69 results about "Mimo transmission" patented technology

A method for determining an uplink multiple input multiple output (MIMO) transmission codeword, includes: determining at least one of a candidate codeword of 4 transmit antenna ports (Tx) for uplink MIMO transmission or a candidate codeword of 2 Tx for uplink MIMO transmission; dividing 8 Tx into K antenna port groups, wherein K is a positive integer less than 8; determining a third codeword from the candidate codeword, and determining a fourth codeword corresponding to the third codeword; and obtaining a first codeword for the antenna partial coherence transmission of 8 Tx L-layer for the uplink MIMO transmission by splicing, based on the antenna port groups and a co-phasing coefficient, the third codeword and the fourth codeword, wherein L is less than or equal to 8.

A transmission method intended for an OMAMRC telecommunication system with M sources (s1, . . . , sM), possibly L relays and one destination, M≥2, L≥0. In such a solution, when a source could not be decoded by the destination, the latter organises a retransmission by taking into account the characteristics of a MIMO transmission channel established between, on the one hand, at least two nodes that decoded the source and, on the other hand, at least two antennas in reception of the destination in the form of a precoding coefficient. Thus, the method therefore makes it possible to improve the decoding performance of a source si, in a context where the destination is equipped with a plurality of antennas in reception.

Systems, methods, apparatuses, and computer program products for enabling efficient cell-free MIMO transmissions. One method may include receiving a downlink reference signal, determining at least one cell-free multiple input multiple output transmission strategy associated with at least one access point based upon at least the downlink reference signal, and transmitting to a network entity at least one of the at least one cell-free multiple input multiple output transmission strategy and enabling information.

A method and system are disclosed for optimizing downlink multi-user multiple-input multiple-output (MU-MIMO) transmission in time division duplex (TDD) wireless communication systems. Sounding reference signals (SRS) from user equipment (UEs) are processed using a machine-learned model to extract physical-layer channel characteristics, including Doppler spread, delay profile, and signal-to-noise ratio (SNR). Based on these features, a channel state information (CSI) acquisition operation is adaptively selected for each UE—either channel estimation (CE) alone or both CE and channel prediction (CP). When CP is used, prior channel estimates are analyzed to generate predicted CSI over a future interval. The obtained CSI is then used to configure MU-MIMO transmission parameters such as beamforming weights, modulation and coding schemes (MCS), and UE grouping. This adaptive framework improves performance in time-varying and high-mobility environments by ensuring timely and reliable CSI is used for downstream transmission decisions.

Techniques and apparatus for radio frequency (RF) exposure compliance for multiple-input, multiple-output (MIMO) transmissions are described. An example method that may be performed by a wireless device includes determining a respective multiple-input, multiple-output (MIMO) transmit power limit for each of a plurality of antennas of the wireless device. A signal associated with a MIMO transmission is transmitted from each antenna at a respective first transmission power level based on the respective MIMO transmit power limit for the antenna in compliance with a radio frequency (RF) exposure limit. The first transmission power level used for a first antenna of the plurality of antennas is different from the first transmission power level used for a second antenna of the plurality of antennas.

An apparatus configured to: receive at least one system information block comprising, at least, an indication of a demodulation reference signal port for monitoring for a random access response message; determine based, at least partially, on the at least one system information block, at least one resource for reception of the random access response message; and monitor for the random access response message using the at least one determined resource and the demodulation reference signal port.

In the communication method, a first device generates a first signal, the first signal comprises M1 elements, M1 is determined based on M2 and a first parameter, M1 is a positive integer greater than M2, and M2 is a positive integer. The first device precodes the first signal to obtain a second signal, wherein the second signal comprises M1 elements. And the first device sending a third signal on a first frequency domain resource, the first frequency domain resource including M2 frequency domain units, the third signal being generated based on M2 elements selected from M1 elements included in the second signal. Visibly, according to the method, the time domain FTN is realized by transmitting the information amount of the M1 elements included in the first signal on the M2 frequency domain units. According to the method, the symbol duration is not changed, when the method is applied to a scene of multi-user frequency division multiplexing or MU-MIMO transmission, the symbol durations adopted by multiple users are the same, the CPs are aligned, and inter-user interference caused by different symbol durations of the multiple users is avoided.

【Solution means】The embodiments of this application disclose a method and apparatus for determining an uplink MIMO transmission codeword applicable to a communication system. The method includes the steps of determining candidate codewords for 4Tx and / or 2Tx of uplink MIMO transmission, where the candidate codewords include at least one of a first candidate codeword for antenna full coherent transmission, a second candidate codeword for antenna partial coherent transmission, and a third candidate codeword for antenna non-coherent transmission, and determining a first codeword for antenna partial coherent transmission and / or a second codeword for non-coherent transmission of 8Tx L layers of the uplink MIMO transmission based on the candidate codewords. In the embodiments of this application, based on low-dimensional transmission codewords, high-dimensional 8Tx antenna partial coherent transmission codewords or non-coherent transmission codewords can be constructed, so that uplink MIMO can support transmission requirements from 1 layer to 8 layers of 8Tx, and the uplink MIMO technology can be further enhanced.

Aspects presented herein may improve multiple-input multiple-output (MIMO) operations by providing a semi-open-loop MIMO scheme with a higher granularity. In one aspect, a network entity formulates, based on wideband (WB) channel state information of a channel from a user equipment (UE), a set of precoding matrices to be applied on a set of resource blocks (RBs) or a set of resource elements (REs) for a data channel transmission on the channel. The network entity precodes the set of RBs or the set of REs for the data channel transmission on the channel with the formulated set of precoding matrices and a set of phase values in a cycling manner. The network entity transmits, via the channel, an indication of the set of precoded RBs or the set of precoded REs.

Techniques and apparatuses are described for multiple-input multiple-output transmissions using adaptive phase-changing devices. In aspects, a base station selects one or more adaptive phase-changing devices, APDs, to use in at least one communication path for multiple-input, multiple-output, MIMO, transmissions. The base station can perform a channel characterization process for the at least one communication path using the at least one APD and at least one UE. Based on results of the channel characterization process, the base station configures the at least one APD by which to implement single user-MIMO communication with a UE or multiple user-MIMO communication with multiple UEs. By so doing, the base station may implement MIMO transmissions using APDs to communicate with the at least one UE using same time and frequency resources, which can improve spectral efficiency of a wireless network.

A communication method and apparatus. In the communication method, a first device generates a first signal, the first signal comprising M1 elements, M1 being determined on the basis of M2 and a first parameter, M1 being a positive integer greater than M2, and M2 being a positive integer. The first device precodes the first signal to obtain a second signal, the second signal comprising M1 elements. The first device sends a third signal on a first frequency domain resource, the first frequency domain resource comprising M2 frequency domain units, and the third signal being generated on the basis of M2 elements selected from among the M1 elements comprised in the second signal. Thus, according to the method, time domain FTN can be achieved by means of transmitting the information amount of the M1 elements comprised in the first signal on the M2 frequency domain units. According to the method, symbol durations are not changed, and when the method is applied to scenarios of multi-user frequency-division multiplexing or MU-MIMO transmission, symbol durations used by multiple users are the same and CPs are aligned, thereby preventing inter-user interference caused by different symbol durations among multiple users.

A communication method and device, applied to the technical field of communications, the method comprising: a first communication device receiving first information from a second communication device, the first information comprising a first field and / or a second field, the first field indicating a DMRS pattern, the second field indicating a DMRS port, an RRC link not being established between the first communication device and the second communication device, and / or the physical shared channel corresponding to the first communication device is scheduled by the DCI 10 or the DCI 0; and the first communication device performs physical shared channel transmission with the second communication device according to the first information. According to the embodiment of the invention, flexible configuration of the DMRS pattern and the DMRS port can be realized under the condition that an RRC link is not established between the terminal equipment and the network equipment, the configuration is not limited to SU-MIMO single-stream transmission, SU-MIMO multi-stream transmission and MU-MIMO transmission can also be supported, and the communication performance of a communication system can be improved.

The invention provides a communication method, and the method comprises the steps that a first communication device obtains an environment reconstruction map of a first space, the first space is a space in a preset range of the first communication device, the environment reconstruction map is expressed through map base elements, and the map base elements comprise parameter information of the map base elements; the parameter information of the map base element comprises type information and position information of the map base element; and the first communication equipment performs communication service according to the environment reconstruction map, wherein the communication service comprises at least one of the following items: MIMO transmission, channel measurement, link adaptation, beam management, high-frequency communication, network management and data transmission. In the application, the first communication device can flexibly use the defined data format to represent the environment reconstruction map for different services, different UE capabilities and the like, and can also perform communication services according to the acquired environment reconstruction map, so that the accuracy of communication related parameters can be improved, and better transmission / scheduling parameters can be acquired.

A first client station receives a multi-user physical layer (PHY) data unit from an access point. The multi-user PHY data unit includes i) a PHY preamble, and ii) an MU-MIMO transmission. The PHY preamble includes respective subfields that indicate respective numbers of spatial streams allocated to respective client stations. The respective subfields have been encoded according to an encoding that supports allocating up to sixteen spatial streams to up to eight intended receivers. The respective subfields are arranged in the PHY preamble according to an order. The first client station determines a position of a particular subfield corresponding to the first client station within the order, and uses the position of the particular subfield to decodes the particular subfield to determine a number of spatial streams allocated to the first client station. The first client station processes the determined number of spatial streams in the MU-MIMO transmission.

A method, a terminal device and a network device for wireless communication, the method comprising: calibrating, by the terminal device, correlations between multiple transmission paths of the terminal device in a first calibration window; and performing, by the terminal device, data transmission based on the calibrated correlations between the multiple transmission paths. By calibrating the correlations between the multiple transmission paths of the terminal device based on the calibration window, the correlations between the multiple transmission paths are improved, and further, related MIMO transmission can be performed between the multiple transmission paths with the correlations, which is beneficial to improving the uplink transmission performance of the terminal device.

A method is disclosed for reduction of peak-to-average power ratio (PAPR) of transmission of a multiple-input multiple-output (MIMO) signal from a transmitter, wherein the transmission comprises a number of MIMO layers. The method comprises determining a clipping signal for the MIMO signal, and generating a PAPR reduced MIMO signal for transmission by combining the MIMO signal with a projection of the clipping signal onto a null space of an effective channel. The effective channel comprises a propagation channel between the transmitter and one or more receivers (wherein the receivers have an amount of receiver antenna ports) as affected by receiver combining matching transmitter precoding. A setting of the transmitter precoding is varied over frequency, which induces frequency selectivity of the effective channel. The method is particularly useful when the propagation channel is relatively flat in frequency. Corresponding computer program product, apparatus, radio access node, user device, control node, and system are also disclosed.

A transmitter (110) is disclosed for communicating for MIMO transmissions to a plurality of receivers (140) using a final sequence vector based on a target signal vector s. The transmitter (110) is configured to generate one or more sequence vectors from a precoding matrix W and the target signal vector s, and execute an iterative vector perturbation (VP) scheme (200, 300, 400, 500) to determine the final sequence vector by iteratively optimizing the one or more sequence vectors. The iterative VP scheme (200, 300, 400, 500) is configured to: (a) generate a plurality of candidate perturbation vectors from the precoding matrix W and the one or more sequence vectors of a previous iteration; (b) determining, for each of the candidate perturbation vectors, one or more sequence correlation values between the respective candidate perturbation vector and the one or more sequence vectors of the previous iteration; (c) selecting one or more perturbation vectors from the plurality of candidate perturbation vectors according to the plurality of sequence correlation values to obtain one or more selected perturbation vectors; and (d) optimizing the one or more sequence vectors according to the one or more selected perturbation vectors to determine the final sequence vector.

The present disclosure provides a terminal MIMO transmission layer number adjustment method and device, and relates to the technical field of communication, which comprises the following steps: receiving antenna switching configuration switching report information sent by a terminal device; and reconfiguring the maximum MIMO transmission layer number supported by the terminal device according to the switching report information. Thus, the network device can perform different scheduling according to different types of antenna switching configuration of the terminal, adjust the maximum MIMO transmission layer number configured to the terminal device, and match the maximum MIMO transmission layer number configured by the network with the antenna switching requirement of the terminal, thereby improving the reliability of CSI estimation, saving system resources, and helping the terminal save power.

The present application provides a communication method and a communication apparatus. The method may comprise: receiving configuration information of N sensing systems of a second communication device; determining M sensing systems among the N sensing systems on the basis of the configuration information of the N sensing systems, communication quality parameters of the M sensing systems satisfying a first condition; and sending information about the M sensing systems. By means of the method, when the second communication device cannot acquire in a timely manner channel information or weight vector information fed back by a first communication device, precoding calculation can be performed by means of information of a sensing system, and a precoding effect is determined by means of the feedback of the first communication device, thereby achieving flexible and efficient MIMO transmission.

The present disclosure relates to a communication method and system, and a device and a storage medium. The method can be executed by a terminal, and comprises: determining first information, wherein the first information comprises at least one of the following: a power scaling factor corresponding to each spatial-domain basis vector, the spatial-domain basis vector being used for beamforming in multiple-input multiple-output (MIMO) transmission; and a power scaling factor corresponding to each transmission layer, each transmission layer corresponding to a data stream in the MIMO transmission. The transmission power corresponding to each data stream can be effectively allocated, thereby effectively ensuring the reliability of data transmission.

The invention provides an interference communication integrated signal design method based on MIMO-OCDM (Multiple Input Multiple Output-Optical Code Division Multiplexing). The implementation steps are as follows: constructing an application scene of an interference communication integrated signal and a binary communication data matrix; performing OCDM on the binary communication data matrix, and obtaining an MIMO-OCDM communication signal and a frequency shift interference signal; and finally, an MIMO-OCDM interference communication integrated signal is obtained. According to the method, Hadamard matrix coding is carried out on the time domain signal matrix obtained after discrete Fresnel inverse transformation is carried out on the frequency domain QPSK symbol matrix so as to obtain the MIMO-OCDM communication signal matrix, it is guaranteed that multiple time domain signals have the high anti-interference capacity, interference of signals between MIMO transmitting channels is reduced, and the communication performance of the MIMO-OCDM communication signal matrix is improved. Moreover, a non-partner needs to obtain the interference communication integrated signals transmitted by all MIMO transmission channels and correctly analyze and recombine the interference communication integrated signals to obtain the communication data, thereby improving the anti-interference difficulty of the radar of the opposite side.

This application discloses a file annotation method, apparatus, device, and medium based on PDFJS and MIMO, relating to the field of computer technology. The method includes: rendering the original PDF file onto a first canvas layer using the PDF.js library and creating a second canvas layer; monitoring client annotation operations on the second canvas layer to generate corresponding annotation operation data packets, and uploading these data packets to a preset server via a preset network channel based on a preset MIMO transmission strategy, so that the preset server associates and stores the annotation data packets with the unique identifier of the original PDF file; if a loading request for the original PDF file is received, the annotation description file is obtained using the unique identifier, and the annotation data within it is drawn onto the second canvas layer to reconstruct the annotations. This enables precise mapping of annotation coordinates, improves the efficiency of multi-channel real-time collaboration, and enhances the storage and management capabilities of annotation data in a Web environment.

The invention discloses a hierarchical collaborative resource optimization method of an MEC-assisted VR video stream XL-MIMO transmission system. According to the method, the interference between the users is managed by optimizing the link selection between the users and the BS subarrays, and the transmission capability of the system is improved. Meanwhile, the invention also relates to optimization of block QP selection, calculation unloading decision, beam forming vector and calculation resource allocation, and aims to minimize weighted energy consumption under the constraint of meeting the requirements of time delay and field-of-view distortion. In order to improve the optimization efficiency of a high-dimensional mixed integer nonlinear programming problem, the invention provides a hierarchical collaborative optimization joint calculation unloading and resource allocation module, and an upper layer solves QP selection, beam forming design and calculation resource allocation by using a traditional convex optimization method. And the lower layer optimizes link selection and computes an unloading decision based on a decision-based dual-depth Q network and imitation learning. The method can overcome the defects that a traditional optimization method is long in calculation time consumption and prone to falling into local optimum, so that the resource allocation efficiency is remarkably improved, and the system environment change is quickly responded.

The application provides a signal transmission method and related devices. The signal transmission method comprises: a terminal device receiving a first received signal; the first received signal is transmitted to the terminal device through a corresponding downlink channel of the terminal device after a first reference signal is precoded according to a first channel matrix; the first channel matrix is obtained according to a second channel matrix; the number of rows and / or columns of the first channel matrix is less than or equal to the sum of the number of receiving antennas of one or more terminal devices participating in MIMO transmission; and the second channel matrix is a channel matrix of the corresponding downlink channel of the one or more terminal devices. The terminal device obtains an equivalent channel coefficient corresponding to the terminal device according to the first received signal.

A method of determining a lower bound on users' speed for efficient SRS resource handling for MU-MIMO transmission includes determining an eNodeB (eNB) or gNodeB (gNB) timing of a subframe; determining a User Equipment (UE) timing of the subframe; calculating a timing advance type corresponding to a Round Trip Time (RTT); calculating a distance to a base station corresponding to the Round Trip Time (RTT); calculating a distance traveled by a UE between two points based on the distance to the base station; calculating a user speed based on the distance traveled by the UE; deriving a lower bound based on the user speed; and filtering users that exceed the lower bound on user speed. The filtered users may be not assigned SRS. The non-filtered users may be assigned SRS and may subsequently be sent MU-MIMO transmissions.

Systems and methods described provide a multiple-input multiple-output (MIMO) optimization service. A network device in a RAN predicts high usage thresholds and available per-service resources for supporting MIMO transmissions. The network device identifies, based on the predicted usage thresholds, user equipment (UE) devices that have a high-throughput session and have high usage levels on a cell. The network device assigns, based on the predicted available per-service resources, sounding reference signal (SRS)-based MIMO resources to the UE devices in the cell and assigns codebook-based MIMO resources to other UE devices in the cell.

Embodiments of the present application disclose a method and device for determining a full-coherent transmission codebook of 8 antenna ports of uplink MIMO transmission, which can be applied to a communication system. The method comprises: determining a first candidate codeword and a second candidate codeword from a full-coherent transmission candidate codebook of 4 antenna ports of uplink MIMO transmission; determining a constraint condition that a common phase coefficient needs to satisfy based on orthogonality of candidate codewords in the candidate codebook, and determining the common phase coefficient based on the constraint condition; and splicing the first candidate codeword and the second candidate codeword according to the common phase coefficient to determine a full-coherent transmission codeword of L layers of 8 antenna ports of uplink MIMO transmission. In the technical solution, a high-dimension full-coherent transmission codeword of 8 antenna ports can be constructed based on a low-dimension full-coherent transmission codeword, which can enable uplink MIMO to support transmission requirements of 1 layer to 8 layers of 8 antenna ports, and further enhance uplink MIMO technology.

The embodiments of the present application relate to the field of wireless communications. Provided are a data transmission method and an apparatus. The method comprises: a data channel of a first communication standard performs a MU-MIMO transmission with a data channel of a second communication standard; and a network device indicates configuration information of a DMRS of the second communication standard to a terminal of the first communication standard, so that the performance of receiving the DMRS of the first communication standard can be improved on the basis of the configuration information, and the performance of receiving the data channel of the first communication standard is further improved.

The invention belongs to the technical field of information and communication, and discloses an MIMO transmission method based on double-layer intelligent metasurface assistance. Double-layer intelligent metasurfaces are arranged on a sender and a receiver, so that an integral cascade channel can present unit matrix characteristics, and direct end-to-end multi-data stream transmission is realized. According to the method, an actual channel model and an expected unit channel matrix model are constructed, and the actual channel model fits the unit channel matrix by optimizing the phase shift and the sending power of the double-layer intelligent metasurface. Compared with a traditional multi-layer stacked intelligent metasurface, the multi-layer stacked intelligent metasurface can reduce power loss so as to obtain more excellent bit error rate performance.

A method for communicating with at least one Wi-Fi receiving station (120; 110), comprising a communication interface (113; 123), a communication interface (113; 123) further comprises one or more power amplifiers (113a; 123a) and a plurality of antennas (113b; 123b), a plurality of antennas (113b; 123b) for multiple input multiple output (MIMO) transmission to the at least one Wi-Fi receiving station using a power fallback of a maximum transmission power of the Wi-Fi transmitting station, where the communication interface is further configured to send an indication to the at least one Wi-Fi receiving station for adjusting a power fallback correction value of the maximum transmission power, and / or receiving, from at least one Wi-Fi receiving station, an indication of a power fallback correction value for adjusting the maximum transmission power, i.e., information about the power fallback correction value. Furthermore, the Wi-Fi transmitting station comprises processing circuitry for determining, i.e., setting, a transmission power for MIMO transmissions to the at least one Wi-Fi receiving station based on the maximum transmission power and the power fallback value minus the power fallback correction value.