190 results about "Spatial multiplexing" patented technology

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive control signaling indicating multiple transmission-reception points (TRPs), and may perform measurements for reference signals received from the multiple TRPs within a set of measurement resources. The UE may transmit a channel state information (CSI) report including a first CSI part and a second CSI part, where at least one of the first CSI part or the second CSI part indicates a first mapping between a first set of TRPs and a first set of spatial multiplexing layers, and a second mapping between a second set of TRPs and a second set of spatial multiplexing layers. The UE may then receive a phase-coherent joint transmission of a downlink message from the first set of TRPs in accordance with the first mapping, or from the second set of TRPs in accordance with the second mapping.

A method is disclosed of a transmitter configured to transmit more than one spatially multiplexed streams having a multi-user physical layer packet for a plurality of users. The plurality of users includes a first type user and a second type user. A first stream is assigned for the first type user and a second stream is assigned for the second type user. The method includes leaving a data field of the physical layer packet empty for the first type user, providing second type user emission strength (in a spatial direction towards the first type user) that falls below a threshold value by controlling a spatial emission pattern associated with the second type user for the physical layer packet, and transmitting the physical layer packet.

This disclosure provides methods, components, devices and systems for using a unified framework for coordinated transmission modes, such as a coordinated beamforming (CBF) mode, a coordinated spatial reuse (CSR) transmission mode, and a dedicated transmission opportunity (TXOP) transmission mode. Some aspects more specifically relate to a sharing and shared access point (AP) exchanging communications that facilitate the utilization of a transmission mode. In some implementations, a first AP may transmit, to a second AP, a trigger message that includes an indication of a first station (STA) to be scheduled during a TXOP. The second AP may respond with an indication of whether the second AP can attenuate a transmit signal to the first STA to facilitate the CBF mode. The first STA may proceed with communications via the CBF mode, CSR mode, or dedicated mode in accordance with whether the second AP can attenuate the signal, among other considerations.

Provided are a spatial reuse method and apparatus. The method includes: receiving a radio frame and determining whether the radio frame carries a trigger frame configured to trigger uplink multi-user transmission according to indication information of the trigger frame in a physical signaling field of the radio frame; when the trigger frame is determined to be carried in the radio frame, receiving, by a station, the trigger frame, and acquiring first spatial reuse information of the trigger frame; at an end of a radio frame reception process, determining whether to perform first spatial reuse according to the first spatial reuse information. The present disclosure solves the problem in the related art of low spatial reuse efficiency when a station performs spatial reuse on a radio frame and achieves a technical effect of improving network performance.

An apparatus implemented in a master access point (AP) selects at least one basic service set (BSS) from one or more neighbor BSSs to form a spatial reuse group (SRG). The apparatus then performs coordinated spatial reuse (CSR) in the SRG with a set of overlapping basic service set (OBSS) power detection (PD) parameters.

The invention relates to a silicon nitride-based vertical coupling multilayer waveguide structure, which is constructed on a silicon substrate and comprises at least two groups of silicon nitride buried waveguide layers, each group of buried waveguide layers consists of a silicon oxide lower cladding, a silicon nitride waveguide and a silicon oxide upper cladding, and the silicon oxide upper cladding is used as the lower cladding of the next group of buried silicon nitride waveguide; and longitudinal spatial multiplexing is realized.

The invention belongs to the technical field of micro-nano optics. The invention provides a multi-focus off-axis super lens of a visible light wave band. The multi-focus off-axis super lens comprises a plurality of groups of off-axis single-focus sub super lens assemblies which are circularly arranged, wherein each group of off-axis single-focus sub super lens assemblies comprises a plurality of off-axis single-focus sub super lenses which are concentrically and annularly distributed; wherein the off-axis single-focus sub-super-lens comprises a micro-structure unit and a substrate unit, the micro-structure unit comprises a plurality of micro-structure columns which are uniformly arranged, and one end of each micro-structure column is arranged on the substrate unit. According to the embodiment of the invention, on the basis of a geometric phase modulation principle, through reasonable phase design and microstructure arrangement, the off-axis single-focus sub-super-lens has a designed focus position; through spatial multiplexing of the micro-structures of the multiple off-axis single-focus sub-super-lenses, one super-lens has the phase characteristics of the multiple off-axis single-focus sub-super-lenses, and the functions of the multiple off-axis single-focus sub-super-lenses are achieved on one super-lens.

The invention relates to a two-dimensional spatial multiplexing multi-path synthesis power amplifier circuit, which comprises an input power division network for distributing signals to each path of two-dimensional spatial multiplexing module for signal amplification; the two-dimensional space multiplexing module is used for placing the adjacent multi-path amplifying units or transmitting units in the same area, so that m * N paths of amplifying units or transmitting units are realized in N paths of areas, power synthesis miniaturization is realized, and signals are sent to an output synthesis network; and the output synthesis network is connected with the outputs of the two-dimensional spatial multiplexing modules, and outputs the output signals after power synthesis. Compared with a conventional power synthesis technical scheme, the area is more compact, the output power can be doubled under the same area, or the area is saved by 50% under the same output power, the on-chip power synthesis implementation cost can be greatly reduced, the design is simpler and more convenient through mutual decoupling of parameters of the embedded transformer and the peripheral transformer, and the power synthesis efficiency is improved. The design efficiency is improved.

This invention discloses a method and system for monitoring abnormal data in power grid dispatching. The method includes: embedding multidimensional perturbation codes containing first-type (time-domain delay) and second-type (frequency-domain oscillation) features into dispatching commands; target devices generating physical ripples with specific time-domain fingerprint features in response to dispatching commands, and dynamically selecting a set of responding devices based on node impedance matrices and sensitivity coefficients; target devices and the set of responding devices collaboratively triggering responses with specific frequency-domain fingerprint features, and achieving spatial multiplexing verification through a time synchronization protocol; extracting time / frequency-domain fingerprint features from feedback data, and performing spatiotemporal consistency verification using a dynamic transfer function model and multivariate mutual information entropy. Furthermore, by periodically injecting false interference data, the survival verification of the monitoring system status is achieved. This invention can effectively monitor system failures and identify covert data injection attacks, significantly improving the security defense capabilities of power grid dispatching.

The utility model provides a kind of ship exhaust gas denitration desulfurization sound attenuation white integration device, the device includes the smoke inlet, SCR reactor, primary expansion cavity, secondary expansion cavity, steam heat exchanger and smoke outlet that are sequentially communicated, first spray layer is arranged in the primary expansion cavity, second spray layer is arranged in the secondary expansion cavity, to realize the efficient cooperation and space multiplexing of each function section. Through modularization nesting design and structure function multiplexing, the problems of large space occupation, low efficiency, high energy consumption and inconvenient maintenance existing in the prior art are solved, and through structure design, desulfurization and noise reduction functions are simultaneously realized.

The invention discloses a transmission access method of a directional ad hoc network, relates to the field of wireless ad hoc networks, and is used for improving the total network throughput of the directional ad hoc network. The method comprises the following steps: planning multi-time-slot network operation parameters including time slot parameters, frequency parameters and spatial multiplexing parameters; s2, respectively loading the network operation parameters to each communication node; s3, starting each communication node to construct a time-synchronized self-organizing network, and regularly exchanging spatial position information among the communication nodes; and S4, under the management of a unified time slot timer, each communication node performs transmission access in time slots one by one according to the loaded network operation parameters. According to the invention, the network transmission efficiency of the directional ad hoc network can be improved, and the transmission delay is reduced.

This invention relates to a method for fabricating a low insertion loss spatial multiplexer / demultiplexer for multi-core optical fibers, belonging to the field of multi-core optical fiber communication technology. By using single-core fibers of different core diameters at the splice points, this invention effectively improves the fault tolerance of the multiplexer's core arrangement while reducing optical signal leakage at the splice points, thereby reducing insertion loss. This allows for the multiplexing of signals from single-core fibers into multi-core fibers at the input end and the demultiplexing of signals from multi-core fibers into single-core fibers at the output end. The spatial multiplexing / demultiplexer device prepared using this method exhibits lower insertion loss compared to the traditional bundled method, and is simpler and less expensive to operate than polymer waveguide and fused taper methods. The prepared spatial multiplexer / demultiplexer is small, flexible, durable, and suitable for mass production.

The application discloses a kind of space multiplexing time slot allocation method and system based on underwater acoustic channel conflict matrix, first according to underwater acoustic transmission link model, the link signal receiving success probability in underwater acoustic network is calculated;Second, according to underwater network topology information and link signal receiving success probability, generate channel conflict matrix;Then, construct time slot allocation matrix is used to mark node occupies time slot situation, from time slot conflict situation, time slot occupancy and allocation uniformity angle, to time slot allocation construct multi-objective optimization function;Finally, according to underwater acoustic channel conflict matrix and time slot allocation matrix, through global search, find the optimal solution of time slot allocation.The application comprehensively considers the allocation of underwater channel resources from three aspects of time slot conflict, time slot utilization and time slot allocation uniformity, establishes an effective fitness evaluation mechanism, can make full use of channel resources, and improves underwater acoustic communication performance.

A first STA of a BSS detects an OBSS TXOP on its primary channel. The OBSS transmission meets the criteria for Spatial Reuse operations. The first STA transmits a NPCA switching frame to other STAs of the BSS, on its primary channel using the spatial reuse operation and a reduced transmit power. The frame indicates OBSS interference to those other STAs that are too far to detect it. The NPCA switching frame triggers a switching of channel access from PCA to NPCA at these other STAs. Next, the STAs perform NPCA operations on a NPCA primary channel, even if some of them have not directly detected the OBSS interference. An AP receiving the NPCA switching frame may, in response, transmit a similar switching frame to propagate the OBSS interference information and the switching trigger to yet other STAs too far from the first STA to receive the NPCA switching frame.

This optical amplifier comprises: a rare-earth-doped optical fiber; an excitation light coupler that inputs signal light and excitation light to the rare-earth-doped optical fiber; a multimode excitation light source that outputs the excitation light to a multimode fiber; and a spatial multiplexing optical fiber that is connected to the multimode fiber, that introduces the excitation light into the excitation light coupler, and that has two or more spatial channels.

The invention relates to a three-dimensional optical control method based on a metasurface, and the method comprises the steps: scanning a nano-column unit structure to construct a phase library, selecting high-efficiency half-wave plate nano-columns with phase coverage from-pi to pi from the phase library for the construction of the metasurface, cooperatively introducing a geometric phase and transmission phase regulation and control mechanism, and combining spatial multiplexing arrangement to construct a metasurface. Independent regulation and control of different circular polarization light fields under different wavelengths are realized, so that four switchable optical control focuses are generated in a three-dimensional space; by switching the polarization state or the working wavelength of the incident light, stable capture and controllable transfer of the particles are realized in the space. Compared with the prior art, the method has the advantages that three-dimensional optical control over particles is achieved in an on-chip structure, the control freedom degree is high, and the control adjusting mode is simple and efficient.

Various examples are provided related to adaptive oscillator physical reservoir computers. In one example, a physical reservoir computer (PRC) comprises an adaptive oscillator (AO) including a dynamic plastic state adaptable to a corresponding input function. The PRC can utilize the dynamic plastic state to perform reconfigurable tasks. The AO can include multiple dynamic plastic states each adaptable to a corresponding input function. For example, the dynamic plastic state can correspond to a frequency state, an amplitude state, or a phase state of an input. The AO-based PRC can operate without time or spatial multiplexing. Thus, the AO PRC can function as an analog signal processor of the external signal, compute reprogrammable machine learning tasks, or function as a morphable logic gate.

The invention discloses an air interface scheduling method based on combination of time slot allocation and power control, and relates to the technical field of communication. Controlling the measured wireless access point to send a detection frame to users in the coverage range, and determining path loss from the measured wireless access point to all users in the coverage range; determining a time slot allocation result according to the load state of networking, the area where each user is located and the communication requirement of each wireless access point; according to the system real-time throughput of the time slot and the path loss from the wireless access point to all users in the coverage range of the wireless access point, determining the transmitting power of the scheduling wireless access point and the non-scheduling wireless access point in the time slot; and issuing the time slot allocation result and the transmitting power of each wireless access point to each wireless access point, so that the wireless access point works at the specified transmitting power in the specified time slot. According to the method, the flexible deployment of the network can be ensured while the spatial multiplexing efficiency is improved.

A transmission station that performs wireless communication with a receiving station at a predetermined carrier frequency performs orthogonal frequency division multiplexing on a symbol sequence, performs orthogonal time frequency space multiplexing on a symbol sequence, performs switching between orthogonal frequency division multiplexing and orthogonal time frequency space multiplexing to input a symbol sequence obtained by mapping a bitstream to only one of them, obtains a relative velocity between the transmission station and a receiving station, controls the switching based on a velocity; and transmits a switching notification that is a control signal to the receiving station, when the switching is controlled.

Spatial reuse is provided. A device can identify first symbols orthogonal to second symbols, responsive to a receipt of an indication, from a second device, of a transmission of a second message including the second symbols. The device can transmit a first message including the first symbols, simultaneously with the transmission of the second message.

The present disclosure relates to a communication method, apparatus, device and system, a storage medium and a program product, and relates to the technical field of communications, the method comprising: executing at least one of sending a PUSCH to a network device or receiving a PDSCH sent by the network device on at least one port. The at least one port comprises a plurality of ports, the plurality of ports comprise a plurality of port groups, the plurality of port groups comprise a first port group, the first port group comprises at least one port, and the first port group is associated with a first time unit. The PUSCH or the PDSCH sends and / or receives on the first time unit, and the PUSCH or the PDSCH carries the first DMRS; or, the PUSCH or the PDSCH is not transmitted and / or received on the first time unit, and the PUSCH or the PDSCH does not bear the first DMRS. The method and the device are used for expanding ports and increasing the number of the ports, so that the system capacity can be increased under the condition that the overhead of the DMRS is not increased, namely, more user numbers and layers can be spatially multiplexed.

To provide a spatial multiplexing optical transmission system using a multicore fiber, which does not use a tone signal and does not require any compensation circuit for phase fluctuations in a receiving circuit.SOLUTION: One of multiple cores is used as an optical length control channel for compensating for optical length fluctuations that occur in a multicore fiber. Coherent optical communication or quantum communication / quantum key delivery is performed using another core in the multicore fiber whose optical length has been controlled by the optical length control channel.SELECTED DRAWING: Figure 1

An absorptive photonic memory comprises absorptive-photonic-memory material, two single-mode ports respectively arranged to receive and transmit memory light to be absorbed by, stored in and emitted from said absorptive-photonic-memory material, and control light that controls said absorptive-photonic-memory material, a multi-mode port connected to the absorptive-photonic- memory material and a spatial multiplexer that spatially multiplexes the two single-mode ports towards the multi-mode port, said spatial multiplexer comprising a plurality of waveguides in a photonic lantern configuration wherein a first subset of the plurality of waveguides is configured to guide the memory light and a second subset of the plurality of waveguides is configured to guide the control light and at least one passive or active optical circuit

An electronic device according to the present invention, which is provided with a plurality of sub-arrays including a plurality of antenna elements and which performs multiuser MIMO communication with a plurality of other electronic devices, comprises a precoder that performs precoding in which spatial multiplexing between the plurality of other electronic devices is performed independently for each orthogonal polarization, and transmits, to the plurality of other electronic devices, a signal having been subjected to the precoding by the precoder.

The invention discloses a two-photon body imaging method and system based on a non-diffraction light needle, and the method comprises the following steps: 1, adjusting the axial focus position distribution and phase shift amount through a quasi-random spatial multiplexing algorithm according to the optical transmission characteristics, penetration depth and spatial resolution requirements of a target biological sample, and obtaining a two-photon body image; generating an optimized composite phase diagram capable of controlling the axial length and the transverse diameter of the light needle; 2, loading the phase diagram to a spatial light modulator, converting a Gaussian beam into a preset non-diffraction light needle, driving a light beam scanning module to realize single two-dimensional scanning of the light needle, and synchronously capturing a fluorescence signal to complete millisecond volume data acquisition; and 3, performing time-space mapping and information reconstruction on the time domain fluorescence signal to generate a two-dimensional projection image containing three-dimensional information. According to the invention, through effective control and rapid modulation of the light beam form, a high-speed three-dimensional imaging capability which is more friendly to a biological sample is realized, and an effective technical means is provided for researching dynamic activities of deep tissues.

This disclosure provides systems, methods and apparatuses for selectively using spatial reuse (SR) transmissions in the presence of an overlapping basic service set (OBSS) transmission. In some implementations, a wireless communication device may transmit data to another wireless communication device using SR packets in the presence of an OBSS transmission or interference only when the signal strength of SR packets received at the other wireless communication device is greater than an amount of signal degradation of the OBSS transmission caused by the SR transmission.

A communication device respectively establishes a plurality of wireless communication connections with a plurality of predetermined devices in an infrastructure network, and includes a wireless transceiver and a processor. The wireless transceiver transmits or receives wireless signals. The processor selects a spatial reuse mechanism, generates spatial reuse information according to the spatial reuse mechanism, and transmits at least one packet carrying the spatial reuse information to the predetermined devices. The spatial reuse information defines a pattern of a communication period. The communication period comprises a spatial reuse phase and a non-spatial reuse phase. The spatial reuse information comprises time information of at least one of the spatial reuse phase and the non-spatial reuse phase. In response to a selection of the spatial reuse mechanism, the processor suspends a wireless signal transmission with the predetermined devices during the spatial reuse phase.

To improve efficiency of processing related to feedback of information by a communication device which receives a spatially multiplexed stream.SOLUTION: A communication device includes a transmitter that transmits a reference signal including a plurality of spatial streams, a reception circuit that receives second information related to a part of the plurality of spatial streams in which channel estimation is performed using the reference signal and the second information determined based on first information related to reception quality of the plurality of spatial streams is fed back, and a control circuit that performs scheduling using the second information. The second information may include information for identifying terminals allocated to the part of spatial streams among a plurality of terminals, and may be related to only the part of spatial streams among the plurality of spatial streams.SELECTED DRAWING: Figure 5