Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive signaling that schedules a shared channel and indicates a set of demodulation reference signal (DMRS) ports scheduled for the UE, the signaling including a field for conveying an indicator of a co-scheduled UE for the set of DMRS ports. The UE may communicate a set of DMRSs based at least in part on the signaling. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communication are described. For example, the described techniques provide for a wireless device transmitting an initial transmission associated with a data payload, such as a hybrid automatic repeat request (HARQ) payload. The initial transmission may include a set of bits modulated using a first bit ordering scheme, and the set of bits may include a first bit subset that are transmitted with a lower transmission reliability than a second bit subset of the set of bits. The wireless device may modulate the first bit subset using a second bit ordering scheme that differs from the first bit ordering scheme to generate a modulated bit set. The second bit ordering scheme may be associated with a higher transmission reliability for the first bit subset. The wireless device may transmit the second transmission for the data payload with the modulated bit set.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support power allocation or resource allocation for non-orthogonal multiple access (NOMA). In a first aspect, a method of wireless communication includes a user equipment (UE) randomly selecting a parameter value associated with a power level of multiple power target levels, and transmitting, to a network entity and using the power level, an uplink communication. In a second aspect, a method of wireless communication includes a UE receiving, from a network entity, an indicator that indicates multiple resource candidates, each resource candidate of the multiple resource candidates overlaps with at least one other resource candidate of the multiple resource candidates, and transmitting, to the network entity and using a resource candidate of the multiple resource candidates, an uplink communication. Other aspects and features are also claimed and described.

Abstract: Methods and apparatuses for wireless communication for line-of-sight Multiple-Input-Multiple-Output (LOS MIMO) are described. A first pilot signal is transmitted to a second device. The first pilot signal is at least one of a constant phase pilot or a linear phase ramped pilot for estimating a misalignment of a second antenna array of the second device with respect to a first antenna array of the first device.

Abstract: An apparatus for wireless communication is provided. The apparatus may be a network node. The apparatus receives a set of uplink transmissions from a set of user equipments (UEs) via a first resource of a non-orthogonal channel, wherein the apparatus is unable to decode the set of uplink transmissions. The apparatus transmits a retransmission request to a subset of the set of UEs. The apparatus receives a retransmission of a first uplink transmission in the set of uplink transmissions via a second resource of the non-orthogonal channel in response to the retransmission request. The apparatus decodes a second uplink transmission in the set of uplink transmissions based on at least the retransmission of the first uplink transmission.

Abstract: An antenna offset compensation determination method includes: transmitting, from a first apparatus to a second apparatus, one or more first signals from a first plurality of antenna elements, of a first antenna of the first apparatus, and one or more second signals from a second plurality of antenna elements, of the first antenna; receiving, at the first apparatus from the second apparatus, one or more first indications of a first linear offset of a first signal distinction line relative to a second antenna of the second apparatus, the first signal distinction line corresponding to a first transition between the one or more first signals and the one or more second signals as received by the second antenna; and determining, based on the first linear offset, one or more compensation parameters for compensating for the first linear offset.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive control signaling indicating a demodulation reference signal (DMRS) configuration for an uplink message that may indicate for the UE to refrain from including DMRS in at least a first portion of the uplink message based on the DMRS configuration. The UE may encode the uplink message without the DMRS in at least the first portion of the uplink message in accordance with the DMRS configuration. The UE may transmit the uplink message based on encoding the uplink message, and a network entity may receive and decode the uplink message. In some examples, the network entity may receive signaling that includes a set of uplink messages from different UEs. As such, the network entity may decode each, using a respective Reed-Muller (RM) code in accordance with a multi-user decoding algorithm.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a mobile station may receive a medium access control (MAC) control element (MAC CE) indicating a MAC CE configuration associated with a sounding reference signal (SRS) resource. The mobile station may receive downlink control information (DCI) indicating a DCI configuration associated with the SRS resource. The mobile station may selectively transmit SRS information associated with the SRS resource based at least in part on a time of receipt of the MAC CE. Numerous other aspects are provided.

Abstract: Certain aspects relate to techniques for estimating and compensating for antenna array rotation of a wireless node. For example, the antenna array of the wireless node may rotate about one or more of an x-axis, a y-axis, and a z-axis, which may misalign the antenna array relative to another antenna array of another wireless node, causing degradation of communications between the two nodes. In some examples, the wireless node may obtain, from a first antenna array of the other wireless node via a second antenna array of the first wireless node, a first pilot signal and a second pilot signal via a first beam. In some examples, the first wireless node may perform a first alignment compensation based on a phase difference between the first pilot signal and the second pilot signal.

Abstract: Certain aspects relate to techniques for z-axis rotation estimation for compensating signaling transmitted between two or more nodes over a wireless channel where an antenna array of at least one of the nodes is misaligned about the z-axis relative to another node. For example, a transmitting node may transmit pilot signals defined by phase shifts to provide a receiving node with a basis for estimating the angle of rotation by which the antenna arrays are misaligned. The transmitting node may then take remedial action to address the misalignment based on the estimation.

Abstract: Aspects relate to sounding on a subset of available sounding resources. A user equipment (UE) may transmit a sounding reference signal (SRS) on a subset of the frequency resources available for a hop of an SRS hopping sequence. A UE may be configured to use a subset of frequency resources or the UE may autonomously identify this subset. A base station may send a bit map to a UE to indicate the subset of resources to use for a hop. Each bit of the bit map may indicate that the UE is to transmit an SRS on a particular RB or on a particular groups of RBs. The same subset of resources may be designated for each hop or different subsets of resources may be designated for different hops. An indication of the subset of resources may be provided for each hop. The subset of resources may be cycled for different hops.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may generate a Legendre precoder for transmission on a multiple-input multiple-output channel based at least in part on computing Legendre polynomials for a quantity of transmit antennas. The wireless communication device may transmit a communication using the Legendre precoder. Numerous other aspects are provided.

Abstract: Aspects of the disclosure relate to the use of enhanced downlink control information to communicate partial frequency sounding configuration to user equipment (UE). A UE may receive a partial frequency sounding configuration generated for the UE the downlink control information, transmit a sounding reference signal (SRS) in one or more resources configured for SRS transmission in a bandwidth used by the UE, the one or more resources being identified by the partial frequency sounding configuration, and refrain from transmitting in a portion of a set of resources configured for SRS transmission in the bandwidth used by the UE. A format for the enhanced downlink control information may be based on standards defined the downlink control information formats.

Abstract: A configuration to allow for an SRS resource set trigger list configuration to be updated using MAC-CE. The apparatus transmits, to a UE, an SRS resource set trigger list configuration via RRC signaling. The apparatus transmits, to the UE, an updated trigger list value via MAC-CE to update the SRS resource set trigger list configuration. A trigger state of at least one SRS resource set is updated based on the updated trigger list value. The apparatus receives, from the UE, at least one SRS based on the updated SRS resource set trigger list configuration.

Abstract: Methods, systems, and devices for wireless communications are described. A first wireless device may identify a translational or rotational misalignment between a first antenna array of the first wireless device and a second antenna array of a second wireless device that is in line-of-sight (LoS) wireless communication with the first wireless device via a channel. The first wireless device may update a channel matrix for the channel based on the translational or rotational misalignment, where the first wireless device may update the channel matrix with one or more beam steering metrics of the first antenna array so as to improve a beam alignment between the first antenna array and the second antenna array. The first wireless device may communicate with the second wireless device in accordance with the updated channel matrix.

Abstract: In some scenarios, SRS transmission over the full SRS bandwidth may be unnecessary and/or inefficient. Therefore, a need exists for approaches to SRS transmission over less than the full SRS bandwidth. Described herein are techniques and solutions of SRS transmission using only a portion of the full SRS bandwidth, or a partial SRS bandwidth. The present disclosure provides for SRS transmission using a partial SRS bandwidth through sounding patterns that use only the partial SRS bandwidth and/or using a partial SRS bandwidth through various SRS sequence generation configured for the partial SRS bandwidth. An apparatus receives an SRS configuration indicating a full SRS bandwidth; determines a frequency hopping pattern for SRS transmission based on the SRS configuration, and the frequency hopping pattern is limited to a partial SRS bandwidth less than the full SRS bandwidth; and transmits the SRS transmission to the base station based on the frequency hopping pattern.

Abstract: Aspects for time bundling an SRS resource over a plurality of instances are disclosed. The apparatus may include a user equipment (UE). The user equipment may receive a configuration from a base station for time-bundling at least one sounding reference signal (SRS) resource. The time-bundling may be performed by the UE transmitting a plurality of SRS signals at different times using an identical center frequency and at least two different frequency resource allocations. The UE may transmit the plurality of SRS signals based on the configuration.

Abstract: The present disclosure describes the generation of long sequences from short sequences to support concurrent transmissions of large numbers of machine-type communication devices operating in a wireless communication system. These long sequences may be assigned to devices so that the devices can use the long sequences scramble their transmissions. The use of such long sequences permits many machine-type communication devices to transmit during the same time and frequency resource.

Abstract: Methods, systems, and devices for wireless communications are described. A first wireless device may receive a request for beamforming information associated with line-of-sight (LoS) multiple input multiple output (MIMO) communication from a second wireless device. The first wireless device may generate a channel estimation matrix for a channel between rectangular antenna arrays of the respective wireless devices, the channel estimation matrix including one or more quadratic terms for the LoS MIMO communication. The first wireless device may generate a first sub-matrix and a second sub-matrix based on the channel estimation matrix. The first wireless device may transmit an indication of a set of precoders for the LoS MIMO communication, the set of precoders based on a symmetry associated with the first and second sub-matrices, and may receive the LoS MIMO communication from the second wireless device based on the set of precoders.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may generate a Legendre precoder for transmission on a multiple-input multiple-output channel based at least in part on computing Legendre polynomials for a quantity of transmit antennas. The wireless communication device may transmit a communication using the Legendre precoder. Numerous other aspects are provided.