73 results about "Polynomial kernel" patented technology

A system for digitally linearizing the nonlinear behaviour of RF high efficiency amplifiers employing baseband predistortion techniques is disclosed. The system provides additive or multiplicative predistortion of the digital quadrature (I/Q) input signal in order to minimize distortion at the output of the amplifier. The predistorter uses a discrete-time polynomial kernel to model the inverse transfer characteristic of the amplifier, providing separate and simultaneous compensation for nonlinear static distortion, linear dynamic distortion and nonlinear dynamic effects including reactive electrical memory effects. Compensation for higher order reactive and thermal memory effects is embedded in the nonlinear dynamic compensation operation of the predistorter in an IIR filter bank. A predistortion controller periodically monitors the output of the amplifier and compares it to the quadrature input signal to compute estimates of the residual output distortion of the amplifier. Output distortion estimates are used to adaptively compute the values of the parameters of the predistorter in response to changes in the amplifier's operating conditions (temperature drifts, changes in modulation input bandwidth, variations in drive level, aging, etc). The predistortion parameter values computed by the predistortion controller are stored in non-volatile memory and used in the polynomial digital predistorter. The digital predistortion system of the invention may provide broadband linearization of highly nonlinear and highly efficient RF amplification circuits including, but not limited to, dynamic load modulation amplifiers.

A system for digitally linearizing the nonlinear behaviour of RF high efficiency amplifiers employing baseband predistortion techniques is disclosed. The system provides additive or multiplicative predistortion of the digital quadrature (I/Q) input signal in order to minimize distortion at the output of the amplifier. The predistorter uses a discrete-time polynomial kernel to model the inverse transfer characteristic of the amplifier, providing separate and simultaneous compensation for nonlinear static distortion, linear dynamic distortion and nonlinear dynamic effects including reactive electrical memory effects. Compensation for thermal memory effects also is embedded in the nonlinear dynamic compensation operation of the predistorter and is implemented parametrically using an autoregressive dynamics tracking mechanism. A predistortion controller periodically monitors the output of the amplifier and compares it to the quadrature input signal to compute estimates of the residual output distortion of the amplifier. Output distortion estimates are used to adaptively compute the values of the parameters of the predistorter in response to changes in the amplifier's operating conditions (temperature drifts, changes in modulation input bandwidth, variations in drive level, aging, etc). The predistortion parameter values computed by the predistortion controller are stored in non-volatile memory and used in the polynomial digital predistorter. The digital predistortion system of the invention may provide broadband linearization of highly nonlinear and highly efficient RF amplification circuits including, but not limited to, dynamic load modulation amplifiers.

The invention relates to an electroencephalographic and electromyographic information automatic intention recognition and upper limb intelligent control method and system, which are used for rehabilitation treatment of the upper limb of a stroke patient, an electroencephalographic and surface electromyographic signal collector collects and processes the electroencephalographic and surface electromyographic signals of the patient in real time, a mixed kernel function formed by weighting a polynomial kernel function and an RBF kernel function weights is used to perform fitting and prediction, soas to more accurately identify and monitor the motion intention of the patient, and judge the corresponding degree of rehabilitation, according to which a corresponding rehabilitation training strategy is adopted. When the rehabilitation degree of the upper limb of the stroke patient is low, passive training control is adopted. When the rehabilitation degree of the upper limb of the stroke patient is high, active, assisted and resistive control modes are adopted. The hybrid kernel function support vector machine model provided by the invention has better learning ability and generalization performance, high prediction accuracy and good control performance, and the prediction result meets the index requirements of a rehabilitation robot for stroke patients.

The invention discloses a multi-kernel support vector machine multi-instance learning algorithm applied to pedestrian re-identification. The algorithm includes two main steps, namely multi-feature description and a multi-kernel SVM model multi-instance learning algorithm. According to the algorithm, HSV color features and SIFT local features of two pictures, taken under a camera A and a camera B, of the same pedestrian are extracted to construct a word bag, and difference vectors of the two kinds of the features represent the conversion relation under the two cameras to serve as two instance samples and are encapsulated as a bag; then a multi-kernel support vector machine model is optimized, the bag is trained by means of linear fusion of the Gaussian kernel and a polynomial kernel, optimal parameters are obtained through multi-instance learning, and a high identification rate is achieved.

The invention discloses a method for estimating the instantaneous frequency of a non-stationary signal and is applied to the field of signal processing. The method utilizes the nonlinear frequency modulation wavelet transformation technology, takes into consideration of influences of polynomial kernel characteristic parameters on time-frequency analysis performance during nonlinear frequency modulation wavelet transformation, and selects proper kernel characteristic parameters so as to realize precise estimation on instantaneous frequency of a non-stationary signal. The method has the advantages as follows: 1, due to adoption of the nonlinear frequency modulation wavelet transformation technology, the purpose of precise estimation on the instantaneous frequency of the non-stationary signal can be achieved, and the adopted key technology is selection of nonlinear polynomial kernel characteristic parameters of nonlinear frequency modulation wavelet transformation; 2, by using the instantaneous frequency estimation technology based on nonlinear frequency modulation wavelet transformation, the defect of complicated and overloaded computation of a conventional technology can be avoided, and the method has the advantages of simplicity and high precision; and 3, the method is simple and feasible in computation, and can be applied to the technical field of signal processing and the like.

The invention discloses a lightweight fine-grained image recognition method for cross-layer feature interaction in a weak supervision scene, and the method comprises the steps: constructing a novel residual module through employing multi-layer aggregation grouping convolution to replace conventional convolution, and enabling the novel residual module to be directly embedded into a deep residual network frame, thereby achieving the lightweight of a basic network; then, performing modeling on the interaction between the features by calculating efficient low-rank approximate polynomial kernel pooling, compressing the feature description vector dimension, reducing the storage occupation and calculation cost of a classification full-connection layer, meanwhile, the pooling scheme enables the linear classifier to have the discrimination capability equivalent to that of a high-order polynomial kernel classifier, and the recognition precision is remarkably improved; and finally, using a cross-layer feature interaction network framework to combine the feature diversity, the feature learning and expression ability is enhanced, and the overfitting risk is reduced. The comprehensive performance of the lightweight fine-grained image recognition method based on cross-layer feature interaction in the weak supervision scene in the three aspects of recognition accuracy, calculation complexity and technical feasibility is at the current leading level.

The invention provides a mix nuclear machine learning based fan batch power prediction method. The method includes: establishing a wind-field fan offline historical database; dividing historical data of fans of a wind field of the wind-field fan offline historical database into 12 historical data sets; performing batch division processing on the fans in the wind field; taking the fans closest to the intra-batch wind power average value of each batch as batch sampled fans; establishing wind power prediction models of the batch sampled fans in the wind field; multiplying wind power predication values of the batch sampled fans by the number of the intra-batch fans and summarizing the wind power predication values of the batch sampled fans with the number of the intra-batch fans according to wind power prediction of the batch sampled fans through future weather information of the wind field to acquire the total wind power prediction value of the wind field. Weather data and wind power data are collected, wind power of the different batch sampled fans of the wind field is predicated, Gaussian kernel function and polynomial kernel function are combined to serve as kernel function, better applicability is achieved, the purpose of prediction of the wind power of the entire wind field is realized, and power dispatching of the wind field is guaranteed.

The invention discloses a wind power plant ultrashort term wind speed prediction method based a combination kernel function. The method comprises the following steps: adopting a support vector machine based on the combination kernel function, combining a wavelet kernel function and a polynomial kernel function, combining a global characteristic of the polynomial kernel function with high precision and good learning capacity of the wavelet kernel function, effectively improving predictive capacity of a support vector machine model, and reducing predicting errors. Meanwhile, in building of the support vector machine model, choosing similar data, building models in a classified mode, enabling a training sample and a test sample to have a similar relation, and therefore strengthening nonlinear fitting capacity of a support vector regression model. According to combination of the combination kernel function and the similar data, the wind power plant ultrashort term wind speed prediction method based the combination kernel function improves precision of wind speed prediction.

The invention discloses a surrounding rock category acquisition method based on slag piece image recognition. The method comprises the following steps that S1, a slag piece image is acquired; S2, theprocessed slag piece image is obtained; S3, the surrounding rock grade associated sensitive feature set of the processed slag piece image is calculated; S4, the data sample is divided into k clustersby using an AP clustering method; S5, weight fusion of a Gaussian kernel function and a polynomial kernel function is performed, and LSSVM regression is performed on each cluster of the step S4 so asto obtain k submodules; and S6, weight fusion of the obtained k submodules is performed so as to obtain the surrounding rock category value. The real-time image is acquired and processed without manual participation so that excessive dependence on human experience can be avoided and the surrounding rock grading accuracy and rapidity can be enhanced.

The invention discloses an SVDD radar target one-dimensional distance image identification method based on density weight and a hybrid kernel function and belongs to the radar target identification field. The K-type kernel function has strong generalization capability, extraction of global characteristics of training data is facilitated, complex index operation of a radial basic kernel function isavoided, and properties of small calculation complexity of a polynomial kernel function and high approximation precision of the radial basic kernel function are realized. The radial basic kernel function has quite good local characteristics, the K-type kernel function and the radial basic kernel function are combined to replace a kernel function of a traditional SVDD algorithm, moreover, a localdensity algorithm based on interception distance is employed to calculate local density between a support vector and training sample data in the high-dimensional kernel characteristic space, accordingto density distribution, the shape of a super-closed ball is adjusted, and identification performance of radar one-dimensional distance image single type targets is effectively improved.

A machine learning-based hybrid kernel function indoor positioning method disclosed by the present invention comprises the steps of firstly establishing a fingerprint map library, and taking the fingerprint map library as a training data set; then utilizing a weighted summation method to construct a hybrid kernel function, and using a support vector regression algorithm and a v-folding cross validation method in the machine learning algorithms to train to obtain an optimal weight coefficient and an optimal kernel parameter of the hybrid kernel function; and finally under the premises of the optimal weight coefficient and the optimal kernel parameter, carrying out the offline training learning on the training data set to obtain the fitting functions of an x coordinate and a y coordinate separately, and then utilizing the fitting functions to carry out the online learning on an RSSI value received by a target, thereby obtaining the position coordinate of the target. Compared with the conventional indoor positioning algorithms of a BP neural network algorithm, a k-nearest neighbor algorithm, a linear kernel function algorithm, a polynomial kernel function algorithm and a Gaussian kernel function algorithm, the positioning precision of the algorithm of the present invention is higher.

The invention relates to an internal and external characteristic considered remaining service life prediction method for a lithium ion battery. The method is characterized by comprising the steps: a mixed kernel correlation vector machine MRVM method based on a linear kernel function, a polynomial kernel function and a Gaussian kernel function is built, and the problem that a single-kernel RVM islow in prediction capability is solved; a whale optimization algorithm IWOA with a self-adaptive inertia weight is used for providing more suitable parameters for the MRVM method; and the IWAO algorithm can expand the particle search range, so that particles obtain a global optimal solution, and the prediction precision is improved. In order to more accurately characterize the health state of thebattery, health factors of internal and external characteristics of the battery are extracted as input of the IWOA-MRVM method, and a prediction result with 95% confidence interval is output. Since the internal and external characteristics of the battery are considered in the charge-discharge cycle process of the lithium ion battery, the remaining service life of the battery can be more accuratelyrepresented.

The invention discloses a facial skin quality evaluation method, which comprises the steps of collecting a facial image; graying the facial image through an open source library, and determining coordinates of the face; constructing a mask image of a facial skin region; segmenting the facial image; performing preprocessing and feature extraction; training a classification model of a support vectormachine (SVM) with the classification type being C_SVC, the kernel type being polynomial kernel POLY and the kernel parameter degree being 1.0 so as to obtain a trained SVM classifier; marking the recognized facial acne position with a black circle, and marking the recognized wrinkle position with a black box; and evaluating the skin quality according to the number of the recognized acnes and thefacial proportion occupied by the wrinkles. The facial skin quality evaluation method can eliminate the subjectivity of manual evaluation by judging after learning. Meanwhile, the facial skin qualityevaluation method unifies the brightness, performs Gamma correction and graying, extracts original LBP features and carries out histogram equalization, thereby reducing the calculation amount, and improving the real-time performance and the self-adaptation.

The invention discloses a multichannel electroencephalogram data fusion and dimension descending method. The multichannel electroencephalogram data fusion and dimension descending method comprises the following steps of (1) reading in multichannel electroencephalogram data; (2) performing kernel density estimation on the electroencephalogram data by using a Parzen window to obtain an estimation value of the electroencephalogram data; (3) performing kernel transformation on the electroencephalogram data by using a polynomial kernel function, mapping the electroencephalogram data to corresponding kernel space to form kernel matrixes and fusing all the kernel matrixes corresponding to electroencephalogram of all channels into a synthetic kernel matrix by using different weight numbers; (4) calculating an eigenvalue and an eigenvector of the synthetic kernel matrix; and (5) performing entropy component analysis on the eigenvalue of the synthetic kernel matrix G and the eigenvector of the synthetic kernel matrix G by using a map of kernel entropy principal component analysis (KECA) to obtain low-dimension eigenvalue and eigenvector data and implement fusion and dimension descending of the multichannel electroencephalogram data. By the multichannel electroencephalogram data fusion and dimensional descending method, the electroencephalogram data of each channel are subjected to kernel function mapping, and effective fusion and dimension descending of the multichannel electroencephalogram data can be implemented through multi-kernel entropy component analysis.

The invention provides an antimony ore grade soft-measurement method based on the selective fusion of a heterogeneous classifier. The method comprises the step of together forming a feature space based on the pretreatment of antimony flotation froth image feature data and production data related to the grade of the antimony ore. According to the method, firstly, some feathers are randomly selected to form a plurality of sub-sample spaces. Secondly, a plurality of different sub-samples in each sub-sample space are sampled through the bootstrap sampling process. At the same time, the PCA analysis is conducted on each sub-sample to obtain key features that are high in sensitivity to grade change and free of/weak in dependency. Thirdly, two KELMs are conducted respectively for each sub-sample set to construct a candidate sub-model, based on an RBF kernal of better learning ability and a polynomial kernel type KELM of better generalization ability. Fourthly, each candidate sub-model is endowed with a weight based on the method of information entropy. Finally, all candidate sub-models are sorted from small to large based on the RMSE, and then an optimal weighted sub-model combination is selected as a final model for the prediction on the grade of the antimony ore.

A polynomial kernel generator is configured to mitigate nonlinearity in a receiver path from a transmitter path comprising a nonlinear component in a communication device or system. The polynomial kernel generator operates to generate polynomial kernels that can be utilized to model the nonlinearity as a function of a piecewise polynomial approximation applied to a nonlinear function of the nonlinearity. The polynomial kernel generator generates kernels in a multiplier less architecture with polynomial computations in a log domain using a fixed number of adders.

The invention provides a face recognition construction method and system based on non-linear non-negative matrix factorization and a storage medium. The present invention has the following advantages:1. by using norm substitution F to measure the loss degree of matrix factorization, the problem that the existing kernel non-negative matrix factorization algorithm is sensitive to the singular value is solved, and the stability of the kernel non-negative matrix factorization algorithm proposed by the invention is enhanced. 2. The sparsity of the feature representation of the algorithm of the present invention is enhanced by adding a regularization restriction on the coefficient matrix H into the objective function. 3. By integrating the kernel non-negative matrix factorization with new objective function and fractional inner product kernel function, a sparse fractional inner product nonlinear non-negative matrix factorization algorithm with high performance is obtained, which solves theproblem that the super parameters of polynomial kernel function can only be integers, and improves the discriminant ability of the algorithm.

The invention discloses an expressway traffic event detection method based on a hybrid kernel correlation vector machine, and the method comprises the steps of constructing an expressway traffic event detection initial variable set according to the change characteristics of upstream and downstream traffic flow parameters of a traffic event; learning minority class sample information by adopting a conditional generative adversarial network, training a generator to generate minority class supplementary samples, and balancing data distribution; screening key variables out through variable importance measurement of an XGBoost algorithm; establishing a combined kernel function based on a local Gaussian kernel and a global polynomial kernel; taking the key variables as input, and training a multi-kernel relevance vector machine model; and optimizing parameters through an improved fruit fly optimization algorithm to obtain an optimal model. According to the invention, the traffic incident detection rate is improved, the traffic incident occurring on the expressway is detected in time, time is won for road emergency rescue, casualties and property loss in the event are reduced, and meanwhile, technical support is provided for road traffic safety risk early warning.