Improved demodulation reference signal for digital post-distortion assistance - Patents.com

Abstract

Methods, systems and devices for wireless communications are described. A first wireless device may identify a set of data resource elements for transmitting data in one or more symbol periods. The first wireless device may generate, for one or more symbol periods based on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, where the sequence of the set of pilot resource elements includes a demodulation reference signal. The first wireless device may transmit the set of data resource elements and the set of pilot resource elements to a second wireless device in one or more symbol periods. The second wireless device may decode a first subset of the set of pilot resource elements based on a second subset of the set of pilot resource elements to determine the demodulation reference signal.

Description

[Technical field]

[0001] cross reference This patent application claims the benefit of U.S. patent application Ser. No. 17 / 319,388, entitled “ENHANCED DEMODULATION REFERENCE SIGNAL FOR DIGITAL POST DISTORTION ASSIST” by KUTZ et al., filed May 13, 2021, and assigned to the assignee of this application.

[0002] The following relates to wireless communications, including an enhanced demodulation reference signal for digital post-distortion assistance. [Background technology]

[0003] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasts, and the like. These systems may be capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems, such as Long Term Evolution (LTE), LTE-Advanced (LTE-A), or LTE-A Pro systems, and fifth generation (5G) systems, sometimes referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM), etc. A wireless multiple-access communication system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be known as user equipment (UE), in some cases. Summary of the Invention [Means for solving the problem]

[0004] The described techniques relate to improved methods, systems, devices, and apparatuses that support improved demodulation reference signals for digital post-distortion assistance. In general, the described techniques enable a first wireless device (e.g., a base station or user equipment (UE)) to adjust (e.g., minimize or reduce to meet a threshold) a peak-to-average power ratio associated with a set of resource elements (e.g., a set of resource elements in a symbol period). For example, the first wireless device may identify a set of constellation points that may be mapped to a resource element or set of resource elements that includes a demodulation reference signal. The first wireless device may determine a 1st percentile peak value associated with each constellation point of the set of constellation points and may select a constellation point from the set whose 1st percentile peak value meets (e.g., is below, above) a threshold or has the lowest or highest 1st percentile peak value. The first wireless device may determine a sequence for the demodulation reference signal based on the selected constellation point and may transmit the demodulation reference signal to the second wireless device based on the determined sequence.

[0005] A method for wireless communication in a first wireless device is described. The method may include identifying a set of data resource elements for transmitting data in one or more symbol periods, generating, for one or more symbol periods based on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, where the sequence of the set of pilot resource elements includes a demodulation reference signal, and transmitting the set of data resource elements and the set of pilot resource elements associated with the set of data resource elements to a second wireless device in the one or more symbol periods.

[0006] An apparatus for wireless communication in a first wireless device is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to identify a set of data resource elements for transmitting data in one or more symbol periods, generate, for one or more symbol periods based at least in part on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, where the sequence of the set of pilot resource elements includes a demodulation reference signal, and transmit the set of data resource elements and the set of pilot resource elements associated with the set of data resource elements to a second wireless device in the one or more symbol periods.

[0007] Another apparatus for wireless communication in a first wireless device is described. The apparatus may include means for identifying a set of data resource elements for transmitting data in one or more symbol periods, means for generating, for one or more symbol periods based on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, the sequence of the set of pilot resource elements including a demodulation reference signal, and means for transmitting the set of data resource elements and the set of pilot resource elements associated with the set of data resource elements to a second wireless device in the one or more symbol periods.

[0008] A non-transitory computer-readable medium storing code for wireless communication at a first wireless device is described. The code may include instructions executable by a processor to identify a set of data resource elements for transmitting data in one or more symbol periods, generate, for one or more symbol periods based at least in part on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, where the sequence of the set of pilot resource elements includes a demodulation reference signal, and transmit the set of data resource elements and the set of pilot resource elements associated with the set of data resource elements to a second wireless device in the one or more symbol periods.

[0009] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting, to a second wireless device, an indication of a first subset of the set of pilot resource elements, where the first subset of the set of pilot resource elements does not include at least one pilot resource element of the set of pilot resource elements, and where transmitting the set of pilot resource elements may be based on transmitting the indication of the first subset of the set of pilot resource elements.

[0010] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting an indication of the first subset of the set of pilot resource elements may include operations, features, means, or instructions for transmitting configuration signaling that identifies the first subset of the set of pilot resource elements.

[0011] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the configuration signaling specifying a first subset of the set of pilot resource elements may include an operation, feature, means, or instruction for transmitting a demodulation reference signal configuration specifying the first subset of the set of pilot resource elements.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a first subset of the set of pilot resource elements that does not include a second subset of the set of pilot resource elements, and transmitting the set of pilot resource elements may be based on identifying the first subset of the set of pilot resource elements.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, generating a sequence may include acts, features, means, or instructions for selecting a sequence from a set of sequences, and transmitting the set of pilot resource elements may be based on selecting a sequence from the set of sequences.

[0014] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a sequence may be selected from a set of sequences based on a measure of the sequence satisfying a threshold.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the measure includes a percentile peak value and meeting the threshold includes the percentile peak value being above the threshold.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, each sequence in a set of sequence candidates may have an associated value of the measure, and a sequence may be selected from the set of sequences based on the sequence's associated value of the measure having the lowest value or the highest value compared to the values ​​of the measure of each of the other sequences in the set of sequence candidates.

[0017] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for modulating each pilot resource element of the set of pilot resource elements using quadrature phase shift keying, and transmitting the set of pilot resource elements may be based on the modulating.

[0018] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a set of constellation points associated with a pilot resource element of the set of pilot resource elements, determining a value of the measure for the pilot resource element for each constellation point of the set of constellation points, and selecting a constellation point from the set of constellation points based on determining the value of the measure for each constellation point of the set of constellation points for the pilot resource element, and transmitting the set of pilot resource elements may be based on selecting the constellation point.

[0019] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a second set of constellation points associated with a second pilot resource element of the set of pilot resource elements, determining a second value of the measure for each constellation point of the second set of constellation points for the second pilot resource element, and selecting a second constellation point of the second set of constellation points based on determining the second value of the measure for each constellation point of the second set of constellation points for the second pilot resource element, and transmitting the set of pilot resource elements may be based on selecting the second constellation point.

[0020] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a first subset of the set of pilot resource elements that does not include a second subset of the set of pilot resource elements, where the second subset of the set of pilot resource elements includes the first pilot resource element and the second pilot resource element.

[0021] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for selecting, for each pilot resource element of the second subset of the set of pilot resource elements, a respective constellation point of the respective set of constellation points based on determining a respective value of the measure for each constellation point of the respective set of constellation points, and transmitting the set of pilot resource elements may be based on selecting the respective constellation point for each pilot resource element of the second subset of the set of pilot resource elements.

[0022] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for refraining from determining a respective value of the measure for each pilot resource element of a first subset of the set of pilot resource elements, and transmitting the set of pilot resource elements may be based on the refraining.

[0023] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting a constellation point may include operations, features, means, or instructions for determining, for each constellation point of the set of constellation points, a percentile peak value over a symbol period that overlaps in time with the first pilot resource element, and selecting a first constellation point of the set of constellation points associated with a higher percentile peak value than a percentile peak value of a second constellation point of the set of constellation points.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first constellation point may be associated with a highest percentile peak of each constellation point in the set of constellation points.

[0025] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a number of constellation points associated with performing quadrature amplitude modulation on data resource elements of the set of data resource elements, and generating the sequence may be based on the number of constellation points exceeding a threshold.

[0026] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, generating the sequence may include operations, features, means, or instructions for identifying a set of constellation points for each pilot resource element of the set of pilot resource elements; generating a set of multiple sequences of constellation points, where each sequence of constellation points includes one constellation point from a respective set of constellation points for the set of pilot resource elements; determining a value of the measure for each sequence of constellation points of the multiple sequences of constellation points; and selecting a sequence of constellation points from the multiple sequences of constellation points based on determining the value of the measure for each constellation point of the set of constellation points for the set of pilot resource elements, and transmitting the set of pilot resource elements may be based on selecting the sequence of constellation points.

[0027] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the measure includes a percentile peak value.

[0028] A method for wireless communication in a second wireless device is described. The method may include receiving a set of data resource elements and a set of pilot resource elements from a first wireless device in one or more symbol periods, the set of data resource elements including a demodulation reference signal associated with the set of data resource elements, decoding a second subset of the set of pilot resource elements based on a first subset of the set of pilot resource elements to determine a demodulation reference signal associated with the set of data resource elements, and performing a digital post-distortion procedure on the received set of data resource elements based on the determined demodulation reference signal.

[0029] An apparatus for wireless communication in a second wireless device is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive a set of data resource elements and a set of pilot resource elements from a first wireless device in one or more symbol periods, the set of data resource elements including a demodulation reference signal associated with the set of data resource elements, decode a second subset of the set of pilot resource elements based on a first subset of the set of pilot resource elements to determine a demodulation reference signal associated with the set of data resource elements, and perform a digital post-distortion procedure on the received set of data resource elements based on the determined demodulation reference signal.

[0030] Another apparatus for wireless communication in a second wireless device is described. The apparatus may include means for receiving a set of data resource elements and a set of pilot resource elements from a first wireless device in one or more symbol periods, the set of data resource elements including a demodulation reference signal associated with the set of data resource elements, means for decoding a second subset of the set of pilot resource elements based on a first subset of the set of pilot resource elements to determine a demodulation reference signal associated with the set of data resource elements, and means for performing a digital post-distortion procedure on the received set of data resource elements based on the determined demodulation reference signal.

[0031] A non-transitory computer-readable medium storing code for wireless communication at a second wireless device is described. The code may include instructions executable by a processor to receive from a first wireless device in one or more symbol periods a set of data resource elements including a demodulation reference signal associated with the set of data resource elements and a set of pilot resource elements, decode a second subset of the set of pilot resource elements based on a first subset of the set of pilot resource elements to determine a demodulation reference signal associated with the set of data resource elements, and perform a digital post-distortion procedure on the received set of data resource elements based on the determined demodulation reference signal.

[0032] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, each pilot resource element of a set of pilot resource elements may be modulated according to quadrature phase shift keying.

[0033] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving, from the first wireless device, an indication of a configuration of the set of pilot resource elements, where receiving the set of pilot resource elements may be based on the indicated configuration of the set of pilot resource elements.

[0034] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a first subset of the set of pilot resource elements that does not include a second subset of the set of pilot resource elements, and decoding the second subset of the set of pilot resource elements may be based on identifying the first subset of the set of pilot resource elements.

[0035] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving a set of pilot resource elements based on the set of pilot resource elements being associated with a metric that satisfies a threshold.

[0036] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the metric includes a percentile peak value, and the metric meeting a threshold includes the percentile peak value exceeding the threshold. [Brief description of the drawings]

[0037] [Figure 1] FIG. 1 illustrates an example of a wireless communication system supporting an improved demodulation reference signal for digital post-distortion assistance, according to an aspect of the present disclosure. [Diagram 2] FIG. 1 illustrates an example of a wireless communication system supporting an improved demodulation reference signal for digital post-distortion assistance, according to an aspect of the present disclosure. [Diagram 3] FIG. 1 illustrates an example of a communications block diagram supporting an improved demodulation reference signal for digital post-distortion assistance, according to an aspect of the present disclosure. [Figure 4] FIG. 1 illustrates an example process flow for supporting an improved demodulation reference signal for digital post-distortion assistance, according to an aspect of the present disclosure. [Diagram 5] FIG. 1 is a block diagram of a device supporting an improved demodulation reference signal for digital post-distortion assistance in accordance with an aspect of the present disclosure. [Figure 6] FIG. 1 is a block diagram of a device supporting an improved demodulation reference signal for digital post-distortion assistance in accordance with an aspect of the present disclosure. [Figure 7] FIG. 1 is a block diagram of a communications manager supporting an improved demodulation reference signal for digital post-distortion assistance, according to an aspect of the disclosure. [Figure 8]FIG. 1 is a diagram of a system including a device that supports an improved demodulation reference signal for digital post-distortion assistance, according to an aspect of the present disclosure. [Figure 9] FIG. 1 is a block diagram of a device supporting an improved demodulation reference signal for digital post-distortion assistance in accordance with an aspect of the present disclosure. [Figure 10] FIG. 1 is a block diagram of a device supporting an improved demodulation reference signal for digital post-distortion assistance in accordance with an aspect of the present disclosure. [Figure 11] FIG. 1 is a block diagram of a communications manager supporting an improved demodulation reference signal for digital post-distortion assistance, according to an aspect of the disclosure. [Figure 12] FIG. 1 is a diagram of a system including a device that supports an improved demodulation reference signal for digital post-distortion assistance, according to an aspect of the present disclosure. [Figure 13] 1 is a flowchart illustrating a method for supporting an improved demodulation reference signal for digital post-distortion assistance, according to an aspect of the present disclosure. [Figure 14] 1 is a flowchart illustrating a method for supporting an improved demodulation reference signal for digital post-distortion assistance, according to an aspect of the present disclosure. [Figure 15] 1 is a flowchart illustrating a method for supporting an improved demodulation reference signal for digital post-distortion assistance, according to an aspect of the present disclosure. [Figure 16] 1 is a flowchart illustrating a method for supporting an improved demodulation reference signal for digital post-distortion assistance, according to an aspect of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] A transmitting device may communicate with a receiving device. For example, the transmitting device may transmit a signal including a set of pilot resource elements (e.g., pilot symbols) and a set of data resource elements (e.g., data symbols) to the receiving device. The set of pilot resource elements may include a demodulation reference signal (DMRS). In such an example, the set of pilot resource elements may be referred to as a DMRS resource element (e.g., a DMRS symbol). The set of data resource elements may include data that the transmitting device is communicating to the receiving device.

[0039] In some examples, a receiving device may perform digital post distortion (DPOD), which may be a technique that allows the receiving device to compensate for transmission nonlinearities caused by a power amplifier (PA) of the transmitting device when the receiving device receives a transmission from the transmitting device. Performing DPOD may include the receiving device estimating a PA nonlinearity model using a set of DMRS resource elements (e.g., using an orthogonal frequency division multiplexing (OFDM) symbol that includes the DMRS resource elements) and the receiving device using the estimated PA nonlinearity model to apply the model to a set of data resource elements and / or phase tracking reference signal (PTRS) resource elements (e.g., to OFDM symbols that do not include DMRS resource elements). The closer a nonlinearity associated with a set of DMRS resource elements (e.g., or symbols that include DMRS resource elements) is to a nonlinearity associated with a set of data resource elements and / or a set of PTRS resource elements (e.g., or symbols that do not include DMRS resource elements), the more accurately the receiving device may be able to compensate for transmission nonlinearities, e.g., as part of a DPoD procedure.

[0040] This disclosure describes techniques that may enable a transmitting device to adjust a 1st percentile peak value associated with an OFDM symbol that includes a pilot resource element (e.g., a set of DMRS resource elements) such that the nonlinearity associated with the OFDM symbol more closely resembles the nonlinearity associated with an OFDM symbol that does not include a DMRS resource element (e.g., a symbol that includes a PTRS resource element or a data resource element). For example, for a pilot resource element of a set of pilot resource elements in an OFDM symbol, the transmitting device may identify a set of constellation points that may be mapped to the pilot resource element. The transmitting device may determine a 1st percentile peak value associated with modulating the DMRS resource element according to one or more of the constellation points and may select a constellation point associated with a 1st percentile peak value above a threshold or the highest (e.g., maximum) 1st percentile peak value for one or more constellation points. The transmitting device may modulate the pilot resource element according to the selected constellation point. By selecting a 1st percentile peak above a threshold or the highest 1st percentile peak value for a pilot resource element, the pilot resource element may have a higher 1st percentile peak value compared to the set of data resource elements, and the OFDM symbol including the DMRS resource element may be associated with a higher 1st percentile peak. Thus, the transmitting device may adjust the 1st percentile peak value of the OFDM symbol including the pilot resource element, thus enabling the receiving device to more accurately compensate for transmission nonlinearities.

[0041] Aspects of the present disclosure are first described in the context of a wireless communication system. Additional aspects of the present disclosure are described in the context of communication block diagrams and process flows. Aspects of the present disclosure are further shown and described with reference to apparatus diagrams, system diagrams, and flow charts relating to an improved demodulation reference signal for digital post-distortion assistance.

[0042] FIG. 1 illustrates an example of a wireless communication system 100 supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0043] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100 and may be devices of different forms or with different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support communication of signals according to one or more radio access technologies.

[0044] The UEs 115 may be distributed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be fixed or mobile or both at different times. The UEs 115 may be devices of different forms or with different capabilities. Some example UEs 115 are shown in FIG. 1. The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment) as shown in FIG. 1.

[0045] The base stations 105 may communicate with the core network 130, with each other, or both. For example, the base stations 105 may interface with the core network 130 through one or more backhaul links 120 (e.g., via an S1, N2, N3, or other interface). The base stations 105 may communicate with each other through the backhaul links 120 (e.g., via an X2, Xn, or other interface), either directly (e.g., directly between the base stations 105), or indirectly (e.g., via the core network 130), or both. In some examples, the backhaul links 120 may be or include one or more wireless links.

[0046] One or more of the base stations 105 described herein may include or be referred to as a base transceiver station, wireless base station, access point, wireless transceiver, NodeB, eNodeB (eNB), next generation NodeB or giga-NodeB (any of which may be referred to as a gNB), Home NodeB, Home eNodeB, or other suitable terminology by one skilled in the art.

[0047] The UE 115 may include or be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or any other suitable terminology, and a "device" may be referred to as a unit, a station, a terminal, or a client, among other things. The UE 115 may also include or be referred to as a personal electronic device, such as a mobile phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, the UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other things, which may be implemented in various articles, such as an appliance, or a vehicle, a meter, among other things.

[0048] The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115 that may act as relays, as shown in FIG. 1, as well as base stations 105 and network equipment, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among others.

[0049] The UE 115 and the base station 105 may wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure to support the communication link 125. For example, a carrier used for the communication link 125 may include a portion (e.g., a bandwidth portion (BWP)) of a radio frequency spectrum band that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry collection signaling (e.g., synchronization signals, system information), control signaling that coordinates operation on the carrier, user data, or other signaling. The wireless communication system 100 may support communication with the UE 115 using carrier aggregation or multi-carrier operation. The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation can be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers.

[0050] A signal waveform transmitted on a carrier may be composed of multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may consist of one symbol period (e.g., the time length of one modulation symbol) and one subcarrier, where the symbol period and the subcarrier spacing are inversely proportional. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Thus, the more resource elements the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate of the UE 115 may be. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase data rates or data integrity for communications with UE 115.

[0051] The time interval for the base station 105 or the UE 115 may be, for example, T s =1 / (Δf max N f ) seconds, where Δf max may represent the maximum supported subcarrier spacing, and N f may represent the maximum discrete Fourier transform (DFT) size supported. The communication resource time intervals may be organized according to radio frames, each having a specified time length (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0052] Each frame may include multiple consecutively numbered subframes or slots, and each subframe or slot may have the same time length. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into several slots. Alternatively, each frame may include a variable number of slots, and the number of slots may depend on the subcarrier spacing. Each slot may include several symbol periods (e.g., depending on the length of a cyclic prefix prepended to each symbol period). In some wireless communications systems 100, a slot may be further divided into multiple minislots containing one or more symbols. Excluding the cyclic prefix, each symbol period may include one or more (e.g., N f The time length of a symbol period may depend on the subcarrier spacing or the frequency band of operation.

[0053] A subframe, slot, minislot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI length (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in a burst of shortened TTIs (sTTIs)).

[0054] The physical channels may be multiplexed on the carriers according to various techniques. The physical control channels and the physical data channels may be multiplexed on the downlink carriers using, for example, one or more of a time division multiplexing (TDM), a frequency division multiplexing (FDM), or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) for the physical control channels may be defined by a number of symbol periods and may extend across the system bandwidth of the carrier or a subset of the system bandwidth. One or more control regions (e.g., CORESET) may be configured for a set of UEs 115. For example, one or more of the UEs 115 may monitor or search the control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels configured in a cascaded manner. The aggregation level for a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to multiple UEs 115 and a UE-specific search space set for transmitting control information to a specific UE 115.

[0055] In some examples, the base stations 105 may be mobile and therefore provide communication coverage to moving geographic coverage areas 110. In some examples, the different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include a heterogeneous network, for example, where different types of base stations 105 provide coverage to various geographic coverage areas 110 using the same or different radio access technologies.

[0056] The wireless communication system 100 may be configured to support ultra-reliable or low latency communications, or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low latency communications (URLLC) or mission-critical communications. The UEs 115 may be designed to support ultra-reliable, low latency, or critical functions (e.g., mission-critical functionality). Ultra-reliable communications may include private or group communications and may be supported by one or more mission-critical services, such as mission critical push-to-talk (MCPTT), mission critical video (MCVideo), or mission critical data (MCData). Support for mission-critical functionality may include service prioritization, and the mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low latency, mission-critical, and ultra-reliable low latency may be used interchangeably herein.

[0057] In some examples, the UE 115 may also be able to communicate directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) protocol or a D2D protocol). One or more UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or may not be able to receive transmissions from the base station 105 in some examples. In some examples, a group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system in which each UE 115 transmits to every other UE 115 in the group. In some examples, the base station 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication occurs between UEs 115 without the involvement of the base station 105.

[0058] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) that manages access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) that routes packets or interconnects to external networks. The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the core network 130. User IP packets may be forwarded through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to one or more network operators' IP services 150. The IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0059] Some of the network devices, such as the base station 105, may include subcomponents, such as an access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with the UE 115 through one or more other access network transmitting entities 145, which may be referred to as a radio head, a smart radio head, or a transmit / receive point (TRP). Each access network transmitting entity 145 may include one or more antenna panels. In some configurations, various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or integrated into a single network device (e.g., the base station 105).

[0060] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). The 300 MHz to 3 GHz region is commonly referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter in length. Although UHF waves may be blocked or redirected by buildings and environmental features, the waves may penetrate structures sufficiently for a macrocell to serve UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers) compared to transmissions using lower frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0061] The wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ License Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band, such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in an unlicensed radio frequency spectrum band, devices such as the base station 105 and the UE 115 may utilize carrier sensing for collision detection and avoidance. In some examples, operation in an unlicensed band may be based on a carrier aggregation configuration in conjunction with a component carrier operating in a licensed band (e.g., LAA). Operation in an unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

[0062] The base station 105 or UE 115 may be equipped with multiple antennas that may be used to utilize techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located in one or more antenna arrays or antenna panels that may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be collocated in an antenna assembly such as an antenna tower. In some examples, antennas or antenna arrays associated with the base station 105 may be located in diverse geographic locations. The base station 105 may have an antenna array with several rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panels may support radio frequency beamforming for signals transmitted through the antenna ports.

[0063] Beamforming, sometimes referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used in a transmitting or receiving device (e.g., base station 105, UE 115) to shape or steer an antenna beam (e.g., transmit beam, receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated through antenna elements of an antenna array such that some signals propagating in a particular orientation relative to the antenna array are subject to constructive interference and other signals are subject to destructive interference. Adjustment of signals communicated through antenna elements may include the transmitting or receiving device applying an amplitude offset, a phase offset, or both to signals conveyed through an antenna element associated with the device. The adjustment associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., relative to the transmitting or receiving device's antenna array or to some other orientation).

[0064] A transmitting device (e.g., UE 115, base station 105) may communicate with a receiving device (e.g., UE 115, base station 105). For example, the transmitting device may transmit a signal including a set of pilot resource elements (e.g., pilot symbols) and a set of data resource elements (e.g., data symbols) to the receiving device. The set of pilot resource elements may include a demodulation reference signal (DMRS). In such an example, the set of pilot resource elements may be referred to as a DMRS resource element (e.g., DMRS symbol). The set of data resource elements may include data that the transmitting device is communicating to the receiving device. The receiving device may use the PTRS to track and account for phase noise that occurs during communication.

[0065] In some examples, a receiving device may perform DPoD, which may be a technique that allows the receiving device to compensate for transmission nonlinearities caused by the PA of the transmitting device when the receiving device receives a transmission from the transmitting device. Performing DPoD may include the receiving device estimating a PA nonlinearity model using a set of DMRS resource elements (e.g., using OFDM symbols that include DMRS resource elements) and the receiving device using the estimated PA nonlinearity model to apply the model to a set of data resource elements and / or PTRS resource elements (e.g., to OFDM symbols that do not include DMRS resource elements). The closer the nonlinearity associated with the set of DMRS resource elements (e.g., or symbols that include DMRS resource elements) is to the nonlinearity associated with the set of data resource elements and / or the set of PTRS resource elements (e.g., or symbols that do not include DMRS resource elements), the more accurately the receiving device may be able to compensate for the transmission nonlinearities, e.g., as part of a DPoD procedure.

[0066] This disclosure describes techniques that may enable a transmitting device to adjust a 1st percentile peak value associated with an OFDM symbol that includes a pilot resource element (e.g., a set of DMRS resource elements) such that the nonlinearity associated with the OFDM symbol more closely resembles the nonlinearity associated with an OFDM symbol that does not include a DMRS resource element (e.g., a symbol that includes a PTRS resource element or a data resource element). For example, for a pilot resource element of a set of pilot resource elements in an OFDM symbol, the transmitting device may identify a set of constellation points that may be mapped to the pilot resource element. The transmitting device may determine a 1st percentile peak value associated with modulating the DMRS resource element according to one or more of the constellation points and may select a constellation point associated with a 1st percentile peak value above a threshold or the highest (e.g., maximum) 1st percentile peak value for one or more constellation points. The transmitting device may modulate the pilot resource element according to the selected constellation point. By selecting a 1st percentile peak above a threshold or the highest 1st percentile peak value for a pilot resource element, the pilot resource element may have a higher 1st percentile peak value compared to the set of data resource elements, and the OFDM symbol including the DMRS resource element may be associated with a higher 1st percentile peak. Thus, the transmitting device may adjust the 1st percentile peak value of the OFDM symbol including the pilot resource element, thus allowing the transmitting device to more accurately compensate for transmission nonlinearities.

[0067] 2 illustrates an example of a wireless communication system 200 supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. For example, a first device 205 and a second device 210 may each be an example of a UE 115 or a base station 105 as described with reference to FIG. 1. The first device 205 (e.g., a first wireless device that may be referred to as a transmitting device) may communicate with a second device 210 (e.g., a first wireless device that may be referred to as a receiving device). For example, the first device 205 may transmit a transmission 215 to the second device 210 over a channel 220. In some examples, the second device 210 may be within the geographic coverage area 110 of the first device 205.

[0068] In some examples, the transmission 215 may be an example of a data transmission. The transmitting device may reserve resources for the data transmission. The resources reserved for the data transmission may include one or more resource elements 222. Each resource element may span a time unit 225 (e.g., a symbol period, an OFDM symbol) and a frequency unit 230 (e.g., a subcarrier). A first set of resource elements may be data resource elements (e.g., data resource elements) and a second set of resource elements may be DMRS resource elements 235. In some examples, the DMRS resource elements 235 may include a DMRS. The other resource elements 240 may correspond to data resource elements and / or phase tracking reference signal (PTRS) resource elements.

[0069] The DMRS resource element 235 may include a DMRS. In some examples, the DMRS may be or may be referred to as an enhanced DMRS (eDMRS). The eDMRS may have one of multiple possible waveforms (e.g., the eDMRS may not be a predefined unique sequence). The waveform selected for the eDMRS may have the highest or lowest value of one or more criteria. When the first device 205 transmits the eDMRS to the second device 210 (e.g., via one or more of the sets of DMRS resource elements 235), the second device 210 may decode (e.g., blind decode) the eDMRS pattern and extract information embedded therein. After the second device 210 performs the decoding, the second device 210 may identify the eDMRS sequence. Thus, the second device 210 may use the eDMRS for channel estimation.

[0070] In some examples, the second device 210 may perform DPoD. DPoD may be a technique that may enable the first device 205 to transmit near (e.g., within a threshold therefrom) a compression point of the PA for the first device 205 and / or allow the second device 210 to compensate for transmission nonlinearities caused by the PA of the second device 210 when the second device 210 receives a transmission from the first device 205. Performing DPoD may enable the first device 205 to transmit at a higher power and may improve signal to noise ratio (SNR) and / or capacity compared to other techniques. Performing DPoD may also enable the first device 205 to transmit with a lower error vector magnitude (EVM) when performing quadrature amplitude modulation (QAM) (e.g., superQAM, which may include 1024QAM and higher) or other modulation techniques having a larger constellation size (e.g., greater than 1024 points) than other techniques. The lower EVM may enable the first device 205 to use a smaller PA backoff, which may increase the range of communication. Thus, performing DPoD may enable improved communication efficiency.

[0071] DPoD techniques may include modeling the nonlinear impairments as additive signals, estimating the nonlinear impairments, and subtracting the nonlinear impairments from the received signal (e.g., through an iterative process). For example, DPoD may include two stages. The first stage may include estimating a PA nonlinearity model, which may be performed for a set of DMRS resource elements 235 (e.g., or a set of OFDM symbols that include DMRS resource elements). The second phase may include removing the nonlinear impairments from each data resource element of the other resource elements 240 using the estimated PA nonlinearity model (e.g., or OFDM symbols that do not include DMRS resource elements and / or that include data resource elements). In some examples, the nonlinearity may be data dependent and may vary from data resource element to data resource element. In some examples, the nonlinearity may be based on the distribution of symbol time-domain signal peaks and the overall signal peak to average power ratio (PAPR). For example, a lower signal 1st percentile peak value (eg, at least 1% of the samples having a higher amplitude) may decrease the nonlinearity, and a higher 1st percentile peak value may increase the nonlinearity.

[0072] In some examples, the 1st percentile peak value may be different (e.g., vary) between DMRS resource elements 235 and data resource elements, and / or between OFDM symbols including DMRS resource elements 235 and OFDM symbols not including DMRS resource elements. Due to the different 1st percentile peak values, data resource elements (e.g., or OFDM symbols not including DMRS resource elements 235 and / or including data resource elements) may exhibit higher nonlinearity than DMRS resource elements 235 (e.g., or OFDM symbols including DMRS resource elements 235). Thus, a PA model mismatch may occur between estimating a PA model using DMRS resource elements 235 (e.g., or OFDM symbols including DMRS resource elements 235) and applying the PA model to data resource elements (e.g., or OFDM symbols not including DMRS resource elements 235 and / or including data resource elements). Thus, the implementation of DPoD may exhibit error floor behavior.

[0073] This disclosure may relate to ways in which nonlinearity of a DMRS resource element 235 (e.g., or of an OFDM symbol that includes the DMRS resource element 235) may be increased using eDMRS. For example, the 1st percentile peak value of the DMRS resource element 235 may be increased (e.g., in a manner that does not affect the EVM or has a small effect on the EVM, e.g., the effect is less than a threshold). By increasing the 1st percentile peak value in this manner, model mismatch may be reduced, e.g., reduced below a threshold level or eliminated, and DPoD performance may be improved. Additionally or alternatively, the probability of model mismatch may be lowered, which may improve rate-over-range.

[0074] In some examples, the 1st percentile peak value of an OFDM symbol that includes a DMRS resource element 235 may be increased by transmitting a quadrature phase shift keying (QPSK) signal in some or each of the DMRS resource elements 235. In some examples, the first device 205 may identify a set of QPSK constellation points (e.g., (00), (01), (10), and (11)) and may determine a 1st percentile peak value associated with each constellation point. For example, in the current example of a particular DMRS resource element 235, the first device 205 may determine that constellation point (01) is associated with the lowest 1st percentile peak value for the OFDM symbol, constellation point (11) is associated with the next lowest 1st percentile peak value for the OFDM symbol, constellation point (10) is associated with the next lowest 1st percentile peak value for the OFDM symbol, and constellation point (00) is associated with the highest 1st percentile peak value for the OFDM symbol. After determining the PAPR associated with each constellation point, the first device 205 may select a constellation point associated with a 1st percentile peak value above a threshold or the constellation point with the highest 1st percentile peak value for the OFDM symbol. In this example, the first device 205 may select constellation point (00) if constellation point (00) has the highest 1st percentile peak value. After selecting the constellation point, the first device 205 may modulate the DMRS resource element 235 according to the selected constellation point.

[0075] In some examples, the first device 205 may determine the constellation points using a sequential greedy method. For example, in one example, an OFDM symbol may include N DMRS resource elements 235, which may be numbered from 1 to N. In a first iteration of the sequential greedy method, a 1st percentile peak value may be calculated for the first DMRS resource element 235 by assuming that each of the other N-1 DMRS resource elements 235 has a value of 0 (e.g., carries no signal). The first device 205 may calculate a 1st percentile peak value for each hypothesis (e.g., four hypotheses) obtained by modulating the first DMRS resource element 235 according to each possible constellation point value of the set of constellation points. The first device 205 may select the best 1st percentile peak value (e.g., highest PAPR) and may set (e.g., fix) the value of the DMRS resource element 235 to the constellation point corresponding to the best DMRS value. In the mth iteration of the method, a 1st percentile peak value may be calculated for the mth DMRS resource element 235 by assuming that each of the previous DMRS resource elements 235 (e.g., 1 to m-1) was modulated according to a previously selected constellation point and each of the subsequent DMRS resource elements 235 (e.g., m+1 to N) has a value of 0 (e.g., carries no signal). As with the first DMRS resource element 235, the first device 205 may calculate each hypothetical 1st percentile peak value obtained by modulating the mth DMRS resource element 235 according to each possible constellation point value of the set of constellation points. The first device 205 may select the best 1st percentile peak value (e.g., the highest 1st percentile peak value) and may set (e.g., fix) the value of the DMRS resource element 235 to the constellation point corresponding to the best 1st percentile peak value. In some examples, the first device 205 may repeat the method for some or each other DMRS resource element 235.In this manner, the first device 205 may determine a sequence for one or more eDMRS associated with the DMRS resource element 235. In some examples, the successive greedy method may be performed offline, which may reduce complexity (e.g., computational complexity) at the first device 205.

[0076] In some examples, a certain percentage x% (e.g., 25%) of the DMRS resource elements 235 may be kept constant to enable the initial channel estimated for detection of the remainder of the eDMRS. The remaining percentage (100%-x%) may be used to raise the 1st percentile of the peak. In some examples, the eDMRS resource elements in the reserved tones may be constrained to be used for QPSK modulation, which may enable more reliable detection of the signal and may enable the use of the eDMRS sequence for channel estimation. Additionally or alternatively, the process of determining the QPSK symbols may be predefined (e.g., may be performed offline), which may lower the complexity (e.g., computational complexity) for the first device 205 or the second device 210. In such an option, no prior DMRS decoding by the second device 210 may occur. However, the first device 205 may send signaling to the second device 210 informing the second device 210 of the DMRS to be used (e.g., the DMRS sequence to be used).

[0077] Although this method is described for raising the 1st percentile peak value, there may be examples where the method may be used to lower the 1st percentile peak value. For example, if the nonlinearity associated with the DMRS resource element 235 (e.g., or the OFDM symbol that includes the DMRS resource element 235) is higher than the associated data resource element (e.g., or the OFDM symbol that includes the data resource element), the method may instead be used to lower the 1st percentile peak value associated with the DMRS resource element 235 (e.g., associated with the OFDM symbol that includes the DMRS resource element 235). Additionally or alternatively, it should be noted that although examples are described herein with respect to the 1st percentile peak value, there may be examples where the method may use a peak-to-average power ratio (PAPR) instead of or in addition to the 1st percentile peak value. For example, the constellation point selected may be the constellation point with the lowest or highest PAPR value associated with the OFDM symbol that includes the DMRS resource element 235.

[0078] In some examples, the methods as described herein may be associated with one or more advantages. For example, adjusting the 1st percentile peak value of the DMRS resource elements 235 may reduce the probability that a PA mismatch may occur. In some examples, the first device 205 may use a smaller PA backoff and / or may increase the range of communication.

[0079] FIG. 3 illustrates an example of a communication diagram 300 supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. In some examples, the communication diagram 300 may implement one or more aspects of the wireless communication systems 100 and / or 200. For example, the first device 205-a may be an example of the first device 205 as described with reference to FIG. 2, and the second device 210-a may be an example of the second device 210 as described with reference to FIG. 2. Additionally or alternatively, each of the first device 205-a and the second device 210-a may be an example of a base station 105 or a UE 115. In some examples, each or part of the methods described herein may be performed by a controller (e.g., the controller 310 or the controller 340 as described herein).

[0080] Initially, the first device 205-a may determine that it has data to transmit to the second device 210-a. The first device 205-a may modulate a DMRS (e.g., eDMRS) according to QPSK modulation (e.g., using the DMRS QPSK modulator 305). Modulating the DMRS may include the DMRS QPSK modulator 305 and / or the controller 310 determining a constellation point associated with a highest 1st percentile peak value or a 1st percentile peak value below a threshold for each of a set of DMRS resource elements and performing QPSK modulation according to each determined constellation point. The data encoder 315 may encode the data, and the data modulator 320 may modulate the data.

[0081] After performing modulation for the data and DMRS, the resource mapper 325 may map the modulated DMRS to a respective DMRS resource element and map the data to one or more data resource elements. After the resource mapper 325 performs the mapping, the first device 205-a may transmit a signal including the modulated DMRS and data to the second device 210-a.

[0082] The second device 210-a may receive the signal and may perform demapping on the signal. For example, the resource demapper 330 may identify resources corresponding to the modulated DMRS (e.g., DMRS resource elements) and data (e.g., data resource elements) and may demap the resources. The DMRS QPSK demodulator 335 may demodulate the modulated DMRS. In some examples, the controller 340 may perform the demodulation.

[0083] The second device 210-a may also demodulate the data via the data demodulator 345 and decode the data via the data decoder 350. In some examples, the data demodulator 345 may use the demodulated DMRS for data demodulation. For example, the second device 210-a may estimate phase noise using the demodulated DMRS, and the data demodulator 345 may perform data demodulation using the estimated phase noise.

[0084] 4 illustrates an example of a process flow 400 for supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. The process flow 400 may be implemented by one or more aspects of the wireless communications systems 100 and / or 200. For example, the first device 205-b may be an example of the first device 205 as described with reference to FIG. 2, and the second device 210-b may be an example of the second device 210 as described with reference to FIG. 2. Additionally or alternatively, each of the first device 205-b and the second device 210-b may be an example of a base station 105 or a UE 115.

[0085] At 405, the first device 205-b may identify a set of resource elements for transmitting data in one or more symbol periods.

[0086] At 410, the first device 205-b may generate a sequence of a set of pilot resource elements associated with the set of data resource elements for one or more symbol periods based on the set of data resource elements, the sequence of the set of pilot resource elements including a DMRS. In some examples, generating a sequence may include selecting a sequence from a set of sequence candidates. In some examples, a sequence is selected from the set of sequence candidates based on a measure of the set of pilot resource elements and / or the set of data resource elements for the one or more symbol periods satisfying a threshold. The measure may include a percentile peak value, and satisfying the threshold may include the percentile peak value being above the threshold. Additionally or alternatively, the measure may have a set of values ​​including a value for each sequence of the set of sequence candidates. In such examples, a sequence may be selected from the set of sequence candidates based on a measure associated with the sequence having a lowest value or a highest value of the set of values.

[0087] In some examples, generating the sequence may include selecting a sequence from a set of sequences, and transmitting the set of pilot resource elements is based on selecting a sequence from the set of sequences. In some examples, a sequence may be selected from the set of sequences based on a metric for the sequence satisfying a threshold. In some examples, the metric may include a percentile peak value, and satisfying the threshold may include the percentile peak value being above the threshold. In some examples, each sequence in the set of sequence candidates may have an associated value of the metric, and a sequence may be selected from the set of sequences based on the associated value of the metric for the sequence having a lowest value or a highest value as compared to the values ​​of the metric for each of the other sequences in the set of sequence candidates.

[0088] In some examples, generating the sequence may include identifying a set of constellation points associated with a pilot resource element of the set of pilot resource elements, determining a value of the measure for the pilot resource element for each constellation point of the set of constellation points, and selecting, for the pilot resource element, a constellation point from the set of constellation points based on determining the value of the measure for each constellation point of the set of constellation points. In some examples, generating the sequence includes identifying a set of constellation points associated with a second pilot resource element of the set of pilot resource elements, determining a second value of the measure for the second pilot resource element for each constellation point of the second set of constellation points, and selecting, for the second pilot resource element, a second constellation point from the second set of constellation points based on determining the second value of the measure for each constellation point of the second set of constellation points.

[0089] In some examples, the first device 205-b may identify a first subset of the set of pilot resource elements that does not include the second subset of the set of pilot resource elements, the second subset of the set of pilot resource elements including the first pilot resource element and the second pilot resource element. In some examples, the first device 205-b may select a respective constellation point of the respective set of constellation points based on determining a respective value of the measure for each constellation point of the respective set of constellation points for each pilot resource element of the second subset of the set of pilot resource elements, and transmitting the set of pilot resource elements is based at least in part on selecting a respective constellation point for each pilot resource element of the second subset of the set of pilot resource elements. In some examples, the first device 205-b may refrain from determining a respective value of the measure for each pilot resource element of the first subset of the set of pilot resource elements, and transmitting the set of pilot resource elements is based at least in part on this refraining. In some examples, the measure may include a percentile peak, and selecting the constellation point includes determining, for each constellation point of the set of constellation points, a percentile peak value over a symbol period overlapping in time with the first pilot resource element, and selecting a first constellation point of the set of constellation points associated with a higher percentile peak value than a percentile peak value of a second constellation point of the set of constellation points. In some examples, the first constellation point may be associated with the highest percentile peak of each constellation point in the set of constellation points.

[0090] In some examples, generating the sequence may include identifying a set of constellation points for each pilot resource element of the set of pilot resource elements; generating a plurality of sequences of constellation points, each sequence of constellation points including one constellation point from a respective set of constellation points for the set of pilot resource elements; determining a measure value for each sequence of constellation points of the plurality of sequences of constellation points; and selecting a sequence of constellation points from the plurality of sequences of constellation points based on determining the measure value for each constellation point of the set of constellation points for the set of pilot resource elements, wherein transmitting the set of pilot resource elements is based on selecting the sequence of constellation points.

[0091] In some examples, the first device 205-b may identify a number of constellation points associated with performing quadrature amplitude modulation (QAM) on pilot resource elements of the set of pilot resource elements, and generating the sequence is based at least in part on the number of constellation points being above a threshold. For example, below 1024QAM, the first device 205-b may not generate the sequence based on determining a 1st percentile peak value for each pilot symbol of the set of pilot symbols. However, above 1024QAM, the first device 205-b may generate the sequence based on determining a 1st percentile peak value for each pilot symbol of the set of pilot symbols.

[0092] At 415, the first device 205-b may transmit a set of pilot resource elements associated with the set of data resource elements to the second device 210-b in one or more symbols. At 420, the first device 205-b may transmit the set of data resource elements to the second device 210-b in one or more symbols. In some examples, transmitting the set of pilot resource elements may be based on selecting a sequence from a set of sequence candidates. In some examples, transmitting the set of pilot resource elements may be based on selecting a constellation point and / or selecting a second constellation point.

[0093] In some examples, the first device 205-b may transmit to the second device 210-b an indication of a first subset of the set of pilot resource elements, where the first subset of the set of resource elements does not include at least one pilot resource element of the set of pilot resource elements. In some examples, transmitting the set of pilot resource elements may be based on transmitting the indication of the first subset of the set of pilot resource elements. In some examples, transmitting the indication of the first subset of the set of pilot resource elements includes transmitting configuration signaling that identifies the first subset of the set of pilot resource elements. In some examples, transmitting the configuration signaling that identifies the first subset of the set of pilot resource elements includes transmitting a DMRS that identifies the first subset of the set of pilot resource elements. In some examples, the first device 205-b may identify a first subset of the set of pilot resource elements that does not include a second subset of the set of pilot resource elements, where transmitting the set of pilot resource elements is based on identifying the first subset of the set of pilot resource elements. In some examples, the first device 205-b may modulate each pilot resource element using QPSK and transmit the set of pilot resource elements based on this modulating.

[0094] At 425, the second device 210-b may decode a second subset of the set of pilot resource elements based on the first subset of the set of pilot resource elements to determine a DMRS associated with the set of data resource elements. In some examples, the second device 210-b may identify a first subset of the set of pilot resource elements that does not include the second subset of the set of pilot resource elements, and decoding the second subset of the set of pilot resource elements is based on identifying the first subset of the set of pilot resource elements. In some examples, receiving the set of pilot resource elements is based on a sequence having a lowest or highest value of a measure for the set of values.

[0095] At 430, the second device 210-b may perform a DPoD procedure on the received set of data resource elements based on the determined DMRS.

[0096] 5 illustrates a block diagram 500 of a device 505 supporting an improved demodulation reference signal for digital post-distortion assistance according to an embodiment of the disclosure. The device 505 may be an example of an embodiment of a UE 115, a base station 105, or a first device 205 as described herein. The device 505 may include a receiver 510, a transmitter 515, and a communications manager 520. The device 505 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

[0097] The receiver 510 may provide a means for receiving information such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., a control channel, a data channel, an information channel related to an improved demodulation reference signal for digital post-distortion assistance). The information may be passed on to other components of the device 505. The receiver 510 may utilize a single antenna or a set of multiple antennas.

[0098] The transmitter 515 may provide a means for transmitting signals generated by other components of the device 505. For example, the transmitter 515 may transmit information such as packets associated with various information channels (e.g., a control channel, a data channel, an information channel related to an improved demodulation reference signal for digital post-distortion assistance), user data, control information, or any combination thereof. In some examples, the transmitter 515 may be collocated with the receiver 510 in a transceiver module. The transmitter 515 may utilize a single antenna or a set of multiple antennas.

[0099] The communications manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be examples of means for performing various aspects of the improved demodulation reference signal for digital post-distortion assistance as described herein. For example, the communications manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may support a method for performing one or more of the functions described herein.

[0100] In some examples, the communications manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be implemented in hardware (e.g., in a communications management circuit). The hardware may include a processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting means for performing the functions described in this disclosure. In some examples, the processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing, by the processor, instructions stored in the memory).

[0101] Additionally or alternatively, in some examples, the communications manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communications management software or firmware). If implemented in code executed by a processor, the functions of the communications manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be performed by a general purpose processor, a DSP, a central processing unit (CPU), an ASIC, an FPGA, or any combination of these or other programmable logic devices (e.g., configured as a means for performing or otherwise supporting the functions described in this disclosure).

[0102] In some examples, the communications manager 520 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the receiver 510, the transmitter 515, or both. For example, the communications manager 520 may receive information from the receiver 510, transmit information to the transmitter 515, or be integrated in combination with the receiver 510, the transmitter 515, or both to receive information, transmit information, or perform various other operations described herein.

[0103] Communications manager 520 may support wireless communications in a first wireless device according to examples disclosed herein. For example, communications manager 520 may be configured as or otherwise support a means for identifying a set of data resource elements for transmitting data in one or more symbol periods. Communications manager 520 may be configured as or otherwise support a means for generating, for one or more symbol periods based at least in part on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, the sequence of the set of pilot resource elements including a demodulation reference signal. Communications manager 520 may be configured as or otherwise support a means for transmitting, to a second wireless device in one or more symbol periods, a set of data resource elements and a set of pilot resource elements associated with the set of data resource elements.

[0104] By including or configuring the communications manager 520 according to examples described herein, the device 505 (e.g., a processor controlling, or possibly coupled to, the receiver 510, the transmitter 515, the communications manager 520, or a combination thereof) may support techniques for the device 505 to compensate for transmission nonlinearities caused by the PA of the device receiving the set of data resource elements and the set of pilot resource elements. Additionally or alternatively, the techniques described herein may lower the probability that a PA mismatch may occur, may allow the device 505 to use a smaller PA backoff, may increase the range of communications, or any combination thereof.

[0105] 6 illustrates a block diagram 600 of a device 605 supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. The device 605 may be an example of an aspect of the device 505, the UE 115, the base station 105, or the first device 205 as described herein. The device 605 may include a receiver 610, a transmitter 615, and a communications manager 620. The device 605 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

[0106] The receiver 610 may provide a means for receiving information such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., a control channel, a data channel, an information channel related to an improved demodulation reference signal for digital post-distortion assistance). The information may be passed to other components of the device 605. The receiver 610 may utilize a single antenna or a set of multiple antennas.

[0107] The transmitter 615 may provide a means for transmitting signals generated by other components of the device 605. For example, the transmitter 615 may transmit information such as packets associated with various information channels (e.g., a control channel, a data channel, an information channel related to an improved demodulation reference signal for digital post-distortion assistance), user data, control information, or any combination thereof. In some examples, the transmitter 615 may be collocated with the receiver 610 in a transceiver module. The transmitter 615 may utilize a single antenna or a set of multiple antennas.

[0108] The device 605, or various components thereof, may be examples of means for performing various aspects of the improved demodulation reference signal for digital post-distortion assistance as described herein. For example, the communications manager 620 may include a data discriminator 625, a sequence generator 630, a resource element transmitter 635, or any combination thereof. The communications manager 620 may be an example of an aspect of the communications manager 520 as described herein. In some examples, the communications manager 620 or various components thereof may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the receiver 610, the transmitter 615, or both. For example, the communications manager 620 may receive information from the receiver 610, transmit information to the transmitter 615, or may be integrated in combination with the receiver 610, the transmitter 615, or both to receive information, transmit information, or perform various other operations as described herein.

[0109] The communications manager 620 may support wireless communications in the first wireless device according to examples disclosed herein. The data identifier 625 may be configured as or otherwise support a means for identifying a set of data resource elements for transmitting data in one or more symbol periods. The sequence generator 630 may be configured as or otherwise support a means for generating a sequence of a set of pilot resource elements associated with the set of data resource elements for one or more symbol periods based on the set of data resource elements, the sequence of the set of pilot resource elements including a demodulation reference signal. The resource element transmitter 635 may be configured as or otherwise support a means for transmitting the set of data resource elements and the set of pilot resource elements associated with the set of data resource elements to the second wireless device in one or more symbol periods.

[0110] FIG. 7 illustrates a block diagram 700 of a communications manager 720 supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. The communications manager 720 may be an example of an aspect of the communications manager 520, the communications manager 620, or both, as described herein. The communications manager 720, or various components thereof, may be an example of a means for implementing various aspects of the improved demodulation reference signal for digital post-distortion assistance as described herein. For example, the communications manager 720 may include a data identifier 725, a sequence generator 730, a resource element transmitter 735, a resource element indication transmitter 740, a pilot resource element identifier 745, a modulation component 750, a constellation point identifier 755, a scale value determiner 760, a constellation point selection component 765, a configuration signaling transmitter 770, or any combination thereof. Each of these components may be in direct or indirect communication with one another (e.g., via one or more buses).

[0111] The communications manager 720 may support wireless communications in the first wireless device according to examples disclosed herein. The data identifier 725 may be configured as or otherwise support a means for identifying a set of data resource elements for transmitting data in one or more symbol periods. The sequence generator 730 may be configured as or otherwise support a means for generating a sequence of a set of pilot resource elements associated with the set of data resource elements for one or more symbol periods based on the set of data resource elements, the sequence of the set of pilot resource elements including a demodulation reference signal. The resource element transmitter 735 may be configured as or otherwise support a means for transmitting the set of data resource elements and the set of pilot resource elements associated with the set of data resource elements to the second wireless device in one or more symbol periods.

[0112] In some examples, the resource element indication transmitter 740 may be configured or otherwise support as a means for transmitting, to the second wireless device, an indication of a first subset of the set of pilot resource elements, where the first subset of the set of pilot resource elements does not include at least one pilot resource element of the set of pilot resource elements, and where transmitting the set of pilot resource elements is based on transmitting an indication of the first subset of the set of pilot resource elements.

[0113] In some examples, to support transmitting an indication of a first subset of the set of pilot resource elements, the configuration signaling transmitter 770 may be configured as or otherwise support configuration signaling identifying the first subset of the set of pilot resource elements.

[0114] In some examples, to support transmitting configuration signaling that identifies a first subset of the set of pilot resource elements, the configuration signaling transmitter 770 may be configured as or otherwise support a means for transmitting a demodulation reference signal configuration that identifies the first subset of the set of pilot resource elements.

[0115] In some examples, the pilot resource element identifier 745 may be configured as or otherwise support a means for identifying a first subset of the set of pilot resource elements that does not include a second subset of the set of pilot resource elements, and transmitting the set of pilot resource elements is based on identifying the first subset of the set of pilot resource elements.

[0116] In some examples, to support determining the sequence, the sequence generator 730 may be configured as or otherwise support a means for selecting a sequence from a set of sequences, and transmitting the set of pilot resource elements is based on selecting a sequence from the set of sequences.

[0117] In some examples, a sequence is selected from the set of sequences based on a measure of the sequence satisfying a threshold.

[0118] In some examples, the metric includes a percentile peak value. In some examples, meeting the threshold includes the percentile peak value being above the threshold.

[0119] In some examples, each sequence in the set of sequence candidates has an associated value of the measure, and a sequence is selected from the set of sequences based at least in part on the sequence's associated value of the measure having a lowest value or a highest value compared to the values ​​of the measure of each of the other sequences in the set of sequence candidates.

[0120] In some examples, modulation component 750 may be configured as or otherwise support a means for modulating each pilot resource element of a set of pilot resource elements using quadrature phase shift keying, and transmitting the set of pilot resource elements is based on this modulating.

[0121] In some examples, the constellation point identifier 755 may be configured or otherwise support a means for identifying a set of constellation points associated with a pilot resource element of the set of pilot resource elements. In some examples, the measure value determiner 760 may be configured or otherwise support a means for determining a value of the measure for a pilot resource element for each constellation point of the set of constellation points. In some examples, the constellation point selection component 765 may be configured or otherwise support a means for selecting a constellation point of the set of constellation points based on determining a value of the measure for each constellation point of the set of constellation points for a pilot resource element, and transmitting the set of pilot resource elements is based on selecting the constellation point.

[0122] In some examples, the constellation point identifier 755 may be configured as or otherwise support a means for identifying a second set of constellation points associated with a second pilot resource element of the set of pilot resource elements. In some examples, the measure value determiner 760 may be configured as or otherwise support a means for determining a second value of the measure for a second pilot resource element for each constellation point of the second set of constellation points. In some examples, the constellation point selection component 765 may be configured as or otherwise support a means for selecting a second constellation point of the second set of constellation points based on determining a second value of the measure for each constellation point of the second set of constellation points for the second pilot resource element, and transmitting the set of pilot resource elements is based on selecting the second constellation point.

[0123] In some examples, the pilot resource element identifier 745 may be configured as or otherwise support a means for identifying a first subset of the set of pilot resource elements that does not include a second subset of the set of pilot resource elements, the second subset of the set of pilot resource elements including the first pilot resource element and the second pilot resource element. In some examples, the sequence generator 730 may be configured as or otherwise support a means for selecting, for each pilot resource element of the second subset of the set of pilot resource elements, a respective constellation point of the respective set of constellation points based on determining a respective value of the measure for each constellation point of the respective set of constellation points, and transmitting the set of pilot resource elements is based at least in part on selecting a respective constellation point for each pilot resource element of the second subset of the set of pilot resource elements. In some examples, the sequence generator 730 may be configured as or otherwise support a means for refraining from determining a respective value of the measure for each pilot resource element of a first subset of the set of pilot resource elements, and transmitting the set of pilot resource elements is based at least in part on this refraining.

[0124] In some examples, the measure may include a percentile peak, and selecting the constellation point may include determining, for each constellation point of the set of constellation points, a percentile peak value over a symbol period overlapping in time with the first pilot resource element, and selecting a first constellation point of the set of constellation points associated with a higher percentile peak value than a percentile peak value of a second constellation point of the set of constellation points. In some examples, the first constellation point may be associated with the highest percentile peak of each constellation point in the set of constellation points.

[0125] In some examples, the constellation point identifier 755 may be configured or otherwise supported as a means for identifying a set of constellation points for each pilot resource element of the set of pilot resource elements. In some examples, the sequence generator 730 may be configured or otherwise supported as a means for generating a plurality of sequences of constellation points, each sequence of constellation points including one constellation point from each set of constellation points for the set of pilot resource elements. In some examples, the measure value determiner 760 may be configured or otherwise supported as a means for determining a measure value for each sequence of constellation points of the plurality of sequences of constellation points. In some examples, the constellation point selection component 765 may be configured or otherwise supported as a means for selecting a constellation point of the set of constellation points based on determining a measure value for each constellation point of the set of constellation points for the set of pilot resource elements, and transmitting the set of pilot resource elements is based on selecting the sequence of constellation points.

[0126] In some examples, the sequence generator 730 may be configured as or otherwise support a means for identifying a number of constellation points associated with performing quadrature amplitude modulation on data resource elements of the set of data resource elements, where generating the sequence is based at least in part on the number of constellation points exceeding a threshold.

[0127] In some examples, the resource element transmitter 735 may be configured as or otherwise support a means for transmitting a second set of pilot resource elements associated with the set of data resource elements to a second wireless device in one or more symbol periods, the set of pilot resource elements being associated with a first set of metric values ​​whose average is higher than a second set of metric values ​​associated with the second set of pilot resource elements.

[0128] In some examples, the measure includes a percentile peak value.

[0129] FIG. 8 illustrates a diagram of a system 800 including a device 805 supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. The device 805 may be or include an example of a device 505, a device 605, a UE 115, a base station 105, or a first device 205 as described herein. The device 805 may wirelessly communicate with one or more base stations 105, UEs 115, or any combination thereof. The device 805 may include components for two-way voice and data communication, including components for transmitting and receiving communications, such as a communications manager 820, an input / output (I / O) controller 810, a transceiver 815, an antenna 825, a memory 830, code 835, and a processor 840. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., bus 845).

[0130] The I / O controller 810 may manage input and output signals for the device 805. The I / O controller 810 may also manage peripheral devices that are not integrated into the device 805. In some cases, the I / O controller 810 may represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 810 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®, or another known operating system. Additionally or alternatively, the I / O controller 810 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, the I / O controller 810 may be implemented as part of a processor, such as the processor 840. In some cases, a user may interact with the device 805 through the I / O controller 810 or through hardware components controlled by the I / O controller 810.

[0131] In some cases, the device 805 may include a single antenna 825. However, in some other cases, the device 805 may have two or more antennas 825 that may be capable of simultaneously transmitting or receiving multiple wireless transmissions. The transceiver 815 may communicate bidirectionally via one or more antennas 825, a wired link, or a wireless link, as described herein. For example, the transceiver 815 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 815 may also include a modem for modulating packets and providing the modulated packets to the one or more antennas 825 for transmission, and for demodulating packets received from the one or more antennas 825. The transceiver 815, or the transceiver 815 and the one or more antennas 825, may be examples of the transmitter 515, the transmitter 615, the receiver 510, the receiver 610, or any combination thereof or components thereof, as described herein.

[0132] The memory 830 may include random access memory (RAM) and read only memory (ROM). The memory 830 may store computer readable, computer executable code 835 including instructions that, when executed by the processor 840, cause the device 805 to perform various functions described herein. The code 835 may be stored in a non-transitory computer readable medium, such as a system memory or another type of memory. In some cases, the code 835 may not be directly executable by the processor 840, but may (e.g., when compiled and executed) cause the computer to perform functions described herein. In some cases, the memory 830 may include a basic I / O system (BIOS) that may control basic hardware or software operations, such as interaction with peripheral components or devices, among others.

[0133] The processor 840 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 840 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into the processor 840. The processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks supporting an improved demodulation reference signal for digital post-distortion assistance). For example, the device 805 or a component of the device 805 may include a processor 840 and a memory 830 coupled to the processor 840, where the processor 840 and the memory 830 are configured to perform various functions described herein.

[0134] The communications manager 820 may support wireless communications in a first wireless device according to examples disclosed herein. For example, the communications manager 820 may be configured as or otherwise support a means for identifying a set of data resource elements for transmitting data in one or more symbol periods. The communications manager 820 may be configured as or otherwise support a means for generating, for one or more symbol periods based at least in part on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, the sequence of the set of pilot resource elements including a demodulation reference signal. The communications manager 820 may be configured as or otherwise support a means for transmitting, to a second wireless device in one or more symbol periods, a set of data resource elements and a set of pilot resource elements associated with the set of data resource elements.

[0135] By including or configuring a communications manager 820 according to examples described herein, the device 805 may support techniques for the device 805 to compensate for transmission nonlinearities caused by the PA of a device receiving a set of data resource elements and a set of pilot resource elements. Additionally or alternatively, the techniques described herein may lower the probability that a PA mismatch may occur, may allow the device 805 to use a smaller PA backoff, may increase the range of communications, or any combination thereof.

[0136] In some examples, the communications manager 820 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the transceiver 815, the one or more antennas 825, or any combination thereof. Although the communications manager 820 is shown as a separate component, in some examples, one or more functions described in connection with the communications manager 820 may be supported or performed by the processor 840, the memory 830, the code 835, or any combination thereof. For example, the code 835 may include instructions executable by the processor 840 to cause the device 805 to perform various aspects of an improved demodulation reference signal for digital post-distortion assistance as described herein, or the processor 840 and the memory 830 may be otherwise configured to perform or support such operations.

[0137] 9 illustrates a block diagram 900 of a device 905 supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. The device 905 may be an example of an aspect of a base station 105, a UE 115, or a second device 210 as described herein. The device 905 may include a receiver 910, a transmitter 915, and a communications manager 920. The device 905 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

[0138] The receiver 910 may provide a means for receiving information such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., a control channel, a data channel, an information channel related to an improved demodulation reference signal for digital post-distortion assistance). The information may be passed to other components of the device 905. The receiver 910 may utilize a single antenna or a set of multiple antennas.

[0139] The transmitter 915 may provide a means for transmitting signals generated by other components of the device 905. For example, the transmitter 915 may transmit information such as packets associated with various information channels (e.g., a control channel, a data channel, an information channel related to an improved demodulation reference signal for digital post-distortion assistance), user data, control information, or any combination thereof. In some examples, the transmitter 915 may be collocated with the receiver 910 in a transceiver module. The transmitter 915 may utilize a single antenna or a set of multiple antennas.

[0140] The communications manager 920, the receiver 910, the transmitter 915, or various combinations or components thereof may be examples of means for performing various aspects of the improved demodulation reference signal for digital post-distortion assistance as described herein. For example, the communications manager 920, the receiver 910, the transmitter 915, or various combinations or components thereof may support a method for performing one or more of the functions described herein.

[0141] In some examples, the communications manager 920, the receiver 910, the transmitter 915, or various combinations or components thereof may be implemented in hardware (e.g., in a communications management circuit). The hardware may include a processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in this disclosure. In some examples, the processor, and a memory coupled to the processor, may be configured to perform one or more of the functions described herein (e.g., by executing, by the processor, instructions stored in the memory).

[0142] Additionally or alternatively, in some examples, the communications manager 920, the receiver 910, the transmitter 915, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communications management software or firmware). If implemented in code executed by a processor, the functions of the communications manager 920, the receiver 910, the transmitter 915, or various combinations or components thereof may be performed by a general purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination of these or other programmable logic devices (e.g., configured as a means for performing or otherwise supporting the functions described in this disclosure).

[0143] In some examples, the communications manager 920 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the receiver 910, the transmitter 915, or both. For example, the communications manager 920 may receive information from the receiver 910, transmit information to the transmitter 915, or be integrated in combination with the receiver 910, the transmitter 915, or both to receive information, transmit information, or perform various other operations described herein.

[0144] The communications manager 920 may support wireless communications at a second wireless device according to examples disclosed herein. For example, the communications manager 920 may be configured as or otherwise support a means for receiving a set of data resource elements and a set of pilot resource elements including a demodulation reference signal associated with the set of data resource elements from the first wireless device in one or more symbol periods. The communications manager 920 may be configured as or otherwise support a means for decoding a first subset of the set of pilot resource elements based on a second subset of the set of pilot resource elements to determine a demodulation reference signal associated with the set of data resource elements. The communications manager 920 may be configured as or otherwise support a means for performing a digital post-distortion procedure on the received set of data resource elements based on the determined demodulation reference signal.

[0145] By including or configuring the communications manager 920 according to examples described herein, the device 905 (e.g., a processor controlling, or possibly coupled to, the receiver 910, the transmitter 915, the communications manager 920, or a combination thereof) may support techniques for the device 905 to increase the range of communication with a wireless device from which the set of pilot resource elements and / or the set of data resource elements are received. Additionally, decoding the first subset based on the second subset to determine the DMRS may enable the set of pilot resource elements to have a nonlinearity that approximates the nonlinearity of the set of data resource elements or the set of PTRS resource elements, which may increase the efficiency of DPoD.

[0146] 10 illustrates a block diagram 1000 of a device 1005 supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. The device 1005 may be an example of an aspect of a device 905 or a base station 105 as described herein. The device 1005 may include a receiver 1010, a transmitter 1015, and a communications manager 1020. The device 1005 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

[0147] The receiver 1010 may provide a means for receiving information such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., a control channel, a data channel, an information channel related to an improved demodulation reference signal for digital post-distortion assistance). The information may be passed to other components of the device 1005. The receiver 1010 may utilize a single antenna or a set of multiple antennas.

[0148] The transmitter 1015 may provide a means for transmitting signals generated by other components of the device 1005. For example, the transmitter 1015 may transmit information such as packets associated with various information channels (e.g., a control channel, a data channel, an information channel related to an improved demodulation reference signal for digital post-distortion assistance), user data, control information, or any combination thereof. In some examples, the transmitter 1015 may be collocated with the receiver 1010 in a transceiver module. The transmitter 1015 may utilize a single antenna or a set of multiple antennas.

[0149] The device 1005, or various components thereof, may be examples of means for performing various aspects of the improved demodulation reference signal for digital post-distortion assistance described herein. For example, the communications manager 1020 may include a resource element receiver 1025, a decoding component 1030, a DPoD component 1035, or any combination thereof. The communications manager 1020 may be an example of an aspect of the communications manager 920 as described herein. In some examples, the communications manager 1020 or various components thereof may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the receiver 1010, the transmitter 1015, or both. For example, the communications manager 1020 may be integrated in combination with the receiver 1010, the transmitter 1015, or both to receive information from the receiver 1010, transmit information to the transmitter 1015, or to receive information, transmit information, or perform various other operations as described herein.

[0150] The communications manager 1020 may support wireless communications at the second wireless device according to examples disclosed herein. The resource element receiver 1025 may be configured as or otherwise support a means for receiving a set of data resource elements and a set of pilot resource elements including a demodulation reference signal associated with the set of data resource elements from the first wireless device in one or more symbol periods. The decoding component 1030 may be configured as or otherwise support a means for decoding a first subset of the set of pilot resource elements based on a second subset of the set of pilot resource elements to determine a demodulation reference signal associated with the set of data resource elements. The DPoD component 1035 may be configured as or otherwise support a means for performing a digital post-distortion procedure on the received set of data resource elements based on the determined demodulation reference signal.

[0151] FIG. 11 illustrates a block diagram 1100 of a communications manager 1120 supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. The communications manager 1120 may be an example of an aspect of the communications manager 920, the communications manager 1020, or both described herein. The communications manager 1120 or various components thereof may be examples of a means for performing various aspects of the improved demodulation reference signal for digital post-distortion assistance as described herein. For example, the communications manager 1120 may include a resource element receiver 1125, a decoding component 1130, a DPoD component 1135, a resource element indication receiver 1140, a resource element identification component 1145, or any combination thereof. Each of these components may be in direct or indirect communication with one another (e.g., via one or more buses).

[0152] The communications manager 1120 may support wireless communications at the second wireless device according to examples disclosed herein. The resource element receiver 1125 may be configured as or otherwise support a means for receiving a set of data resource elements and a set of pilot resource elements including a demodulation reference signal associated with the set of data resource elements from the first wireless device in one or more symbol periods. The decoding component 1130 may be configured as or otherwise support a means for decoding a first subset of the set of pilot resource elements based on a second subset of the set of pilot resource elements to determine a demodulation reference signal associated with the set of data resource elements. The DPoD component 1135 may be configured as or otherwise support a means for performing a digital post-distortion procedure on the received set of data resource elements based on the determined demodulation reference signal.

[0153] In some examples, each pilot resource element of the set of pilot resource elements is modulated according to quadrature phase shift keying.

[0154] In some examples, the resource element indication receiver 1140 may be configured as or otherwise support a means for receiving an indication of a configuration of the set of pilot resource elements from the first wireless device, where receiving the set of pilot resource elements is based on the indicated configuration of the set of pilot resource elements.

[0155] In some examples, the resource element identification component 1145 may be configured as or otherwise support a means for identifying a first subset of the set of pilot resource elements that does not include a second subset of the set of pilot resource elements, and decoding the second subset of the set of pilot resource elements is based on identifying the first subset of the set of pilot resource elements.

[0156] In some examples, receiving the set of pilot resource elements is based on the set of pilot resource elements being associated with a metric that satisfies a threshold.

[0157] In some examples, the metric includes a percentile peak value. In some examples, the metric meeting a threshold value includes the percentile peak value being above a threshold value.

[0158] FIG. 12 illustrates a diagram of a system 1200 including a device 1205 supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. The device 1205 may be an example of or include components of a device 905, a device 1005, a base station 105, a UE 115, or a second device 210 as described herein. The device 1205 may wirelessly communicate with one or more base stations 105, UEs 115, or any combination thereof. The device 1205 may include components for two-way voice and data communication, including components for transmitting and receiving communications, such as a communications manager 1220, a network communications manager 1210, a transceiver 1215, an antenna 1225, a memory 1230, code 1235, a processor 1240, and an inter-station communications manager 1245. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., bus 1250).

[0159] The network communications manager 1210 may manage communications with the core network 130 (e.g., via one or more wired backhaul links). For example, the network communications manager 1210 may manage the forwarding of data communications for client devices, such as one or more UEs 115.

[0160] In some cases, the device 1205 may include a single antenna 1225. However, in some other cases, the device 1205 may have two or more antennas 1225 that may be capable of simultaneously transmitting or receiving multiple wireless transmissions. The transceiver 1215 may communicate bidirectionally via one or more antennas 1225, a wired link, or a wireless link, as described herein. For example, the transceiver 1215 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1215 may also include a modem for modulating packets, providing the modulated packets to one or more antennas 1225 for transmission, and demodulating packets received from the one or more antennas 1225. The transceiver 1215, or the transceiver 1215 and one or more antennas 1225, may be an example of a transmitter 915, a transmitter 1015, a receiver 910, a receiver 1010, or any combination or components thereof, as described herein.

[0161] The memory 1230 may include RAM and ROM. The memory 1230 may store computer-readable, computer-executable code 1235 including instructions that, when executed by the processor 1240, cause the device 1205 to perform various functions described herein. The code 1235 may be stored in a non-transitory computer-readable medium, such as a system memory or another type of memory. In some cases, the code 1235 may not be directly executable by the processor 1240, but may (e.g., when compiled and executed) cause the computer to perform functions described herein. In some cases, the memory 1230 may include a BIOS, which may control basic hardware or software operations, such as interactions with peripheral components or devices, among other things.

[0162] The processor 1240 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 1240 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into the processor 1240. The processor 1240 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1230) to cause the device 1205 to perform various functions (e.g., functions or tasks supporting an improved demodulation reference signal for digital post-distortion assistance). For example, the device 1205 or a component of the device 1205 may include a processor 1240 and a memory 1230 coupled to the processor 1240, where the processor 1240 and the memory 1230 are configured to perform various functions described herein.

[0163] The inter-station communications manager 1245 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with the UE 115 in cooperation with the other base stations 105. For example, the inter-station communications manager 1245 may coordinate scheduling for transmissions to the UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the inter-station communications manager 1245 may provide an X2 interface in LTE / LTE-A wireless communications network technology to communicate between the base stations 105.

[0164] The communications manager 1220 may support wireless communications at a second wireless device according to examples disclosed herein. For example, the communications manager 1220 may be configured as or otherwise support a means for receiving from a first wireless device in one or more symbol periods a set of data resource elements and a set of pilot resource elements including a demodulation reference signal associated with the set of data resource elements. The communications manager 1220 may be configured as or otherwise support a means for decoding a first subset of the set of pilot resource elements based on a second subset of the set of pilot resource elements to determine a demodulation reference signal associated with the set of data resource elements. The communications manager 1220 may be configured as or otherwise support a means for performing a digital post-distortion procedure on the received set of data resource elements based on the determined demodulation reference signal.

[0165] By including or configuring a communications manager 1220 according to examples described herein, the device 1205 may support techniques for the device 1205 to increase the range of communication with a wireless device from which the set of pilot resource elements and / or the set of data resource elements are received. Additionally, decoding the first subset based on the second subset to determine the DMRS may allow the set of pilot resource elements to have a nonlinearity close to the nonlinearity of the set of data resource elements or the set of PTRS resource elements, which may increase the efficiency of DPoD.

[0166] In some examples, the communications manager 1220 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the transceiver 1215, one or more antennas 1225, or any combination thereof. Although the communications manager 1220 is shown as a separate component, in some examples, one or more functions described in connection with the communications manager 1220 may be supported or performed by the processor 1240, the memory 1230, the code 1235, or any combination thereof. For example, the code 1235 may include instructions executable by the processor 1240 to cause the device 1205 to perform various aspects of an improved demodulation reference signal for digital post-distortion assistance as described herein, or the processor 1240 and the memory 1230 may be otherwise configured to perform or support such operations.

[0167] FIG. 13 illustrates a flow chart illustrating a method 1300 for supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. The operations of the method 1300 may be performed by a UE or components thereof as described herein. For example, the operations of the method 1300 may be performed by a UE 115 as described with reference to FIGS. 1-8. In some examples, the UE may execute a set of instructions to control functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may perform aspects of the described functions using dedicated hardware.

[0168] At 1305, the method may include identifying a set of data resource elements for transmitting data in one or more symbol periods. The operations of 1305 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1305 may be performed by a data discriminator 725 as described with reference to FIG.

[0169] At 1310, the method may include generating, for one or more symbol periods based on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, where the sequence of the set of pilot resource elements includes a demodulation reference signal. The operations of 1310 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1310 may be performed by a sequence generator 730 as described with reference to FIG.

[0170] At 1315, the method may include transmitting the set of data resource elements and the set of pilot resource elements associated with the set of data resource elements to the second wireless device in one or more symbol periods. The operations of 1315 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1315 may be performed by a resource element transmitter 735 as described with reference to FIG.

[0171] FIG. 14 illustrates a flow chart illustrating a method 1400 for supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. The operations of the method 1400 may be performed by a UE or components thereof as described herein. For example, the operations of the method 1400 may be performed by the UE 115 as described with reference to FIGS. 1-8. In some examples, the UE may execute a set of instructions to control functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may perform aspects of the described functions using dedicated hardware.

[0172] At 1405, the method may include transmitting an indication of a first subset of the set of pilot resource elements to the second wireless device, the first subset of the set of pilot resource elements not including at least one pilot resource element of the set of pilot resource elements. The operations of 1405 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1405 may be performed by a resource element indication transmitter 740 as described with reference to FIG.

[0173] At 1410, the method may include identifying a set of data resource elements for transmitting data in one or more symbol periods. The operations of 1410 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1410 may be performed by a data discriminator 725 as described with reference to FIG.

[0174] At 1415, the method may include generating, for one or more symbol periods based at least in part on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, where the sequence of the set of pilot resource elements includes a demodulation reference signal. The operations of 1415 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1415 may be performed by a sequence generator 730 as described with reference to FIG. 7.

[0175] At 1420, the method may include transmitting, to the second wireless device in one or more symbol periods, the set of data resource elements and a set of pilot resource elements associated with the set of data resource elements, where transmitting the set of pilot resource elements is based at least in part on transmitting an indication of a first subset of the set of pilot resource elements. The operations of 1420 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1420 may be performed by a resource element transmitter 735 as described with reference to FIG.

[0176] FIG. 15 illustrates a flow chart illustrating a method 1500 for supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the disclosure. The operations of the method 1500 may be performed by a base station or components thereof as described herein. For example, the operations of the method 1500 may be performed by a base station 105 as described with reference to FIGS. 1-4 and 9-12. In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the described functions. Additionally or alternatively, the base station may perform aspects of the described functions using dedicated hardware.

[0177] At 1505, the method may include receiving from the first wireless device in one or more symbol periods a set of data resource elements and a set of pilot resource elements including demodulation reference signals associated with the set of data resource elements. The operations of 1505 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1505 may be performed by a resource element receiver 1125 as described with reference to FIG.

[0178] At 1510, the method may include decoding a second subset of the set of pilot resource elements based on the first subset of the set of pilot resource elements to determine a demodulation reference signal associated with the set of data resource elements. The operations of 1510 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1510 may be performed by a decoding component 1130 as described with reference to FIG.

[0179] At 1515, the method may include performing a digital post-distortion procedure on the received set of data resource elements based on the determined demodulation reference signal. The operations of 1515 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1515 may be performed by a DPoD component 1135 as described with reference to FIG.

[0180] FIG. 16 illustrates a flow chart illustrating a method 1600 for supporting an improved demodulation reference signal for digital post-distortion assistance according to an aspect of the present disclosure. The operations of the method 1600 may be performed by a base station or components thereof as described herein. For example, the operations of the method 1600 may be performed by a base station 105 as described with reference to FIGS. 1-4 and 9-12. In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the described functions. Additionally or alternatively, the base station may perform aspects of the described functions using dedicated hardware.

[0181] At 1605, the method may include receiving an indication of a configuration of a set of pilot resource elements from the first wireless device. The operations of 1605 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1605 may be performed by a resource element indication receiver 1140 as described with reference to FIG.

[0182] At 1610, the method may include receiving, from the first wireless device in one or more symbol periods, a set of data resource elements and a set of pilot resource elements including demodulation reference signals associated with the set of data resource elements, where receiving the set of pilot resource elements is based at least in part on an illustrated configuration of the set of pilot resource elements. The operations of 1610 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1610 may be performed by a resource element receiver 1125 as described with reference to FIG. 11.

[0183] At 1615, the method may include decoding a second subset of the set of pilot resource elements based at least in part on the first subset of the set of pilot resource elements to determine a demodulation reference signal associated with the set of data resource elements. The operations of 1615 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1615 may be performed by a decoding component 1130 as described with reference to FIG. 11.

[0184] At 1620, the method may include performing a digital post-distortion procedure on the received set of data resource elements based at least in part on the determined demodulation reference signal. The operations of 1620 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1620 may be performed by the DPoD component 1135 as described with reference to FIG.

[0185] The following provides a summary of aspects of the disclosure.

[0186] Aspect 1: A method for wireless communication at a first wireless device, the method including: identifying a set of data resource elements for transmitting data in one or more symbol periods; generating, for one or more symbol periods based at least in part on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, the sequence of the set of pilot resource elements including a demodulation reference signal; and transmitting the set of data resource elements and the set of pilot resource elements associated with the set of data resource elements to a second wireless device in the one or more symbol periods.

[0187] Aspect 2: The method of aspect 1, further comprising transmitting an indication of a first subset of the set of pilot resource elements to a second wireless device, the first subset of the set of pilot resource elements not including at least one pilot resource element of the set of pilot resource elements, and wherein transmitting the set of pilot resource elements is based at least in part on transmitting the indication of the first subset of the set of pilot resource elements.

[0188] Aspect 3: The method of aspect 2, wherein transmitting the indication of the first subset of the set of pilot resource elements includes transmitting configuration signaling that identifies the first subset of the set of pilot resource elements.

[0189] Aspect 4: The method of aspect 3, wherein the step of transmitting configuration signaling specifying a first subset of the set of pilot resource elements includes the step of transmitting a demodulation reference signal configuration specifying the first subset of the set of pilot resource elements.

[0190] Aspect 5: The method of any of aspects 1 to 4, further comprising identifying a first subset of the set of pilot resource elements that does not include a second subset of the set of pilot resource elements, wherein transmitting the set of pilot resource elements is based at least in part on identifying the first subset of the set of pilot resource elements.

[0191] Aspect 6: The method of any of aspects 1 to 5, wherein the step of generating a sequence includes the step of selecting a sequence from a set of sequences, and the step of transmitting the set of pilot resource elements is based at least in part on selecting a sequence from the set of sequences.

[0192] Embodiment 7: The method of embodiment 6, wherein the sequence is selected from the set of sequences based at least in part on a measure of the sequence satisfying a threshold.

[0193] Embodiment 8: The method of embodiment 7, wherein the measure comprises a percentile peak value and wherein satisfying the threshold comprises the percentile peak value being above the threshold.

[0194] Aspect 9: The method of any of aspects 6 to 8, wherein each sequence in the set of sequence candidates has an associated value of the measure, and the sequence is selected from the set of sequences based at least in part on the sequence's associated value of the measure having a lowest value or a highest value compared to the values ​​of the measure of each of the other sequences in the set of sequence candidates.

[0195] Aspect 10: The method of any of aspects 1 to 9, further comprising modulating each pilot resource element of the set of pilot resource elements using quadrature phase shift keying, wherein transmitting the set of pilot resource elements is based at least in part on the modulating step.

[0196] Aspect 11: The method of any of aspects 1-10, further comprising: identifying a set of constellation points associated with pilot resource elements of the set of pilot resource elements; determining a value of the measure for the pilot resource element for each constellation point of the set of constellation points; and selecting a constellation point from the set of constellation points for the pilot resource element based at least in part on determining the value of the measure for each constellation point of the set of constellation points, wherein transmitting the set of pilot resource elements is based at least in part on selecting the constellation point.

[0197] Aspect 12: The method of aspect 11, further comprising: identifying a second set of constellation points associated with a second pilot resource element of the set of pilot resource elements; determining a second value of the measure for the second pilot resource element for each constellation point of the second set of constellation points; and selecting, for the second pilot resource element, a second constellation point of the second set of constellation points based at least in part on determining the second value of the measure for each constellation point of the second set of constellation points, wherein transmitting the set of pilot resource elements is based at least in part on selecting the second constellation point.

[0198] Aspect 13: The method of aspect 12, further comprising identifying a first subset of the set of pilot resource elements that does not include a second subset of the set of pilot resource elements, the second subset of the set of pilot resource elements including the first pilot resource element and the second pilot resource element.

[0199] Aspect 14: The method of aspect 13, further comprising: for each pilot resource element of a second subset of the set of pilot resource elements, selecting a respective constellation point of the respective set of constellation points based at least in part on determining a respective value of the measure for each constellation point of the respective set of constellation points, wherein transmitting the set of pilot resource elements is based at least in part on selecting a respective constellation point for each pilot resource element of the second subset of the set of pilot resource elements.

[0200] Aspect 15: The method of aspect 14, further comprising: refraining from determining respective values ​​of the measure for each pilot resource element of a first subset of the set of pilot resource elements, wherein transmitting the set of pilot resource elements is based at least in part on the refraining.

[0201] Aspect 16: The method of any of aspects 11 to 15, wherein the measure includes a percentile peak, and wherein selecting the constellation point includes: for each constellation point of the set of constellation points, determining a percentile peak value over a symbol period that overlaps in time with the first pilot resource element; and selecting a first constellation point of the set of constellation points associated with a higher percentile peak value than a percentile peak value of a second constellation point of the set of constellation points.

[0202] Aspect 17: The method of aspect 16, wherein the first constellation point is associated with a highest percentile peak of each constellation point in the set of constellation points.

[0203] Aspect 18: The method of any of aspects 1 to 17, further comprising determining a number of constellation points associated with performing quadrature amplitude modulation on data resource elements of the set of data resource elements, wherein generating the sequence is based at least in part on the number of constellation points exceeding a threshold.

[0204] Aspect 19: The method of any of aspects 1-18, wherein the generating step includes the steps of identifying a set of constellation points for each pilot resource element of the set of pilot resource elements; generating a plurality of sequences of constellation points, each sequence of constellation points including one constellation point from each set of constellation points for the set of pilot resource elements; determining, for each sequence of constellation points of the plurality of sequences of constellation points, a value of the measure; and selecting, for the set of pilot resource elements, a sequence of constellation points from the plurality of sequences of constellation points based at least in part on determining the value of the measure for each constellation point of the set of constellation points, wherein transmitting the set of pilot resource elements is based at least in part on selecting the sequence of constellation points.

[0205] Embodiment 20: The method of any of embodiments 1 to 19, wherein the measure comprises a percentile peak value.

[0206] Aspect 21: A method for wireless communication at a second wireless device, the method including: receiving from a first wireless device in one or more symbol periods a set of data resource elements and a set of pilot resource elements including a demodulation reference signal associated with the set of data resource elements; decoding a second subset of the set of pilot resource elements based at least in part on the first subset of the set of pilot resource elements to determine a demodulation reference signal associated with the set of data resource elements; and performing a digital post-distortion procedure on the received set of data resource elements based at least in part on the determined demodulation reference signal.

[0207]

[0046] Aspect 22: The method of aspect 21, wherein each pilot resource element of the set of pilot resource elements is modulated according to a quadrature phase shift keying modulation.

[0208] Aspect 23: The method of any of aspects 21 to 22, further comprising receiving an indication of a configuration of the set of pilot resource elements from the first wireless device, wherein receiving the set of pilot resource elements is based at least in part on the indicated configuration of the set of pilot resource elements.

[0209] Aspect 24: The method of any of aspects 21 to 23, further comprising identifying a first subset of the set of pilot resource elements that does not include a second subset of the set of pilot resource elements, wherein decoding the second subset of the set of pilot resource elements is based at least in part on identifying the first subset of the set of pilot resource elements.

[0210] Aspect 25: The method of any of aspects 21-24, wherein receiving the set of pilot resource elements is based at least in part on the set of pilot resource elements being associated with a metric that satisfies a threshold.

[0211] Embodiment 26: The method of embodiment 25, wherein the measure comprises a percentile peak value and wherein the measure satisfying the threshold comprises the percentile peak value being above the threshold.

[0212] Aspect 27: An apparatus for wireless communication in a first wireless device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform any of the methods of aspects 1 to 20.

[0213] Aspect 28: An apparatus for wireless communication in a first wireless device, comprising at least one means for performing the method of any of aspects 1 to 20.

[0214] Aspect 29: A non-transitory computer-readable medium storing code for wireless communication in a first wireless device, the code comprising instructions executable by a processor to perform any of the methods of aspects 1 to 20.

[0215] Aspect 30: An apparatus for wireless communication in a second wireless device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform any of the methods of aspects 21 to 26.

[0216] Aspect 31: An apparatus for wireless communication in a second wireless device, comprising at least one means for performing the method of any of aspects 21 to 26.

[0217] Aspect 32: A non-transitory computer-readable medium storing code for wireless communication in a second wireless device, the code comprising instructions executable by a processor to perform the method of any of aspects 21 to 26.

[0218] It should be noted that the methods described herein describe possible implementations, and that the acts and steps may be rearranged or otherwise modified, and that other implementations are possible. Additionally, aspects from two or more of these methods may be combined.

[0219] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described as examples, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used throughout much of the description, the techniques described herein may be applicable to other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0220] The information and signals described herein may be represented using any of a wide variety of technologies and techniques. For example, the data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0221] The various example blocks and components described with respect to the disclosure herein may be implemented or performed using a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0222] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted via a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features implementing the functions may also be physically located in various locations, including being distributed such that parts of the functions are implemented in different physical locations.

[0223] Computer-readable media includes both non-transitory computer storage media and communication media, including any medium that enables transfer of a computer program from one place to another. Non-transitory storage media may be any available medium that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general purpose or special purpose computer or a general purpose or special purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included within the definition of computer readable media. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray disc, where disks typically reproduce data magnetically and discs reproduce data optically using lasers. Combinations of the above are also included within the scope of computer readable media.

[0224] As used herein, including within the claims, "or" as used in a list of items (e.g., a list of items beginning with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, such as, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also, the phrase "based on" as used herein should not be construed as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, the phrase "based on" as used herein is to be construed similarly to the phrase "based at least in part on."

[0225] In the accompanying figures, similar components or features may have the same reference label. Furthermore, various components of the same type may be distinguished by following the reference label with a dash and a second label that distinguishes the similar components. If only a first reference label is used herein, the description is applicable to any of the similar components having the same first reference label, regardless of the second reference label, or any other subsequent reference label.

[0226] The description set forth herein with respect to the accompanying drawings describes exemplary configurations and does not necessarily represent all examples that may be implemented or fall within the scope of the claims. As used herein, the term "exemplary" means "serving as an example, instance, or illustration" and does not mean "preferred" or "advantageous over other examples." The detailed description includes specific details for the purposes of providing an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0227] The description in this specification is provided to enable any person skilled in the art to make or use the disclosure. Various modifications of the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein. [Explanation of symbols]

[0228] 100 Wireless communication system 105 Base station 110 Coverage Area 115 UE 120 backhaul links 125 Communication Links 130 Core Network 135 D2D communication links 140 Access Network Entity 145 Access Network Transmission Entity 150 IP Services 205 First Device 210 Second Device 215 Send 220 Channels 225 hourly units 230 Frequency Units 235 DMRS Resource Element 240 Other Resource Elements 305 DMRS QPSK Modulator 310 Controller 315 Data Encoder 320 Data Modulator 325 Resource Mapper 330 Resource Demapper 335 DMRS QPSK Demodulator 340 Controller 345 Data Demodulator 350 Data Decoder 505 Devices 510 Receiver 515 Transmitter 520 Communications Manager 605 Devices 610 Receiver 615 Transmitter 620 Communications Manager 625 Data Identifier 630 Sequence Generator 635 Resource Element Transmitter 720 Communications Manager 725 Data Identifier 730 Sequence Generator 735 Resource Element Transmitter 740 Resource Element Indicator Transmitter 745 Pilot Resource Element Identifier 750 Modulation Components 755 Constellation Point Identifier 760 Scale Value Determinator 765 Constellation Point Selection Component 770 Configuration Signaling Transmitter 805 Devices 810 I / O Controller 815 Transceiver 820 Communications Manager 825 Antenna 830 Memory 835 Code 840 Processor 845 Bus 905 Devices 910 Receiver 915 Transmitter 920 Communications Manager 1005 Devices 1010 Receiver 1015 Transmitter 1020 Communications Manager 1025 Resource Element Receiver 1030 Decryption Component 1035 DPoD Components 1120 Communications Manager 1125 Resource Element Receiver 1130 Decryption Component 1135 DPoD Components 1140 Resource element indicator receiver 1145 Resource Element Identification Component 1205 Devices 1210 Network Communications Manager 1215 Transceiver 1220 Communications Manager 1225 Antenna 1230 Memory 1235 Code 1240 Processor 1245 Inter-Station Communication Manager 1250 Bus

Claims

1. 1. A method for wireless communication in a first wireless device, comprising: identifying a set of data resource elements for transmitting data in one or more symbol periods; generating, for the one or more symbol periods based at least in part on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, the sequence of the set of pilot resource elements including a demodulation reference signal; identifying a set of constellation points associated with pilot resource elements of said set of pilot resource elements; determining a value of the measure for the pilot resource elements for each constellation point of the set of constellation points; selecting a constellation point of the set of constellation points for the pilot resource element based at least in part on determining the value of the measure for each constellation point of the set of constellation points; and transmitting, to a second wireless device in the one or more symbol periods, the set of data resource elements and the set of pilot resource elements associated with the set of data resource elements, wherein transmitting the set of pilot resource elements is based at least in part on selecting the constellation point.

2. 10. The method of claim 1, further comprising: transmitting to the second wireless device an indication of a first subset of the set of pilot resource elements, the first subset of the set of pilot resource elements not including at least one pilot resource element of the set of pilot resource elements, and transmitting the set of pilot resource elements based at least in part on transmitting the indication of the first subset of the set of pilot resource elements.

3. the transmitting of the indication of the first subset of the set of pilot resource elements; transmitting configuration signaling identifying the first subset of the set of pilot resource elements; transmitting the configuration signaling identifying the first subset of the set of pilot resource elements, The method of claim 2, preferably comprising the step of transmitting a demodulation reference signal configuration that identifies said first subset of said set of pilot resource elements.

4. 4. The method of claim 1, further comprising identifying a first subset of the set of pilot resource elements that does not include a second subset of the set of pilot resource elements, and wherein transmitting the set of pilot resource elements is based at least in part on identifying the first subset of the set of pilot resource elements.

5. generating the sequence, 4. The method of claim 1, further comprising: selecting the sequence from a set of sequences; and transmitting the set of pilot resource elements based at least in part on selecting the sequence from the set of sequences.

6. the sequence is selected from the set of sequences based at least in part on a measure of the sequence satisfying a threshold; The measure preferably comprises a percentile peak value; The method of claim 5 , wherein satisfying the threshold comprises the percentile peak value being above the threshold.

7. each sequence in the set of sequence candidates has an associated value of a measure; 6. The method of claim 5, wherein the sequence is selected from the set of sequences based at least in part on the associated value of the measure of the sequence having a lowest or highest value compared to the values ​​of the measure of each of the other sequences in the set of candidate sequences.

8. 4. The method of claim 1, further comprising modulating each pilot resource element of the set of pilot resource elements using quadrature phase shift keying, and transmitting the set of pilot resource elements is based at least in part on the modulating step.

9. identifying a second set of constellation points associated with a second pilot resource element of the set of pilot resource elements; determining a second value of the measure for the second pilot resource element for each constellation point of the second set of constellation points; 4. The method of claim 1, further comprising: selecting, for the second pilot resource elements, a second constellation point from the second set of constellation points based at least in part on determining the second value of the measure for each constellation point of the second set of constellation points, wherein transmitting the set of pilot resource elements is based at least in part on selecting the second constellation point.

10. 10. The method of claim 9, further comprising identifying a first subset of the set of pilot resource elements that does not include a second subset of the set of pilot resource elements, the second subset of the set of pilot resource elements including a first pilot resource element and the second pilot resource element.

11. 11. The method of claim 10, further comprising, for each pilot resource element of the second subset of the set of pilot resource elements, selecting a respective constellation point of the respective set of constellation points based at least in part on determining a respective value of the measure for each constellation point of a respective set of constellation points, wherein transmitting the set of pilot resource elements is based at least in part on selecting the respective constellation point for each pilot resource element of the second subset of the set of pilot resource elements.

12. 12. The method of claim 11, further comprising: refraining from determining a respective value of the measure for each pilot resource element of the first subset of the set of pilot resource elements, and wherein transmitting the set of pilot resource elements is based at least in part on the refraining.

13. The measure comprises a percentile peak, and the step of selecting the constellation points comprises: for each constellation point of the set of constellation points, determining a percentile peak value over a symbol period that overlaps in time with a first pilot resource element; and selecting a first constellation point of the set of constellation points associated with a percentile peak value higher than a percentile peak value of a second constellation point of the set of constellation points.

14. 14. The method of claim 13, wherein the first constellation point is associated with a highest percentile peak of each constellation point in the set of constellation points.

15. 1. An apparatus for wireless communication in a first wireless device, comprising: A processor; a memory coupled to the processor; and instructions stored in the memory, the instructions causing the device to: Identifying a set of data resource elements for transmitting data in one or more symbol periods; generating, for the one or more symbol periods based at least in part on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, the sequence of the set of pilot resource elements including a demodulation reference signal; identifying a set of constellation points associated with pilot resource elements of the set of pilot resource elements; determining a value of the measure for the pilot resource elements for each constellation point of the set of constellation points; selecting a constellation point of the set of constellation points for the pilot resource element based at least in part on determining the value of the measure for each constellation point of the set of constellation points; transmitting, to a second wireless device in the one or more symbol periods, the set of data resource elements and the set of pilot resource elements associated with the set of data resource elements, wherein transmitting the set of pilot resource elements is based at least in part on selecting the constellation point; The apparatus is executable by the processor to cause

Images