1507 results about "Precoding" patented technology

Techniques pertaining to techniques for physical downlink shared channel (PDSCH) allocation in subband full duplex (SBFD) networks are described. Such techniques pertain to both PDSCH frequency domain resource allocation (FDRA) Type-0 and / or FDRA Type-1 and include the use of fractional resource block groups (RBGs), virtual resource block (VRB)-interleaving, canceling one or more repetitions or SPS transmission in a slot that is an SBFD slot or a non-SBFD slot. The techniques further include VRB-to-physical resource block (PRB) mapping that excludes one or more PRBs in the sequence of PRBs that belong to one or more UL-subband or one or more guard bands and applying one or more rules to provide for the selection of a wideband setting for a precoder resource block (RB) group (PRG) size with respect to use of a physical downlink shared channel (PDSCH) demodulation reference signal (DMRS).

A terminal device includes means for: receiving, from a network device, a port group configuration indicating at least two groups of antenna ports in a channel state information reference signal, CSI-RS, resource set including one or more CSI-RS resources, the at least two CSI-RS port groups being associated with at least two respective transmission reception points, TRPs, using coherent joint transmission, CJT, for downlink, DL, communication; receiving the one or more CSI-RS resources from the at least two TRPs having antenna ports belonging to the at least two respective CSI-RS port groups; determining, based on the one or more received CSI-RS resources, precoding parameters for DL precoding by the at least two respective TRPs, wherein said determining includes a separate determination of at least two port group-specific sets of precoding parameters specific to the at least two respective CSI-RS port groups.

Methods, systems, and devices for spectral sharing wireless systems, wherein multiple user devices share time and frequency resources for uplink and / or downlink transmissions, are described. One example method includes transmitting transmission symbols from the network station to at least one user device by processing through a first precoder and a pre-compensation stage, wherein the pre-compensation stage is selected to have the transmission symbols receivable at the at least one user device to appear as if the transmission symbols are processed by a second precoder different from the first precoder.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive configuration information associated with a first sounding reference signal (SRS) resource set and a second SRS resource set. The UE may receive downlink control information (DCI) that schedules a spatial division multiplexing (SDM) physical uplink shared channel (PUSCH) communication, the DCI including a plurality of fields associated with the SDM PUSCH communication. Numerous other aspects are provided.

The apparatus may be a wireless device configured to estimate, for a first transmission in a first slot, a first channel associated with the first transmission, wherein the first transmission is associated with a first precoding, receive, in a second slot following the first slot, a second transmission associated with a second precoding, and estimate, based on the received second transmission and at least one of the received first transmission or the estimated first channel, a second channel associated with the second transmission.

Codebook-based precoding determination methods and apparatuses, and a device and a storage medium, which relate to the field of mobile communications. A codebook-based precoding determination method comprises: according to determined channel information corresponding to each channel status information (CSI)-RS resource, and codebook parameter information, a terminal sending CSI to a network device, wherein the CSI comprises indication information corresponding to a plurality of CSI-RS resources and indication information corresponding to each CSI-RS resource, or indication information corresponding to a plurality of port groups in one CSI-RS resource and indication information corresponding to each port group, and the CSI is used for determining precoding for the terminal on the basis vector of a codebook structure corresponding to the codebook parameter information.

A method for determining a precoding resource block group (PRG), a method for indicating a precoding resource block group (PRG), and a user equipment are provided. The method for determining a precoding resource block group (PRG) includes: receiving, by a user equipment, first information, where the first information includes at least one of configuration information or indication information that is used for determining a PRG granularity; and determining, by the user equipment, a PRG granularity of at least one downlink (DL) subband in a subband full duplex (SBFD) mode based on the first information.

The invention discloses a pre-coding method and device for a cellular-free large-scale MIMO (Multiple Input Multiple Output) sensing integrated system, and the method comprises the steps: an access point provides a data service for a communication user through a downlink of the cellular-free large-scale MIMO sensing integrated system, and tracks a point-like sensing target from a reflection echo; the method comprises the following steps: calculating a downlink reachable rate of a communication user and a signal-to-noise ratio of a reflection echo, and constructing a problem function by taking maximization of the downlink sum rate of the communication user as a target and taking the signal-to-noise ratio of the reflection echo as a constraint; and solving the constructed problem function to obtain a precoding scheme of the system. According to the invention, on the premise of not introducing extra system energy consumption and guaranteeing the sensing performance, the trade-off relationship between the communication performance of the system and the display of the communication sensing performance can be greatly improved, so that the utilization efficiency of wireless spectrum resources is enhanced, and the integrity of the system is expanded and improved.

A UE receives DCI scheduling a PUSCH spanning multiple sub-bands, the DCI indicating a first precoder for a first resource grid of the PUSCH and a second precoder for a second resource grid of the PUSCH. The UE transmits the PUSCH with the first precoder at the first resource grid and with a third precoder at the second resource grid, the third precoder being based on a phase rotation of the second precoder. A base station transmits DCI scheduling a PUSCH spanning multiple sub-bands, the DCI indicating a first precoder for a first resource grid of the PUSCH and a second precoder for a second resource grid of the PUSCH. The base station receives the PUSCH with the first precoder at the first resource grid and with a third precoder at the second resource grid, the third precoder being based on a phase rotation of the second precoder.

Example precoding vector indication methods, precoding vector determining methods, and communications apparatus to reduce feedback overheads are described. One example method includes generating and sending a channel state information (CSI) report by a terminal device. A network device determines a precoding vector of one or more frequency domain units based on the CSI report. The CSI report is used to indicate M space-frequency units and a weighting coefficient of a part or all of the M space-frequency units, each of the M space-frequency units corresponds to one beam vector and one frequency domain vector, and a weighted sum of the part or all of the M space-frequency units is used to determine the precoding vector of the one or more frequency domain units.

A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive, from a transmitter a radio signal via a time-variant, frequency-selective MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration including a number of antenna ports, and downlink signals including the reference signal configuration; and a processor. The processor estimates an explicit CSI in the frequency domain using measurements on the downlink reference signals on the radio channel, selects a Doppler-delay precoder matrix (W) for a composite Doppler-delay-beam three-stage precoder, calculates either one or more of a channel quality indicator, CQI, and / or a precoder matrix indicator, PMI, and / or a rank indicator, RI, and reports to the transmitter the CSI feedback including either one or more of the CQI, and / or the PMI and / or the RI.

A terminal according to an aspect of the present disclosure includes a control section that determines whether or not to perform uplink shared channel transmission for an antenna selection TPMI precoder at full power on the basis of a reported full power transmission mode to be supported and a reported transmitted preceding matrix indicator (TPMI) group, and a transmitting section that performs the uplink shared channel transmission using the antenna selection TPMI precoder. According to one aspect of the present disclosure, it is possible to control full power transmission appropriately.

Embodiments of the present disclosure relate to methods and devices for wake-up signals. A method implemented at a network device comprises forming an OOK subsequence with multiple OOK symbols that comprise at least one OOK ON-symbol and at least one OOK OFF-symbol. The multiple OOK symbols are associated with one OFDM symbol. The method further comprises mapping the OOK subsequence into multiple pre-Discrete Fourier Transform (pre-DFT) subsequences respectively to form a pre-DFT sequence, and performing transform precoding on the pre-DFT sequence. The method further comprises mapping output of the transform precoding into frequency resources allocated to a Wake-up Signal (WUS) and generating the WUS, and transmitting to a terminal device the WUS.

The present disclosure relates to a method performed by user equipment (UE) in a wireless communication system. Particularly, the method comprises the steps of: receiving, from a base station (BS), downlink control information (DCI) for simultaneous transmission across multiple panels (STxMP); and on the basis of association information between a phase tracking (PT)-reference signal (RS) port and a demodulation (DM)-RS port included in the DCI, to the BS, transmitting a first PT-RS on a first PT-RS port and transmitting a second PT-RS on a second PT-RS port, wherein first information of the association information between the PT-RS port and the DM-RS port indicates a first DM-RS port associated with the first PT-RS port, from among DM-RS ports corresponding to at least one of a first sounding reference signal resource indicator (SRI) and first precoding information, and second information of the association information between the PT-RS port and the DM-RS port indicates a second DM-RS port associated with the second PT-RS port, from among DM-RS ports corresponding to at least one of a second SRI and second precoding information.

The invention discloses a signal transmission method and device based on orthogonal matrix precoding. The method comprises the steps that four chaotic sequences X, Y, Z and W are generated through a four-dimensional chaotic model according to a key initial value; performing bit interleaving on the original data by using X and W to obtain first data; performing serial-to-parallel conversion and QPSK mapping to obtain a mapping signal; scrambling the subcarriers and symbols of the mapping signals by using Y and Z to obtain encrypted data; carrying out IFFT (Inverse Fast Fourier Transform) on the encrypted data, adding a cyclic prefix, and carrying out parallel-serial conversion to obtain an encrypted data stream; performing binary conversion and serial-parallel conversion on the key initial value to obtain a square matrix K, and shaping the square matrix K by using a public key to obtain a key matrix; performing serial-to-parallel conversion, QPSK mapping, IFFT, cyclic prefix addition and parallel-to-serial conversion on the key matrix to obtain a key stream; and performing linear superposition on the encrypted data stream and the key stream through power distribution to obtain a power division multiplexing orthogonal frequency division multiplexing signal, and transmitting the power division multiplexing orthogonal frequency division multiplexing signal.

Provided is a method performed by a user equipment (UE). The method comprises: receiving, from a base station (BS), one or more messages comprising precoding information, wherein the precoding information is used by the UE to determine a precoder used in a codebook-based Physical Uplink Shared Channel (PUSCH) transmission; performing, by the UE, the codebook-based PUSCH transmission using eight antenna ports based on the precoder.

The invention discloses an LEO satellite power distribution and association method and system based on a cellular-free architecture in the technical field of wireless communication, and the method comprises the steps: carrying out the maximum ratio transmission precoding of all satellite access points, and generating a coding modulation signal; after the target users receive the coded modulation signals, receiving signals are formed at a receiving end, and the signal-to-interference ratio and the downlink transmission rate of each target user are calculated through the receiving signals; accumulating downlink transmission rates of all target users through a central satellite, and calculating system energy efficiency in combination with total power consumption of all satellite access points; and constructing an objective function with maximization of the system energy efficiency, solving the objective function through an iterative optimization algorithm under the constraint condition of a satellite transmitting power upper limit and a user-satellite coverage relationship, and determining an optimal power allocation and user-satellite association scheme. The method can adapt to the high-speed motion characteristic of the LEO satellite, and the system energy efficiency and the resource utilization rate are remarkably improved.

The invention discloses a multi-antenna joint precoding Gbit wireless transmission system, which relates to the technical field of wireless communication and comprises a frequency spectrum channel acquisition module, a signal preprocessing module, a precoding joint optimization module, a transmission performance evaluation module and a closed-loop parameter control module. The spectrum channel acquisition module acquires signal data and evaluates a transmission bit error rate and a signal-to-noise ratio by using a spectrum analyzer; the signal preprocessing module performs denoising and normalization and constructs a channel model; the precoding joint optimization module dynamically adjusts precoding and suppresses bit error diffusion; the transmission performance evaluation module calculates a data rate and optimizes protocol design; and the closed-loop parameter control module dynamically configures system parameters to guarantee closed-loop optimization. According to the method, the transmission efficiency and the stability of a Gbit wireless transmission system are remarkably improved, a complex channel environment is effectively dealt with, the bit error rate is reduced, the data rate is improved, a transmission protocol is optimized, intelligent dynamic adjustment of system parameters is realized, and the optimal performance of a multi-antenna joint precoding technology is ensured to be exerted.

Disclosed are example embodiments of systems, methods, and devices for enhancing reciprocity-based MU-MIMO performance in a wireless communication system. To incorporate devices with many antenna elements, extend the communication range, and reduce response and adaptation times single and multiple step dimensionality reduction schemes (which may also incorporate interference rejection) are constructed and applied at the UE antenna array. The UE Effective Antennas can be time-variable as well as their number be different from the information layer's number. The schemes parts can have different frequency-time supports and update rates. Methods to deliver from UEs the reduced dimension physical channel matrices to the BS to facilitate the MU-MIMO DL BS precoder construction are disclosed (including different D2A and A2D number cases). BS may optionally facilitate EAs selection. For equal downlink and uplink EAs parts, DL precoder construction may be further assisted via channel reconstruction from decoded uplink data (escaping channel ageing).

The present invention relates to a precoding indication method, an apparatus, and a storage medium, which relate to the technical field of communications, and are used for performing precoding indication enhancement while ensuring achieving flexibility of terminals. The method comprises: sending single downlink control information (S-DCI), the S-DCI being used for scheduling codebook-based PUSCH transmission of a terminal from a plurality of antenna panels to a plurality of transmission reception points (TRPs), the DCI of the S-DCI scheduling bearing an SRI indication domain, the SRI indication domain being used for indicating an SRS resource combination, which is used for the PUSCH transmission, in an SRS resource set corresponding to a PUSCH, and being used for indicating a spatial filter used when the terminal sends the PUSCH corresponding to the transmission opportunities (TOs) of different panels / TRPs / TCIs / PUSCHs.

Techniques used for uplink precoding scheme prediction and indication in wireless communication are disclosed. A user equipment (UE) can dynamically identify a predicted uplink precoding scheme for a future uplink transmission, for example, based on at least in part downlink control information received from a network entity and downlink measurements before the future uplink transmission. A UE can transmit a first uplink (UL) transmission scheduled by the first DCI. The UE can further transmit a second UL transmission after the first UL transmission, a precoding scheme of the second UL transmission being determined based on at least in part the first DCI.

Inter-alia, a method is disclosed comprising: obtaining a time domain and / or doppler domain information, based on measuring time variations of a channel from tracking reference signal, TRS; and reporting the time domain and / or doppler domain information and a channel state information, CSI, wherein the CSI is obtained by measuring on CSI reference signal, CSI-RS. Further, a method is disclosed comprising: receiving time domain and / or doppler domain information and at least one channel state information, CSI; and reconstructing a time domain function based on the time domain and / or doppler domain information and a precoder matrix based on CSI. It is further disclosed according apparatuses, computer programs and systems.

A base station: receives respective CSI feedback (q_1) to (q_K) from user equipments 1 to K; and determines a precoding vector for the user equipment k on the basis of the CSI feedback (q_1) to (q_K), where, k=0, . . . , K. The determining of the precoding vector for the user equipment k on the basis of the CSI feedback (q_1) to (q_K) may comprise determining the precoding vector for the user equipment k through a decoder on the basis of i) a value of the sum of CSI feedback (q_1) to (q_k−1) and (q_k+1) to (q_K) from the remaining user equipments 1 to (k−1) and (k+1) to K except for the user equipment k among the user equipments 1 to K, and ii) CSI feedback (q_k) from the user equipment k.

Apparatuses, methods, and systems are disclosed for determining a precoder for wireless communications. An apparatus is configured to determine a precoder for a set of modulation symbols representing at least two distinct multiplexed streams of information. The precoder includes a plurality of codewords and is configured to reduce an ensemble interference and a pairwise interference for the plurality of codewords. The apparatus is configured to precode the set of modulation symbols based on the precoder and map the precoded set of modulation symbols to a set of resources. The apparatus is configured to generate a non-orthogonal multiplexed channel for access to the resources by overloading the set of modulation symbols at a transmission rate that is greater than a Nyquist rate and transmit an indication of the precoder and the set of resources.

An apparatus includes means for determining to use a set of transmit antenna arrangements for spatial division multiplexing or single frequency network based simultaneous transmission across multiple antenna arrangement physical uplink shared channel transmission; and means for determining to use the set of transmit antenna arrangements for a physical uplink control channel resource transmission, in response to two different transmission configuration indicator states being indicated and the apparatus being configured to apply physical uplink shared channel precoding for simultaneous transmission across multiple antenna arrangement physical uplink shared channel transmission.

The invention discloses an integrated waveform generation method and device based on transmission symbol compensation. The method comprises the following steps: generating an imitated radio frequency division multiplexing pilot signal; the simulated radio frequency division multiplexing pilot signal is sent to a receiving end, the receiving end is used for carrying out channel estimation on the simulated radio frequency division multiplexing pilot signal to obtain channel state information, and the channel state information comprises normalized time delay, normalized Doppler frequency shift or gain; according to the channel state information, pre-compensation processing is carried out on an imitated radio frequency division multiplexing information symbol on a target domain to obtain a compensation signal, and the target domain comprises a discrete affine Fourier transform domain or a time domain; and performing precoding processing on the compensation signal to obtain an integrated waveform. According to the invention, integrated waveform generation is realized, the efficiency is improved, and the signal processing complexity and resource overhead are reduced. The method can be widely applied to the technical field of wireless communication.

The invention relates to an RIS auxiliary enhanced communication method based on an evolutionary guidance strategy gradient in the field of wireless communication, and provides an evolutionary guidance strategy gradient (EGPG) algorithm for joint optimization of transmitting end precoding and an RIS reflection phase shift matrix in an RIS auxiliary communication system. In combination with a strong fitting characteristic of deep learning, a gradient characteristic of reinforcement learning and a strong exploratory property of evolutionary learning, an idea of evolutionary learning is adopted to carry out iterative optimization on intelligent agent actions, so that sample diversity is increased for deep reinforcement learning, and strategy network optimization of deep reinforcement learning is guided. Compared with a traditional optimization algorithm, the method has a simple and clear optimization framework and low calculation complexity, and meanwhile, compared with a gradient-based deep reinforcement learning algorithm and an evolutionary reinforcement learning algorithm, the method has faster convergence and better system performance.

The apparatus may be a wireless device configured to estimate, for a first transmission in a first slot, a first channel associated with the first transmission, wherein the first transmission is associated with a first precoding, receive, in a second slot following the first slot, a second transmission associated with a second precoding, and estimate, based on the received second transmission and at least one of the received first transmission or the estimated first channel, a second channel associated with the second transmission.

The invention discloses a low-complexity MSK coded modulation system phase synchronization receiving system and method, and relates to the technical field of continuous phase modulation. On one hand, an original message is coded and modulated by constructing a pre-coding mode, a receiving end realizes optimal sampling point extraction at the minimum intersymbol crosstalk moment after phase decoupling frequency conversion processing, MSK is converted into BPSK-like modulation, oversampling processing is not needed, modulation phase components of a receiving synchronization section can be offset, and the modulation efficiency of the receiving synchronization section is improved; therefore, accurate estimation of Doppler phase and frequency is realized, and the anti-Doppler capability is improved. On the other hand, coherent demodulation soft information is directly output after the real part of the signal subjected to Doppler frequency offset and phase offset compensation is obtained, the complexity of the demodulation algorithm is low, the performance of the demodulation algorithm is equivalent to that of BPSK, the demodulation algorithm is remarkably superior to that of an MSK optimal demodulation receiver in a low signal-to-noise ratio region, and the demodulation algorithm is particularly suitable for a bit interleaving coding modulation system combined with channel coding and has a wide application prospect. And reliable transmission under a low signal-to-noise ratio can be realized.

Methods, systems, and devices for wireless communications are described. A first wireless device receives or transmits, from a second wireless device, first signaling indicating a size of a precoding resource block group and an offset parameter indicating an offset between the precoding resource block group and a codeblock. The first wireless device transmits or receives second signaling indicating a resource element starting parameter and a resource element ending parameter in at least one of a time domain and a frequency domain based at least in part on the size of the precoding resource block group. The first and second wireless devices communicate coded bit streams that are interleaved in accordance with at least one of the size of the precoding resource block group, the offset parameter, the resource element starting parameter, the resource element ending parameter, or any combination thereof.