160 results about "Space division multiplexing" patented technology

Resource allocation is provided for an integrated access and backhaul (IAB) network, such as a distributed unit (DU) of an IAB. Methods and systems for allocating resources include allocating a first cell-specific pattern of downlink-flexible-uplink (DL-F-UL) availability for one or more slots, allocating a second cell-specific pattern of DL-F-UL availability for the one or more slots. The IAB DU can signal one or more of the first and second cell-specific patterns to an other IAB DU. At least one of the first cell-specific pattern and the second cell-specific pattern defines a slot format different from a DL-F-UL format. Slot format configuration (e.g., semi-static or dynamic SFI) are provided to support space division multiplexing / spatial multiplexing (SDM).

The invention discloses an equivalent self-noise pressure suppression method and device based on a multi-core optical fiber space division multiplexing signal, light emitted by a narrow linewidth laser is split through a first coupler C1, one path of light passes through an acousto-optic modulator AOM to generate a pulse signal, and then the pulse signal passes through a second coupler C2 to generate a pulse signal; the pulse light is divided into two beams of transmission light, the two beams of transmission light are injected into a connected sensing optical fiber through two groups of erbium-doped optical fiber amplifiers (EDFA), two groups of filters, two groups of circulators and a fan-in coupler Fan-in Coupler, and the pulse light is subjected to backward Rayleigh scattering in the sensing optical fiber; based on the dual-channel DAS system, the multi-core optical fiber serves as the sensing optical fiber, three cores and four cores of the multi-core optical fiber are connected in series to form two sensing channels, seven-core space division signals are multiplexed, the equivalent self-noise suppression effect of the seven-core space division signals is analyzed, and the detection capacity of the system for low-frequency weak signals can be improved.

The invention discloses a tunnel multi-parameter synchronous monitoring method based on a seven-core optical fiber and a fusion association early warning system. The system comprises a sensing module, a data acquisition module, a processing module and an early warning monitoring module, the sensing module comprises a seven-core optical fiber arranged in the tunnel, physical parameters in the tunnel are synchronously monitored through the seven-core optical fiber, and the physical parameters comprise temperature, strain and vibration; the data acquisition module is used for acquiring physical parameter data in real time through the sensing module; the processing module is used for demodulating and fusing the physical parameter data signal to obtain parameter information; and the early warning monitoring module is used for displaying the parameter information in a graphical mode for monitoring, and comparing the parameter information with a corresponding preset threshold value to judge whether the tunnel has a potential health risk so as to carry out early warning. According to the system, the seven-core optical fiber space division multiplexing technology is adopted, and comprehensive and real-time subway tunnel health monitoring and early warning can be provided through multi-parameter fusion measurement.

The invention discloses a distributed optical fiber two-dimensional vector sensing system and method, the system uses an acousto-optic modulator group and an optical circulator group to ask a plurality of fiber cores of a multi-core optical fiber in parallel, heterodyne coherent detection uses local oscillator light to improve the signal-to-noise ratio, and through the relation between the fiber core position difference and the direction angle of a two-dimensional sound wave in the aspect of algorithm, the two-dimensional sound wave direction angle is obtained. According to the space division multiplexing distributed optical fiber acoustic sensing system, a two-dimensional vector signal is accurately restored, the measurement vector angle range of the space division multiplexing distributed optical fiber acoustic sensing system for two-dimensional sound waves is 0-360 degrees, the vector sensing range is larger than 50 km and far exceeds that of an existing system, and the detection capacity of the distributed optical fiber acoustic sensing system is greatly improved.

The invention relates to a virtual network mapping method based on double-agent reinforcement learning in a space division multiplexing elastic optical network, belongs to the technical field of communication, and aims to solve the problems of multidimensional resource allocation complexity, fiber core crosstalk and spectrum fragmentation in the space division multiplexing elastic optical network. According to the technical scheme, collaborative optimization mapping is carried out on virtual network requests by setting a link fiber core mapping agent and a frequency spectrum mapping agent, and the collaborative optimization mapping comprises the steps of initializing an underlying optical network topology and a virtual network topology, sorting virtual network sets according to the total bandwidth of the requests, embedding virtual links in a descending order, and executing physical node embedding and path searching. And the intelligent agent selects a link fiber core and spectrum allocation based on the network state feature matrix, and a model is trained through a reward mechanism to realize efficient resource matching. The technical effects are that the real-time performance and efficiency of virtual network mapping are obviously improved, the service blocking rate is reduced, the spectrum resource utilization rate is optimized, and the overall load capacity of the network is enhanced.

The invention discloses a communication parameter monitoring method and system, and relates to the technical field of optical fiber communication, the communication parameter monitoring method is applied to the communication parameter monitoring system, the communication parameter monitoring system comprises a sending end and a receiving end, and the communication parameter monitoring method comprises the following steps: the sending end inserts a preset pilot frequency in to-be-transmitted information to generate a modulation signal; the sending end sends the modulation signal to a receiving end, and a receiving signal is obtained after coherent receiving; the receiving end carries out digital signal processing on the received signal and extracts pilot frequency information; and the receiving end calculates communication parameters between the sending end and the receiving end according to the pilot frequency information. The signal and the frequency domain pilot frequency are simultaneously transmitted and received, and the power of the frequency domain pilot frequency is far less than the power of the signal, so that the influence on the signal can be ignored, the online monitoring can be realized on the basis of not interrupting the communication service, and the multi-damage cooperative monitoring is realized. Through the communication parameter monitoring method, guarantee can be provided for stable operation and resource scheduling of the space division multiplexing system.

Embodiments of the present application provide a method and device for initial access. The method introduces space division multiplexing SSB, and simultaneously transmits multiple SSB beams on the same time-frequency resource, thereby reducing the time domain overhead of SSB while not reducing the resolution of SSB beams.

The invention discloses a space-time-frequency resource multiplexing transmission opportunity sharing method for coordinating multiple satellite flash access points, and belongs to the technical field of high-density deployment of multiple satellite flashes. The method comprises the following steps: acquiring channel state information (CSI) and beam direction parameters of the STA in a specified micro time slot; constructing a dynamic coordination group mechanism to obtain a dynamic coordination group member list and optimized beam forming parameters; constructing a fusion framework of frequency division multiplexing and space division multiplexing; and adopting adaptive resource scheduling to obtain an AP-STA link scheduling scheme and the transmission rate of each link. Through the dynamic coordination group construction and beam forming technology, dynamic compatible group division among a plurality of star flash access points is realized, the same frequency interference is reduced by more than 30%, the number of concurrent connections is increased, and the SINR of a transmission link in a high-density scene is ensured to always meet the service requirements; meanwhile, combined scheduling of TDD time-division dual-time slots and spectrum resources is realized through an enhanced resource allocation frame, and multi-AP concurrent transmission in a single time slot is realized in a single-Hertz frequency band.

The invention provides a manufacturing method of a hollow-core optical fiber preform with a special-shaped structure, and belongs to the technical field of manufacturing of optical fiber preforms. The method comprises the following steps: firstly, providing at least two hollow glass tubes; cutting each hollow glass tube along the axial direction of the hollow glass tube to form a C-shaped section tube with an opening; then, at least two C-shaped section pipes are in butt joint at the openings of the C-shaped section pipes, and a pre-assembly body with a special-shaped section structure is formed through combination; and finally, laser beams are adopted for welding along seams at the butt joint positions of the C-shaped section pipes, so that the C-shaped section pipes are combined into a whole, and the hollow-core optical fiber preform with the special-shaped structure is formed. Through modularized C-shaped pipe butt joint and laser welding, the problem that a complex special-shaped hollow core structure is difficult to manufacture through a traditional method is solved, high-precision forming and stable inheritance of the special-shaped structure are achieved, and a reliable manufacturing basis is provided for space division multiplexing and other frontier optical applications.

Embodiments of the present disclosure relate to a solution for a reader determination for a backscattering transmission. In one aspect, based on a geometric relation between a third device, an activator and at least one second device associated with the third device, a first device determines a second device as a reader for the third device. The first device then transmits a first indication for receiving a backscatter transmission of the third device to the determined second device, and the backscatter transmission is based on an activation signal of the activator. In this way, the original activation signal may be isolated from the backscattering signal through space division multiplexing. Therefore, interference between the activation signal and the backscattering transmission can be minimized, the SIR can be maximized as much as possible.

The wavelength division multiplexer for space division multiplexing may comprise a wavelength division multiplexing fan-out device or a pump signal combiner for multicore fibers.

The utility model discloses an annular multi-user quantum key distribution system based on space division multiplexing. The annular multi-user quantum key distribution system comprises a Charlie relay end, a plurality of user ends and an annular quantum channel, the Charlie relay end and the plurality of user ends are respectively accessed to the annular quantum channel; the Charlie relay end comprises a multi-wavelength pulse generation module, a fan-in module, a first beam splitter, a first fan-out module and a detection module. The utility model discloses an annular multi-user quantum key distribution system based on space division multiplexing, which is characterized in that a multi-wavelength pulse generation module emits pulses with multiple wavelengths, the pulses are coupled to a specified fiber core of a multi-core optical fiber through a fan-in module, and then the pulses reach specified user sides through an annular quantum channel; spatial division multiplexing is utilized to realize simultaneous communication of a plurality of user sides, so that the communication capacity is expanded, and the non-linear effect in the optical fiber is prevented from being increased. And meanwhile, a Sagnac ring structure is adopted, so that the phase stability is very good.

A first UE transmits, on a first unicast link to a second UE, a first RS from a first TRP of the first UE. The first UE receives, based on the first RS transmitted, a first channel measurement for the first unicast link from the second UE and a first interference measurement for a second unicast link from a third UE. The first UE transmits, on the second unicast link with the third UE, a second RS from a second TRP of the first UE. The first UE receives, based on the second RS transmitted, a second channel measurement for the second unicast link from the third UE and a second interference measurement for the first unicast link from the second UE. The first UE applies SDM for the first unicast link and the second unicast link based on the received channel and interference measurements.

The present invention discloses an equally spaced wavelength allocation method for suppressing noise in a multi-core optical fiber quantum key distribution system, and the method is applicable to a space-division multiplexing quantum key distribution optical network. The method mainly considers the main noises involved in the space-division multiplexing system, such as the intra-core noise, inter-core noise, forward noise, and backward noise, and aims to minimize the noise on the quantum channel and maximize the security key rate. A quantum channel equal frequency interval wavelength allocation scheme is proposed, which can ensure that while improving the utilization rate of channel resources, the security key rate is improved, the secure transmission distance is extended, etc. The present invention lays a technical foundation for the fusion transmission of quantum key distribution and classical optical networks, and promotes the application process of quantum key distribution.

A kind of distributed multi-parameter sensing system based on multi-core optical fiber, including laser, laser light source is sent to the signal generator input trigger pulse drive respectively with the signal input end of phase-sensitive optical time domain reflectometer based on Rayleigh scattering and its demodulation device, Raman optical time domain reflectometer based on Raman scattering and its demodulation device, Brillouin optical time domain reflectometer based on Brillouin scattering and its demodulation device are connected, the signal output end of phase-sensitive optical time domain reflectometer and its demodulation device, Raman optical time domain reflectometer and its demodulation device, Brillouin optical time domain reflectometer and its demodulation device is connected with the signal input end of multi-core optical fiber through multi-core optical fiber fan-in fan-out module;The present application utilizes the principle of space division multiplexing, each fiber core in optical cable as separate sensing channel carries out measurement and signal transmission;Multi-core optical fiber fuses three kinds of distributed optical fiber sensing systems together, realizes in-situ measurement and mutual compensation decoupling of temperature, strain and vibration, improves the measurement precision of sensing system.

The invention provides a cooperative communication and sensing optical transmission system based on an elliptical core few-mode optical fiber. The system comprises a transmitting end, the elliptical core few-mode optical fiber and a receiving end. The transmitting end converts a digital signal into a mode encoding sequence through a mode encoder and couples the mode encoding sequence into the elliptical core few-mode optical fiber; the elliptical core few-mode optical fiber effectively reduces crosstalk between modes by utilizing a relatively large effective refractive index difference between different mode groups of the elliptical core few-mode optical fiber, and effectively improves the security of information transmission by utilizing a mode coding mode; the receiving end detects the position of the end face of the output optical fiber through an imaging system and a camera, compensates the position of the end face of the optical fiber through an electric displacement table to improve the mode demodulation performance of the receiving end, and recovers a mode coding sequence into original digital information through a mode decoder and a signal processor. According to the invention, the security of the optical fiber communication system can be effectively improved, crosstalk between modes is reduced, the robustness of mode demodulation of the receiving end is increased, and the performance of the space division multiplexing optical fiber communication system is effectively improved.

The present application relates to an optical fiber splicing device, an auxiliary splicing device and an optical fiber splicing method. The device includes an external fixer, and the external fixer includes a first external fixer and a second external fixer. The center of the first external fixer is provided with a first connection groove, and the two ends of the first external fixer are respectively provided with a first injection groove. Correspondingly, the center of the second external fixer is provided with a second connection groove, and the two ends of the second external fixer are respectively provided with a second injection groove. The first external fixer and the second external fixer can be butted together in the radial direction so that the first connection groove and the second connection groove are butted together to form a connection cavity, and the first injection groove and the second injection groove are butted together to form an injection cavity. The connection cavity is used to place the first section of optical fiber and the second section of optical fiber to be connected, and the injection cavity is used to inject optical glue along the first end and the second end of the first external fixer to bond the first section of optical fiber and the second section of optical fiber to the external fixer. The present application is applicable to the splicing of new optical fibers such as hollow-core optical fiber space division multiplexing optical fiber.

The application relates to a resource allocation method of a full-optical space division multiplexing elastic optical network, and belongs to the technical field of optical network communication. The method comprises the steps of fiber core grouping and spectrum partitioning, fiber core selection and L-shaped frequency block allocation. The fiber core grouping and spectrum partitioning step divides a seven-core optical fiber into three groups, divides an in-group priority area, and sets a grouping partition weight coefficient. The fiber core selection step arranges the fiber cores in descending order according to the fiber core weight values according to the frequency slot usage, the link length and the number of overlapping frequency slots between the fiber cores on a path, selects the fiber core with the maximum weight value as a transmission fiber core, the L-shaped frequency block allocation step obtains an L-shaped frequency block set satisfying the connection type limitation and the crosstalk threshold limitation according to the remaining unallocated frequency blocks and the frequency block allocation limitation condition, and selects the L-shaped frequency block with the maximum weight value as a transmission frequency block by using an L-shaped frequency block weight calculation formula. The application can balance the number of idle slice machines at each node on the network and guarantee efficient transmission of service requests.

The invention discloses a multi-node data fusion sliding carrier phase smoothing pseudo-range measurement method, and belongs to the technical field of navigation system pseudo-range measurement. The method comprises the following steps that: a node A simultaneously performs microwave bidirectional comparison data transmission with each peripheral node in a space division multiplexing manner, and obtains a bidirectional comparison carrier phase smoothing pseudo-range measurement value of each link in a window sliding manner; and the node A completes data fusion of each pseudo-range measurement value by interpolating a weighted filter coefficient to obtain a carrier phase smoothing pseudo-range measurement result after multi-node data fusion. According to the invention, the idea of fusion of communication transmission and navigation ranging is combined, based on a conduction integration system design and a capability of realizing conduction integration by multiplexing a frame structure leader sequence, a multi-node data fusion sliding carrier phase smoothing pseudo-code ranging method is adopted, and multi-node sliding carrier phase smoothing pseudo-range measurement values are fused. Advantages of respective algorithms can be exerted, algorithm insufficiency is avoided, and ranging and time synchronization precision is improved.

A method for configuring a physical uplink shared channel (PUSCH) in a wireless communication network includes: for single frequency network (SFN) transmission of an uplink PUSCH, configuring different transmission configuration indications (TCIs) for different antenna panels of a terminal, wherein the TCI is associated with beam information, the different TCIs are associated with a same transmission resource, the transmission resource comprises a time-domain resource and a frequency-domain resource, and the different antenna panels perform the SFN transmission of the PUSCH using space division multiplexing (SDM).

The invention relates to a multi-core optical fiber cable for communication, and belongs to the technical field of multi-core optical fibers, the multi-core optical fiber cable for communication comprises a conveying cable body, the conveying cable body is composed of a conveying wire core, a reinforcing layer and a protective sleeve, the reinforcing layer continuously wraps the outer portion of the conveying wire core in the length direction of the conveying wire core and is fixed, and the protective sleeve is formed after the reinforcing layer is fixed. The optical fiber is of a fluorine-doped cladding structure, long-distance and low-crosstalk space division multiplexing optical signal transmission can be achieved, the transmission cores of the device are arranged in a multi-core mode, and the transmission cores of the device are arranged in a multi-core mode. Therefore, large-capacity information transmission can be carried out; and the capacity is expanded without increasing the laying space and cost, and the device adopts the metal reinforcing core and the double-sided plastic-coated steel strip armoring to jointly provide excellent pressure resistance, flexibility and high-strength protection performance, so that the normal use function of the device is ensured.

The invention discloses a high-coherence wavelength division-space division multiplexing signal transmission system based on Delta-Sigma modulation. The high-coherence wavelength division-space division multiplexing signal transmission system is composed of a transmitting end and a receiving end. The core architecture of the transmitting end comprises a first narrow linewidth laser (DFB) serving as a light source base, a cascade modulator module (including a first MZM and a phase modulator PM) serving as a signal processing core, a demultiplexing demultiplexer, an annular cavity, a second DFB, a second MZM and a wavelength division multiplexer. The cascade modulator module is mainly used for generating an optical frequency comb with a narrow linewidth distribution characteristic, a single comb line of the optical frequency comb is used as an independent carrier, and multiple paths of signals combined by a wavelength division multiplexer are sent to a multi-core optical fiber, so that the combination of wavelength division and space division multiplexing technologies is realized, and the capacity upper limit of communication transmission is remarkably improved. According to the invention, the maximization of the communication capacity is realized under the condition of limited link bandwidth, and meanwhile, the undistorted transmission is ensured.

The application provides a grouping method and device of a user terminal, electronic equipment and a storage medium, and belongs to the technical field of wireless communication, and the application updates the maximum total data stream number that can be supported by matching MU-MIMO through the maximum total data stream number that can be distributed by the current user terminal, and is beneficial to improving the accuracy of grouping the current user terminal. When the sum of the existing total data stream number of the existing user terminal in the matching MU-MIMO group and the required data stream number of the current user terminal is less than or equal to the updated maximum total data stream number that can be supported, the current user terminal and the existing user terminal are both in spatial domain orthogonality, the current user terminal is added to the matching MU-MIMO group, the grouping of the current user terminal meets the transmission rate requirement of the user terminal as much as possible, meanwhile, the inter-user interference caused by "space division multiplexing" and the maximum utilization of frequency spectrum resources are taken into account, and the scheduling efficiency of the user terminal is improved.

A Mode-Wavelength Selective Switch (MWSS) (10) comprising: - at least one input path (12) for receiving input optical signals (20) combined using space division multiplexing in an input optical fiber (14) supporting several spatial modes or containing multiple cores, - at least one output path (16) for emitting an output optical signal (22) in an output optical fiber (18), - a mode separator module (24) configured to separate spatially the input optical signals (20) into at least two intermediate optical signals (28); and - an array of beam steering mirrors (26) configured to redirect the intermediate optical signals (28) inside the MWSS (10), at least one of the intermediate optical signals (28) being redirected towards the at least one output path (16).

The invention discloses a multimode cladding pumping resonance space division multiplexing optical fiber amplifier and an implementation method thereof, and relates to the technical field of optical fiber amplifiers. The multimode cladding pumping resonance space division multiplexing optical fiber amplifier comprises a transmission optical fiber, an active optical fiber, a multimode pumping optical fiber and a resonant cavity; the active optical fiber is one of a multimode optical fiber, a multi-core optical fiber and a multi-core multimode optical fiber and is used for realizing stimulated radiation amplification of multichannel signal light; the multi-mode pumping optical fiber is coupled with the active optical fiber through a pumping coupling assembly to form a pumping injection path which is used for accessing an external multi-mode pumping source and injecting pumping light into a cladding of the active optical fiber; by constructing a resonant light path for pumping recycling, residual pumping is converted into reusable effective pumping, so that the residual pumping participates in the pumping effect on the active section for multiple times in the system, the equivalent pumping intensity and the accumulative absorption amount of the active section are improved under the condition that the rated power of an external pumping source is not remarkably increased, and the energy consumption of the active section is reduced. The purposes of improving the gain efficiency and reducing the thermal load are achieved.

The invention discloses a non-linear damage signal processing method and device for a space division multiplexing system, and relates to the technical field of network communication, and the method comprises the steps: inputting a non-linear damage signal in the space division multiplexing system into a feedforward neural network equalizer based on a cascade structure, in the feedforward neural network equalizer based on the cascade structure, an input layer is connected with a middle layer through a first weight, the middle layer is connected with an output layer through a second weight, and the input layer is connected with the output layer through a third weight; and carrying out equalization processing on the nonlinear damage signal through three weights in the feedforward neural network equalizer based on the cascade structure. According to the feed-forward neural network equalizer, the linear path which is directly connected with the input layer and the output layer is introduced into the feed-forward neural network equalizer, the effect of united linear and nonlinear optimization on the received signals can be achieved, nonlinear damage of the signals is effectively restrained, only the low number of real multiplication times is additionally introduced, and the extra overhead of complexity is extremely low.

The application discloses a design method and system of a polarization detection metasurface. The method comprises the following steps: establishing a microstructure model, scanning the phase delay of microstructures with different geometric sizes under x and y polarizations; specifying two groups of orthogonal polarization states and target propagation angles, calculating the supercell size and the number of microstructures contained therein, and confirming the polarization beam splitting target required under the two groups of orthogonal polarization states; calculating the Jones matrix of each microstructure in the supercell and selecting a group of microstructure parameters as the initial solution; establishing a supercell model according to the initial solution and performing forward propagation simulation to obtain the diffraction order intensity distribution under the two groups of orthogonal polarizations, and constructing a loss function to obtain the optimal supercell structure meeting the polarization beam splitting target after iterative optimization; and performing two-dimensional periodic expansion on the supercell structure to obtain a metasurface structure. The application can realize efficient separation of multiple polarization states on a single metasurface, avoids the crosstalk problem in the traditional space division multiplexing mode, and improves the spatial resolution.

The present invention relates to the technical field of multiplexing and demultiplexing devices in space division multiplexing, and more specifically, to a mode group demultiplexing method and device based on a cascade diffraction network. The mode group demultiplexing method adopts a strategy of non-deterministic mode conversion to design and optimize the cascade diffraction network, which improves the freedom of the output mode field, so that the phase plate design can be carried out with greater freedom, thereby significantly improving the efficiency of beam conversion and greatly reducing the number of phase plates required. The present invention overcomes the shortcomings of low energy efficiency and stability in mode group demultiplexing, and reduces device loss by improving and optimizing the design.

A plurality of configurations for an uplink phase tracking reference signal (PTRS) and downlink control information (DCI) for scheduling a PUSCH associated with a transmission parameter indicating one of a single transmit receive point (sTRP) physical uplink shared channel (PUSCH) or a space division multiplexed (SDM) PUSCH are received from a network entity. One or more uplink PTRS configurations are identified based on the transmission parameters. The PUSCH is then transmitted to the network entity, where the PUSCH is associated with the identified one or more uplink PTRS configurations based on an association between the identified one or more uplink PTRS configurations and a demodulation reference signal (DMRS) port.

The invention discloses a frequency domain equalization method, device and equipment based on matrix inversion, and a storage medium, relates to the technical field of signal processing, and discloses a frequency domain equalization method based on matrix inversion, and the method comprises the steps: carrying out the transmitting end signal processing of a pseudo-random binary sequence at a transmitting end based on a constant amplitude zero autocorrelation sequence, and obtaining a transmitting end optical signal; receiving the sending end optical signal transmitted through the space division multiplexing channel at a receiving end to obtain a receiving end optical signal, and performing receiving end signal processing on the receiving end optical signal to obtain a to-be-balanced signal; determining a current channel matrix of a space division multiplexing channel based on the constant amplitude zero autocorrelation sequence and the signal to be equalized; and performing third-order iteration inversion on the current channel matrix to obtain a current inverse matrix, and performing linear detection on the to-be-balanced signal based on the current inverse matrix to obtain a frequency domain balanced output signal. According to the method, the iteration inversion convergence speed in the frequency domain equalization process can be accelerated, and the channel equalization efficiency is improved.