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104 results about "Recursion method" patented technology

Automotive adaptive cruise control method taking multiple targets into consideration

The invention discloses an automotive adaptive cruise control method taking multiple targets into consideration. A layer control strategy is utilized, upper layer control can decide an expected longitudinal acceleration according to a target vehicle and a current state of a controlled vehicle, and lower layer control can track the expected longitudinal acceleration through a reverse recursion method. The automotive adaptive cruise control method comprises the following steps: a mutual longitudinal dynamitic model between two vehicles is established, a design model predicating controller can obtain the expected distance between two vehicles according to a constant time headway strategy, a model prediction control algorithm is utilized to decide an expected longitudinal acceleration for tracking the expected distance between the two vehicles, vehicle control work conditions are divided into a driving work condition and a braking work condition, reverse longitudinal dynamic models for the two work conditions are established respectively according to a vehicle driving equation, an expected throttle percentage is obtained according to the vehicle reverse longitudinal dynamic model and the expected acceleration in the driving work condition, and an expected brake pedal openness is obtained according to the expected acceleration in the braking work condition.
Owner:JILIN UNIV

Recursive method and system for accessing classification information

A web based menu system that allows the users such as buyers and sellers to locate, purchase, and sell goods, items and services easily without any search queries. The knowledge base of the system increases with user interaction at variable levels. The database contains an orderly classification of goods and services throughout. Point-and-click technology can be used to navigate through a series of menus. The system can also respond to voice activation and recognition commands. At the web site, the user first selects a category followed by a selection of makes, items, or services called a Sub-Category that relate to the category. The system responds by displaying a uniform series of menus referred to as a "Fluidity of Taxonomy". This process repeats until the user reaches the finite end of the menu series. Next, the system completes the interaction based upon if the user is a buyer or a seller. For buyers, the database is accessed resulting in a list of ads based upon the user's accumulated menu selections. The user can filter and sort the presentation of ads based on various criteria and place requests for instant notification of subsequent new ad placements. Banner ads that are applicable to the buyers' area of interest are also presented by the system. For sellers, an input form for ad placement is presented based upon the user's accumulated menu selections. Sellers can also grow the database based on their menu selections and form input. The system can be used for retreiving any orderly classification of information.
Owner:ROBB ANNE E

Method for correcting stray radiation in an x-ray computed tomography scanner

In a method for correcting for stray radiation in measured intensity values, the measured intensity values are obtained in an X-ray computed tomography scanner by means of a detector matrix that is situated in a tomography measuring field of the computer tomography scanner and has a multiplicity of detector elements arranged next to one another in a number of adjacent detector rows. At least one reference distribution of the stray radiation intensity is determined in the row direction of the detector matrix, and a stray radiation component of each measured value of intensity is determined starting from this at least one reference distribution, and the measured intensity values are corrected as a function of their respective stray radiation component. In this case, the stray radiation component of the measured values of intensity of at least a fraction of the detector rows is determined by using a recursion method on the basis of the reference distribution.
Owner:SIEMENS HEALTHCARE GMBH

Maximum likelihood sequence estimator which computes branch metrics in real time

InactiveUS7277506B1Lower requirementImprove MLSE accuracyAmplitude-modulated carrier systemsAmplitude demodulationParallel computingMaximum likelihood sequence estimator
An improved method and apparatus for Viterbi Algorithm calculations for maximum likelihood sequence estimators in communication receivers is disclosed. The calculations for the maximum likelihood sequence estimator, in accordance with the invention, utilizes a variant of the Viterbi algorithm developed by Ungerboeck in which the associated branch metric calculations for the trellis require the computation of a set of branch metric parameters. An embodiment of the present invention provides for an improved recursive method and apparatus for calculation of the branch metric parameters that reduces the number of processor clock cycles required per state metric calculation. This enables real time computation of the branch metric parameters during execution of the Viterbi Algorithm.
Owner:AVAGO TECH INT SALES PTE LTD

Isolated forest-based binary classification abnormal point detection method and information data processing terminal

The invention belongs to the technical field of communication control and communication processing, and discloses an isolated forest-based binary classification abnormal point detection method and aninformation data processing terminal. The method comprises the steps of carrying out initial static average blocking on an original data set, and calculating the density in the block and the mean density; after calculating the density in each block of the static block, reducing the data set by taking the mean density of the original data set as a threshold value; constructing an isolated forest byusing a node recursion method; performing corresponding feature extraction and datamation on the original data set, and calculating the spatial position distances between the clustering center pointand other points; adding the abnormal score calculated on the basis of the density and the distance and the abnormal score calculated on the basis of the proof information and comparing with a corresponding threshold value. According to the method, the accuracy of an abnormal point detection algorithm is effectively improved, the actual data size in the abnormal detection process can be greatly reduced, the calculation resources are saved, and the abnormal detection efficiency is improved, and the robustness of an abnormal detection algorithm is enhanced.
Owner:CHENGDU UNIV OF INFORMATION TECH

Recursive method and system for accessing classification information

A web based menu system that allows the users such as buyers and sellers to locate, purchase, and sell goods, items and services easily without any search queries. The knowledge base of the system increases with user interaction at variable levels. The database contains an orderly classification of goods and services throughout. Point-and-click technology can be used to navigate through a series of menus. The system can also respond to voice activation and recognition commands. At the web site, the user first selects a category followed by a selection of makes, items, or services called a Sub-Category that relate to the category. The system responds by displaying a uniform series of menus referred to as a “Fluidity of Taxonomy”. This process repeats until the user reaches the finite end of the menu series. Next, the system completes the interaction based upon if the user is a buyer or a seller. For buyers, the database is accessed resulting in a list of ads based upon the user's accumulated menu selections. The user can filter and sort the presentation of ads based on various criteria and place requests for instant notification of subsequent new ad placements. Banner ads that are applicable to the buyers' area of interest are also presented by the system. For sellers, an input form for ad placement is presented based upon the user's accumulated menu selections. Sellers can also grow the database based on their menu selections and form input. The system can be used for retreiving any orderly classification of information.
Owner:ROBB ANNE E

Ballistic trajectory forming method based on output correlation adaptive Kalman filter

The invention discloses a ballistic trajectory forming method based on output correlation adaptive Kalman filter. During the ballistic trajectory forming process, an output correlation functional matrix is estimated by the utilization of bullet flying parameters, and the optimal steady-state solution of Kalman filter gain matrix is calculated by the correlation functional matrix so as to make the steady-state gain fit in with an actual observed value; and the correlation functional matrix is continuously adjusted according to the observed value by a recursion method, and adaptive filtering estimation and correction of trajectory data are realized so as to obtain accurate ballistic trajectory. According to the invention, the filter divergence problem caused by factors such as incomplete consistency between a trajectory attribute model and an actual physical model, inaccurate system noise and observation noise parameter estimation and the like is inhibited effectively, and filtering accuracy and accuracy of the ballistic trajectory are raised.
Owner:HOHAI UNIV

Semantic entity relation extraction method and device, and electronic equipment

The invention provides a semantic entity relation extraction method and device, and electronic equipment. The method relates to the fields of artificial intelligence and information extraction technology of natural language processing. The method comprises: identifying each word node of an input text; constructing a dependency characteristic of each word node; and when more than two word nodes arein a coordinating relation, extracting relational triples of candidate nodes by recursively calling pre-stored semantic rules; wherein the pre-stored semantic rules comprise a pre-modification structure rule and a verb-related rule. Compared with the prior art, the method and the device avoid extraction omission due to complicated rules and incomplete definitions by using a recursive method, andcan improve the accuracy of entity relation extraction.
Owner:广东蔚海数问大数据科技有限公司

Judgment method for voltage level of high power accessing power grid

The invention discloses a judgment method for the voltage level of a high power accessing power grid. The judgment method comprises the steps of constructing a target hierarchical structure; constructing a judgment matrix and a calculation target weight by an expert experience method; then calculating respective anti-entropy weight values of ten indexes under three target layers by an anti-entropy method, and obtaining a total weight by a hierarchical recursion method to obtain a reliable voltage level judgment result. Due to the combination of subjective and objective weighting methods, the stability and the objectiveness of a voltage level evaluation result are guaranteed when high power is accessed into a power grid.
Owner:STATE GRID CORP OF CHINA +2

Milk somatic cell counting method based on computer vision

Disclosed is a milk somatic cell counting method based on the computer vision. The method comprises the steps of dropping a coloring agent into milk, coloring somatic cells with the coloring agent, dropping the milk into a slide, and acquiring cell images by using a digital microscope, wherein the cell images are color images; preprocessing the cell images; and performing the cell image counting process: setting the somatic cell occupied pixel area range S1-S2; scanning cell binaryzation images progressively, and probing the size S of a communication area where the pixel is positioned by using a recursion method if a white pixel is found, wherein, the communication area to which the white pixel belongs is somatic cells if S1<=S<=S2, 1 is added to the somatic cell number count; otherwise, the somatic cell number count does not change; and obtaining the somatic cell number count in the cell images. According to the milk somatic cell counting method based on the computer vision, human factor influences are avoided effectively, the detection efficiency is high and the accuracy is good.
Owner:ZHEJIANG UNIV OF TECH +2

Selective latent semantic indexing method for information retrieval applications

A term-by-document (or part-by-collection) matrix can be used to index documents (or collections) for information retrieval applications. Reducing the rank of the indexing matrix can further reduce the complexity of information retrieval. A method for index matrix rank reduction can involve computing a singular value decomposition and then retaining singular values based on the singular values corresponding to singular values of multiple topics. The expected singular values corresponding to a topic can be determined using the roots of a specially formed characteristic polynomial. The coefficients of the special characteristic polynomial can be based on computing the determinants of a Gram matrix of term (or part) probabilities, a method of recursion, or a method of recursion further weighted by the probability of document (or collection) lengths.
Owner:SELECTIVE

Autonomous control method for GEO (Geosynchronous) orbit satellite by using angle information only

The invention provides an autonomous control method for a GEO (Geosynchronous) orbit satellite by using angle information only. The method comprises the steps of correcting the orbit deviation of a star sensor and an infrared earth sensor; calculating the projection of a geocentric unit vector in an inertial equatorial coordinate system; calculating longitude and latitude deviation between the current satellite and an ideal fixed point, and using a result as a filter observed quantity; using a C_W equation as a system equation and estimating the right ascension and the declination of the satellite by using a Kalman recursion method; determining the reference coordinate system of the current attitude control of the satellite by using the result; calculating the attitude deviation of the satellite by using the information of the star sensor again and using the attitude deviation as system control input; and repeating the steps to realize the autonomous continuous navigation and the autonomous attitude control of the satellite. By conducting the autonomous on-star resolution and the autonomous attitude control of the position of a spacecraft through on-star sensor observation only, the problems that a measurement and control network cannot be globally distributed and the measurement and control cost is high are solved, the autonomous running of the satellite is realized and the survivability of the satellite is improved.
Owner:SHANGHAI XINYUE METER FACTORY

Multi-controller optimal state estimation control strategy design method based on Kalman filtering

The invention discloses a multi-controller optimal state estimation control strategy design method based on Kalman filtering, and the method comprises the steps: firstly carrying out the system modeling of a wireless networking control system, and analyzing the impact on the closed-loop control of the system when there is network transmission time delay in the wireless networking control system; secondly carrying out the research of the information fusion of distributed controllers, and constructing a network control optimization problem based on double distributed controllers; finally carrying out the Kalman filtering analysis of the platform state information received by the two controllers through employing a Kalman filtering algorithm, solving an optimal state estimation control strategy through an iteration regression method, and verifying the feasibility through a simulation experiment. The method solves a problem of an optimal state estimation control strategy of the distributedcontrollers when there is the transmission time delay in a wireless communication network and the accurate platform state information cannot be obtained because of the noise interference, thereby achieving a purpose of improving the stability of the networking control system and reducing the system loss through the cooperative control of the distributed controllers.
Owner:BEIJING UNIV OF TECH

Coordinated control method for wind power plant of double-fed fan to participate in one-time frequency modulation of power system

The present invention relates to a coordinated control method for the wind power plant of a double-fed fan to participate in the one-time frequency modulation of a power system and belongs to the operation and control technical field of the power system. The method comprises the steps of establishing energy status evaluation indexes and power generation level evaluation indexes for fans; setting a communication coefficient matrix between fans; measuring the frequency of the coordination layer of the wind power plant and generating the reference value of the output power of the wind power plant; exchanging power generation level evaluation indexes between adjacent fans, conducting the Newton iteration through the outer loop iteration method, and tracking a reference value generated by the coordination layer; during each iteration step, calculating the approximate Newton direction of the step by each fan through the inner loop recursion method. In this way, the necessary information is provided for the outer loop iteration operation. According to the technical scheme of the invention, the stored kinetic energy of a double-fed fan can be fully utilized, and a coordinated control system is designed to reduce the computational burden of the coordination layer. Meanwhile, based on the second-order convergence of the distributed Newton method, the rapid primary frequency modulation of the overall wind power plant is realized. At the same time, the power can be reasonably distributed among fans, so that the safe operation of the fans is ensured.
Owner:TSINGHUA UNIV

Application interface including dynamic transform definitions

An application programming interface configured to transform data responsive to a transform process definition. The transform process definition is interpreted concurrently with the transformation process. This interpretation dynamically determines navigation within, and processing of, the data to be transformed. Under control of the transform process definition, a transform engine is configured to transform input data using recursive calls to a transformation process. The recursive approach is responsive to data structures within the transform process definition and simplifies operations such as parallel processing, load-balancing of transformation tasks, nesting, un-nesting, filtering, and the like.
Owner:ORACLE INT CORP

Method and apparatus for combine selecting transmitting and receiving antennas

The invention relates to a combined selecting method and apparatus of transmitting and receiving antenna in wireless communication technique. The method comprises the steps that: step 1: a transmitting end transmits a training sequence, a receiving end carries out the channel estimate based on the received training sequence to obtain the MIMO channel transfers matrix; step 2: the receiving end uses a forward-inverse direction recursive method to perform the combined selecting of transmitting and receiving antenna; and step 3: the receiving end feeds back the transmitting antenna sequence number to the transmitting end by the mapping feedback or direct feedback. The apparatus includes a channel estimate unit, a transmitting and receiving antenna combined selecting unit, a feedback unit, which are used to perform the processes of the steps. The performance of the invention can approach to the high limit of the antenna selecting MIMO system, remarkably reduce the computing complexity as well as ensure the near-optimized channel capacity of the system, and has high application in MIMO system which has higher request of real time processing.
Owner:SHANGHAI JIAO TONG UNIV +1

Parameter design method of direct current side main loop of flexible direct current system containing superconducting direct current limiter

The invention discloses a parameter design method of a direct current side main loop of a flexible direct current system containing a superconducting direct current limiter, which comprises the following steps of: (1) determining a short circuit current peak value, a lightning arrester branch access moment and a most severe working condition; (2) calculating the relationship between the smoothingreactance and the short circuit current peak value; (3) solving the magnitude of the smoothing reactance; (4) solving the magnitude of the current limiting resistor. The parameter design method of thedirect current side main loop can fill the blank of the design research of the direct current main loop containing the superconducting current limiter and can play a certain guiding role for the design of the future engineering; the calculation formula of the short circuit current based on the recursion method can improve the calculation efficiency, avoid the time-consuming time domain simulationcalculation and reduce the time spent by the design of the direct current main loop under the premise of ensuring the effectiveness.
Owner:NANJING ELECTRIC POWER ENG DESIGN +3

Single channel optimum constant-mould interference rejection method and system in civil aviation air-ground communication

A single-channel optimum method and system for constraining constant modulus interference in the process of civil aviation ground-air communication comprises that very high frequency amplitude-modulated signal received by the antenna is converted into intermediate frequency signal; the converted intermediate frequency signal is implemented with the process of digital conversion and filtration extraction; the carrier frequency of the signal after the process of filtration extraction is estimated; and then the process of adaptive notch filtering is implemented; the signal, the amplitude modulation and carrier wave of which are removed, is implemented with the process of orthogonal transform; the signal after the process of orthogonal transform utilizes non-linear least squares to estimate the constant modulus interference signal; the signal after the process of orthogonal transform and the estimated constant modulus interference signals are delivered into a subtracter together and then the two signals are subtracted; the resistive component of the subtracted signal is taken to be multiplied with the carrier wave signal for modulation; and then the high-frequency clutter is removed through a low-pass filter and the audio frequency signal is output. The single-channel optimum method for constraining the constant modulus interference can estimate the modulation and the phase of theconstant modulus interference in real time and avoid the convergence problem of the ordinary adaptive interference constrain method; two methods of batch processing and recursion are presented and the convergence property of the recursion method is proven.
Owner:CIVIL AVIATION UNIV OF CHINA

Self-adaptive trace tracking control method of uncertain wheel type mobile robot

The invention discloses a self-adaptive trace tracking control method of an uncertain wheel type mobile robot. The self-adaptive trace tracking control method comprises the following steps: S1, establishing a kinetic equation of a system model module of the wheel type mobile robot; S2, aiming at unknown parameters of a robot system, adopting an integral inversion strategy to design a model of a control input module established based on a Lyapunov stability theory through a Lyapunov function recursion method. The self-adaptive trace tracking control method of the uncertain wheel type mobile robot, disclosed by the invention, has the advantages that influences of system parameter perturbation can be compensated relatively well, and the trace tracking performance and robustness of the mobilerobot are improved. Under conditions that part of parameters of a system are unknown and a boundary of external perturbation is unknown, the control precision is improved and the trace tracking performance and robustness of the mobile robot are ensured; the self-adaptive trace tracking control method has relatively good actual application value and social significance.
Owner:HEFEI UNIV OF TECH

Double recurrence equilibrium realizing method for combined detection

The method includes modified Cholesky decomposition, which decomposes system correlation matrix R into product of unit of lower triangular matrix, diagonal matrix and unit of upper triangular matrix. The method omits radication operation in traditional Cholesky decomposition, and reduces quantity of division operation greatly so as to be implemented by hardware. Based on features of matrix obtained by Cholesky decomposition, new double recursive algorithm is adopted. Thus, matrix recursion and recursion method for solving unit triangular coefficient matrix equation set prevents operation from solving matrix inversion. Advantages are: reducing complexity of software, easy of realizing reuse of storage space for recursion operation, saving power consumption and storage space of handset as much as possible so as to suit hardware implementation.
Owner:RDA CHONGQING MICROELECTRONICS TECH CO LTD

Grid grading method for near-surface ground motion simulation

The invention relates to a grid grading method for near-surface ground motion simulation, and belongs to the field of engineering wave theory and seismology. The method comprises the following steps: firstly, a block to be researched is established, and a dynamic balance equation of the block to be researchedis established; secondly, the stress and displacement on the contour of the block to be researched are calculated; finally, by a recursive method, the stress field, displacement field and accelerated speed field of the block to be researched at the connecting part of a thick grid and a thin grid are calculated from time t to time t + <delta>t, and a speed field is calculated from time t - <delta>t / 2 to time t + <delta> t / 2. According to the method, an irregular grid with different steps can be adopted to disperse a calculation model, and the simulation process is efficient and flexible, and the calculation efficiency can be improved greatly.
Owner:SHENYANG POLYTECHNIC UNIV

Adaptive filtering method used for NSHV tracking filtering and adaptive filtering system thereof

InactiveCN107621632AImprove filter stabilityImprove filter stability and tracking accuracyRadio wave reradiation/reflectionPattern recognitionAdaptive filter
The invention discloses an adaptive filtering method used for NSHV tracking filtering and an adaptive filtering system thereof. According to the method, a dynamical model (state transition equation) based on the unknown attack angle and a radar measurement model (measurement equation) are established; and a recursion method based on the suboptimal unbiased noise statistical estimator is acquired.The method is used for near space hypersonic boost-glide aircraft tracking so that the filtering stability and the tracking accuracy can be effectively enhanced, the rate average tracking accuracy canbe enhanced for 50% than that of the Sage-Husa adaptive method, the rate average tracking accuracy can be enhanced for 6.77% than that of the Sage-Husa adaptive method, and the geocentric distance tracking accuracy within 100m and speed tracking within 6m / s can meet the defense requirements of the near space hypersonic glide aircraft.
Owner:NO 63921 UNIT OF PLA

Hierarchical network analysis method for OODA ring

The invention discloses a hierarchical network analysis method for an OODA ring, and belongs to the field of equipment system network analysis. The method comprises the following steps: when a hierarchical system based on an OODA ring selects nodes to reconnaissance enemy nodes, preferentially selecting the nodes with lower cost according to the principle of optimal cost; if the fault model is notmet, considering the node on the upper layer, and adopting a recursion method until the strike node layer cannot meet the fault model; and at the moment, performing degradation processing, analysis continues to be considered layer by layer, and calculating the cost needed for reconnaissance of enemy nodes. The system composed of the OODA ring is layered,, the detection nodes are selected under afault model. The accuracy of reconnaissance information is guaranteed and reconnaissance cost is minimum based on the principle of lowest cost. Finally cost required for reconnaissance of enemy nodesis calculated.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Emission wave beam nulling widening method based on orthogonal projection

The invention discloses an emission wave beam nulling widening method based on orthogonal projection, and relates to the digital array radar emission wave beam nulling widening technology. The method utilizes a reconstruction zero setting vector matrix, and data volume is reduced greatly. In addition, in order to avoid matrix inversion operation, a Gram-Schmidt orthogonalization (GSO) thought is introduced, and a recursion method is employed to carry out deducing of orthogonal complementary space. The provided method achieves emission wave beam nulling widening rapidly and flexibly under a condition that an emission wave beam pointing direction, a zero setting direction and a nulling width are known and the anti-interference performance of the system is enhanced.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Selective Latent Semantic Indexing Method for Information Retrieval Applications

A term-by-document (or part-by-collection) matrix can be used to index documents (or collections) for information retrieval applications. Reducing the rank of the indexing matrix can further reduce the complexity of information retrieval. A method for index matrix rank reduction can involve computing a singular value decomposition and then retaining singular values based on the singular values corresponding to singular values of multiple topics. The expected singular values corresponding to a topic can be determined using the roots of a specially formed characteristic polynomial. The coefficients of the special characteristic polynomial can be based on computing the determinants of a Gram matrix of term (or part) probabilities, a method of recursion, or a method of recursion further weighted by the probability of document (or collection) lengths.
Owner:SELECTIVE

Designing method for recursion integration terminal sliding mode surface of higher-order non-linear system

InactiveCN108710290AAvoid the singular value problemAdaptive controlMulti inputEngineering
The invention discloses a designing method for a recursion integration terminal sliding mode surface of a higher-order non-linear system. The method comprises steps of by use of the Lie derivative, arranging a general higher-order multi-input multi-output nonlinear system into a general high-relative degree non-linear system; designing a non-singular integration terminal sliding mode surface basedon a recursion method for the general high-relative degree non-linear system; and finally, based on the designed non-singular integration terminal sliding mode surface, giving out an exact time expression whose states are converged to the zero point. According to the invention, by introducing an integration equation, the integer orders and a recursion designing idea, a singular value problem in the design of the traditional terminal sliding mode is well avoided. A novel design idea is provided for terminal sliding mode control of the higher-order multi-input multi-output nonlinear system. Compared with the general limited time terminal sliding mode, by introducing high-power items, fixed time convergence is achieved, so dependence on system state values when a system track reaches the sliding mode surface is avoided.
Owner:YANSHAN UNIV

High-precision broadband measurement method for dielectric property of low-loss material

The invention provides a high-precision broadband measurement method for the dielectric property of a low-loss material. The high-precision broadband measurement method is applicable to a split type cylindrical resonant cavity. Two flange plates of the split type cylindrical resonant cavity form radial waveguides, the measured material is clamped between two half cavities to be measured in the modes of TE011, TE111, TE211, TE311, TE411, TE511, TE611, TE711, TE811 and TE911; all the measurement modes are identified through the constraint relation between the resonant frequencies of the measurement modes and dielectric constants on the basis of a recursion method, and the dielectric constants of the measured material at the resonant frequencies of the measurement modes are calculated. Meanwhile, material loss at the resonant frequencies of the measurement modes is calculated through the relation between quality factors of the measurement modes and material loss. In this way, the dielectric property of the low-loss material at multiple frequency points is obtained through measurement.
Owner:CHINA ELECTRONIS TECH INSTR CO LTD

Adaptable Clinical Workflow

Method of generating a number of steps constituting an adaptable clinical workflow based on a recursive approach in which for each step of the workflow the following steps are executed: Selecting a number of knowledge bases to be included in a reasoning step on the basis of (a) goal(s), generating (a) query(ies) taking into account the goal(s), applying the selected knowledge bases and the generated queries to a reasoning engine so as to generate a solution, interpreting this solution by translating the solution given in a formal representation into (an) executable action(s) for the current step in the clinical workflow.
Owner:AGFA HEALTHCARE NV

MMSE detection method for spread-spectrum OFDMA communication system

The invention provides an MMSE detection method for a spread-spectrum OFDMA communication system. The code spread factor of the spread-spectrum OFDMA communication system is Ns, and the payload is L, wherein L is more than or equal to half NS and less than or equal to Ns; and a code spread matrix with the size of Ns*L is formed by the first L columns of an original matrix w with the size of Ns*Ns. The method comprises the following steps of: a, performing OFDM demodulation and receiving to acquire a received symbol r; b, performing channel estimation, forming a diagonal matrix lambda h by Ns channel estimations, and estimating noise power sigma 2; c, calculating an MMSE detection operator BL when the payload is L, wherein the step c comprises the following substeps of: c.1, calculating an MMSE detection operator c when the payload is Ns; and c.2, recurring in turn according to a recursion rule to acquire a recursion rule: for given BL', first decomposing BL' in a way that QL' is a matrix composed of the first (L'-1) columns of the BL', and qL' is the last row of the BL'; and then calculating BL'-1, wherein WL' is the L' th column of w; and d, calculating a detection symbol y. The MMSE detection method adopts a recursion method, avoids direct matrix inversion, greatly reduces the calculation amount and reduces the power consumption of detecting hardware.
Owner:BEIJING XINWEI TELECOM TECH
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