion kernel and the indicated modulation and coding scheme index. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the instructions to select the digital post-distortion kernel are executable by the processor to cause the apparatus to: select the target error vector magnitude from the one or more error vector magnitudes based at least in part on an error vector magnitude threshold. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the error vector magnitude threshold is based at least in part on one or more of a modulation order, a modulation and coding scheme, a battery level of the UE, or any combination thereof. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: select the modulation and coding scheme index based at least in part on a signal-to-noise ratio associated with communications between the UE and the network entity, the indication of the plurality of digital post-distortion kernels, and a battery level the UE. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the indication of the plurality of digital post-distortion kernels comprises, for each digital post-distortion kernel of the plurality of digital post-distortion kernels, an indication of one or more corresponding error vector magnitudes. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein the instructions to receive the downlink message are executable by the processor to cause the apparatus to: receive the downlink message in accordance with a second modulation and coding scheme index that is different from the indicated modulation and coding scheme index based at least in part on a priority of the downlink message. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: demodulate the downlink message based at least in part on the selected digital post-distortion kernel and the indicated modulation and coding scheme index. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: transmit a capability message indicating a capability of the UE to perform adaptive digital post-distortion. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the instructions to receive the indication of the plurality of digital post-distortion kernels are executable by the processor to cause the apparatus to: receive a medium access control-control element or a radio resource control message indicating the plurality of digital post-distortion kernels. ### Claim 10 An apparatus for wireless communications at a network entity, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: transmit an indication of a plurality of digital post-distortion kernels associated with the network entity, each digital post-distortion kernel associated with one or more error vector magnitudes; receive an indication of a modulation and coding scheme index in accordance with a digital post-distortion kernel of the plurality of digital post-distortion kernels and a target error vector magnitude; and transmit a downlink message based at least in part on the modulation and coding scheme index. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein the indication of the plurality of digital post-distortion kernels comprises, for each digital post-distortion kernel of the plurality of digital post-distortion kernels, an indication of one or more corresponding error vector magnitudes. ### Claim 12 (depends on 10) The apparatus of claim 10, wherein the instructions to transmit the downlink message are executable by the processor to cause the apparatus to: transmit the downlink message in accordance with a second modulation and coding scheme index that is different from the indicated modulation and coding scheme index based at least in part on a priority of the downlink message. ### Claim 13 (depends on 10) The apparatus of claim 10, wherein the instructions are further executable by the processor to cause the apparatus to: receive a capability message indicating a capability of a user equipment (UE) to perform adaptive digital post-distortion. ### Claim 14 (depends on 10) The apparatus of claim 10, wherein the instructions to transmit the indication of the plurality of digital post-distortion kernels are executable by the processor to cause the apparatus to: transmit a medium access control-control element or a radio resource control message indicating the plurality of digital post-distortion kernels. ### Claim 15 (depends on 10) The apparatus of claim 10, wherein the instructions are further executable by the processor to cause the apparatus to: perform a calibration procedure to obtain the plurality of post-distortion kernels associated with each of the one or more error vector magnitudes; and generate the plurality of digital post-distortion kernels and the one or more error vector magnitudes based at least in part on the calibration procedure. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the instructions to perform the calibration procedure are executable by the processor to cause the apparatus to: input a signal into one or more power amplifiers, wherein a transmission power of the signal is a same transmission power at which the network entity operates; generate a least square estimator based at least in part on the input signal, an output signal from the one or more power amplifiers, and one or more digital post-distortion kernels; calculate an output of the one or more power amplifiers in accordance with the least square estimator; and measure an error vector magnitude using the output signal and the output of the one or more power amplifiers. ### Claim 17 (depends on 15) The apparatus of claim 15, wherein the instructions are further executable by the processor to cause the apparatus to: select a digital post-distortion kernel corresponding to an error vector magnitude, wherein a size of the digital post-distortion kernel is less than a size of a second digital post-distortion kernel corresponding to the error vector magnitude. ### Claim 18 A method for wireless communications at a user equipment (UE), comprising: receiving an indication of a plurality of digital post-distortion kernels associated with a network entity, each digital post-distortion kernel associated with one or more error vector magnitudes; selecting a digital post-distortion kernel of the plurality of digital post-distortion kernels associated with the network entity based at least in part on a target error vector magnitude at the UE; transmitting an indication of a modulation and coding scheme index in accordance with the selected digital post-distortion kernel and the target error vector magnitude; and receiving a downlink message based at least in part on the selected digital post-distortion kernel and the indicated modulation and coding scheme index. ### Claim 19 (depends on 18) The method of claim 18, wherein selecting the digital post-distortion kernel comprises: selecting the target error vector magnitude from the one or more error vector magnitudes based at least in part on an error vector magnitude threshold. ### Claim 20 (depends on 19) The method of claim 19, wherein the error vector magnitude threshold is based at least in part on one or more of a modulation order, a modulation and coding scheme, a battery level of the UE, or any combination thereof. ### Claim 21 (depends on 18) The method of claim 18, further comprising: selecting the modulation and coding scheme index based at least in part on a signal-to-noise ratio associated with communications between the UE and the network entity, the indication of the plurality of digital post-distortion kernels, and a battery level the UE. ### Claim 22 (depends on 18) The method of claim 18, wherein the indication of the plurality of digital post-distortion kernels comprises, for each digital post-distortion kernel of the plurality of digital post-distortion kernels, an indication of one or more corresponding error vector magnitudes. ### Claim 23 (depends on 18) The method of claim 18, wherein receiving the downlink message comprises: receiving the downlink message in accordance with a second modulation and coding scheme index that is different from the indicated modulation and coding scheme index based at least in part on a priority of the downlink message. ### Claim 24 (depends on 18) The method of claim 18, further comprising: demodulating the downlink message based at least in part on the selected digital post-distortion kernel and the indicated modulation and coding scheme index. ### Claim 25 (depends on 18) The method of claim 18, further comprising: transmitting a capability message indicating a capability of the UE to perform adaptive digital post-distortion. ### Claim 26 (depends on 18) The method of claim 18, wherein receiving the indication of the plurality of digital post-distortion kernels comprises: receiving a medium access control-control element or a radio resource control message indicating the plurality of digital post-distortion kernels. ### Claim 27 A method for wireless communications at a network entity, comprising: transmitting an indication of a plurality of digital post distortion kernels associated with the network entity, each digital post-distortion kernel associated with one or more error vector magnitudes; receiving an indication of a modulation and coding scheme index in accordance with a digital post-distortion kernel of the plurality of digital post-distortion kernels and a target error vector magnitude; and transmitting a downlink message based at least in part on the modulation and coding scheme index. ### Claim 28 (depends on 27) The method of claim 27, wherein the indication of the plurality of digital post-distortion kernels comprises, for each digital post-distortion kernel of the plurality of digital post-distortion kernels, an indication of one or more corresponding error vector magnitudes. ### Claim 29 (depends on 27) The method of claim 27, wherein transmitting the downlink message comprises: transmitting the downlink message in accordance with a second modulation and coding scheme index that is different from the indicated modulation and coding scheme index based at least in part on a priority of the downlink message. ### Claim 30 (depends on 27) The method of claim 27, further comprising: receiving a capability message indicating a capability of a user equipment (UE) to perform adaptive digital post-distortion.