74 results about "Shift matrix" patented technology

The invention provides a self-adaptive design method for an intelligent reflection phase shift matrix in a large-scale MIMO system. In a downlink, a base station transmits a signal through a large-scale antenna array, and an intelligent reflecting surface performs phase shift operation on the received signal and then reflects the received signal to a user. According to a corresponding communication environment, a phase shift matrix design method or a random phase shift matrix design method is adaptively selected and optimized. The phase shift matrix design is optimized by transmitting a single-frequency signal and optimizing the phase shift matrix of the intelligent reflecting surface under the criterion of maximizing the receiving power of the user side. The random phase shift matrix design randomly determines the phase of each reflective element. The method is easy to operate and low in calculation complexity, the two phase shift matrix design methods can obtain high power efficiency and spectrum efficiency, any channel state information of the intelligent reflecting surface is not needed, and the method has important significance for design and implementation of a large-scale MIMO communication system adopting the intelligent reflecting surface.

The invention discloses a precoding matrix and phase shift matrix optimization method in a bidirectional MIMO communication system, and relates to the field of wireless communication. Two source nodesassist in two-way communication through intelligent reflective surfaces. In order to maximize the system sum rate, a precoding matrix of a source node and a phase shift matrix of an intelligent reflecting surface are jointly optimized. The method comprises the steps of 1) establishing a system model; and 2) optimizing the source node precoding matrix and the intelligent reflecting surface phase shift matrix to maximize the sum rate. Aiming at the bidirectional MIMO communication system based on the intelligent reflecting surface assistance, the total transmission rate of the bidirectional communication system can be improved by jointly optimizing the source node precoding matrix and the intelligent reflecting surface phase shift matrix.

A method models a non-rigid three-dimensional object directly from a sequence of images. A shape of the object is represented as a matrix of 3D points, and a basis of possible deformations of the object is represented as a matrix of displacements of the 3D points. The matrices of 3D points and displacements forming a model of the object. Evidence for an optical flow is determined from image intensities in a local region near each 3D point. The evidence is factored into 3D rotation, translation, and deformation coefficients of the model to track the object in the video.

The present invention relates to a decoding method and a decoding apparatus in which, while the circuit scale is suppressed, the operating frequency can be suppressed within a sufficiently feasible range, and control of memory access can be performed easily, and to a program therefor. By using a transformation check matrix obtained by performing one of or both a row permutation and a column permutation on an original check matrix of LDPC (Low Density Parity Check) codes, the LDPC codes are decoded. In this case, by using, as a formation matrix, a P×P unit matrix, a quasi-unit matrix in which one or more is, which are elements of the unit matrix, are substituted with 0, a shift matrix in which the unit matrix or the quasi-unit matrix is cyclically shifted, a sum matrix, which is the sum of two or more of the unit matrix, the quasi-unit matrix, and the shift matrix, and a P×P 0-matrix, the transformation check matrix is represented by a combination of a plurality of the formation matrices. A check node calculator 302 simultaneously performs p check node calculations. A variable node calculator 304 simultaneously performs p variable node calculations.

A method for LDPC check matrix configuration based on circular shift matrix grading extension, which comprises configuring a master matrix exclusive of loops with the length of 4, then searching the distribution of loop 6, 8 and 10 in the master matrix, adopting grading expansion method to fill the displacement parameters of the circular shift matrix in the position of 1 element in the master matrix, and finally using circular shift matrix and all 0 matrix to fill the master matrix expansion according to the positions of displacement parameter matrix and 0 element so as to generate check matrix. For timely and effective discovery of good codes with secondarily maximized minimum loop length and average minimum loop length, the invention only requires graded optimization of the combination of the master matrix with very small code length and the circular shift matrix; compared with the method of random circular shift configuration check matrix followed by comparing average minimum loop length, the search volume is significantly reduced. The check matrix not only has excellent performance, but also further reduces average iteration times. The invention is suitable for all methods that adopt circular shift matrix to constitute check matrix.

The invention relates to a physical layer security design method based on alternate iteration in an IRS-assisted MISO system, and belongs to the technical field of wireless communication. The method comprises the steps: constructing an objective function with non-convex constraint, wherein the objective function is composed of a beam forming vector and an intelligent reflection surface phase shift matrix, and the objective function is iteratively solved by adopting an alternating iteration thought; taking the maximizing of the secrecy rate of the system as the purpose, solving a beam forming vector by using a generalized Rayleigh entropy solving method, and then solving an intelligent reflection surface phase shift matrix by using a Dinkelbach algorithm and a Riemannian manifold-based conjugate gradient descent method. Compared with a traditional method for solving the intelligent reflection surface phase shift matrix through a semi-definite relaxation method, the method has the advantages that the operation complexity can be reduced, and the secrecy rate of a system can be increased. The method is simple in implementation process and has a better application prospect.

The embodiment of the invention discloses a virtual image model generation method, a device and a storage medium, belonging to the computer technical field. The method comprises: A plurality of face images and a feature point matrix thereof are obtained, in accordance with that characteristic point matrix, the feature point matrix of natural human face image and the feature point matrix of non-natural human face image, Average matrix, identity shift matrix and expression shift matrix are obtained, facial identity base and facial expression base are obtained by dimension reduction processing, and a virtual image model matching facial expression with facial expression in target facial image is generated according to target facial image, facial identity base, facial expression base and virtual image model base. As only fivesensing organs are used for calculation, that time consumption is short, long-time occupation of processing resources is avoided, the operation performance is improved,and the data amount of the face identity base and the face expression base can be reduced by dimension reduction processing. Moreover, the virtual image model of expression matching can be generatedaccording to the facial identity base and facial expression base, which improves the versatility.

In an audio analysis apparatus, a component acquirer acquires a component matrix composed of an array of component values, columns of the component matrix corresponding to the sequence of unit periods of an audio signal and rows of the component matrix corresponding to a series of unit bands of the audio signal arranged in a frequency-axis direction. A difference generator generates a plurality of shift matrices each obtained by shifting the columns of the component matrix in the time-axis direction with a different shift amount, and generates a plurality of difference matrices each composed of an array of element values in correspondence to the plurality of the shift matrices, the element value representing a difference between the corresponding component values of the shift matrix and the component matrix. A feature amount extractor generates a tonal feature amount including a plurality of series of feature values corresponding to the plurality of difference matrices, one series of feature values corresponding to the series of unit bands of the difference matrix, one feature value representing a sequence of element values arranged in the time-axis direction at the corresponding unit band of the difference matrix.

The invention provides a high-efficiency rock-soil body discrete element value calculation particle searching and operation method. The method comprises the following steps that optimum neighboring particles are searched on the basis of drawn space lattices and particle windows, and the searching algorithm operation is controlled and reduced through the accumulation particle displacement. For non-fluid value simulation such as rock-soil bodies, a displacement matrix control window searching algorithm is used, the searching algorithm generally needs to be operated once for tens of thousands of times of iteration, the speed of a discrete element value method is obviously accelerated, and the dynamic simulation of a rock-soil body large-scale particle system can be realized.

A transient state polarization radar waveform acquisition method and a radar signal transmission method based thereon relate to a method for designing constant module phase encoding enabling a transient state polarization radar to meet good related performance. The methods provided herein aim to solve the problems of high side lobe of the transient state polarization radar waveform and the existing influence of reflected signals of other distant units received by the radar to the reflected signals of a target distant unit. In this invention, firstly, a shift matrix is utilized to establish a function related to a waveform vector; a strong scattering body and a position of a target in a radar scene are ensured and a distant side lobe section needed to be suppressed is estimated so as to construct a waveform optimization objective function; a time-domain optimization formula is transformed into a frequency-domain optimization formula; lastly, self-correlation and cross-correlation requirements of two waveforms are ensured and the waveforms are optimized; and the two waveforms are used as radar signals for transmitting and receiving. According to the invention, the related side lobe can be suppressed; the distant side lobe interference between various scattering bodies distributed along the distant direction is reduced; and the reflected signals of the other distant units are suppressed, thus improving the signal ratio.

The invention discloses a construction method of QC-LDPC (Quasi-Cyclic Low-Density Parity-Check) codes for code modulation, and a code modulation method. The construction method comprises the following steps of: constructing a mother code offset address matrix E of the QC-LDPC codes, and setting a submatrix order to be b; constructing offset address matrixes of the QC-LDPC codes with different code rates on the basis of the matrix E and by virtue of line division and merger properties of a unit shift matrix; and generating the QC-LDPC codes with the different code rates according to the offset address matrixes of the QC-LDPC codes with the different code rates and the submatrix order b. The code modulation method adopts the construction method to generate the QC-LDPC codes and then performs coding and modulation on information bits. According to the technical scheme provided by the invention, the code modulation method fully utilizes line merge codes and excellent properties of part of the line merge codes, can effectively improve the flexibility, expandability and multi-service applicability of a code modulation system on the premise of obtaining the excellent properties, and can ensure a relatively low hardware implementation complexity.

The invention relates to a cost-effective method of modifying a non-scalable coded video signal for generating a scalable coded video signal comprising a base layer and a set of enhancement layers. The base layer results from a bit shift performed by a shift matrix applied on coefficients, and an extraction of a reduced number of least significant bit planes. The enhancement layers result from the bit-plane coding of the least significant bit planes. Contrary to a requantization method that would identically truncate all coefficients in a block and would cause visual artifacts, the shift matrix allows a progressive attenuation of the coefficients. The base layer is then composed of dampened coefficients. The invention also relates to a cost-effective method of modifying said scalable coded video signal for generating a non-scalable coded video signal.

The invention relates to a low-error floor QC-LDPC (Quasi-Cyclic Low-Density Parity-Check) code construction method using ACE (Approximate Cycle Extrinsic Message Degree) and PS (Partition and Shift).In the method, a basic matrix is searched and constructed in combination of PEG (Progressive Edge Growth) and ACE algorithms so as to improve the continuity of a middle ring of the basic matrix; andthen, cyclic extension is performed on the basic matrix based on a PS shift matrix so as to obtain a check matrix. A simulation result indicates that when the bit error rate is 10<-6>, the net codinggrains of a PAP-QC-LDPC (3600, 2700) code of which the constructed code rate is 0.75 and contrastive other two code types having the same code rate are respectively improved by about 0.4dB and 0.8dB;along with the rise of a signal-to-noise ratio, the difference among three bit error rate performance curves is larger; in addition, the PAP-QC-LDPC (3600, 2700) code does not occur obvious error floor after the signal-to-noise ratio is 4dB. Therefore, the method can meet the requirements of a communication system on code rate flexible selection and low-error floor.

The invention belongs to the technical field of radar, and discloses a jagged Doppler frequency shift selection method for DDMA waveform. The method comprises the following steps: determining the number of discrete points in a non-fuzzy Doppler scope and the Doppler frequency shift resolution; calculating the number of clutter Doppler points and the number of times of search, and constructing a Doppler frequency shift matrix; for each element of the Doppler frequency shift matrix, taking the coordinate thereof as the Doppler frequency shift number of a corresponding transmission channel, constructing a corresponding Doppler spectral vector after determining that the transmission channel is in the non-fuzzy Doppler scope, getting a synthetic Doppler spectral vector, and setting the element as the length of a non-overlapping clutter range in the synthetic Doppler spectral vector; and searching the maximum element in the Doppler frequency shift matrix, and calculating the optimal Doppler frequency shift corresponding to each transmission channel according to the coordinate of the maximum element. Through the method, the requirement on high-pulse repetition frequency of DDMA waveform is reduced, and the blind speed problem of a target during application of DDMA waveform is relieved effectively.

The invention relates to a combined constructing method for quasi cyclic-low density parity check codes. The method comprises the steps that firstly, two integers L1 and L2 which are relatively prime are selected, wherein L1 is a prime number, and L=L1*L2; secondly, the row weight Rho of a given code parameter is larger than or equal to 1 but smaller than or equal to L1, the column weight gamma of the given code parameter is larger than or equal to 1 but smaller than or equal to L1, and a shift matrix S(H1) of the shortened array LDPC code with the girth g larger than or equal to 6 is constructed; thirdly, a matrix S(H2) is constructed, elements in a first line and a first column are selected from the set {0,1,2,...,L2-1} at random, and the rest elements are arranged from top to bottom and from left to right one by one; fourthly, the number of g-rings, corresponding to a sparse matrix H, in a tanner graph is counted every time the S(H2) is set with one element, and the fewest elements of the g-rings serve as the elements in the column and line; fifthly, the elements in the S(H) are replaced by an L*L cyclic permutation matrix so that the sparse matrix H with the smaller number of g-rings can be obtained to serve as a check matrix of the LDPC code, the construction of the code is finished, and the QC-LDPC codes (1573,1146) and (1519,870) are obtained. The combined constructing method can obtain the QC-LDPC codes with good ring distribution and superior correcting performance and is suitable for China digital sound broadcasting.

The invention provides an incremental shift matrix construction method, a network coding method and a system, and belongs to the technical field of computers. The incremental shift matrix construction method comprises the steps of firstly, constructing a base vector; secondly, shifting each row below the base vector as a first row rightwards by a single bit relative to the previous row to obtain a parallelogram array; thirdly, conducting the axial symmetry of an upper triangle at the leftmost end of the parallelogram relative to the hypotenuse thereof to obtain a trapezoidal array; fourthly, copying a maximum triangle at the rightmost end of the trapezoidal array to be above the trapezoidal array to obtain a triangular array; finally, according to the values of n and k in a CP-ZD (n, k) code, adopting (n-k) rows from the right-angle vertex of the triangular array and k columns rightwards as an incremental shift matrix. According to the technical scheme of the invention, the storage space is saved. Meanwhile, more data storage requirements can be met for the coding.

The invention relates to a method for constructing a large-girth rule QC-LDPC code based on a Fibonacci-Lucas sequence. According to the method, a shift matrix is constructed by utilizing the specialproperty and structure of a Fibonacci-Lucas sequence, then a check matrix is obtained through expansion, the code length and the code rate of the constructed code pattern can be flexibly changed, andthe surrounding length of the check matrix is at least 8. Simulation result shows that the simulation result shows that: the simulation result shows; when the bit error rate is 10 <-6 >; The FL-QC-LDPC (3138, 1569) code with the constructed code rate of 0.5 is compared with the DY-QC-LDPC (3138, 1569) code. The F-QC-LDPC (3138, 1569) codes and the LOS-QC-LDPC (3128, 1564) codes can respectively improve the net coding gains of about 0.23 dB, 0.25 dB and 0.4 dB, and have good error correction performance.

The invention discloses a 1/4 automobile model modeling method based on McPherson suspension, comprising the following steps: 1) drawing a 1/4 automobile model plan based on McPherson suspension, andmaking related simplified assumptions and definitions; 2) defining a coordinate matrix of each coordinate point on that plan; 3) kinematics analysis of the system based on the geometrical relation inthe plane graph by using the displacement matrix method; 4) defining a force matrix of each coordinate point; 5) taking a certain instantaneous object in that motion of the system to carry out dynamicanalysis; 6) model linearization, i. E. Linearization of the equation at the equilibrium position of the system. As the suspension geometry structure, the moment of inertia of the control arm, the moment of inertia of the tire, the tire dam, the lateral rigidity of the tire and other factors are comprehensively consider, kinematics parameters such as the inclination angle of the kingpin, the camber angle of the tire, the change amount of the wheel tread and the like can be analyzed, the precision is high, the practicability is stronger, and a reliable basis can be provided for the design andperformance analysis of the suspension.

The invention relates to the field of digital signal processing, in particular to a pseudorandom sequence generator with selectable parallel bit width and generating polynomial. A design method of a parallel pseudorandom sequence generator based on FPGA is provided. The concrete steps are as follows: one-step shift matrix is obtained by using the generated polynomial; according to one-step shift matrix and initial value, a series of matrix operations are carried out by using MATLAB to obtain the initialization logic and feedback logic of the register group; according to the initialization logic and feedback logic, the hardware logic is built. The generator has the characteristics of arbitrary parallel number, fewer logic resources and high frequency of clock operation.

The invention discloses a method for generating a low density parity check (LDPC) code. The method comprises the following steps of: reading circle length g and column weight k for a check matrix, and judging whether g/2 is not more than 12; building a full mother matrix with k x k if g/2 is not more than 12; searching effective cyclic shift parameters of each cyclic shift matrix and orders L of each cyclic shift matrix corresponding to each nonzero element in the mother matrix to acquire the cycle shift matrix corresponding to each effective cyclic shift parameter, wherein the cycle shift matrixes corresponding to zero elements in the mother matrix are zero matrixes, the orders are L; acquiring a sparse matrix H according to the cycle shift matrixes, wherein the circle length of the sparse matrix is g/2; acquiring a Tanner pattern of the sparse matrix H; building a sparse check matrix H* through the Tanner pattern, wherein the column weight is 2, and the row weight is k; generating the LDPC code according to the acquired sparse check matrix H*, wherein the circle length is g, the column weight is 2, and the row weight is k. The LDPC code is small in column weight, and is long in circle length, so that the correction performance of a channel is improved.

A method for controlling a system includes determining the lag in data from a variable signal. The data is arranged in matrices with one column for each variable signal. The columns are shifted to produce a plurality of different shifted matrices, each shifted matrix having a given value for the lag in data for each variable signal. A variable signal estimator processes each shifted matrix to output a variable signal function defining each variable signal in terms of its mathematical dependencies on all of the variable signals. A criterial function processes each variable signal function to provide an optimal lag value for each variable signal. A point calculation algorithm processes each shifted matrix to produce a point for each column. A lag estimator processes each point and optimal lag value to output a lag function defining each lag in terms of its mathematical dependency on all of the variable signals.

Provided are a method, system and program for fractionally shifting input data subject to a first transform process without first applying an inverse transformation by using a second transform process. The second transform process applies a transformed matrix to the transformed data. At least one transformed matrix is provided in non-volatile storage, wherein each transformed matrix is generated by applying the first transform process to a fractional shift matrix operator. The input data that was transformed using the first transform process is received and the at least one transformed matrix is applied to the transformed input data to generate transformed data that represents fractionally shifted transformed output data.