21 results about "Cooperative beamforming" patented technology

The invention relates to a semantic perception multi-unmanned aerial vehicle CoMP joint space deployment and resource optimization method, which belongs to the technical field of semantic communication and unmanned aerial vehicle cooperative communication, and comprises the following steps: S1, establishing a system model integrating a multi-unmanned aerial vehicle cooperative communication CoMP physical layer and a task-oriented semantic communication layer; s2, an optimization problem mathematical model combining unmanned aerial vehicle space deployment, cooperative beam forming and semantic compression ratio SCR selection is established; s3, converting a mixed integer nonlinear programming MINLP problem into a sub-problem suitable for solving; and S4, designing a hybrid alternating learning optimization HALO algorithm, and obtaining effective solutions for optimizing variable unmanned aerial vehicle deployment, cooperative beam forming and semantic compression ratio selection.

This invention relates to the field of communication technology, specifically to a method and apparatus for the joint design of a virtual antenna array and beamforming for unmanned aerial vehicles (UAVs). The method includes: constructing a near-field signal transmission model based on the positions of each UAV, the distance between the communication user and the sensing target; determining an integrated sensing beamforming model based on the virtual antenna array; determining the downlink signal transmission model for the communication user and the sensing signal echo model based on the near-field signal transmission model; determining the Fisher information matrix and Cramer-Rhodes bound of the sensing target; constructing an objective function with the goal of minimizing the Cramer-Rhodes bound; and solving the objective function using an inner loop algorithm and an outer loop algorithm to determine the positions of each UAV and the beamforming matrix. This invention combines the coordinated position adjustment of multiple UAVs with cooperative beamforming to improve the communication quality for the communication user and the sensing performance for the sensing target, thereby fully utilizing the flexible deployment characteristics of UAVs.

The invention discloses a predictive cooperative beam forming and resource allocation method based on multi-station information fusion, which is suitable for a cellular-free large-scale MIMO unmanned aerial vehicle communication system. According to the method, a low-overhead beam tracking frame structure is designed on a ground base station side, and position tracking of a mobile unmanned aerial vehicle user is realized by using an uplink pilot signal and based on an extended Kalman filtering distribution mode; and then, designing beam forming based on position prediction to realize downlink data transmission. Each base station returns user state estimation and covariance information in a low-overhead mode through a forward link, and the central processing unit fuses information of multiple base stations to improve position tracking precision. Furthermore, according to the method, the system effectiveness and the spectrum efficiency are taken as optimization targets, the uplink pilot frequency length, the downlink base station user association and the power distribution are jointly optimized, and a low-complexity iterative algorithm based on compressed sensing and fractional programming is used for solving. According to the invention, the pilot frequency training and backhaul overhead can be obviously reduced.

Embodiments of the present disclosure provide a beamforming method and apparatus, and a storage medium. The method comprises: measuring first measurement signals and second measurement signals, and determining measurement results; on the basis of the measurement results, determining serving transmitting / receiving points, coding matrix coefficients of the serving transmitting / receiving points, and / or beamforming coefficients of a network device; and sending the coding matrix coefficients of the serving transmitting / receiving points and / or the beamforming coefficients of the network device to the network device, wherein the first measurement signals comprise measurement signals sent by the network device by means of transmitting / receiving points, and the second measurement signals are measurement signals sent by the transmitting / receiving points. According to the present disclosure, the second measurement signals sent to a terminal by the transmitting / receiving points are increased, so that the terminal can distinguish the measurement signals, and the terminal can voluntarily select the serving transmitting / receiving points on the basis of the measurement results and report related information of cooperative beamforming to a network side, thereby improving the beamforming performance of a system, and reducing the measurement overhead.

The invention relates to the technical field of wireless communication, in particular to a low-orbit multi-satellite distributed cooperative beam forming method and system based on high-orbit and low-orbit inter-satellite interference avoidance. The method comprises the following steps: establishing a high-orbit and low-orbit heterogeneous multi-satellite multi-beam cooperative transmission system; establishing an equivalent signal to interference plus noise ratio expression and a rate evaluation expression of the low-orbit user; constructing a beam forming optimization model, establishing a spectrum efficiency maximization model under a multi-satellite transmitting power constraint and a high-orbit and low-orbit inter-satellite interference avoidance constraint, and equivalently converting the spectrum efficiency maximization model into an independent sub-problem superposition form related to a pre-coding vector; solving a global variable, defining a feedback variable of each low earth orbit satellite, and representing an iterative update formula of the global variable as a function of the feedback variable; and solving a local precoding vector according to the global variable and the local channel state information, and repeating iteration until the problem converges. According to the method, parallel distributed calculation of low-orbit multi-satellite cooperative beam forming is realized, and interference to high-orbit users is avoided while spectrum efficiency is optimized.

Provided is a base station including a distributed unit and a plurality of radio units, wherein each of the plurality of radio units includes: a reception unit that receives, from the distributed unit, configuration information related to cooperative beamforming control; a control unit that, on the basis of the configuration information, enables a synchronization window for synchronizing data transmission timings among the plurality of radio units; and a transmission unit that uses the synchronization window to transmit data to a terminal.

A PPDU transmission / reception method and device for coordinated beamforming in a wireless LAN system are disclosed. The method performed by a first AP in a wireless LAN system, according to one aspect of the present disclosure, may comprise the steps of: transmitting a first frame to a second AP, the first frame including information about the GI duration and UHR-LTF size for Co-BF transmission; and transmitting a first PPDU for the Co-BF transmission to one or more first STAs associated with the first AP.

Certain aspects of the present disclosure provides a method for wireless communication utilizing coordinated beamforming (CoBF). According to certain aspects, an apparatus (e.g., a non-AP STA) obtain a joint packet output simultaneously from a first wireless node and a second wireless node, wherein the first wireless node is associated with a first basic service set (BSS) and the apparatus and second wireless node are associated with a second BSS and the joint packet has a training field with one or more first spatial streams from the first wireless node and one or more second spatial streams from the second wireless node; generates channel feedback, based on the first spatial streams, for a first channel between the first wireless node and the apparatus; and provides the channel feedback to at least one of the first wireless node or the second wireless node.

The invention discloses a federated learning security optimization method based on cooperative beam forming and node selection in a multi-unmanned aerial vehicle network, and aims to solve the problem that security, system cost and accuracy cannot be collaboratively optimized in the prior art. The method comprises the following steps: S1, establishing a multi-unmanned aerial vehicle federated learning system containing dynamic role division and a channel model; s2, carrying out quantitative modeling on the comprehensive cost, the communication security and the model accuracy of the system; s3, constructing a joint optimization objective function taking the transmitting power, the training round number and the interference parameters as variables, and establishing a Markov decision process; s4, designing a deep reinforcement learning algorithm based on SAC to solve the problem; and S5, integrating a graph attention mechanism and a multi-head attention mechanism in the solving network so as to process a dynamic topology and hybrid action space. According to the method, by establishing a unified optimization framework, multi-index collaborative optimization is realized, and the system cost is effectively reduced while the safety and the accuracy are improved.

A sounding method for coordinated beamforming in a multi-AP wireless network is provided. The method is implemented by a first wireless access point (AP) of a first basic service set (BSS), and includes transmitting a sounding packet to a second wireless station (STA) of a second BSS, wherein the sounding packet comprises a field indicating that a transmitter address is an address of a second wireless AP associated with a second BSS. The method includes receiving a feedback report from the second wireless STA of the second BSS, wherein the feedback report comprises interference channel of the second wireless STA.

Embodiments of the present disclosure provide a beamforming method and apparatus, and a storage medium. The method comprises: measuring first measurement signals and second measurement signals, and determining measurement results; on the basis of the measurement results, determining serving transmitting / receiving points, coding matrix coefficients of the serving transmitting / receiving points, and / or beamforming coefficients of a network device; and transmitting the coding matrix coefficients of the serving transmitting / receiving points and / or the beamforming coefficients of the network device to the network device, wherein the first measurement signals comprise measurement signals transmitted from the network device by means of transmitting / receiving points, and the second measurement signals are measurement signals transmitted from the transmitting / receiving points. According to the present disclosure, the second measurement signals transmitted to a terminal by the transmitting / receiving points are increased, so that the terminal may distinguish the measurement signals, and the terminal may voluntarily select the serving transmitting / receiving points on the basis of the measurement results and report related information of cooperative beamforming to a network side, thereby improving the beamforming performance of a system, and reducing the measurement overhead.

The present application belongs to the field of wireless communications. Disclosed are a communication method and apparatus for a Co-BF sounding process, a device, and a medium. The method is executed by a first access point device, and the method comprises: receiving a first frame sent by a second access point device, wherein the first frame is used for indicating a first state; the first state is a state in which the second access point device receives a compressed beamforming / channel quality indication report within one or more coordinated beamforming sounding sequences; the first access point device is an initiating access point device within the one or more coordinated beamforming sounding sequences; and the second access point device is a responding access point device within the one or more coordinated beamforming sounding sequences.

The application provides a non-orthogonal active-passive cooperative beamforming design method based on beneficial interference, and belongs to the field of energy efficiency optimization of downlink wireless communication. In a conventional IRS-NOMA network, two potential inter-user interferences affect the performance of the system. On one hand, SIC cannot eliminate the interference from high-decoding-order users, and these signals are regarded as noise by the receiving users; on the other hand, when SIC eliminates the interference from low-decoding-order users, the interference signals are difficult to be completely detected and eliminated, and thus the residual interference affects the system performance. Based on this, the application provides two CI-assisted interference design schemes. Specifically, for scheme I, CI converts the interference from high-decoding-order users into user useful receiving information to utilize the interference that cannot be eliminated by the user receiving end. For scheme II, CI converts the interference from low-decoding-order users into user useful receiving information to eliminate the SIC process and improve the useful signal power of the user end.

A method for multi-beamformer sounding is described. A method may include transmitting a multi-beamformer (MB) null data packet (NDP) advertisement (NDPA) frame by a first access point (AP) as a requesting beamformer, requesting a second AP as a cooperating beamformer to transmit a second AP NDP; the first AP transmits a first AP NDP; the first AP receives a channel state information (CSI) report from a first station (STA) associated with the first AP, wherein the CSI report includes information about the first AP NDP and information about the second AP NDP.

The invention provides a frequency alignment method, which relates to the technical field of wireless communication, is executed by a second communication device, and comprises the following steps: receiving N first signal frames from a first communication device; determining a frequency pre-correction value according to the N first signal frames, wherein the frequency pre-correction value is used for aligning the frequency with the first communication equipment; and sending a second signal frame which needs to be aligned with the first communication equipment in frequency based on the frequency pre-correction value. The first signal frame may include signal frames of different stages, including but not limited to null packet announcement frames, non-null packet announcement frames, Co-BF trigger frames, non-Co-BF trigger frames, Co-SR trigger frames, non-Co-SR trigger frames, etc. According to the invention, multiple estimation and comprehensive processing are carried out by using multiple signal frames, the problem that single estimation is easily influenced by interference is effectively overcome, and the precision and robustness of frequency alignment are remarkably improved, so that the performance of multi-access-point cooperative beam forming, multi-access-point cooperative spatial multiplexing and STA uplink transmission scenes is ensured.

This invention relates to the field of wireless communication technology, specifically to a method and system for cooperative precoding of uplink and downlink in full-duplex multi-user communication. The method includes: establishing a full-duplex multi-user MIMO communication system; constructing uplink and downlink signal models for the communication system; constructing a cooperative precoding uplink and downlink cooperative beamforming optimization model, and establishing a model for maximizing total spectral efficiency under uplink and downlink transmit power constraints; based on the weighted minimum mean square error criterion, introducing auxiliary variables to transform the total spectral efficiency maximization model into an equivalent outer-layer iterative total spectral efficiency maximization problem, and iteratively solving it; establishing an alternating iterative framework for uplink and downlink beamforming matrices, and solving to obtain the uplink and downlink beam matrices. This invention improves the total spectral efficiency of multi-user communication systems in full-duplex communication mode.

Certain aspects of the present disclosure provides a method for wireless communication utilizing coordinated beamforming (CoBF). According to certain aspects, an apparatus (e.g., a non-AP STA) obtain a joint packet output simultaneously from a first wireless node and a second wireless node, wherein the first wireless node is associated with a first basic service set (BSS) and the apparatus and second wireless node are associated with a second BSS and the joint packet has a training field with one or more first spatial streams from the first wireless node and one or more second spatial streams from the second wireless node; generates channel feedback, based on the first spatial streams, for a first channel between the first wireless node and the apparatus; and provides the channel feedback to at least one of the first wireless node or the second wireless node.

This disclosure provides methods, devices, and systems for a unified frame transmission sequence for coordinated beamforming and coordinated spatial reuse. Some aspects more specifically relate to a first access point (AP) that transmits an invite frame within a shared transmission opportunity of the first AP. The invite frame may indicate initiation of a frame transmission sequence associated with a coordinated AP scheme of a plurality of coordinated AP schemes. The first AP and the second AP may communicate one or more frames within the shared transmission opportunity in accordance with the frame transmission sequence. The one or more frames may include information that coordinates downlink physical layer protocol data unit (PPDU) transmissions between the first AP and one or more second APs. In response to communicating the one or more frames, the first AP, a second AP, or both may transmit a coordinated downlink PPDU transmission.

The present application belongs to the field of wireless communications, and discloses a communication method, apparatus, and device, a medium, and a program product. The method is executed by a first station. The method comprises: sending a first frame, the first frame indicating coordinated beamforming sounding.

Disclosed are a method and device for transmitting and receiving a PPDU for cooperative beamforming in a wireless LAN system. A method performed by a first AP in a wireless LAN system, according to one aspect of the present disclosure, may comprise the steps of: transmitting, to a second AP, a first frame including information on the number of UHR-LTF symbols for Co-BF transmission; and transmitting a first PPDU for Co-BF transmission to one or more first STAs associated with the first AP.

A method and a device for coordinated beamforming sounding in a wireless LAN system are disclosed. The method according to one embodiment of the present disclosure may comprise steps in which an STA: transmits a first frame to a first AP; and receives, from the first AP, a second frame in response to the first frame. The first frame and / or the second frame can include information about a capability related to Co-BF sounding.