Abstract: A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive a radio signal including downlink reference signals. The processor estimates an explicit CSI, selects a Doppler-delay precoder matrix for a composite Doppler-delay-beam three-stage precoder, calculates and reports to the transmitter a CSI feedback. The communication device selects from one or more codebooks a subset of D delay components and/or a subset of F Doppler-frequency components and uses the selected subset of delay components for each polarization and each spatial beam and/or the selected subset of Doppler-frequency components for each polarization, each spatial beam and each delay, when calculating the Doppler-delay precoder matrix.

Abstract: A signal estimation apparatus classifies reception signal components included in a reception signal y and transmission signal components included in a transmission signal into a plurality of signal groups in accordance with a degree of a correlation between the reception signal component and the transmission signal component, on the basis of system information, sets, for each signal group, parameters ?, ?, ? and ? that specifies a detail of a signal estimation method to be either one of a learned value that is learnable by a learning operation and a fixed value that is independent from the learning operation, and estimates, for each signal group, an estimation signal xe that is an estimated value of the transmission signal from the reception signal by using the signal estimation method specified by the set parameter.

Abstract: A method and a system for downlink pre-coding in cloud radio access networks uses a baseband unit, a number of remote radio heads, and a number of user equipments. The baseband unit determines a received signal expression for each user equipment based on system parameters and channel state information, and determines a sum rate expression which may be achievable for downlink transmission based on the received signal expression. The baseband unit then sets up a constrained optimal problem expression subject to a maximum transmitting power of each remote radio head with an objective function of sum rate maximization based on the achievable sum rate expression, and finally determines optimal solutions for the constrained optimal problem where the optimal solutions comprise downlink pre-coding used for downlink transmission.

Abstract: One apparatus may be configured to transmit a set of reference signals on shared resources of a first communication link and a second communication link, the set of reference signals indicating an interference channel on the shared resources. The apparatus may further communicate data or control information on the first communication link following transmission of the set of reference signals. Another apparatus may be configured to detect a signal on shared resources of a first communication link and a second communication link, the signal being indicating an interference channel on the shared resources. The other apparatus may further perform channel estimation on the interference channel based on detecting the signal. The other apparatus may further communicate data or control information on the first communication link based on the channel estimation on the interference channel.

Abstract: Pre-coding methods are disclosed for a transmitter node and for a receiver node, respectively. The transmitter node and/or the receiver node comprises at least one hardware component causing signal distortion for a forward channel and/or a reverse channel Transmitter node reference signals are transmitted by the transmitter node and received by the receiver node, wherein the transmitter node reference signals result from use of a transmitter node transmission pre-coding setting and an allocated transmission power. The receiver node estimates a forward channel disturbance component (including the signal distortion for the forward channel), selects a receiver node reception pre-coding setting based on the estimated forward channel disturbance component, and updates a receiver node transmission pre-coding setting by using the selected receiver node reception pre-coding setting as receiver node transmission pre-coding setting.

Abstract: Systems, methods, apparatuses, and computer program products for non-linear precoding are provided. One method may include combining, by a network node, of linear and non-linear precoding, for example based on specific channel state information acquisition from at least one user equipment, and generating two types of demodulation reference signals for the concatenated linear and non-linear precoding. The method may include multiplexing, by the network node, the two types of demodulation reference signals with data. A first of the two types of demodulation reference signals may be linearly precoded with one linear precoding matrix from a first-stage linear precoder, and another one of the two types may be linearly precoded with both the first-stage linear precoder and a feedforward filter in a second-stage non-linear precoder from the concatenation of linear and nonlinear precoders.

Abstract: The present disclosure relates to method and apparatus for multiple panel and/or multiple beam codebook based PUSCH transmissions. The method includes receiving, at a User Equipment (UE), Downlink Control Information (DCI) including two or more sets of parameters; and performing codebook based Physical Uplink Shared Channel (PUSCH) transmission for transmitting the two or more codewords according to the two or more sets of parameters, respectively; wherein each of the two or more sets of parameters includes at least one of a Sounding Reference Signal Resource Indicator (SRI), a Transmitted Precoding Matrix Indicator (TPMI), a Modulation Coding Scheme (MCS), a New Data Indicator (NDI) and a Redundancy Version (RV).

Abstract: Some embodiments of this disclosure provide a method for determining an index of an orthogonal basis vector and a device. The method includes: receiving position information, where the position information is associated with an orthogonal basis vector; and determining at least one first index set based on the position information, where the first index set represents a set of column indices of a plurality of orthogonal basis vectors in an orthogonal basis matrix.

Abstract: A method, system and apparatus for realizing FD_MIMO in codebook-based transmissions. The method, system and apparatus include the combing of one or more horizontal codebooks and one or more vertical codebooks. A 2D beamformer for downlink transmissions is generated based on the combination of the one or more horizontal codebooks and one or more vertical codebooks.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station, a control message identifying a frequency hop configuration that configures the UE to use frequency hopping when transmitting repetitions of an uplink control channel transmission. The UE, the base station, or both may determine, based on the UE being configured with the frequency hop configuration, a frequency hop for each repetition of the uplink control channel transmission. Each frequency hop may be determined based on a corresponding uplink control channel index for a respective repetition a frequency hop for each repetition of the uplink control channel transmission. The uplink control channel index may be an uplink transmission occasion index, or a repetition index. The UE may transmit the repetitions of the uplink control channel transmission using respective frequency hops in accordance with the determination and the frequency hop configuration.

Abstract: Described herein are embodiments related to first-pass continuous read level calibration (cRLC) operations on memory cells of memory systems. A processing device determines that a first programming pass of a programming operation has been performed on a memory cell of a memory component. The processing device performs a cRLC operation on the memory cell to calibrate a read level threshold between a first first-pass programming distribution and a second first-pass programming distribution before a second programming pass of the programming operation is performed on the memory cell.

Abstract: Techniques for wireless communications are described. A communication device may support processing digital post distortion using additional references symbols. For example, the communication device may precode a signal including at least two reference symbols for a single-layer transmission using at least two antenna ports. At least one reference symbol of the at least two reference symbols is associated with at least one data symbol of a data stream. The communication device may estimate, based on the at least two reference symbols, a nonlinearity model of at least two power amplifiers associated with the single-layer transmission, and determine an estimate of a nonlinearity factor of the precoded signal based on the estimated nonlinearity model. As a result, the communication device may eliminate or reduce the nonlinear factor of the precoded signal based on the estimated nonlinearity model of the at least two power amplifiers and the estimated channel impulse response.

Abstract: Embodiments of the present disclosure provide a method of processing received signal using a massive MIMO base station (BS). The BS comprises a radio unit (RU), a distributed unit (DU) and an interface. The method comprises receiving a plurality of signals corresponding to the plurality of antennas, said signals comprises at least one of data signals, demodulation reference signals (DMRS) and sounding reference signals (SRS). The RU or DU performs a grouping operation on a subset of the plurality of signals corresponding to a subset of antennas to generate signal groups. The RU performs a first stage filtering on the signals associated with each group using group specific filters to obtain group specific filtered signals. The DU performs a second stage filtering on the group specific filtered signals to obtain second stage filtered signals.

Abstract: The described techniques relate to improved methods, systems, devices, or apparatuses that support channel state information feedback for semi-open-loop and open-loop schemes. The described techniques provide for a user equipment (UE) to determine an open-loop, semi-open-loop, or closed-loop transmission scheme for deriving channel quality information (CQI). In the case of determined open-loop transmission scheme, the UE may select a transmission scheme corresponding to a time offset value and a precoder cycling granularity value. The UE may determine one or more of a time offset value, a precoder cycling granularity value, and a precoding matrix indicator (PMI) for a channel state information (CSI) report, and generate CQI accordingly. Additionally, the UE may include the determined values in the CSI report to indicate the transmission scheme used for the CQI derivation. Based on the CQI, the base station can then determine the transmission scheme and perform link adaption accordingly.

Abstract: A method of detecting a signal in a wireless communication system supporting multiple-input multiple-output (MIMO) is provided. The method includes obtaining a MIMO channel matrix between a transmission end and a reception end and a reception vector received by the reception end, identifying a modulation scheme of the transmission end, applying a preset equation modification scheme to the MIMO channel matrix and the reception vector according to the identified modulation scheme, and detecting a transmission vector of the transmission end by performing quantum calculation on the modified MIMO channel matrix and the modified reception vector.

Abstract: Disclosed is an electronic device and control method for changing an antenna setting according to a bandwidth of a signal. An electronic device according to various embodiments of the present document may comprise at least one antenna, an antenna tuning circuit, and a processor, wherein the processor is configured to: receive signals from a plurality of external devices according to a first antenna setting by using the at least one antenna, respectively; check received power intensities of the received signals, respectively; when the checked received power intensities are equal to or greater than a predesignated threshold intensity, identify a ratio of a signal having a maximum bandwidth from among the signals received from the plurality of external devices; and at least partially on the basis of the identified ratio, change the first antenna setting to a second antenna setting by using the antenna tuning circuit.

Abstract: A wireless communication device includes a transmission radio frequency (RF) chain configured to transmit a radio signal, and processing circuitry configured to cause the wireless communication device to detect that the transmission RF chain has transited from an inactive state to a first active state, determine whether to detect an updated value of a phase of a self-interference signal in response to detecting that the transmission RF chain has transited from the inactive state to the first active state, and modify a weight vector of an adaptive filter corresponding to the self-interference signal based on the updated value of the phase or a previous value of the phase.

Abstract: A mechanism of modulation in a more appropriate spatial domain is to be provided. A transmission device includes a signal processing unit that applies a precoding matrix on the basis of a first bit sequence to a complex signal point sequence converted from a second bit sequence, and the precoding matrix applied to the complex signal point sequence corresponds to the first bit sequence in a predetermined combination of a first bit sequence candidate and each element of a set of precoding matrices.

Abstract: Embodiments of this application provide example information receiving methods and receiving apparatuses. One example information receiving method includes receiving, by a receiving apparatus, an index from a sending apparatus, wherein the index indicates precoding information used for a single codeword. The receiving apparatus can then determine, based on the index, the precoding information used for the single codeword.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer readable mediums for reducing channel state information (CSI) feedback overhead. In example embodiments, a method implemented at a terminal device includes receiving a codebook configuration and a reference signal from a network device the codebook configuration indicating at least one codebook subset restriction (CBSR); determining, based on reference signal at least one precoding matrix indicator (PMI) associated with a plurality of beams of a set of beams between the terminal device and the network device selected at least partially based on the at least one CBSR; and transmitting the at least one PMI to the network device.