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31results about How to "Low signal to noise" patented technology
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Mixed sound signal separation method and device, electronic equipment and readable medium
ActiveCN109801644ALow signal to noiseImprove training efficiencySpeech recognitionCode moduleSignal-to-noise ratio (imaging)
The invention relates to a mixed sound signal separation method and device, electronic equipment and a readable medium. The method includes: extracting mixed sound characteristic data from mixed soundsignals; inputting the mixed sound characteristic data into a mixed sound coding module to obtain a first hidden variable and a second hidden variable, wherein the first hidden variable represents human voice characteristics, and the second hidden variable represents accompany sound characteristics; inputting the first hidden variable and the second hidden variable into a human voice decoding model and an accompany sound decoding model to obtain human voice characteristic data and accompany sound characteristic data; acquiring human voice and accompany sound on the basis of the human voice characteristic data and accompany sound characteristic data. The human voice and the accompany sound obtained according to the method is low in signal-to-noise ratio.
Owner:BEIJING DAJIA INTERNET INFORMATION TECH CO LTD
Radar adaptive beam forming method based on oblique projection filtration
The invention discloses a radar adaptive beam forming method based on oblique projection filtration. The method comprises the following steps: (1) signals received by N array elements in an array are set to be x(t), and interference and noise are included; a covariance matrix Rxx for the signals x(t) received by the N array elements is built, eigenvalue decomposition is carried out on the matrix, and interference signal subspace UJ and noise signal subspaceUn are obtained; (2) an interference judgment rule is built, and signal subspace Em for main lobe interference and signal subspace for side lobe interference are determined respectively in the interference signal subspace UJ; (3) an oblique projection operator B is built to carry out oblique projection filtration treatment on the signals x(t) received by the N array elements, signals y(t) after oblique projection filtration treatment are obtained, and a covariance matrix Ryy is built; (4) noise in the covariance matrix Ryy for the signals y(t) after oblique projection filtration treatment is corrected, and a covariance matrix R after correction is obtained; and (5) according to the covariance matrix R after correction, adaptive beam forming is carried out on the signals x(t) received by the N array elements, and signals z(t) after adaptive beam forming are obtained.
Owner:XIDIAN UNIV
Method for performing intelligent division for stratigraphic position based on logging information
The invention discloses a method for performing intelligent division for the stratigraphic position based on logging information. The method comprises the following steps that a, the curve peak and valley are found; b, the relative depth difference and the measured coordinate difference between two wells are calculated; c, the input curve is smoothed; d, single curve similarity detection is performed; e, multi-curve similarity detection is performed; f, a stratigraphic division model based on the single curve is established; and g, a stratigraphic division model based on the multiple curves isestablished. According to the method, the idea of performing stratigraphic division by using the mathematical algorithm according to the logging information is put forward for the first time so thattwo problems of high artificial influence factor of stratigraphic division and difficulty of transmission of the division experience can be overcome, and the speed and the accuracy of stratigraphic division can be enhanced.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Method for estimating high-accuracy arrival direction without knowing information source number
InactiveCN104076324AEasy to implementReliable estimateMulti-channel direction-finding systems using radio wavesWorkloadSpatial spectrum
The invention discloses a method for estimating a high-accuracy arrival direction without knowing an information source number. Time smoothing processing is carried out on data received by an antenna array by setting K different time smoothing intervals to built K space-time autocorrelation matrixes; a final combined space-time autocorrelation matrix and a spatial spectrum function of arrival direction estimation are calculated; spectrum peak searching is carried out on the spatial spectrum function by gradually changing the searching direction, and then the information source number and the arrival direction are estimated. By means of the method for estimating the high-accuracy arrival direction without knowing the information source number, the arrival direction of signals is estimated without estimating the information source number in advance or carrying out characteristic decomposition on the autocorrelation matrixes of the received signals. Thus, the method is high in reliability, small in workload and easy to achieve through hardware, and makes application of arrival direction estimation to an actual system possible.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Method, device and system for data transmission
ActiveCN106712917AEasy to receiveEfficient acquisitionError preventionNetwork topologiesTime domain waveformsData transmission
The invention discloses a method, a device and a system for data transmission, which belong to the technical field of data communication. The data transmission device comprises a processing unit and a transmitting unit, wherein the processing unit is used for generating a data frame according to to-be-transmitted data, the data frame sequentially comprises a low rate (LR) preamble, a basic preamble, a high efficiency wireless local area network (HEW) preamble and a data part, the LR preamble comprises a low rate short training field (LR-STF), the LR-STF comprises at least two first symbols arranged in a time domain, the content of each first symbol is the same, the period of a time domain waveform corresponding to the first symbol is 1.6 microseconds, and the LR-STF is used for timing synchronization; and the transmitting unit is used for transmitting the data frame to a receiving end. Thus, the problem that the reliability of data frame transmission is poor is solved, the data frame transmission reliability is improved, and the method, the device and the system of the invention can be used for data transmission.
Owner:HUAWEI TECH CO LTD
Quadrature reflection index modulation method of intelligent reflection surface auxiliary wireless communication system
ActiveCN112260975AImprove spectral efficiencyAccurate information transmissionTransmission monitoringMulti-frequency code systemsReal-time computingSMARAD
The invention discloses a quadrature reflection index modulation method of an intelligent reflection surface auxiliary wireless communication system. The quadrature reflection index modulation methodcomprises the following steps: S1, carrying out quadrature reflection modulation on information by grouping element units of an intelligent reflection surface; S2, establishing index modulation with the receiving antenna serial number as an index resource; S3, determining the optimal reflection phase shift of each group of elements of the intelligent reflection surface; S4, selecting an orthogonalscheme of the two paths of signals after orthogonal reflection index modulation; and S5, demodulating the sent information at a receiving end. According to the operation of grouping the intelligent reflection surface element units, a certain bit of information can be additionally transmitted; wherein an orthogonal scheme of index modulation taking the receiving antenna serial number as an index resource and selecting two paths of modulated signals is established, so that the bit error rate of the system can be reduced under the condition of relatively low signal-to-noise ratio, and thus the spectral efficiency of the communication system is improved.
Owner:SOUTH CHINA UNIV OF TECH
High-frequency coil device for nuclear spin tomography contrast instrument and nuclear spin tomography contrast instrument
InactiveCN1387825AImprove image qualityLow signal to noiseMagnetic property measurementsDiagnostic recording/measuringTomographyNuclear magnetic resonance
High-frequency coil arrangement for a magnetic resonance tomography apparatus and magnetic resonance tomography apparatus employing such an arrangement have a surface coil and a loop coil for enclosing the examination subject. Both coils are fashioned for receiving the same first polarization component. A switching device is present for alternately deactivating and / or activating the surface coil and the loop coil. The two coils are preferably arranged on a common carrier structure that is bendable.
Owner:SIEMENS HEALTHCARE GMBH
Method, device and system for preventing eavesdropping and stealthy recording in conference
PendingCN112448787ALow signal to noiseAchieving Active Noise CancellationTelevision conference systemsCommunication jammingConfidentialitySound wave
The embodiment of the invention discloses a method, a device and a system for preventing eavesdropping and stealthy recording in a conference. The method comprises any one or more of the following steps: transmitting N first sound wave signals in an omnibearing manner, wherein for each first sound wave signal, the first sound wave signal is obtained by performing frequency modulation on a specificsignal sequence, and the average amplitude of the specific signal sequence is greater than or equal to a preset threshold, and N is an integer greater than or equal to 1; directionally transmitting asecond sound wave signal to one or more than one audio collector in the X audio collectors of the conference, wherein the frequencies of the first sound wave signal and the second sound wave signal are the same, and are in a frequency band which cannot be perceived by human beings, the second sound wave signal is obtained by performing frequency modulation on the reverse sequence, the reverse sequence is obtained according to N specific signal sequences, and X is an integer greater than or equal to 1. According to the embodiment of the invention, the confidentiality of conference content is improved.
Owner:ZTE CORP
Glass-micropipe-based single nanopore sensor and manufacturing method thereof
InactiveCN102175738AUniform and defined material propertiesImprove structural stabilityMaterial analysis by electric/magnetic meansNanosensorsEngineeringVoltage source
The invention discloses a glass-micropipe-based single nanopore sensor which comprises a glass micropipe, a single nanopore, two fluid chambers, a first voltage source, two Pt electrodes, an ammeter and a second voltage source, wherein the glass micropipe is provided with a protuberance at one end; the single nanopore is arranged in the protuberance; the two fluid chambers are respectively arranged at both ends of the single nanopore and connected with each other through the single nanopore; the first voltage source is used for applying voltages to the two fluid chambers; the two Pt electrodes are arranged on the protuberance and arranged at the upside and downside of the single nanopore; the ammeter is used for detecting voltage between the two Pt electrodes and both ends of the ammeter are respectively connected with the two Pt electrodes; the second voltage source is used for applying voltage to the two Pt electrodes; and the single nanopore and the fluid chambers are all provided with electrolyte. The sensor provided by the invention uses four electrodes to obtain radial current and axial current, so that the sensor disclosed by the invention can have higher sensitivity. Meanwhile, the method disclosed by the invention is simple and can greatly reduce the manufacturing cost of the sensor.
Owner:SOUTHEAST UNIV
Fluorescent probe for tumor diagnosis and treatment as well as preparation method and application of fluorescent probe
InactiveCN109400584AStrong targetingRealize integrationOrganic chemistryEnergy modified materialsPhotoinduced electron transferExtinction
The invention provides a fluorescent probe for tumor diagnosis and treatment as well as a preparation method and an application of the fluorescent probe. In the fluorescent probe, an azacyclo structure base is taken as an H<+> receptor, a near infrared fluorescent dye with high extinction coefficient and tumor targeting effect is taken as a fluorophore, then the OFF-ON type probe capable of regulating fluorescence intensity by rapid PET (photoinduced electron transfer) process is formed, fluorescence of the probe is strengthened in a slightly acidic environment of tumor, tumor detection is realized, the probe has strong PA (photoacoustic) signals at the tumor while fluorescence imaging is performed, and tumor boundary can be determined accurately by NIRF / PA bimodal imaging. The fluorescentprobe also has good photo-thermal treatment effect on the tumor and can be used for preparing corresponding tumor treatment drugs.
Owner:SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
Relay-based distributed collaborative spectrum perception method
ActiveCN105207728AImprove detection rateExcellent detection probabilityModulated-carrier systemsTransmission monitoringFrequency spectrumSpectral efficiency
The invention provides a relay-based distributed collaborative spectrum perception method, belongs to the field of wireless spectrum allocation and utilization, and is to solve the problems that an existing distributed spectrum perception method is low in spectrum utilization rate, and a suddenly-appeared authorization user disturbs authorization user information transmission and separation between authorization user information and perception user information. The relay-based distributed collaborative spectrum perception method comprises the following steps: the authorization user obtaining and sending signals, a perception user obtaining larger signal power being a perception user U1, and the other one being a perception user U2; and taking the perception user receiving the larger signal power from the authorization user as a relay, and by adopting an amplify-forward (AF) protocol, assisting the other perception user to carry out spectrum perception and signal transmission. The method can improve detection probability of the perception user end, and meanwhile, can improve spectrum efficiency of the system under the condition of ideal channel estimation and signal separation.
Owner:HARBIN INST OF TECH
Prestack seismic texture analysis method based on gradient co-occurrence matrix
ActiveCN109031423AHigh signal resolutionReduce the impact of noiseSeismic signal processingImage resolutionEnvironmental geology
The invention discloses a prestack seismic texture analysis method based on a gradient co-occurrence matrix. The method comprises the following steps of S1, acquiring four-dimensional data V to be analyzed from prestack seismic data D; S2, defining a gradient computation direction (formula) and defining a four-dimensional sub-data set (formula); S3, establishing a four-dimensional sub-data set S with the size of T*NI*NC*No by taking a line (:, i, j, k) formed by T sample points in the V as the center, and computing the gradient of each point in the S in sequence in order to obtain a gradient matrix M; and S4, constructing a gradient co-occurrence matrix G based on the gradient matrix, and computing texture feature attributes based on the gradient co-occurrence matrix G. On the basis of a gray level co-occurrence matrix, gradient information is added, and some statistical quantities are extracted from the gradient co-occurrence matrix to reflect the textural features, and the texture analysis method has the advantages that the signal resolution is improved, and the noise influence is reduced.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA
Preparation method and application of PVC-carbon paste modified electrode for lead ion detection
PendingCN111239216AImprove conductivityHigh mechanical strengthMaterial electrochemical variablesTap waterMaterials science
The invention provides a preparation method and application of a PVC-carbon paste modified electrode for lead ion detection. The electrode can directly adsorb Pb <2+> in tap water, and PVC in the electrode can be used as a binding material and an enriching agent for Pb <2+>. The electrode has the advantages of wide linear range, low detection limit, good reproducibility, strong anti-interference performance and the like, and can be directly used for detecting Pb <2+>. The linear range of the electrode for measuring the lead ions is 2.0 * 10 <-5>-1.0 * 10 <-7> mol / L, and the detection limit is5.0 * 10 <-8> mol / L.
Owner:广州钰芯传感科技有限公司
Spatial domain information joint estimation method under directional electromagnetic coupling effect
PendingCN112579972AImprove performanceImprove estimation performanceComplex mathematical operationsEngineeringFitting algorithm
The invention provides a spatial domain information joint estimation method under a directional electromagnetic coupling effect, and the method comprises the following steps: calculating a covariancematrix of a received signal, performing eigenvalue decomposition, constructing a matrix only related to an angle, constructing a fitting equation by using a weighted subspace fitting algorithm, and estimating DOA to obtain a preliminary DOA estimation result; estimating a cross-coupling coefficient matrix by using the preliminarily estimated DOA, solving an array flow pattern by using the estimated cross-coupling matrix, and estimating the DOA again by using a subspace fitting algorithm. According to the method, the mutual coupling matrix corresponding to each direction of arrival is estimated, DOA is precisely estimated by using the estimated mutual coupling matrix, a fitting equation is constructed by using a subspace fitting algorithm, and the equation can be solved through an optimization problem. And the estimation performance is excellent, and the performance of the method is obviously superior to that of a subspace decomposition algorithm especially when the signal-to-noise ratio is low and the snapshot number is small.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Communication protocol suitable for inductive coupling transmission
InactiveCN112153063ALow signal to noiseReduce frame lossError preventionCommunications systemCommunications protocol
The invention relates to the technical field of communication protocols, in particular to a communication protocol suitable for inductive coupling transmission. The communication protocol suitable forinductive coupling transmission is characterized by comprising the following steps of: 1) setting protocol content; 2) carrying out timeout detection behind a starting bit and in front of the end ofa data frame; and 3) carrying out data transmission. According to the communication protocol, messy codes in an idle state can be effectively filtered out, normal data are reserved, and the frame lossrate of an inductive coupling communication system is remarkably reduced.
Owner:杭州浅海科技有限责任公司
Glass-micropipe-based single nanopore sensor and manufacturing method thereof
InactiveCN102175738BReduce manufacturing costImprove structural strengthMaterial analysis by electric/magnetic meansNanosensorsVoltage sourceNanopore
The invention discloses a glass-micropipe-based single nanopore sensor which comprises a glass micropipe, a single nanopore, two fluid chambers, a first voltage source, two Pt electrodes, an ammeter and a second voltage source, wherein the glass micropipe is provided with a protuberance at one end; the single nanopore is arranged in the protuberance; the two fluid chambers are respectively arranged at both ends of the single nanopore and connected with each other through the single nanopore; the first voltage source is used for applying voltages to the two fluid chambers; the two Pt electrodes are arranged on the protuberance and arranged at the upside and downside of the single nanopore; the ammeter is used for detecting voltage between the two Pt electrodes and both ends of the ammeter are respectively connected with the two Pt electrodes; the second voltage source is used for applying voltage to the two Pt electrodes; and the single nanopore and the fluid chambers are all provided with electrolyte. The sensor provided by the invention uses four electrodes to obtain radial current and axial current, so that the sensor disclosed by the invention can have higher sensitivity. Meanwhile, the method disclosed by the invention is simple and can greatly reduce the manufacturing cost of the sensor.
Owner:SOUTHEAST UNIV
Nanochannel detecting antigen-antibody specific binding and preparing method and detecting method thereof
ActiveCN105866398AAccurately judge the via hole situationHigh sensitivitySemi-permeable membranesFixed microstructural devicesEngineeringNanopore
The invention provides a nanochannel with a nanocage structure. The nanochannel comprises a top SiN film layer, a middle SiO2 interlayer and a bottom SiN film layer which form a sandwich structure, wherein a small nanopore with area slightly larger than the maximum sectional area of antigen to be detected and smaller than the minimum sectional area of antibody to be detected is machined on the top SiN film layer, a large nanopore with diameter larger than that of the small nanopore is machined on the bottom SiN film layer and located at a position aligned with the small nanopore in the axial direction, and SiO2 between the small nanopore and the large nanopore is corroded into a hollow nanocage structure; two liquid bath units filled with ionic solution are connected to the two ends of the nanochannel with a nanocage structure, and the antigen and the antibody are added into the same liquid bath next to the small nanohole. When ionic current change is detected under both forward and reverse voltage, it is concluded that specific binding of the antigen and the antibody is not achieved. When ionic current change is detected under forward voltage only, it is concluded that specific binding of the antigen and the antibody is achieved, and then identifying detection of antigen or antibody molecules can be achieved.
Owner:SOUTHEAST UNIV
Radar Adaptive Beamforming Method Based on Oblique Projection Filtering
The invention discloses a radar adaptive beam forming method based on oblique projection filtration. The method comprises the following steps: (1) signals received by N array elements in an array are set to be x(t), and interference and noise are included; a covariance matrix Rxx for the signals x(t) received by the N array elements is built, eigenvalue decomposition is carried out on the matrix, and interference signal subspace UJ and noise signal subspaceUn are obtained; (2) an interference judgment rule is built, and signal subspace Em for main lobe interference and signal subspace for side lobe interference are determined respectively in the interference signal subspace UJ; (3) an oblique projection operator B is built to carry out oblique projection filtration treatment on the signals x(t) received by the N array elements, signals y(t) after oblique projection filtration treatment are obtained, and a covariance matrix Ryy is built; (4) noise in the covariance matrix Ryy for the signals y(t) after oblique projection filtration treatment is corrected, and a covariance matrix R after correction is obtained; and (5) according to the covariance matrix R after correction, adaptive beam forming is carried out on the signals x(t) received by the N array elements, and signals z(t) after adaptive beam forming are obtained.
Owner:XIDIAN UNIV
Conductive material, ultrasonic fingerprint module and electronic equipment
InactiveCN112016397ASmall particle sizeEvenly distributedPrint image acquisitionInput/output processes for data processingSilver pasteSurface roughness
The invention provides a conductive material which is obtained after prepared silver paste is cured, the silver paste comprises, by mass, 55%-65% of silver powder, the silver powder is formed by mixing flaky silver powder and spherical silver powder, and the mass ratio of the flaky silver powder to the spherical silver powder ranges from 7: 3 to 8: 2 and is resin with the mass ratio of 16%-20%; the mass ratio of the solvent is 10%-14%; and an aid. Compared with the prior art, the conductive material has good adhesive force on the surface of a piezoelectric layer (generally fluoride), the surface roughness of the material is low, large silver particles do not exist in the material, and the silver particles are not aggregated. The invention also provides an ultrasonic fingerprint module andelectronic equipment.
Owner:NANCHANG OUFEI BIOLOGICAL IDENTIFICATION TECH
Brain-computer interface communication device
InactiveCN108498093AImprove performanceImprove reliabilityDiagnostic recording/measuringSensorsBrain computer interfacingSignal-to-noise ratio (imaging)
The invention discloses a brain-computer interface communication device. According to the brain-computer interface communication device, the whole performance and the reliability are improved, and theproblems that a collected and detected electroencephalogram signal is very weak and is inevitably blended with various noises, the signal to noise ratio of the data is relatively low, and therefore,the signal communication needs to be realized by virtue of a reliable technique are solved. The brain-computer interface communication device comprises a brain module, a receiving module and a brain-computer connector.
Owner:刘至键
A Relay-Based Distributed Cooperative Spectrum Sensing Method
ActiveCN105207728BImprove detection rateExcellent detection probabilityModulated-carrier systemsTransmission monitoringCognitive userFrequency spectrum
Owner:HARBIN INST OF TECH
Prestack Seismic Texture Analysis Method Based on Gradient Co-occurrence Matrix
ActiveCN109031423BHigh signal resolutionReduce the impact of noiseSeismic signal processingData setImage resolution
The invention discloses a pre-stack seismic texture analysis method based on a gradient co-occurrence matrix, comprising the following steps: S1, obtaining 4-dimensional data V to be analyzed from pre-stack seismic data D; S2, defining the gradient calculation direction and defining the 4-dimensional sub Data set S∈V; S3, centered on the line (:, i, j, k) composed of T sample points in V, the size is T×N I ×N C ×N o The 4-dimensional sub-dataset S of S, calculates the gradient of each point in S sequentially, and obtains the gradient matrix M; S4, constructs the gradient co-occurrence matrix G based on the gradient matrix, and calculates the texture feature attribute based on the gradient co-occurrence matrix G. The present invention adds gradient information on the basis of the gray level co-occurrence matrix, and extracts some statistics from the gradient co-occurrence matrix to reflect texture features. This texture analysis method reduces noise influence while improving signal resolution.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Method for Determining the Source of Colored Soluble Organic Compounds Based on Fluorescence Spectrum Integral Ratio
ActiveCN106442441BLow costZero pollutionFluorescence/phosphorescenceOperabilityFluorescence intensity
Owner:NANJING INST OF GEOGRAPHY & LIMNOLOGY
Orthogonal reflective index modulation method for intelligent reflective surface assisted wireless communication system
ActiveCN112260975BImprove spectral efficiencyAccurate transmissionTransmission monitoringMulti-frequency code systemsFrequency spectrumCommunications system
Owner:SOUTH CHINA UNIV OF TECH
A recovery type near-infrared fluorescent probe with pH response and its preparation method and application
ActiveCN104592987BLow signal to noiseGood linear relationshipOrganic chemistryFluorescence/phosphorescenceChemical structureSignal-to-noise ratio (imaging)
The invention provides a restoring-type near infrared fluorescence probe with pH response. The chemical structural formula is shown as a formula (I) in the specification, wherein X refers to C(CH3)2, O, S or Se, Y refers to halogen, Z refers to NH, O or S, R1 and R2 are respectively independently selected from H, C1-18 alkyl or SO3R5, R5 refers to C1-18 alkyl or benzyl, and R3 and R4 are respectively independently selected from C1-18 alkyl or benzyl. When the restoring-type near infrared fluorescence probe with pH response is between pH 5.0 and pH 7.5, the fluorescence intensity is gradually enhanced along with reduction of the pH value, and an excellent linear relation is formed between the fluorescence intensity and the pH value. The stocks displacement is large, the signal to noise ratio is low, the toxicity is low, the damage to cells and living bodies is small, the pKa is 6.4, the probe is very suitable for tumor detection, and the defects of fluorescence probes in the prior art are overcome. The invention also provides a method for preparing the probe. The preparation method is simple.
Owner:SHENZHEN INST OF ADVANCED TECH
A method of intelligently dividing stratigraphic horizons based on well logging information
The invention discloses a method for performing intelligent division for the stratigraphic position based on logging information. The method comprises the following steps that a, the curve peak and valley are found; b, the relative depth difference and the measured coordinate difference between two wells are calculated; c, the input curve is smoothed; d, single curve similarity detection is performed; e, multi-curve similarity detection is performed; f, a stratigraphic division model based on the single curve is established; and g, a stratigraphic division model based on the multiple curves isestablished. According to the method, the idea of performing stratigraphic division by using the mathematical algorithm according to the logging information is put forward for the first time so thattwo problems of high artificial influence factor of stratigraphic division and difficulty of transmission of the division experience can be overcome, and the speed and the accuracy of stratigraphic division can be enhanced.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Nanochannel for detecting antigen-antibody specific binding, preparation method and detection method thereof
ActiveCN105866398BDifficult to exerciseAccurately judge the via hole situationSemi-permeable membranesVolume/mass flow by thermal effectsEngineeringNanopore
The invention provides a nanochannel with a nanocage structure. The nanochannel comprises a top SiN film layer, a middle SiO2 interlayer and a bottom SiN film layer which form a sandwich structure, wherein a small nanopore with area slightly larger than the maximum sectional area of antigen to be detected and smaller than the minimum sectional area of antibody to be detected is machined on the top SiN film layer, a large nanopore with diameter larger than that of the small nanopore is machined on the bottom SiN film layer and located at a position aligned with the small nanopore in the axial direction, and SiO2 between the small nanopore and the large nanopore is corroded into a hollow nanocage structure; two liquid bath units filled with ionic solution are connected to the two ends of the nanochannel with a nanocage structure, and the antigen and the antibody are added into the same liquid bath next to the small nanohole. When ionic current change is detected under both forward and reverse voltage, it is concluded that specific binding of the antigen and the antibody is not achieved. When ionic current change is detected under forward voltage only, it is concluded that specific binding of the antigen and the antibody is achieved, and then identifying detection of antigen or antibody molecules can be achieved.
Owner:SOUTHEAST UNIV
Multi-target direct positioning method based on block sparse Bayesian
PendingCN114374927ALow signal to noiseHigh positioning accuracyLocation information based serviceComplex mathematical operationsEngineeringSignal-to-noise ratio
The invention relates to the field of signal processing, in particular to a multi-target direct positioning method combining time of arrival (TOA) and angle of arrival (AOA) based on block sparse Bayesian. The method mainly comprises the following five parts: received signal processing, region-of-interest division, over-complete dictionary construction, parameter iterative updating and posteriori mean value accumulation. Received signal processing is used for preparing for parameter iteration updating; the division of the region of interest is to construct an over-complete dictionary on a specific grid; the over-complete dictionary is constructed to provide a basis for parameter iteration updating in the next step; the parameter iterative updating is to recover a radiation source signal to obtain a posteriori mean value of the signal; posterior mean value accumulation is used for obtaining a likelihood estimation value of each grid point, and the index of the dictionary corresponding to the likelihood estimation value is the estimation position of the radiation source. Compared with DPD and BOMP methods, the method is higher in resolution and better in positioning performance, especially under the conditions of low signal-to-noise ratio and few snapshots.
Owner:NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
Mixed sound signal separation method, device, electronic device and readable medium
Owner:BEIJING DAJIA INTERNET INFORMATION TECH CO LTD
Data transmission method, device and system
ActiveCN106712917BEasy to receiveEfficient acquisitionError preventionNetwork topologiesEngineeringWireless lan
Disclosed are a data transmission method, apparatus and system, belonging to the technical field of data communications. The data transmission apparatus comprises: a processing unit for generating a data frame according to data to be transmitted, the data frame successively comprising: a low-rate (LR) preamble, a basic preamble, a high-efficiency wireless local area network (HEW) preamble and a data portion, the LR preamble comprising: a low-rate short training field (LR-STF), and the LR-STF comprising: at least two first symbols arranged in a time domain, wherein the content of each of the first symbols is the same, the period of a time domain waveform corresponding to the first symbols is 1.6 microseconds, and the LR-STF is used for timing synchronization; and a sending unit for sending the data frame to a receiving end. The present invention solves the problem of relatively poor reliability of data frame transmission, and improves the reliability of data frame transmission. The present invention is used for data transmission.
Owner:HUAWEI TECH CO LTD
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