253results about How to "High quantitative accuracy" patented technology

The invention discloses a method and equipment for generating a codebook and sending and feeding back information. The method for sending the information comprises the following steps: after the codebook is generated, receiving signals containing codebook index information and extracting the codebook index information; according to the codebook index information, selecting corresponding precoding matrixes from the codebook or subsets of the codebook; precoding data to be sent according to the precoding matrixes; and sending the precoded signals to a receiving end. The method of feeding back channel status information comprises the following steps: receiving information sent by a sending end; estimating channel information on the basis of the received information; selecting the corresponding precoding matrixes from the codebook or the subsets of the codebook according to the channel information,; and sending signals containing codebook index information corresponding to the selected precoding matrixes. By the invention, dual-precoding matrix index feedback can be supported, the quantization accuracy of small-interval dual-polarization array channels can be improved, and the quantization accuracy of small-interval linear array channels can be enhanced.

A system and method for adapting codebooks are provided. A method for communications device operations includes receiving a pilot signal, computing a channel estimate for a channel between a controller and a communications device, the computing being based on the pilot signal, adapting a codebook based on the channel estimate and positions of codewords in the codebook, computing a representation of the channel using the adapted codebook, transmitting the representation of the channel as feedback information, and receiving a transmission beamformed based on the feedback information.

The invention relates to a performance test device for a water immersion focusing probe and a test method thereof. A steel ball is placed on a reference reflection seat of the performance test device placed in a water tank, the corresponding upside of the steel ball is provided and aligned with a probe to be tested, the probe to be tested generates ultrasonic signals to the steel ball through an ultrasonic gauge, and the performance difference of the probe is tested through the variation of reflection signals. A three-dimensional guide adjusting device is adjusted to test the position and variable quantity of the probe in real time so that reflection echo signals of the probe on the steel ball reaches maximum. Effective reflected wave is received by the probe and displayed on a display screen of the ultrasonic gauge in a form of wave height; scale numerical values on X axis, Y axis and Z axis of a graduated scale are recorded respectively; and various performance indexes of the probe are determined by observing the variation of the wave height. The performance test device for the water immersion focusing probe and the test method thereof are simple and practical, and can test the indexes such as focus, sound width, focus diameter, sound offset angle, sensitivity surplus, sensitivity deflection of a multi-chip probe and the like without depending on special laboratory equipment.

An imaging method comprises reconstructing gated emission tomography images for a region of interest, adjusting a mismatch between the gated emission tomography images and a computed tomography image of the region of interest, registering the gated emission tomography images, and combining the registered gated emission tomography images to generate motion corrected images.

Based on anatomy recognition from three-dimensional live imaging of a volume, one or more portions (204, 208) of the volume are selected in real time. In further real time response, live imaging or the portion(s) is performed with a beam density (156) higher than that used in the volume imaging. The one or more portion may be one or more imaging plane selected for optimal orientation in making an anatomical measurement (424) or display. The recognition can be based on an anatomical model, such as a cardiac mesh model. The model may be pre-encoded with information that can be associated with image locations to provide the basis for portion selection, and for placement of indicia (416, 420, 432, 436) displayable for initiating measurement within an image provided by the live portion imaging. A single TEE or TTE imaging probe (112) may be used throughout. On request, periodically or based on detected motion of the probe with respect to the anatomy, the whole process can be re-executed, starting back from volume acquisition (S508).

A method for producing an image of a layer of an object by a wide field optical element on a resolving detector. The object is illuminated in a focused manner on at least one object plane having at least two binary illuminating patterns. The corresponding images are detected. Light and/or the dark areas of the illuminating patterns completely cover the object when the illuminating pattern is superimposed. A layer image determined from the detected images, includes a partial segment that respectively reproduces a partial area of the object that is arranged inside the light area of one of the used illuminating patterns. Edges are arranged at a distance from the edges of the light area about at least one predefined minimum distance.

The invention relates to the field of high-flux gene sequencing, and provides a method and system for comparing definition of a plurality of sequencing images and an automatic focusing control method. According to the method for comparing the definition of the sequencing images, harmonic analysis processing is carried out on the sequencing images, then closed curves are fitted according to textural features of harmonic analysis processing pictures, the area ratios of the figures corresponding to the closed curves to the corresponding sequencing images are obtained according to the closed curves, and accordingly the sequencing image with the highest definition is determined by comparing the area ratios. Compared with the prior art, the method and system have the advantage of being high in quantizing precision. Besides, the invention further provides an automatic focusing control method based on the definition comparing method, and according to the method, an automatic focusing position can be accurately positioned.

The invention relates to a nonuniform quantizing coding method used for decoding an LDPC code and the application of the method in a decoder. The method comprises the steps that the quantification range of messages L(rji), L(qij) and L(Qi) is determined according to information distribution of an initial message L(Pi), a coding mode is adopted for performing nonuniform quantizing on the messages L(rji), L(qij) and L(Qi), quantized intervals of positive number portions and negative number portions are respectively divided into m sections, coding is a codon composed of 1-bit polar codes, k-bit segment codes and (n-1-k)-bit in-segment codes, the polar codes mark positive numbers and negative numbers, the segment codes mark different segments, the segment internal codes show specific size of the data in the segments, each segment is divided into 2<g> small segments, and the small segments are the quantized intervals of the corresponding segments. According to the method, consumption of hardware storage resources, operation processing units and locating and wiring resources is reduced, quantization errors of small-value data are reduced, and the decoding performance is improved.

The invention relates to a geographic tuple based quantitative prediction method of ore concentration areas, which is characterized by establishing the quantitative prediction method of mineral resources in the Central Asia region by analyzing the time-space evolution process of the mineral resources in the region, taking GIS as a platform, applying the nonlinear theory and the artificial neural network technology, integrating multivariate information such as geology, geophysics, geochemistry, remote sensing and the like, carrying out analogy on the geological characteristics of the minerals at different levels and the metallogenetic geological setting and dividing favorable metallogenetic areas at different levels. The method solves the problem of failure of quantitative prediction in the prior art.

The invention provides an improved coding and decoding device and method based on the linear predictive parameter coding basic principle. Intra-frame and inter-frame correlations of parameters and the correlations among all the parameters are fully utilized, and all the parameters of a coder are compressed by the utilization of the vector quantization technology; while the compression is performed, the auditory perception characteristic of the human ears is fully utilized to perform quantization or inverse quantization on all the parameters by the utilization of different weighing distortion measurements, so that data are effectively compressed on the premise that the auditory sense quality of the human ears is not affected. On the premise that speech quality is ensured, the coding and decoding device and method of ultralow-bit-rate speech achieves coding and decoding of the ultralow-bit-rate speech with algorithm complexity as low as possible while working at the bit rate of 600bps and the bit rate of 300bps.

The invention provides a cursor annular time-digit converter. The cursor annular time-digit converter comprises a first pulse width generator, a quick voltage control delay chain, a second pulse width generator, a slow voltage control delay chain and a comparator array. The cursor annular time-digit converter has high quantization precision and a few structures, and the area can be effectively reduced; when a comparator in the comparator array turns over for the first time, the quick voltage control delay chain and the slow voltage control delay chain can both reset, so that signals of the quick voltage control delay chain and the slow voltage control delay chain are both at low levels, jumping never happens again, and consequently power consumption of work is lowered.

The present invention discloses a digital weight average algorithm applied to a successive approximation register analog-to-digital converter, characterized in that a pseudo-random number generator is added in a circuit of the successive approximation register analog-to-digital converter, a random pin code is generated by the pseudo-random number generator before each quantization of the successive approximation register analog-to-digital converter, and the connection of each unit capacitor is determined by the pin code through successive approximation register control logic, so that the unit capacitors form capacitors of different weights at random. In the present invention, the DWA algorithm is applied to a structure of the SAR ADC, so that the harmonic of an output signal is suppressed to the noise floor, to realize the first-order shaping of the noise of the output signal, thereby increasing the spurious-free dynamic range of the SAR ADC; and when the number of times of quantification of the SAR ADC reaches a certain number, the DWA algorithm enables capacitor mismatch to be allocated to each quantization, to average the capacitor mismatch, reduce the effect of the capacitor mismatch on the static characteristic and the dynamic characteristic of the SAR ADC, and improve the quantization accuracy of the SAR ADC.

The invention relates to qualitative and quantitative analysis for X-ray diffraction mineral. Wherein, the X-ray diffraction phase analysis sample bracket comprises a silicon single-crystal piece in the following base frame, a base frame, and a dust-carry film stuck on said single-piece; the single-crystal piece is single diffraction peak, and is prepared by cutting into pieces along the crystal face 0-12Deg and grinding and polishing. This invention can eliminate the effect to measurement accuracy from device, time and parameter, simplifies operation, and cuts time to improve efficiency.

The invention relates to a method for generating codebooks under relevant channels in a wireless communication system, and belongs to the technical field of wireless communication. In the method, a base station and users use two same initial codebooks, one initial codebook is composed of conventional DFT code words, and the other initial codebook is composed of random vectors. Each user calculates the relevant matrix rank information of an own channel and feeds the matrix rank information back to the base station; and the base station and the users independently generate new two-stage target codebooks based on weighing DFT code words by the same algorithm by utilizing the initial codebooks according to the rank information. The weighing DFT code word-based codebooks designed by the method have a flexible structure of the two-stage target codebooks, improve the quantified accuracy of the channels, and can be adaptively applied to the relevant condition of different channels; and the existing rank feedback information in the conventional standard is utilized fully without causing the expense of an additional system feedback link, so the weighing DFT code word-based codebooks are compatible with the conventional system, and can be applied to the future wireless communication system conveniently.

The present invention maintains a stable emission amount from an emitter. In an embodiment of the present invention, a solid sample or a liquid sample is heated to gasify an object to be measured contained in the solid sample or the liquid sample, thereby forming a neutral gaseous molecule, and a metal ion emitted from an emitter having an oxidized surface is attached to the neutral gaseous molecule to ionize the neutral gaseous molecule, which is subjected to mass spectrometry. The solid sample or the liquid sample is a sample that emits a reducing gas by heating. The heating for gasifying the object to be measured is performed at a temperature lower than the vaporization temperature of the solid sample or the liquid sample and not less than the vaporization temperature of the object to be measured, and an oxidizing gas is provided to the emitter.