248 results about "Spherical wave" patented technology

The invention discloses a multi-target CRB minimization method based on near-field flux and inductance integration of rate splitting, and relates to the technical field of wireless communication and novel multiple access. The method comprises the following four steps: S1, establishing a near-field communication channel and a near-field sensing channel according to a spherical wave propagation model; s2, the base station encodes information required by a communication user into public and private information streams by using a rate splitting multiple access technology and sends the public and private information streams to the user side; s3, according to the array response vector of the near-field sensing channel, deriving CRBs for simultaneously estimating angles and distances of a plurality of sensing targets; and S4, establishing an optimization problem by satisfying the communication rate requirement and minimizing the CRB of multiple targets, and jointly optimizing the hybrid beam forming matrix and the common rate allocation variable by using a penalty dual decomposition and block coordinate descent method. The method can achieve the simultaneous estimation of the distances and angles of a plurality of sensing targets, and effectively reduces the estimation error.

A flying-over beam pattern scanning hologram microscope device includes: a scan beam generation unit which converts a first beam and a second beam to a first spherical wave and a second spherical wave, and then allows the first and second spherical waves to interfere with each other to form a scan beam; a scanning unit, which comprises a scan mirror for controlling the scan beam in the horizontal direction, and a translation stage for moving an object in the vertical direction at the rear end of the projection unit; the projection unit projecting the scan beam onto an object plane; and a light collection unit for detecting a beam that has passed through the objective lens again after fluorescing or being reflected from an object.

The invention discloses a target detection and channel estimation method for a near-field sensing integrated system. The method comprises the following steps: a base station sends a downlink pilot signal to a sensing target and receives a corresponding echo signal; then, a user sends an uplink pilot signal to estimate a user channel; according to the characteristics of a near-field channel, a sensing and communication signal model based on a spherical wavefront hypothesis is established; according to the characteristics of a near-field channel, firstly, a near-field channel model is approximated by adopting Fresnel approximation, then a low-overhead dictionary based on near-field spherical wave approximation is provided, and on the basis, an improved orthogonal matching pursuit algorithm is designed for near-field communication perception to estimate parameters of a perception target and a communication channel. According to the invention, parameters of a near-field sensing target and a channel can be estimated with low overhead, and the estimation precision of the parameters in a near-field scene is improved.

The present invention discloses a method for modeling ultra-large-scale MIMO geometric random and beam-domain wireless channels, and the specific steps include: 1) setting simulation parameters, network layout, etc., generating initial large-scale parameters, and generating initial clusters based on model initialization parameters; 2) updating large-scale and small-scale parameters; 3) generating geometric random channel model channel coefficients, steering matrices, and beam-domain channel matrices; 4) analyzing channel characteristics, and verifying the accuracy of the model by comparing with measured data. The wireless channel modeling method established by the present invention supports spherical waves and spatial non-stationary characteristics, and can realize the conversion from geometric random to beam-domain channel models under near-field conditions. The model accuracy is verified by the consistency of simulation and measurement results of space-time-frequency correlation functions and channel capacity. The present invention has guiding significance for the design and performance evaluation of ultra-large-scale MIMO communication systems.

The invention relates to a spherical wave oscillation-slow nuclear high-order decoupling method and device for physical property inversion, and belongs to the field of geophysical detection and acoustic detection. The method comprises the following steps: obtaining and inputting observation data, and initializing seabed elastic parameters; determining an integral interval according to the observation data, decomposing the integral interval into a plurality of sub-intervals, and setting a decoupling order; calculating an oscillation nuclear local integral matrix of each order corresponding to the observation data incident angle; calculating the angle deviation guiding quantity of each order of the slowly-varying kernel; calculating a reflection coefficient vector of each order of spherical wave; calculating a spherical wave reflection coefficient of high-order decoupling; and solving a subsequent inversion problem by using the obtained high-order decoupled spherical wave reflection coefficient. According to the method, the calculation efficiency of the seabed spherical wave reflection coefficient in the inversion process is effectively improved; the decoupling order is improved, the calculation precision is improved, or the number of the subintervals can be reduced by improving the decoupling order under the condition that the calculation precision is certain.

The invention relates to a seabed elastic parameter inversion method, system and device under an earthquake spherical reflection wave oscillation-gradual change nuclear decoupling framework, and belongs to the field of geophysical detection and acoustic detection. The method comprises the following steps: (1) inputting observation data and initializing seabed elastic parameters; (2) determining an integral interval and decomposing the integral interval into a plurality of sub-intervals; (3) calculating an oscillation nuclear local integral matrix corresponding to the incident angle of the observation data; (4) calculating a slowly-varying kernel local mean vector; (5) calculating a spherical wave reflection coefficient of oscillation-gradual change kernel decoupling; and (6) constructing a target function by using the decoupled spherical wave reflection coefficient, and solving the target function. In the objective function solving process, only the steps (4) and (5) need to be repeatedly executed after the seabed elastic parameters are updated, the oscillation nuclear local integral matrix in the step (3) does not need to be repeatedly calculated, redundant calculation about oscillation nuclear integration is avoided, and the calculation efficiency is improved.

Disclosed are a system and a method for a high-speed performance measurement. The system includes: a fixing part; a positioner for controlling the rotation of the equipment by controlling the fixing part; a measurement probe; a curved reflective plate for reflecting, in the direction of the measurement probe, an electromagnetic wave radiated by the equipment and transforming the spherical wave of the measurement probe into a plane wave at the position where the equipment is provided; an arc structure including an arc arranged to be adjacent to the fixing part; a probe set including near-filed probes arranged to be spaced predetermined intervals apart from each other on the inner side of the arc; and a control unit, which receives, through a signal analyzer, signal data corresponding to an input signal from some of near-filed probes and the measurement probe.

The invention provides a near-field electromagnetic source positioning method based on array signal processing, and relates to the technical field of electromagnetic signal detection and positioning, and the method comprises the steps: constructing an array receiving signal model based on the wave-front characteristics of an electromagnetic wave spherical surface, and employing a steering vector for the construction; a sensor array is used for collecting near-field radiation source signals, and amplitude calibration processing is carried out on the near-field radiation source signals to form an array data set. According to the near-field electromagnetic source positioning method based on array signal processing, high-precision three-dimensional positioning of a near-field electromagnetic source is realized by combining amplitude calibration, characteristic decomposition and joint optimization processing through an array receiving signal model based on electromagnetic wave spherical wavefront characteristics. According to the near-field electromagnetic source positioning method based on array signal processing, a multi-dimensional optimization strategy is introduced in the signal subspace extraction and parameter estimation process, the estimation precision of the distance, the pitch angle and the azimuth angle is improved, and the positioning stability and robustness in a complex electromagnetic environment are improved.

The invention provides a high-gain low-RCS (radar cross section) metasurface antenna with a wave beam deflection function, which belongs to the technical field of electromagnetic metamaterials and comprises an upper-layer metasurface and a lower-layer metasurface, and multifunctional regulation and control on an electromagnetic wave radiation scattering mode are realized by adopting the upper-layer metasurface and the lower-layer metasurface which are different in size. Wherein the upper-layer metasurface is a PCM-FSS scattering-transmitting integrated metasurface, and the lower-layer metasurface is a phase gradient metasurface. When the high-gain low-RCS metasurface antenna works in a radiation mode, the upper-layer metasurface emits spherical electromagnetic waves downwards, and when the spherical waves reach the lower-layer metasurface, the spherical waves are reflected into high-gain directional wave beams with the deflection angle being 34 degrees through phase compensation and penetrate through the upper surface to be radiated to a free space; when working in a scattering mode, the upper and lower layers of metasurfaces can deflect reflected waves of external electromagnetic waves to a non-threat angular domain direction. In the frequency band of 8-18 GHz, the RCS reduction amplitude reaches 10 dB or above, and in-band and out-of-band large-amplitude RCS reduction is achieved while high-gain radiation is kept.

The invention relates to the technical field of sensor sensing, and discloses a microspur sensing method and system for an MEMS ultrasonic sensor array, and the method comprises the steps: carrying out the phase calibration of the MEMS ultrasonic sensor array, and obtaining a phase calibration parameter; performing near-field spherical wave phase compensation on the phase calibration parameter based on the macro target distance and the incident angle to obtain a near-field compensation parameter; controlling the MEMS ultrasonic sensor array to execute beam forming of wide beam scanning and narrow beam focusing according to the near-field compensation parameter to obtain a macro focusing sound field; transmitting ultrasonic waves to a rear vehicle target through the micro-distance focusing sound field and receiving a reflection signal, and performing vehicle feature recognition on the reflection signal to obtain a vehicle recognition result; and positioning calculation of the target angle and distance is carried out based on the vehicle identification result to obtain rear vehicle positioning data, and the angle resolution and the distance measurement precision in a microspur range are improved.

The invention relates to a multi-beam switching antenna applied to a wind finding radar and a working method of the multi-beam switching antenna. The antenna comprises a connecting device, a feed device and a lens device, the connecting device is a subminiature push-in connector, the input end of the connecting device is connected with the wind finding radar, and the output end of the connecting device is connected with the feed device; the feed device comprises a GCPW-SIW conversion structure and a feed source antenna. Wherein the feed source antennas are sixteen antipodal Vivaldi antennas and are used for radiating spherical waves to the lens device; the lens device is a metasurface lens, and the feed device and the lens device are arranged in an offset-focus mode. Therefore, phase compensation is carried out on spherical waves radiated by a feed device located at the focus of the lens, and the spherical waves are converted into plane waves of the emergent surface of the lens. Compared with the prior art, the method has the advantages that the actual application requirement of a wind measurement radar system is met, and accurate wind field measurement and data acquisition are achieved.

The invention discloses a spherical near-field antenna measurement method and system, and the method comprises the steps: generating a sampling point coordinate sequence on a measurement spherical surface based on a preset algorithm, and enabling the sampling point coordinate sequence to form a continuous spiral track from a first pole to a second pole; controlling the measuring probe to move at a constant speed along the continuous spiral track, and synchronously acquiring near-field complex electric field data of the to-be-measured antenna when the measuring probe moves to each sampling point to form a complex electric field data vector; constructing a linear equation of spherical wave expansion based on the complex electric field data vector, the sampling point coordinates and the measured spherical radius, and solving the linear equation by adopting a regularization method to obtain a spherical wave coefficient vector; and calculating a far-field pattern of the to-be-tested antenna based on the spherical wave coefficient vector. According to the invention, the technical problems of high sampling redundancy, discontinuous mechanical scanning path, dependence on interpolation and low precision in the existing antenna measurement technology are solved.

A flying-over beam pattern scanning hologram microscope device includes: a scan beam generation unit which converts of a first beam and a second beam to a first spherical wave; a scanning unit, which includes a spatial modulation scanner for controlling the scan beam in the horizontal direction, and a translation stage for moving an object in the vertical direction at the rear end of the projection unit; the projection unit projecting the scan beam onto an object plane; and a light collection unit which detects a beam that has passed through the objective lens again after being reflected or fluoresced from the object.

The invention discloses an ultrathin dual-polarized lens antenna based on a double-layer Huygens metasurface, and relates to the technical field of plane transmission array antennas. The ultrathin dual-polarized lens antenna based on the double-layer Huygens metasurface is provided with a horn antenna feed source module and a double-layer Huygens metasurface module. The double-layer Huygens metasurface module is composed of a medium supporting layer in the middle and metal patch layers of which the top layer and the bottom layer are identical in structure. The unit grids of the double-layer Huygens metasurface module are arranged according to hyperbolic phase distribution to form a super-lens function, and quasi-spherical waves emitted by the horn antenna feed source module are converted into plane waves emitted in a single direction, so that the directivity and radiation gain of electromagnetic waves are improved. The antenna has the advantages of dual polarization response, ultra-thin thickness smaller than one tenth of wavelength, easy integration, high radiation gain and high aperture efficiency, and can be widely applied to the fields of millimeter wave communication systems, wireless power transmission and the like.

A seismic energy estimation method based on generalized spherical wave propagation, relating to the field of earthquake engineering. The method comprises: determining initial seismic total energy and seismic power on the basis of seismic source characteristics and a seismic magnitude; determining a generalized spherical wave equation, and calculating an average energy flow density of propagated waves on the basis of the wave equation of spherical waves; using an earth surface spherical crown, which is projected on the zone of a seismic source surface, as a main impact zone of seismic spherical waves on an earth surface, the main impact zone being equivalent to a square and performing grid division, and calculating the hypocentral distance between the center of each grid and the center of a seismic source so as to form a hypocentral distance matrix; and expressing the generalized spherical wave energy flow density of each grid as the sum of the energy flow density of longitudinal waves and the energy flow density of transverse waves, performing grid subdivision, estimating the average amplitude of each subdivided grid mass unit within a seismic action period, and evaluating the seismic action energy of a site. The present invention estimates the action of seismic energy on the earth surface by defining the generalized spherical wave propagation of seismic source energy, thereby more accurately evaluating the distribution condition of seismic energy on the earth surface.

The invention provides a multiple-input-multiple-output channel model construction method and device, network equipment and a medium, and relates to the technical field of wireless communication. The method comprises: according to at least one obtained model parameter, determining a spatial non-stationary matrix and a near-field spherical wave matrix corresponding to a multiple-input-multiple-output (MIMO) channel, the at least one model parameter being obtained based on a three-dimensional (3D) MIMO channel model; elements in the spatial non-stationary matrix are used for describing the visibility of clusters in the MIMO channel to antenna array elements, and the near-field spherical wave matrix is used for describing the influence of spherical wave propagation on signal amplitude and phase; and according to the spatial non-stationary matrix and the near-field spherical wave matrix, a target MIMO channel model is constructed, and the target MIMO channel model is used for simulating a channel coefficient of the MIMO channel. According to the scheme of the invention, the problem that the existing MIMO channel model is not suitable for the simulation test of a large-scale MIMO channel is solved.

A three-dimensional (3D) superdirective antenna and optimization method is disclosed herein. The antenna includes: a multilayer substrate, a plurality of radiating elements, and an excitation module. The several radiating elements are mounted on the multilayer substrate to form a 3D radiating element array. The excitation module includes an excitation circuit and a beamforming module that measures radiation fields generated by the array both with and without coupling effects. An embodiment may also generate a coupling matrix based on spherical wave coefficient expansion of the measured radiation fields and determine a superdirective excitation vector based on the coupling matrix. An embodiment may also excite the radiating elements using the excitation vector to generate a superdirective beam. Compared with existing antenna technology, embodiments disclosed herein may dynamically realize a superdirective beam in an alignment direction and demonstrate excellent performance in both directivity and realizable gain.

The invention belongs to the field of optical measurement and detection, and particularly relates to a coherence tomography wavefront measurement device and method based on optical fiber interconnection and point diffraction, the measurement device separates a fundamental mode and a high-order mode of test light through a few-mode optical fiber, the fundamental mode generates a reference spherical wave through point diffraction to serve as reference light, and the high-order mode serves as the test light; after the test light and the reference light are subjected to optical fiber coupling interference, an interference pattern is obtained by a detector, and wavefront error measurement and optimization are realized through wavefront calculation and correction. The method has high precision and high stability, and can realize rapid closed-loop feedback correction.

This invention provides a near-field millimeter-wave codebook generation method and related components. The near-field millimeter-wave codebook generation method is applied to a near-field hierarchical communication beamcodebook system. The method includes: obtaining the level number of the codebook at the current level in the near-field hierarchical communication beamcodebook system; determining the codebook level of the current level according to the relationship between the level number and a preset level, wherein the codebook level includes an upper-level codebook and a lower-level codebook; and obtaining a near-field millimeter-wave communication codebook based on the codebook level of the current level. The near-field millimeter-wave codebook generation method provided by this invention considers the characteristics of the spherical wavefront in the near-field region, avoids performance degradation, and achieves coverage of the entire Fresnel region. It designs a lower-level codebook covering polar coordinates and an upper-level codebook designed to reduce beam search overhead.

The application discloses a near-field strong interference suppression method based on spherical wave deconvolution beam forming positioning, which comprises the following steps: performing fine grid division on a near-field scanning area of a linear array; performing spherical wave focusing beam forming on the near-field scanning area and two-dimensional deconvolution beam forming about distance-angle under the condition of unknown sound source position; calculating the distribution entropy characteristics of the deconvolution beam forming result in the angle dimension, and using a preset threshold to correlate the interference positioning of a target; constructing an array flow pattern matrix A of each near-field target l and generating a covariance matrix A; calculating the orthogonal complement space projection matrix of the covariance matrix A, and applying the orthogonal complement space projection matrix to the array element domain covariance matrix C to perform near-field interference suppression; using a far-field plane wave model to perform deconvolution beam forming calculation on the covariance matrix for suppressing near-field interference, so as to obtain passive detection results of the near-field strong interference suppression. The application can realize near-field interference positioning and interference suppression under the condition that the interference position is unknown.

The present invention relates to a fly-by light beam pattern scanning hologram microscope apparatus using a scanning mirror and a transfer stage. The present invention provides a fly-by light beam pattern scanning hologram microscope apparatus, comprising: a scanning light beam generating unit modulating a phase of a first light beam separated from a light source to convert the first light beam into a first spherical wave through a first lens, converting a second light beam into a second spherical wave through a second lens, and then making the first spherical wave interfere with the second spherical wave to form a scanning light beam; a scanning unit including a scanning mirror for controlling the scanning light beam in a horizontal direction to transmit it to a projection unit and a transfer stage for moving an object in a vertical direction at a rear end of the projection unit; a projection unit including a plurality of lens systems and an objective lens and projecting the scanning light beam transmitted from the scanning unit on an object plane; and a light collecting unit for detecting a light beam that has passed through the objective lens again after fluorescing or reflecting from the object, wherein the scanning light beam projected on the object plane has different patterns according to a conical angle condition and a focal point position of each of the first spherical wave and the second spherical wave formed on the scanning mirror.

The utility model discloses a light interference and diffraction experiment device, which comprises a laser transmitter and a first experiment part, the first experiment part comprises an interference instrument and a diffraction instrument; the interference device is of a thin sheet structure with uniform thickness, can be arranged on a propagation path of a laser beam, and divides the laser beam incident to the interference device into two emergent beams, so that the interference phenomenon of light is observed; the diffraction instrument can be arranged on the propagation path of the laser beam, one half of the laser beam entering the diffraction instrument is shielded, and the other half of the laser beam forms a spherical wave at the edge of the diffraction instrument, so that the diffraction phenomenon of light is observed. According to the utility model, the first experiment part can reproduce a Young's double-slit interference experiment and a Fraunhofer single-slit diffraction experiment only by using a flat sheet under the condition that double slits and single slits are not needed, and can intuitively show physical mechanisms such as wave splitting surfaces and wave surface limitation; and experiments of circular hole diffraction, cross diffraction, Poisson bright spots and the like can be demonstrated.

The invention provides a curved surface polarization torsion reflecting surface and an antenna using the same, and belongs to the technical field of antennas. The curved surface polarization torsion reflection surface comprises a curved surface dielectric plate, and a metal bottom plate and an electromagnetic metasurface which are respectively arranged on the outer side and the inner side of the curved surface dielectric plate; the electromagnetic metasurface is formed by periodically arranging a plurality of single-layer electromagnetic metasurface units. The single-layer metasurface unit with the polarization torsion function is conformal on the curved surface, so that the technical problems that a traditional multi-layer planar polarization torsion structure is complex to process, curved surface conformal is difficult, and the performance is deteriorated after conformal are solved. The reflecting surface is preferably a paraboloid, so that the incident wave polarization torsion is realized, and the spherical wave can be converted into the plane wave to improve the antenna gain. The metasurface unit keeps good cross polarization reflection performance within the wide incidence angle range of 0-40 degrees, is suitable for curved surface conformal design, can be integrally formed through 3D printing, and is easy and convenient to machine and stable in performance.

The present application belongs to the field of rail transit wireless communication technology, and discloses a subway Wi-Fi 7 signal coverage system and method based on kneading antenna, the system comprises: a medium waveguide arranged along a subway tunnel, a kneading antenna movably attached to the medium waveguide, a Wi-Fi 7 access point connected to the medium waveguide, and a control unit. The method comprises: obtaining the position of a user terminal and establishing a channel based on a near-field spherical wave model; the control unit executes a joint optimization algorithm to calculate the optimal kneading antenna position and digital beamforming matrix; the kneading antenna is controlled to move to the optimal position, and the access point transmits signals using the optimal beamforming matrix. The present application moves the kneading antenna to a position close to the user, combines the low-loss transmission characteristics of the medium waveguide, shortens the wireless propagation distance of high-frequency signals, and realizes precise coverage of mobile users through perception-driven dynamic position reconstruction and joint beamforming, thereby improving the quality of train-ground communication.

This application discloses a method, apparatus, device, and medium for self-calibration of an ultrasonic sensor for transformers. The method involves obtaining the spatial distance by using the time difference and measured sound velocity of the same partial discharge pulse received by a built-in UHF antenna and an external ultrasonic sensor; constructing a cross-medium model based on the acoustic parameters of the insulating oil and the tank to calculate the sound pressure transmission coefficient at the liquid-solid interface; constructing a spherical wave dissipation equation in viscous oil by combining discharge and fluid parameters, and calculating the theoretical sound pressure of the outer shell using the distance and transmission coefficient; comparing the measured peak output voltage of the external sensor with the in-situ acoustic-electric conversion sensitivity for online self-calibration. This method reconstructs a high-fidelity sound wave propagation attenuation model, which can improve calibration accuracy and diagnostic reliability.

The invention discloses an infrared super lens with a moth eye imitating anti-reflection nano structure. The moth-eye anti-reflection metasurface, the metasurface lens and the substrate are all made of silicon materials, and the moth-eye anti-reflection metasurface and the metasurface lens are micro-nano-scale arrays and are located on the two sides of the same substrate respectively. According to the invention, the metasurface is fully utilized to finely and efficiently modulate the phase, amplitude and other characteristics of light waves, the moth-eye metasurface changes the effective refractive index of the surface and reduces the reflectivity of incident light on the silicon surface, the metasurface lens enables the phase distribution to meet the spherical wavefront contour, efficient focusing of emergent beams is realized, and the light quality is improved. All micro-nano structures have the advantage of good thermal stability based on the same substrate material, and anti-reflection and focusing effects are achieved in an extremely thin scale.

The invention discloses an antenna regulation and control method based on collaborative design of a gradient refractive index dielectric lens and a hyperbolic reflecting surface, and belongs to the technical field of communication, and the method comprises the following steps: S1, collaborative design of the gradient refractive index dielectric lens and the hyperbolic reflecting surface: designing the gradient refractive index dielectric lens, spatial shaping is carried out on a wavefront phase by utilizing the characteristic of a non-uniform material, so that accurate regulation and control on electromagnetic waves are realized; a hyperbolic reflecting surface is designed, and spherical waves radiated by a feed source are efficiently converted into collimated plane waves by using geometric focusing characteristics of the hyperbolic reflecting surface; s2, optimizing and integrating an antenna structure; s3, data collection and preprocessing; s4, constructing and training a deep learning beam optimization algorithm; s5, applying a beam optimization algorithm and performing real-time regulation and control; according to the invention, through collaborative design and a deep learning algorithm, the technical bottleneck of a traditional antenna is broken through, the main lobe gain and the pointing precision are remarkably improved, the side lobe interference is reduced, and the antenna is suitable for scenes such as satellite communication and high-precision navigation and is compatible with various communication standards.

The application discloses a low-profile wave beam regulation millimeter wave antenna loaded with Huygens super surface, which comprises a non-biased substrate integrated waveguide slot array antenna and a near-field Huygens super surface; the non-biased substrate integrated waveguide slot array antenna is composed of a first dielectric substrate, metal structures printed on the top and bottom of the first dielectric substrate, a slot array etched on the metal structures and metal through holes in the first dielectric substrate; the near-field Huygens super surface comprises a second dielectric substrate and metal structures on the top and bottom of the second dielectric substrate; the non-biased substrate integrated waveguide slot array antenna serves as an excitation source to provide a spherical wave, and the near-field Huygens super surface is used for precisely regulating the phase distribution above the slot array antenna. The application has the characteristics of low profile and can realize two-dimensional wave beam regulation based on different super surface distributions.

The application discloses a crimped cylindrical wave tight field device, which mainly comprises a crimped parabolic cylindrical reflector, a feed source, a quiet zone and a virtual line source. The parabolic cylindrical reflector can correct the cylindrical wave formed by the spherical wave emitted by the feed source in the quiet zone. In order to control the diffraction of the edge of the reflector, the edge of the parabolic cylindrical reflector needs to be processed. The crimped edge of the parabolic cylindrical reflector can reduce the low-frequency limit of the cylindrical wave tight field. Compared with the sawtooth cylindrical wave tight field, the electric size of the reflector working at the low-frequency limit is smaller, and the engineering realization of the large cylindrical wave tight field is more favorable.

The invention discloses a super-large-scale MIMO communication system, a user scheduling method thereof and a medium, and relates to the technical field of MIMO communication systems.The method comprises the steps that a channel model containing a spherical wave propagation model is established in a near-field communication scene, and the near-field propagation characteristic that the antenna array size is equivalent to the user distance is considered; obtaining a beam focusing vector of the user based on a channel model; calculating to obtain beam focusing vectors and correlation between the beam focusing vectors; using an alternative optimization algorithm to jointly optimize user scheduling and power distribution, including grouping the users based on the correlation, so that the users in each group have similar channel conditions; and the total spectrum efficiency of the system is maximized under the condition that the minimum spectrum efficiency constraint and the total transmitting power constraint are met. According to the invention, interference among users can be effectively reduced, and the accuracy and efficiency of user scheduling can be improved by an alternative optimization scheduling method.