Abstract: Methods, systems, and devices for wireless communications are described that provide a repeater for beamforming a received signal at a millimeter wave (mmW) radio frequency via one or more scan angles or beamforming directions and then retransmitting and beamforming the signal at the mmW radio frequency. Repeaters may include analog and digital components for downconverting on the received signal to reduce a frequency of the signal from the mmW frequency to an intermediate frequency (IF) or baseband frequency, and then filtering the downconverted signal to reduce interference. The filtering may include digital filtering or a combination of analog and digital filtering, in which a set of filter coefficients for the digital filtering is selected based on beamforming parameters used to receive the signal, retransmit the signal, or both. The repeater may then upconvert the filtered signal back to the mmW frequency for the retransmission of the signal.

Abstract: Methods, systems, and devices for wireless communications are described. A base station may identify an intelligent reflecting surface device for communications with a user equipment. The base station may determine a reference signal configuration based on the identified intelligent reflecting surface device. The reference signal configuration may include a first set of parameters associated with the intelligent reflecting surface device. The base station may transmit, to the UE, the intelligent reflecting surface device, or both, one or more reference signals in accordance with the first set of parameters. The base station may identify a second set of parameters associated with one or more reflecting elements of the intelligent reflecting surface device.

Abstract: Methods, systems, and devices for wireless communications are described that provide a repeater for beamforming a received signal at a first radio frequency via one or more scan angles or beamforming directions and then retransmitting and beamforming the transmitted signal at the first radio frequency via one or more scan angles or beamforming directions. Repeaters may perform heterodyning or downconverting on the received signal to reduce a frequency of the signal from the first frequency to an intermediate frequency (IF), and then band-pass filter the IF signal around a desired center frequency. The repeater may then heterodyne or upconvert the filtered IF signal back to the first frequency for the retransmission of the signal.

Abstract: Aspects described herein relate to receiving, at a repeater and from a serving base station, one or more transmitted downlink beams, receiving, at the repeater and from a downstream node served by the serving base station, one or more transmitted uplink beams, and transmitting, to the serving base station, one or more parameters related to determining a channel quality metric using at least the one or more transmitted downlink beams and the one or more transmitted uplink beams.

Abstract: A relay supporting multiple relay modes is provided. The relay transmits capability information to a base station, the capability information indicating support for a first relay mode and a second relay mode. The relay determines a mode of operation, either on its own or based on an indication of a mode of operation from the base station, wherein the mode of operation comprises the first relay mode or the second relay mode. The relay communicates with at least one of the base station or another wireless device based at least in part on the determined mode of operation.

Abstract: Certain aspects of the present disclosure provide techniques and architectures for the use of multiple antenna technology which may enable a wireless communication system to exploit the spatial domain to support spatial multiplexing, beamforming, and transmit diversity over a wide frequency range and/or multiple bands to communicate with multiple users.

Abstract: A transmission module is provided that includes a transmitter, a loopback receiver, and a QEC controller. The QEC controller identifies quadrature imbalance in the transmitter based at least one a comparison of the data signals at the output of the loopback receiver with data signals at the input of the transmitter. Based on the comparison, the QEC controller can adjust one or more characteristics of the transmitter to correct quadrature errors in the transmitter.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a millimeter wave repeater may communicate with a base station using a first set of antennas and a first beamforming configuration for the first set of antennas, the first beamforming configuration being selected from a beamforming codebook that includes multiple beamforming configurations; and communicate with one or more user equipments (UEs) using a second set of antennas and a second beamforming configuration for the second set of antennas, the second beamforming configuration being a fixed configuration that does not change for different communications between the second set of antennas and the one or more UEs. Numerous other aspects are provided.

Abstract: Disclosed are techniques for non-line-of-sight (NLOS) target detection. In an aspect, a source vehicle receives, from a roadside unit (RSU), a notification that the RSU is capable of repeating radar signals transmitted by the source vehicle in NLOS directions from the source vehicle, receives, from an active radar repeater associated with the RSU, radar signals for a radar beam sweep in at least one NLOS direction from the source vehicle, receives an angle of each beam of the radar beam sweep, and performs target object detection based on the radar signals for the at least one NLOS direction and the angle of each beam of the radar beam sweep. Example architectures for the active radar repeater are also disclosed.

Abstract: Certain aspects of the present disclosure provide systems and techniques for full-duplex communication. A first system is characterized by techniques for communicating in full-duplex utilizing the Butler matrix beamformer for generating a spatial beam to be used for both uplink and downlink signaling, wherein the signaling utilizes the same time and frequency resources. A second system is characterized by techniques for communicating in full-duplex utilizing the Butler matrix beamformer to generate two spatial beams, one to be used for downlink and one to be used for uplink signaling, wherein the signaling utilizes the same time and frequency resources. Accordingly, the systems and techniques described herein are directed to low complexity, multi-user full-duplex communications.

Abstract: A relay supporting multiple relay modes is provided. The relay transmits capability information to a base station, the capability information indicating support for a first relay mode and a second relay mode. The relay determines a mode of operation, either on its own or based on an indication of a mode of operation from the base station, wherein the mode of operation comprises the first relay mode or the second relay mode. The relay communicates with at least one of the base station or another wireless device based at least in part on the determined mode of operation.

Abstract: Certain aspects of the present disclosure provide a method for changing a beam pair utilized by a user equipment (UE) for communicating over a full-duplex frequency channel. The method includes establishing full-duplex communication with a base station (BS) utilizing a first beam pair comprising a first uplink beam and a first downlink beam utilized by the UE for the full-duplex communication. The method also includes transmitting a first signal to the BS, the first signal comprising a request to change the first beam pair. The method also includes receiving, via the first downlink beam, a second signal responsive to the request, the second signal configured to enable the UE to change from the first beam pair to a second beam pair and maintain full-duplex communication with the BS, wherein the second beam pair includes one or more of a second uplink beam or a second downlink beam.

Abstract: Methods, systems, and devices for wireless communications are described. A resource type associated with a transmission to be relayed by a wireless repeater may further be associated with a corresponding likelihood for subsequent forwarding activity (e.g., a corresponding likelihood a base station may send subsequent control information for configuring the wireless repeater to forward additional communications subsequent to the relayed transmission). Therefore, based on a resource type associated with a transmission configured by a wireless repeater configuration from a base station, a wireless repeater may efficiently configure a control interface, and control channel monitoring, subsequent to configured relay operations.

Abstract: Methods, systems, and devices for wireless communications are described. For example, the described techniques provide for wireless device (e.g., wireless repeater, wireless relay device, smart repeater, etc.) operation in a low power state, and base station signaling for triggering of wireless repeater control interface configuration. For example, a wireless repeater may operate in a power saving mode and monitor for control information from a base station according to a low power state or a slow state (e.g., according to a long monitoring periodicity relative to a monitoring periodicity associated with a full power state or fast state). Upon detection of triggering signal from a base station, the wireless repeater may transition to monitoring for control information from the base station according to a fast state (e.g., according to a short, or more frequent, monitoring periodicity relative to a monitoring periodicity associated with a low power state).

Abstract: Methods, systems, and devices for wireless communications are described. The described techniques relate to improved methods, systems, devices, and apparatuses that support power saving of wireless repeaters. Generally, the described techniques provide for wireless device (e.g., wireless repeater, wireless relay device, etc.) power savings in the absence of an attached (e.g., connected) user equipment (UE). For example, a wireless repeater may operate in a power saving mode and monitor for control information from a base station according to a slow state (e.g., according to a relatively long monitoring periodicity). Upon detection of possible UE attachment to the base station (e.g., upon detection of a random access channel (RACH) message), the wireless repeater may transition to monitoring for control information from the base station according to a fast state (e.g., according to a relatively short, or more frequent, monitoring periodicity).

Abstract: Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums to enhance the functionality of directional repeaters (wireless devices that relay directional wireless signals). For example, by adding even limited capability to buffer digital samples, repeater functionality may be enhanced to provide better coverage and make more efficient use of time, frequency, and spatial resources. An example method generally includes receiving, from a base station, a configuration indicating how the wireless device is to process stored digital samples of a first radio frequency (RF) signal, receiving the first RF signal, wherein the receiving comprises generating the digital samples of the first RF signal, storing the digital samples, and processing the stored digital samples according to the configuration.

Abstract: The described techniques relate to improved methods, systems, devices, and apparatuses that support modem control using millimeter wave (mmW) energy measurement. Generally, the described techniques provide for wireless device (e.g., wireless repeater) power savings in the absence of an attached (e.g., connected) user equipment (UE). For example, a wireless repeater may perform relay operations (e.g., amplification and forwarding operations) for communications between a base station and a UE in some channel (e.g., in a mmW channel). The wireless repeater may use energy measurements in the channel (e.g., analog mmW measurements) to control or configure a digital interface for monitoring out of band control information (e.g., in a sub-6 gigahertz (GHz) channel). For example, a wireless repeater may use energy measurements of signals transmitted by devices in a mmW band to configure (e.g., turn on) a digital interface of another modem to monitor for control information in a sub-6 GHz band.

Abstract: An apparatus is disclosed for implementing a flexible beamforming architecture. In an example aspect, the apparatus comprises an antenna array comprising a first antenna element with a first feed port and a second antenna element with a second feed port. The apparatus also comprises a wireless transceiver with a first dedicated transceiver path coupled to the first feed port and a second dedicated transceiver path coupled to the second feed port. The wireless transceiver also comprises a flexible beamforming network configured to selectively be in a first configuration that couples both the first dedicated transceiver path and the second dedicated transceiver path to a first intermediate transceiver path of the wireless transceiver, and be in a second configuration that connects the first dedicated transceiver path to the first intermediate transceiver path and connects the second dedicated transceiver path to a second intermediate transceiver path of the wireless transceiver.

Abstract: Certain aspects of the present disclosure provide techniques and architectures for the use of multiple antenna technology which may enable a wireless communication system to exploit the spatial domain to support spatial multiplexing, beamforming, and transmit diversity over a wide frequency range and/or multiple bands to communicate with multiple users.

Abstract: Methods, systems, and devices for wireless communications are described in which RF-domain wireless routers may repeat, extend, or redirect beamformed wireless signals received from one or more transmitters to one or more receivers. The router may receive transmissions at a mmW frequency using a first array of antenna elements, and provide the transmissions to a beamforming network, such as a Butler matrix, that outputs one or more a signals to a switching network. The switching network may perform switching to provide the one or more signals to desired inputs of an output beamforming network that outputs beamformed transmission beams via a second array of antenna elements.