5 results about "Matrix inverse" patented technology

An electric-gas coupling system quasi-steady-state simulation method, device and computer readable medium based on branch compensation method. It relates to the improvement of the simulation method of the electric-gas coupling system. It is suitable for occasions with high real-time requirements and can realize fast approximate quasi-dynamic energy flow calculation. It includes the following steps: 1) in the natural gas system, the "circuit-like" method is used to model the natural gas pipeline in a steady state; 2) using the matrix inverse auxiliary theorem, the node pressure is calculated without considering the change of the gas resistance of each pipeline; 3) calculating the branch flow without considering the change of the gas resistance of each pipeline; 4) calculating the node gas pressure considering the change of the gas resistance of each pipeline. The present application extends the branch compensation method to the natural gas system and is suitable for comprehensive modeling, quasi-steady-state simulation and many other scenes of the electric-gas coupling system. When the branch connection condition changes locally, the node admittance matrix is not recalculated, but an approximate result in the new scene is given based on the original calculation result by using the correction method.

The application discloses a power amplifier DPD coefficient estimation method based on an RLS algorithm, obtains an input signal of an input power amplifier (PA) and a feedback output signal after gain adjustment; performs time delay alignment processing on the input signal and the feedback signal; based on a memory polynomial model and a memory polynomial model of cross terms, constructs a nonlinear input matrix and a coefficient matrix of the PA; the recursive least square (RLS) algorithm based on Givens rotation of complex QR decomposition is adopted, a CORDIC algorithm is used to solve a rotation angle and a modulus value, the nonlinear input matrix and the coefficient matrix are iteratively calculated, and DPD coefficients are estimated. The memory polynomial model or the memory polynomial model of cross terms is adopted, so that the PA model is clearer, and data processing is facilitated; the RLS algorithm adopts the RLS expression based on Givens rotation of complex QR decomposition, direct solution of a matrix inverse is not needed, a large number of division operations are avoided, and the problem that the original RLS algorithm is not conducive to engineering implementation in DPD coefficient estimation is solved.

The application discloses a kind of matrix inverse-free ISAR imaging methods based on gamma process-Laplacian prior, mainly solve the problem of two-dimensional reconstruction accuracy not high, long operation time in prior art.It is implementation scheme: receiving defective echo and generating echo matrix;According to defective echo matrix, obtain real Fourier dictionary Φ;According to echo matrix and real Fourier dictionary, the sparse observation model y of each distance unit is constructed q =Φω q +ε;Based on sparse observation model, the weight vector ω of each distance unit q Gamma process-Laplacian hierarchical prior is introduced;Gamma-Gaussian hierarchical prior is introduced to noise vector ε;Using matrix inverse-free fast inference method iteratively solves the weight vector of each distance unit;According to the obtained weight vector, two-dimensional high-resolution image is obtained.The reconstruction accuracy of the application is high, the operation time is short, and can be used for feature extraction and classification identification of space and air non-cooperative target under complex electromagnetic environment such as target echo low signal-to-noise ratio and existence defect.

A communication method and a communication device, the communication method comprising: a first communication device acquiring a signal represented by a 2 M M number of elements, M being an integer greater than or equal to 2, and transmitting the signal to a second communication device through at least one antenna group, each antenna group comprising antennas corresponding to different spatial dimensions, implementing transmission of the signal represented by 2 M M number of elements. Specifically, the algebraic properties of the 2 M M number of elements include a conjugate operation instead of a matrix inverse operation, compared to a scheme in which a signal is represented by a complex number, the technical solution can reduce the processing complexity of the signal to a certain extent by representing the signal by a hypercomplex number.