66 results about "Propagation matrix" patented technology

OFDM signals each including a plurality of subcarriers (including data carriers and pilot carriers) orthogonal to each other are received by a plurality of receiver antennas. The received OFDM signals are each OFDM-demodulated into a plurality of receive subcarriers. Based on the plurality of receive subcarriers, the propagation coefficients of a plurality of space paths are estimated. An inverse matrix of a propagation matrix whose elements are the estimated propagation coefficients is calculated. Interference cancellation is performed for the plurality of receive subcarriers by using the inverse matrix, and transmit subcarriers multiplexed in space are estimated. A reliability of the inverse matrix is calculated. A pilot carrier is extracted from the estimated transmit subcarriers, and the extracted pilot carrier is weighted according to the reliability. An error included in the plurality of receive subcarriers is corrected based on the weighted pilot carrier.

The invention belongs to the field of exploration geophysics and particularly relates to an elastic seismic wave field forward modeling method. The seismic forward modeling method includes the steps of firstly, according to the principle of wave field vector decomposition, decomposing a seismic wave field into a longitudinal wave field and a transverse wave field and respectively calculating corresponding propagation matrixes of the longitudinal wave field and the transverse wave field; secondly, according to the principle of low-rank decomposition, decomposing the propagation matrixes to obtain propagators of vector longitudinal wave and vector transverse wave so as to reduce calculation amount of numerical simulation to improve calculation efficiency; and thirdly, coupling updated records of the vector longitudinal wave and the vector transverse wave acquired after the numerical simulation so as to obtain a forward modeling result of the seismic wave field. The calculation precision is high due to the fact that the propagation matrixes include compensations to medium parameter and numerical simulation parameter. Numerical dispersion of seismic wave field records acquired by the forward modeling method is nearly eliminated and stability of the numerical simulation is high; accordingly, the forward modeling method is a high-precision elastic wave field numerical simulation method.

Enhancement of wireless Channel Order and rank (ECHO) systems and ECHO repeater devices for enhancement of a wireless propagation channel for point to point or point to multipoint radio configurations are disclosed. The enhancement may be used for MIMO communications channels. Aspects support a richer multipath environment to increase the rank of the channel propagation matrix and / or to increase the magnitude of the coefficients of the propagation matrix between two or more radios. Such enhancement is applicable to backhaul radios in terms of increased range or in the number of supportable information streams. The installation, provisioning, optimization, control, monitoring, and adaptation of such devices within a network of backhaul radios is also disclosed. Wireless links and control between IBR and ECHO devices, and between ECHO devices and other ECHO devices, are also disclosed.

The invention relates to the technical field of estimating the signal arrival direction by adopting an array antenna and overcomes the defect in the prior art that the conventional propagation operator-based algorithm cannot utilizes all antenna array elements, wherein a new propagation matrix is constructed. The algorithm solves the angle estimation invalidation problem during the actual mobile communication process with the range of pitch angles to be 70-90 degrees. In this way, the estimation performance for the azimuth angle and the pitch angle is improved. According to the technical scheme of the invention, the propagation operator-based 2-L type array two-dimensional DOA estimation algorithm comprises the steps of 1, constructing a received signal matrix; 2, constructing a propagation matrix; 3, estimating a rotation matrix; 4, estimating the azimuth angle and the pitch angle. The propagation operator-based 2-L type array two-dimensional DOA estimation algorithm is mainly used for the design and the manufacture of infinite detection equipment.

The invention discloses a method for improving growth and drought-resistant ability of wheat by using arbuscular mycorrhizal fungi to bring the reciprocal symbiosis relation between AM fungi and host plants under drought stress into play reasonably and efficiently. According to the method, the AM fungi having a close symbiotic relation with the wheat are selectively used, and the symbiotic relation between the AM fungi and the wheat is built in a condition control mode to promote the wheat growth and improve drought adaptability. The AM fungi comprise one of glomus monosporum and acaulospora laevis, the two kinds of AM fungi are respectively propagated in an expanding mode in an expanding propagation matrix by using red clovers, and then two AM fungi inoculants and the wheat are cultured together in a symbiotic culture medium. The effective path for profitable symbiosis of the AM fungi and the host plants in adversity conditions is provided, the infection and symbiosis relation with the host plants of the AM fungi is improved in a man-made mode, and the yield of dry crops is improved.

The present invention discloses a system for visualizing sound source energy distribution and a method thereof, wherein a propagation matrix and a window matrix are obtained firstly; next, an inverse operation of the propagation matrix is performed; next, a multiplication operation of the result of the inverse operation and the window matrix is performed; next, the result of the multiplication operation is transformed from the time domain to the frequency domain; thus, a sound source energy distribution reconstructor is established; then, an array of microphones is used to receive the sound source signals; next, a multi-channel capture device transforms the received sound source signals into digital sound source signals; lastly, a convolution operation is performed on the digital sound source signals and the sound source energy distribution reconstructor to obtain a visualized sound source energy distribution. Therefore, the present invention can provide the energy distributions of nearfield / farfield stable-state / unstable-state sound sources.

The present invention discloses an information security risk propagation control method and apparatus based on an infectious disease model. The method comprises: generating a topology of a power information physical system and expressing the topology as an undirected weighted sparse adjacency matrix; calculating vulnerability, relevance and tolerance of nodes; according to a propagation matrix model of infectious diseases, constructing a node risk propagation matrix; calculating the proportion of dead nodes, comparing the proportion of dead nodes with the preset proportion value of the dead nodes, and when the proportion of dead nodes is greater than the preset proportion value of the dead nodes, evaluating a fault size of nodes in the power grid; and when the proportion of dead nodes is smaller than the preset proportion value of the dead nodes, calculating the proportion of immune nodes in the neighbor nodes of the susceptible nodes and the time required for the node to be infected,determining whether the infected node is converted into an immune node and a dead node, and evaluating and outputting the obtained fault size of nodes in the power grid. According to the method and apparatus disclosed by the present invention, the risk range in the power system can be accurately obtained, and the attacked node can be timely remediated, so that the information security of the powergrid system can be better ensured.

Provided is a system and method for placing trade orders on an electronic exchange using a client terminal. The client terminal includes a user input device and a display device. The method includes displaying a spread matrix on a trading screen of the display device, the spread matrix displaying at least two base dartboards and at least one compound dartboard. The method also includes displaying a market depth of a first tradable instrument on the first base dartboard, displaying a market depth of a second tradable instrument on the second base dartboard, and displaying on the compound dartboard a dynamic display of a plurality of prices of a market depth of a compound. The compound represents a spread market of the first and second tradable instruments. The method further includes displaying a selected-price display on the compound dartboard, the selected-price display displaying a selected price of the plurality of prices in response to detecting a first user action via the user input device, and placing a trade order for the compound at the selected order price on an exchange host system in response to detecting a second user action via the user input device.

The invention discloses a method of solving the inverse matrix of an electromagnetic wave propagation matrix based on antenna pattern information of a wireless terminal. A microwave anechoic chamber comprises n test antennas inside, a wireless terminal comprises m receiving antennas, and the m receiving antennas and selected m test antennas carry out data transmission in the form of electromagnetic wave, wherein m>=2, and n>=m. The method of solving the inverse matrix of an electromagnetic wave propagation matrix comprises the following steps: getting the pattern information of the m receiving antennas; calculating out coordinate points suitable for solving the inverse matrix of an electromagnetic wave propagation matrix according to the pattern information; and solving the inverse matrix of a corresponding propagation matrix at the suitable coordinate points. Through the solving method, an inverse matrix meeting requirements can be solved quickly during calculation based on a radiation two-step approach (one of the international standards for MIMO test), no human intervention is needed, and time and effort are saved.

A rare earth ion ultrashort laser source includes a resonant cavity having a first output face partially reflecting and a second reflecting face. The source also includes a first active material, which receives a pump luminous flux transmitted via a first solid laser pump source. The resonant cavity exhibits a length of optical path travelled by the pulses greater than 7.5 m so that the pulsed energy EL is greater than 100 nJ, the optical path including at least one passage in the active material and the ultrashort laser source includes elements for lengthening the resonant cavity thereby enabling to extend the length of the optical path travelled by the luminous pulses in the resonant cavity, the ABCD propagation matrix of the resonant cavity being close to the unit matrix so that the features of the luminous beam going back and forth in the resonant cavity remain unchanged.

The invention discloses a seismic response simulation method based on a VTI anisotropic propagation matrix. The method comprises steps that VTI medium elastic parameters are obtained through rock physical modeling according to logging data; a frequency-varying reflection coefficient Rf of corresponding reflection waves is calculated according to the generalized propagation matrix theory of an inelastic thin interbed reflection coefficient; an amplitude spectrum Uf of the corresponding reflection waves is solved according to the frequency-varying reflection coefficient Rf; inverse Fourier transform of the Uf is performed to obtain a reflection wave waveform ut. Compared with a seismic synthetic record obtained by a conventional convolution model, the seismic synthetic record obtained by themethod is advantaged in that waveform description precision is improved.

The invention provides an MIMO wireless terminal test-based signal generation method and device. Phase offset transform is performed on a calibration matrix so as to obtain multiple spatial propagation matrixes of an MIMO test system, then a target spatial propagation matrix with isolation degree meeting a preset condition is selected according to a maximum amplitude of each element in an inversematrix of the spatial propagation matrix, and finally, according to the target calibration matrix before phase offset transform of the target spatial propagation matrix, a pre-calculated throughput test signal is calculated, and an emit signal for tests is generated. The target spatial propagation matrix with isolation degree meeting a preset condition can be selected through an algorithm only, sothat the signal generation efficiency is improved, particularly, calculation speed is improved in a high-order spatial propagation matrix, and a radiation two-step test is intelligent, automatic andoptimized.

Enhancement of wireless Channel Order and rank (ECHO) systems and ECHO repeater devices for enhancement of a wireless propagation channel for point to point or point to multipoint radio configurations are disclosed. The enhancement may be used for MIMO communications channels. Aspects support a richer multipath environment to increase the rank of the channel propagation matrix and / or to increase the magnitude of the coefficients of the propagation matrix between two or more radios. Such enhancement is applicable to backhaul radios in terms of increased range or in the number of supportable information streams. The installation, provisioning, optimization, control, monitoring, and adaptation of such devices within a network of backhaul radios is also disclosed. Wireless links and control between IBR and ECHO devices, and between ECHO devices and other ECHO devices, are also disclosed.

The invention discloses a reflection acoustic logging wave field separation method and device. The method comprises the steps: carrying out the preprocessing of an actual measurement waveform, and calculating the slowness range of a direct wave in the actual measurement waveform after preprocessing; constructing a propagation matrix according to the calculated slowness range; obtaining the waveform of the direct wave through inversion according to the propagation matrix and the actual measurement waveform after preprocessing; removing the waveform, obtained through inversion, of the direct wave from the actual measurement waveform after preprocessing, obtaining a reflection waveform, carrying out the migration imaging of the reflection waveform, and obtaining a final reflection waveform. The device comprises a calculation module, a constructing module, an inversion module, and a migration module. The method solves a more accurate propagation matrix through a slowness time coherence method, gives consideration to a plurality of array types of the direct wave based on a frequency dispersion effect, can stably and effectively extract the reflection wave from the actual measurement wave, and provides more accurate and effective information for the reflection acoustic logging.

The present invention is suitable for the technical field of information processing, and provides a bogus news identification method and device. The method comprises the steps of: obtaining a plurality of carrier texts comprising target news, and propagation paths of the carrier texts; based on the carrier texts and identifiers of propagation users, obtaining the text matrixes of the carrier texts; introducing the text matrixes into a preset feature vector calculation model to obtain the text feature vector of the target news; according to the propagation paths of all the carrier texts, generating a user propagation matrix about the target news; introducing the user propagation matrix into a preset user feature calculation model to obtain a user propagation feature vector corresponding tothe target news; calculating a true and false index of the target news according to the user propagation feature vector and the text feature vector; and if the true and false index is in a preset trueand false index range, identifying that the target news is bogus news. The bogus news identification method and device do not need human investigation and evidence obtaining so as to reduce the humancost and the investigation time and improve the identification accuracy o the bogus news.

The invention discloses a propagation characteristic-based short-circuit voltage sag characteristic quantity calculation method of a power distribution network. The propagation characteristic-based short-circuit voltage sag characteristic quantity calculation method comprises the steps of acquiring a parameter of the power distribution network, calculating a steady-state power flow of the power distribution network to obtain a steady-state voltage of each node of the power distribution network, and calculating load equivalent impedance; forming a conversion matrix of a transformer according toa transformer parameter, correcting equivalent impedance among nodes, and building a propagation matrix of voltage sag passing through the power distribution line; considering a power supply-fault point connection line as a fault feeder, considering other feeders as non-fault feeders, building a voltage slag characteristic equation of the fault feeder, and building a voltage sag propagation characteristic equation from a fault source to a load end by combining the transformer and a line propagation matrix; and calculating voltage sag characteristic quantity distribution in the power distribution network under different fault types according to the voltage sag propagation characteristic equation. A parameter of the power distribution network and the structure characteristics thereof can beutilized, the voltage sag distribution characteristic is analyzed, the method is simple and effective, and engineering application is easy.

The invention relates to a propagation matrix modulus optimization fitting method and system based on a differential evolution algorithm. The propagation matrix modulus optimization fitting method comprises the steps of: determining target fitting precision tol and a fitting frequency range; determining a pole number range; determining the range of the delay [tau]; determining the maximum value ofa delay coding vector based on the range of the delay [tau]; determining the maximum value of a pole number encoding vector based on the range of the pole number; determining the number of solutionsto be N; initializing related parameters in an iteration process; performing iterative computation based on the related parameters; reading the solution x* with the minimum [delta] in the group to obtain the number and delay of poles contained in the solution x*, and executing the above steps to obtain a new pole; and fitting the modulus of the propagation function matrix by using a vector fittingtechnology according to the pole number, the time delay and the new pole obtained in the previous step, calculating a fitting error, and outputting a fitting result and the fitting error. According to the method, the differential evolution algorithm is introduced, the nonlinear optimization problem can be well solved, and the efficiency is improved.

The invention relates to a seismic response simulation method for a heterogeneous hydrate reservoir. The method comprises the steps that the content, elasticity modulus and density of various mineralcomponents in a matrix framework, the elasticity modulus and density of hydrate, the elasticity modulus and density of formation water and reservoir porosity are obtained; establishing a non-uniform model of vertical change of hydrate stratum saturation and transverse change of stratum thickness, and obtaining a change rule of speed and attenuation of the sandstone stratum containing the natural gas hydrate along with frequency by utilizing the BISQ model; calculating the velocity dispersion characteristics of the underlying free gas stratum of the hydrate-containing stratum by using a White spotted saturation model; and based on a propagation matrix theory, calculating reflection waveforms of the heterogeneous hydrate stratum and the free gas stratum. The method comprises the following steps: establishing a non-uniform model of hydrate stratum saturation vertical change and stratum thickness transverse change; and calculating the seismic reflection waveform response of the non-uniformhydrate stratum through a rock physical model and a seismic simulation method based on a propagation matrix theory.

The invention discloses a method and a system for inhibiting a residue pole ratio in an overhead line frequency domain propagation matrix vector fitting process. The method comprises the following steps: for each element, when a corresponding initial residue pole ratio is greater than a first preset threshold, performing singular value decomposition on a coefficient matrix, and setting a singularvalue of a product of a maximum singular value in a first singular value matrix and a preset precision threshold to be zero to obtain a second singular value matrix; determining an updated coefficientmatrix by using the second singular value matrix, and determining a new residue vector by using a least square method; removing a pole with a value of 0; judging whether the ratio of the residue corresponding to each of the remaining poles to the pole is smaller than a first preset threshold value or not; if so, indicating that the suppression is successful, and determining a frequency domain propagation matrix for expressing each element in a rational mode by utilizing the residual poles and the corresponding residues so as to ensure the stability of time domain simulation; otherwise, indicating that the suppression fails, and carrying out recalculating.

The invention discloses a protein function prediction method based on network propagation, and the method comprises the following steps: building an undirected weighted network according to a proteininteraction network topological structure, and enabling the undirected weighted network to be represented as an undirected graph adjacency matrix M; performing calculating to obtain an initial propagation distance matrix MI according to the protein structural domain information and the protein compound information; iteratively calculating a network propagation distance between proteins according to the undirected graph adjacency matrix M and the initial propagation distance matrix MI to obtain a network propagation matrix MP; gradually adding adjacent nodes of the test protein according to thenetwork propagation matrix MP to form function modules, and forming a candidate function list by a plurality of function modules; scoring and sorting the candidate functions in the candidate functionlist, and selecting a plurality of function annotation test proteins with the top rank. According to the method, the fusion mode of multi-source biological data in protein function prediction methodresearch is improved, the negative influence of false positive and false negative in the interaction network on prediction is reduced, and the accuracy of protein function prediction is greatly improved.

The invention relates to a reliability evaluation method of a migration velocity field. The method includes the steps of 1) performing continuation of a wave field from ground to underground through a seismic wave propagation operator; 2) performing imaging for the continued wave field through an imaging operator; 3) performing approximate processing on a propagation matrix so that the propagation matrix can retain primary information of a velocity field; 4) calculating the topological scale of the propagation matrix after the approximate processing and describing the internal structure of a migration velocity field through the topological scale; and 5) calculating migration velocity fields at different resolution scales, and repeating the steps 1) to 4) for different migration velocity fields to obtain a topological scale curve of each migration velocity field, with the proximity of the topological scale curve of the different migration velocity field representing the proximity of a migration result.

The invention discloses a method for extracting reflection transverse waves from dipole transverse wave data and relates to the technical field of array sound wave logging information treatment and application. The method includes steps of 1, performing waveform restoration on dipole transverse waves; 2, performing band-pass filtering on the transverse wave data; 3, performing time slowness analysis on the transverse wave data and acquiring transverse wave change range in different depths; 4, establishing a transverse wave data propagation matrix; 5, solving reflection transverse wave data. According to the invention, dipole transverse wave information and instrument structure information are combined for comprehensive analysis, multiple direct wave speeds are adopted for filtering treatment in stratums having severe transverse wave dispersion, so that direct wave removal incompleteness caused by single-speed filtering is avoided.

The invention discloses a sandstone-mudstone thin interbed prediction method and system based on seismic waveform inversion. The method can comprise the steps: determining sandstone speed, sandstone density, mudstone speed and mudstone density according to logging interpretation data, and then, establishing a plurality of kinds of sandstone and mudstone combination modes; calculating frequency-varying AVO response on the full frequency band of all sandstone and mudstone combination modes through a propagation matrix method; calculating a correlation value of the actual seismic data and the AVOresponse of all sandstone and mudstone combination modes to obtain a final key parameter; according to the final key parameter, determining a final sandstone and mudstone combination mode; and inverting the seismic data layer by layer and channel by channel according to the final sandstone and mudstone combination mode to obtain an inversion result of the whole seismic section. According to the method, inversion is carried out through a well-constraint-free method, the influence of well constraint is small, an inversion result has a reference value for sand layer combination, space distribution prediction and the like, and a basis can be provided for distinguishing the reservoir quality from the aspect of a sand layer structure in prediction of a favorable reservoir.

The invention discloses a radio frequency performance testing method and device for wireless equipment and a tester, and the method comprises: collecting the power return information of a tested piece; obtaining a propagation matrix according to the power return information, and obtaining a loaded inverse matrix according to the propagation matrix so as to form a virtual wire between an instrumentoutput port and a receiver port of the tested piece; and according to the throughput rate test signal, carrying out transmission through the virtual wire so as to carry out performance test on the tested piece and generate a radio frequency performance test result. According to the method, the virtual wire can be solved according to the power return information, the test efficiency is improved while the test accuracy is improved, and the test applicability is improved.

The invention discloses a method for remedying heavy metals with an earthworm microcosm system. A plant-mycorrhiza-earthworm microecosystem is constructed, plants which are easily infected with mycorrhizae are selected according to main varieties in the area where the plants are located, strains are Glomus versiforme, an inoculant is a sand mixture containing host plant root sections, mycorrhiza fungal spores and external hyphae and takes sand as a propagation matrix, and propagules are obtained after 10 weeks of propagation with a maize and clover potting method and contain VA mycorrhiza hyphae, spores and root sections. Inoculation is performed in a local inoculation manner, the inoculation amount is 5%, Eisenia foetida is obtained from a local earthworm farm, and the properties of soil of land where the earthworms are collected are similar to experimental soil. Through the design of the plant-mycorrhiza-earthworm microecosystem and the technology of in-situ planting, construction soil heavy metal in-situ passivation and fixed-point remediation, the purpose of remedying heavy metal pollution of farmland soil is finally achieved, and a multifunctional soil conditioner is developed.

An apparatus for estimating attitude using an inertia measuring apparatus comprising: a Kalman filter 3 adapted to receive a quantity of state ω(t) from the inertia measuring apparatus 1, input the quantity of state into a predetermined system equation and a predetermined observation equation and execute time update processing and observation update processing with regard to the system equation and the observation equation; a processing section 4 adapted to generate an estimated value of a time differentiation of a modified Rodrigues parameter α(t) based upon an output of the Kalman filter; an integral processing section 5 adapted to generate an estimated value of the modified Rodrigues parameter based upon an output of the processing section; a system propagation matrix generating section 6 adapted to update an observation sensitivity matrix based upon an initial value being given beforehand and an output of the integral processing section and supply the updated output to the Kalman filter; a transformed matrix generating section 7 adapted to generate a coordinate transformation matrix R based upon an output of the integral processing section; and an attitude estimation section 8 adapted to carry out an attitude estimation based upon an output of the transformed matrix generating section, is disclosed.

The present invention is a method and system for receiving data transmitted using block space time transmit diversity (BSTTD) in a code division multiple access (CDMA) communication system. The system comprises a transmitter, for transmitting a first data field using a first antenna and a second data field using a second antenna, and a receiver. The receiver includes an antenna for receiving the first and second transmitted data fields, and a BSTTD joint detector which determines symbols of the first and second transmitted data fields using a minimum mean square error block linear equalizer model and an approximated Cholesky decomposition of the model. The receiver is simplified by the use of block banded propagation matrices.

The invention relates to a propagation matrix modulus optimization fitting method and system based on a particle swarm algorithm. The method comprises the steps of determining the target fitting precision tol, the fitting frequency range, the pole number range and the delay tau range; generating N random numbers in the fixed interval; determining a real pole number point mi and a delay point tau i, and rounding down the real pole number point mi; initializing related parameters in an iteration process; performing iterative computation based on the related parameters; reading the historical optimal position vector of the group to obtain the number and delay of contained poles, and executing the previous step to obtain new poles; and fitting the modulus of the propagation function matrix byusing a vector fitting technology according to the obtained pole number, time delay and new poles, calculating a fitting error, and outputting a fitting result and the fitting error. According to thesystem, the model parameters meeting the precision requirement can be quickly found, and the corresponding fitting model is obtained.

The invention relates to the field of transient response analysis of porous elastic media, in particular to a thermal fluid-solid coupling transient response calculation method and device for a porouselastic medium. The method comprises the following steps: acquiring relevant parameters of the porous elastic medium; establishing a thermal fluid-solid coupling form of the porous elastic medium according to the relevant parameters of the porous elastic medium; constructing a form of a single-layer porous elastic medium solution on a Laplace domain or a form of a solution on any layer of a multi-layer porous elastic medium based on an eigenvalue theory and a Stroh-like method; obtaining a general solution of each physical quantity Laplace domain of the porous elastic medium based on a propagation matrix method, and determining a special solution of each physical quantity Laplace domain according to boundary conditions; and obtaining the thermal fluid-solid coupling transient response ofthe porous elastic medium based on a Laplace numerical inverse transformation method. The thermal-fluid-solid coupling transient response of the elastic medium is solved by adopting an analytical method, so that the calculation amount can be reduced, and the calculation speed can be increased.