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78 results about "Semi blind" patented technology
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Ultra small microphone array
ActiveUS20070260340A1MicrophonesAmplifier modifications to reduce noise influenceFinite impulse responseTime domain
Methods and apparatus for signal processing are disclosed. A discrete time domain input signal xm(t) may be produced from an array of microphones M0 . . . MM. A listening direction may be determined for the microphone array. The listening direction is used in a semi-blind source separation to select the finite impulse response filter coefficients b0, b1 . . . , bN to separate out different sound sources from input signal xm(t). One or more fractional delays may optionally be applied to selected input signals xm(t) other than an input signal x0(t) from a reference microphone M0. Each fractional delay may be selected to optimize a signal to noise ratio of a discrete time domain output signal y(t) from the microphone array. The fractional delays may be selected to such that a signal from the reference microphone M0 is first in time relative to signals from the other microphone(s) of the array. A fractional time delay Δ may optionally be introduced into an output signal y(t) so that: y(t+Δ)=x(t+Δ)*b0+x(t−1+Δ)*b1+x(t−2+Δ)*b2+ . . . +x(t−N+Δ)bN, where Δ is between zero and ±1.
Owner:SONY COMPUTER ENTERTAINMENT INC +1
Semi-blind transmit antenna array device using feedback information and method thereof in a mobile communication system
InactiveUS7079867B2Short delay timeNot greatly changedEnergy efficient ICTRadio wave direction/deviation determination systemsSemi blindEngineering
There is provided a transmit antenna array device with at least two antennas and a method thereof in which a transmission beam is appropriately formed based on a weight vector to be transmitted to a specific mobile station in a mobile communication system. For this purpose, a base station device has a reverse processor for processing a reverse signal received through the antenna array, a forward fading information extraction unit for extracting forward fading information from the received reverse signal, a beam formation controller for generating a weight vector for formation of a transmission beam using the forward fading information and the received reverse signal, and a forward processor having a transmission beam generator for generating a transmission beam for a transmission message based on the weight vector. A mobile station device has a forward processor for processing a received forward signal, a forward fading estimator for estimating forward fading information of the forward signal for each path, a forwarding fading encoder for combining the estimated forward fading information and encoding the combined forward fading information, and a reverse processor for multiplexing the encoded forward fading information with a transmission message and feeding back the forward fading information in the multiplexed signal to a base station.
Owner:SAMSUNG ELECTRONICS CO LTD
Ultra small microphone array
ActiveUS7809145B2MicrophonesAmplifier modifications to reduce noise influenceFinite impulse responseTime domain
Owner:SONY COMPUTER ENTERTAINMENT INC +1
Robust acoustic echo cancellation for loosely paired devices based on semi-blind multichannel demixing
A method for echo cancellation in multichannel audio signals includes receiving a plurality of time-domain signals, including multichannel audio signals and at least one reference signal, transforming the time-domain signals to K under-sampled complex-valued subband signals using an analysis filter bank, and performing, for each of the K under-sampled complex-value subband signals, linear echo cancellation of the reference signal from each channel using an acoustic echo canceller. A probability of acoustic echo dominance is produced using a single-double talk estimator, and a semi-blind multichannel source separation is performed based on the probability and independent component analysis (“ICA”) to decompose the audio signals into a near-end source signal and a residual echoes using subband semi-blind source separation. The residual echo components are removed from the near-end source signal using a spectral filter bank, and the subband audio signals are reconstructed to a multichannel time-domain audio signal using a subband synthesis filter.
Owner:SYNAPTICS INC
Tracking device with sound emitter for use in obtaining information for controlling game program execution
A tracking device may include a body, a sound emitter operable to emit a sound, an array of two or more microphones adapted to produce discrete time domain input signals at a runtime, one or more processors coupled to the array of two or more microphones; and a memory coupled to the microphones and the processor. The memory has a set of processor readable instructions embodied therein. The instructions include one or more instructions for:determining a listening direction of the sound source relative to the microphone array from the discrete time domain input signals; using the listening direction in a semi-blind source separation to select filtering functions that separate out sounds from the sound emitter from the discrete time domain input signals; identifying a listening zone containing the sound emitter from the filtering functions; and determining a location of the sound emitter from the identified listening zone.
Owner:SONY COMPUTER ENTERTAINMENT INC
Tread for a light truck or automobile tire
InactiveUS6923232B1Reduce stiffnessLow bending stiffnessTyre tread bands/patternsNon-skid devicesSemi blindEngineering
A tread (12) for a light truck or automobile tire (10) has a continuous rib (30, 32) between an adjacent piece of circumferentially continuous grooves (20, 22, 24). The tread (12) has a plurality of hook-shaped semi-blind grooves (40) originating from the circumferentially continuous grooves (20, 22, 24). Each rib (30, 32) has two rows of circumferentially spaced hook-shaped semi-blind grooves (40).
Owner:THE GOODYEAR TIRE & RUBBER CO
Covariance matching-based multi-antenna spectrum sensing method
InactiveCN101986583AThreshold determination is convenientAccurately determineTransmission monitoringPattern recognitionFrequency spectrum
The invention discloses a covariance matching-based multi-antenna spectrum sensing method, which specifically comprises a semi-blind detection method and a complete-blind detection method. In the semi-blind detection method, a new detection amount is constructed by comparing a received-signal sampling covariance matrix with a known noise covariance matrix (herein, the noise covariance refers to noise variance, M refers to the number of receiving antenna, and I[M] refers to a M*M unit matrix); and in the complete-blind detection method, another new detection amount is constructed by the fact that the normalized sampling covariance matrix of a main signal is approximately equal to a diagonal matrix when the main signal does not appear. In the two methods of the invention, because of using correlation as the basis of decision amount of construction, the statistic characteristics of a master user signal and a transmission channel are not required to be known in advance; and especially fora complete-blind detection algorithm based on covariance matching, the spectrum sensing can effectively be implemented under the condition that the noise variance is unknown.
Owner:SOUTHEAST UNIV
Channel estimating method in MIMO-OFDM system
InactiveCN1801792ASave Spectrum ResourcesImprove spectrum utilizationBaseband system detailsRound complexityFrequency spectrum
Present invention discloses semi-blind channel estimation method in MIMO -OFDM system. It contains replacing original OFDM circulate prefixion to training sign to estimate channel. Transmitted-data is divided into training sign and data transmission OFDM sign, wherein training sign constituting fine self-correlation and poor cross-correlation sequence for substituting circulate prefixion, resisting ISI and ICI and establishing channel estimated initial parameter, data transmission OFDM sign composed of data sign channel estimate algorithm adopting Wiener's algorithm. Said invention has higher frequency spectrum efficiency and data-signalling rate and lower operating complexity.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Method and apparatus for multi-user code channel activation detection in wireless communication system
ActiveUS20060153142A1Improve performanceImplement detectionError preventionTransmission systemsMulti user detectionCommunications system
The present invention provides a method for detecting active code channels of multiple users in a wireless communications system. The method comprises the steps of: receiving the radio signals that contain the signals of at least two of said multiple users; separating the data and training sequences of said received radio signals; making channel estimation based on said separated training sequences to obtain the estimated channel response; obtaining, based on said estimated channel response, the active channel response windows; obtaining the allocated spreading codes to which said active channel response windows may correspond; determining, based on the estimated channel responses and the possible corresponding allocated spreading codes, the active spreading code channels corresponding to said active channel response windows; making multi-user detection in the determined active code channels. Thus the blind or semi-blind detection of the receiver is implemented.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Method and apparatus for collision resolution in a delay-critical radio telecommunications system
InactiveUS6895039B2Network traffic/resource managementTransmission control/equalisingMean squareSemi blind
In a PRACH channel, colliding signals are resolved by use of a number of training-like symbols in the colliding data payloads. The signals are estimated by spatio temporal filters running a training-based or semi-blind algorithm, and a selection criterion is applied to the estimated signals, such as distance from the finite alphabet or the mean square error.
Owner:LUCENT TECH INC
Semi-blind channel estimation method suitable for a large-scale MIMO system assisted by intelligent reflecting surface
ActiveCN112565121AExcellent bit error rateImprove Channel Estimation AccuracyChannel estimationMatrix decompositionComputation complexity
The invention belongs to the technical field of information and communication, and relates to a semi-blind channel estimation method suitable for a large-scale MIMO system assisted by an intelligent reflecting surface. In order to reduce the pilot overhead of a sending end and improve the channel estimation precision, the invention provides a semi-blind channel estimation method for Bayesian approximate message passing by solving the problem of trilinear matrix decomposition, i.e., only part of sequences in sending symbols are used as pilot symbols. According to the method disclosed by the invention, the maximum calculation overhead of each iteration is only the product operation of the matrix and the vector, the calculation complexity and expandability are relatively low, relatively accurate channel estimation can be obtained under the condition of a small number of pilot frequencies, and meanwhile, unknown symbol sequences of a part of sending ends are detected.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Pneumatic tire
ActiveUS20160039248A1Improve steering stabilityHigh normal stiffnessTyre tread bands/patternsNon-skid devicesSemi blindEngineering
Owner:SUMITOMO RUBBER IND LTD
Semi-blind transmit antenna array device using feedback information and method thereof in a mobile communication system
InactiveUS20050248497A1Short delay timeNot greatly changedEnergy efficient ICTSpatial transmit diversityMultiplexingSemi blind
There is provided a transmit antenna array device with at least two antennas and a method thereof in which a transmission beam is appropriately formed based on a weight vector to be transmitted to a specific mobile station in a mobile communication system. For this purpose, a base station device has a reverse processor for processing a reverse signal received through the antenna array, a forward fading information extraction unit for extracting forward fading information from the received reverse signal, a beam formation controller for generating a weight vector for formation of a transmission beam using the forward fading information and the received reverse signal, and a forward processor having a transmission beam generator for generating a transmission beam for a transmission message based on the weight vector. A mobile station device has a forward processor for processing a received forward signal, a forward fading estimator for estimating forward fading information of the forward signal for each path, a forwarding fading encoder for combining the estimated forward fading information and encoding the combined forward fading information, and a reverse processor for multiplexing the encoded forward fading information with a transmission message and feeding back the forward fading information in the multiplexed signal to a base station.
Owner:SAMSUNG ELECTRONICS CO LTD
Semi-blind channel estimation method for intelligent reflecting surface auxiliary communication system
ActiveCN113225276AReduce overheadHigh communication rateBaseband system detailsPassive radio relay systemsComplete dataData set
The invention discloses a semi-blind channel estimation method for an intelligent reflecting surface auxiliary communication system, which comprises the following steps that: firstly, a base station sends a corresponding intelligent reflecting surface reflection phase configuration signaling to an intelligent reflecting surface, wherein the intelligent reflecting surface is configured according to the signaling; a user sends a pilot symbol to the base station, and the base station performs initialization estimation on the cascade channel according to a received signal; then, the user sends a data symbol to the base station, and the data symbol is reflected to the base station through the intelligent reflecting surface; the base station firstly calculates a probability density function of a complete data set composed of a received signal and defect data, a log-likelihood function is solved for the probability density function, and by calculating cascade channel estimation when conditional expectation of the log-likelihood function is maximized, an accurate cascade channel estimation value is obtained through iteration. According to the invention, the cascade channel can be estimated by using fewer pilot signals, the pilot overhead of a large-scale intelligent reflector system is effectively reduced, and the communication rate of the system is improved.
Owner:SOUTHEAST UNIV
Gravel-blind minimum variance distortionless response beam forming method
InactiveCN101344582AHigh resolutionHigh precisionSpatial transmit diversityDirection findersSemi blindEuclidean vector
A semi-blind MVDR (minimum variance distortionless response) beams forming method belongs to the array signal processing field of a beam former receiving wireless signals. A group of direction vectors with corresponding maximum values sent out from a traditional beam former is adopted to form a minimum variance constraint matrix and define a semi-blind MVDR beam former response vector satisfying the linear constraint and minimum variance constraint; a signal DOA is estimated according to the DOA corresponding to the maximum value of a projection on the semi-blind MVDR beam former response vector by an array receiving vector; a residual vector is defined in virtue of the signal DOA and the array receiving vector and the residual vector is adopted to displace the array receiving vector to repeat the above steps and the repetition time equals the number of signals or the repetition is stopped when the residual signal is less than a certain value. The method realizes the high accurate and high resolution estimation to the DOA when the number of the array receiving vectors is less, thus realizing the high accurate beam forming.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Circularly-polarized planar substrate integrated magnetoelectric dipole antenna and array thereof
ActiveCN110380218AEnable direct integrationImprove scalabilityRadiating elements structural formsIndividually energised antenna arraysPlanar substrateSemi blind
The invention discloses a circularly polarized planar substrate integrated magnetoelectric dipole antenna and an array thereof. The antenna comprises a top metal layer, a first dielectric layer, a middle metal layer, a second dielectric layer, a third dielectric layer and a bottom metal layer which are sequentially arranged from top to bottom. A pair of L-shaped patches which are rotationally andsymmetrically arranged are arranged at the center of the top metal layer; the middle metal layer is a grounding layer, and a rectangular groove is etched in the middle metal layer; and the pair of L-shaped patches and the middle metal layer are electrically connected through a pair of metallized semi-blind holes penetrating through the first dielectric layer. The antenna carries out feeding through the low-profile microstrip feed structure, can be conveniently expanded into an array, and does not need to additionally arrange a dielectric layer to design a feed network. The ground antenna provided by the invention can obtain about 50% of impedance bandwidth, about 8% of 3dB axial ratio bandwidth and wider 3dB axial ratio beam width, and can realize direct integration with a millimeter waveradio frequency front-end circuit.
Owner:SOUTHEAST UNIV
Pneumatic tire
A pneumatic tire (1) has a tread pattern capable of improving wet performance and steering stability in a well balanced manner. An inboard middle land portion (7) is provided with inboard middle axial grooves (12) connecting between an inboard shoulder main groove (4) and an inboard crown main groove (6) and inclined at 20 to 30 degrees. An outboard middle land portion (8) is provided with outboard middle semi-blind grooves (14) extending axially inwardly from a outboard shoulder main groove (3), and outboard middle sipes (15) extending from the axially inner ends of the outboard middle semi-blind grooves (14) to the outboard crown main groove (5). The outboard middle semi-blind grooves (14) and the outboard middle sipes (15) are inclined at 20 to 30 degrees. A center land portion (9) is provided with inboard crown semi-blind grooves (16) extending from the inboard crown main groove (6), and outboard crown semi-blind grooves (17) extending from the outboard crown main groove (5).
Owner:SUMITOMO RUBBER IND LTD
Reference signal constraint-based mechanical characteristic acoustic signal frequency-domain semi-blind extraction method
ActiveCN104568132AWith non-contact measurementWith online testMachine part testingSubsonic/sonic/ultrasonic wave measurementSemi blindMechanical equipment
The invention relates to a reference signal constraint-based mechanical characteristic acoustic signal frequency-domain semi-blind extraction method, and belongs to the technical field of operation maintenance of mechanical equipment. The method comprises the following steps: constructing a multi-scale morphology filter for a failure signal characteristic on the basis of a dynamic particle swarm algorithm with higher global optimization capability, and maximally weakening background noise interference; constructing a reference signal in combination with structural parameters of a mechanical part, and further performing complex component blind separation band by band by virtue of a unit reference signal constraint semi-blind extraction method; solving order uncertainty problems to obtain a separated and restored source signal to finally realize the extraction and separation of the mechanical failure characteristic signal by virtue of the improved KL distance between complex components. Different from vibration monitoring requiring the mounting of a sensor on the surface of mechanical equipment, acoustic monitoring only requires the placement of 1 to 2 microphones around the equipment, and then the failure characteristic signal can be extracted from a picked up mechanical acoustic signal for further failure source positioning.
Owner:KUNMING UNIV OF SCI & TECH
Optimal forgetting factor-based semi-blind recursive least squared (RLS) channel estimation method
InactiveCN102158440AImprove solution efficiencySolve the problem of low estimation efficiencyBaseband system detailsComputation complexityMean square
The invention provides a semi-blind recursive least squared (RLS) channel estimation method, which is applied to a single input single output orthogonal frequency division multiplexing (OFDM) system. In the semi-blind RLS channel estimation method, an optimal forgetting factor can be rapidly acquired. In the method, mean square error performance in semi-blind RLS channel estimation is analyzed to obtain an accurate mean square error calculation formula, and an optimal forgetting factor value can be obtained by utilizing the mean square error calculation formula and a stepwise traversing searching algorithm, so the optimal forgetting factor can be rapidly obtained without a time-consuming emulation process. In the method, the optimal forgetting factor value can be flexibly changed according to signal to noise ratio condition and an autocorrelation function of a fading channel; therefore, the method is more widely applied, relatively lower in calculation complexity and relatively higher in realization efficiency, the optimal forgetting factor calculation efficiency is remarkably improved, and the problem of low semi-blind RLS channel estimation efficiency of the conventional single input single output OFDM system is solved.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Method and apparatus for multi-user code channel activation detection in wireless communication system
ActiveUS7554956B2Improve performanceGuarantee normal implementationError preventionFrequency-division multiplex detailsMulti user detectionCommunications system
The present invention provides a method for detecting active code channels of multiple users in a wireless communications system. The method comprises the steps of: receiving the radio signals that contain the signals of at least two of said multiple users; separating the data and training sequences of said received radio signals; making channel estimation based on said separated training sequences to obtain the estimated channel response; obtaining, based on said estimated channel response, the active channel response windows; obtaining the allocated spreading codes to which said active channel response windows may correspond; determining, based on the estimated channel responses and the possible corresponding allocated spreading codes, the active spreading code channels corresponding to said active channel response windows; making multi-user detection in the determined active code channels. Thus the blind or semi-blind detection of the receiver is implemented.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Communication system and method using subspace interference cancellation
A receiver performs interference mitigation under blind or semi-blind conditions using diversity present in the signal of interest or in the interferer. A first path interference mitigation procedure extracts training information from received signals, performs interference mitigation on the training information and estimates the channel. The second path interference mitigation procedure uses data extracted from the received signal and the channel estimate to perform interference mitigation. Each interference mitigation process can take the form of a lossy compression followed by decompression.
Owner:ACORN TECH INC
Semi-blind oversampling clock data recovery circuit with high locking range
ActiveCN103427830AIncrease lock rangeSimple structurePulse automatic controlLow-pass filterSemi blind
The invention discloses a semi-blind oversampling clock data recovery circuit with a high locking range, which is mainly used for improving the range of application of the semi-blind oversampling clock data recovery circuit and avoiding generating error code during excessive continuous word time data recovery. The semi-blind oversampling clock data recovery circuit comprises a receiver (1) composed of a multi-path parallel oversampling circuit (11) and a frequency detector FD (12), a data recovery and frequency phase control circuit (2) composed of a filtering and shaping circuit (21), an edge detection circuit (22), a data recovery circuit (23), a phase information circuit (24), a byte adjustment circuit (25) and a frequency / phase adjustment circuit (26), and a feedback circuit (3) composed of a multi-phase VCO (Voltage Controlled Oscillator) circuit (31), a LPF (Low Pass Filter) circuit (32) and an DAC (Digital to Analog Converter) circuit (33). Through the adjustment, the frequency of the sampling clock just can sample the input data, the locking is realized, and the clock data recovery is further accomplished.
Owner:NANJING UNIV OF POSTS & TELECOMM INST AT NANJING CO LTD
Cyclic prefix-based enhanced data recovery method
InactiveUS20100246730A1Easy to operateAmplitude-modulated carrier systemsAmplitude demodulationAlgorithmCyclic prefix
The cyclic prefix-based enhanced data recovery method retains the cyclic prefix (CP) upon reception and routes the CP to a data detection module to enhance the operation of the orthogonal frequency division multiplexed (OFDM) receiver whether operating in the blind, semi-blind, training, or perfectly known channel modes. Processing of the OFDM symbol and the CP is performed in the data detector and obtains data recovery by computing a maximum likelihood estimation based on the CP and the OFDM symbols.
Owner:KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
Autoclaved fly ash semi-blind porous brick and preparation method thereof
InactiveCN101597935AHigh hollow rateHigh compressive strengthSolid waste managementMixing operation control apparatusBrickSlag
The invention relates to an autoclaved fly ash semi-blind porous brick, which is characterized in that the centre of the brick is provided with two square hollow holes, a plurality of semi-blind round holes are arranged at the periphery of the two square hollow holes, and the hollow ratio of the brick is 30-35%; the brick comprises the components of fly ash, bottom slag, lime powder and fine sand, and the weight percentage of each component is as follows: 40-50% of fly ash, 30-35% of bottom slag, 5-12% of lime powder and 10-18% of fine sand. The invention further relates to a preparation method of the autoclaved fly ash semi-blind porous brick. The invention has the advantages of lower production cost of the brick and higher compressive strength, low dry shrinkage and preferable durability of the produced brick.
Owner:镇江盛华粉煤灰利用开发有限公司
Short wave area emergency mobile communication semi-blind frequency selection system and method thereof
InactiveCN106788475ASolve efficiency problemsSolve technical problems with poor concealmentReceivers monitoringSignal-to-noise ratio (imaging)Semi blind
The present invention provides a short wave area emergency mobile communication semi-blind frequency selection system and a method thereof. From the perspective of detection of communication fusion, the method comprehensively uses the wideband passive monitor and low signal to noise ratio detection technologies. First, a priori scanning frequency in an optimal work frequency is acquired based on full range passive monitoring, so as to prevent electromagnetic pollution caused by full range scanning, so that a basis is provided for bidirectional detection based on existing narrow band short wave radio. Further, the priori frequency is sensed proactively based on a portable short wave radio so as to select preferred frequency. The problems of low communication performance and poor concealment of high-power independent detection are solved, and the method can help improve the short wave area emergency mobile communication in the complex environment.
Owner:CHONGQING TELECOMMUNICATION INSTITUTE
Multi-path data signal joint judgment detection method
ActiveCN110233687AAccurate detectionAccurate extractionTransmission monitoringSemi blindSignal-to-quantization-noise ratio
The invention discloses a multi-path data signal joint judgment detection method, belongs to the technical field of signal detection in wireless communication, and provides a signal semi-blind detection method which is based on short-time Fourier transform and multi-channel diversity signal joint judgment under a short-wave channel, and is high in accuracy, and does not need channel prior information. Under the condition that a short wave channel only knows part of information of a sending end signal, the characteristics that the received multi-path signals carry the same information, statistics is independent and fading is irrelevant are utilized, and accurate detection and extraction of the signals can be achieved by applying a short-time Fourier transform means and a multi-path signal joint judgment method. Simulation results show that the algorithm can effectively and accurately detect the starting and ending positions of the signal under low signal-to-noise ratio and multipath frequency selective fading channels, and a detection effect superior to that of an energy entropy ratio detection method is obtained.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Communication system and method using subspace interference cancellation
A receiver performs interference mitigation under blind or semi-blind conditions using diversity present in the signal of interest or in the interferer. A first path interference mitigation procedure extracts training information from received signals, performs interference mitigation on the training information and estimates the channel. The second path interference mitigation procedure uses data extracted from the received signal and the channel estimate to perform interference mitigation. Each interference mitigation process can take the form of a lossy compression followed by decompression.
Owner:ACORN TECH INC
Fast-convergence semi-blind equalization method
InactiveCN102255834AGood convergence accuracyFast convergenceTransmitter/receiver shaping networksBlind equalizationAlgorithm
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA
Semi-blind hole forge piece hole-shrinking forging method
ActiveCN108213294AImprove fatigue resistanceExtended service lifeMetal-working apparatusSemi blindIngot
The invention provides a semi-blind hole forge piece hole-shrinking forging method. According to the semi-blind hole forge piece forging method, a traditional tool is used for achieving the forge piece hole-shrinking process by changing the deformation process of a material and controlling deformation. The method mainly comprises the following steps of (1) flattening the tail of an ingot and cutting a dead head flat; (2) conducting upsetting; (3) punching a hole with a solid punch pin; (4) broadening the hole through a mandrel until the big-diameter end of a traditional common core rod can penetrate into a blank to be drawn out; (5) drawing out the traditional common core rod to form a preformed blank; (6) erecting the blank to conduct upsetting and smoothening the end faces of the blank;(7) conducting hole-shrinking forming; and (8) conducting surface finishing. Through the method, raw materials are saved; the cost of the raw materials is lowered; the machining allowance is reduced;the machining time is shortened; the production efficiency is improved; consumption during the production process is reduced; the internal metal structure and metal flow line at the intersection of steps of an inner hole of a forge piece are improved, and a continuous metal fibrous structure of the forge piece is maintained after machining; the anti-fatigue performance of the forge piece is improved, and the service life of the forge piece is prolonged.
Owner:HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
half-blind channel estimation method based on an EVD-ILSP
ActiveCN109818887AImprove frequency band utilization efficiencyAvoid estimation errorBaseband system detailsRadio transmissionDecompositionEstimation methods
The invention discloses an half-blind channel estimation method based on an EVD-ILSP The invention relates to a half-blind channel estimation method of an ILSP (International Link Station Protocol), which mainly solves the problem of channel estimation error caused by using a limited number of sample data in the traditional half-blind channel estimation method. The implementation scheme is as follows: 1) enabling a target cell base station to receive a data signal and a pilot signal and solves a covariance matrix of the data signal; 2) performing eigenvalue decomposition on the covariance matrix by adopting an EVD algorithm, and calculating a channel estimation value with ambiguity; 3) using the target cell base station to receive the pilot signal of each user to solve the ambiguity factorestimation value so as to obtain the initial channel estimation value of the target cell; and 4) according to the results of the step 2) and the step 3), obtaining a final channel estimation value byusing an ILSP algorithm. According to the method, the frequency band utilization efficiency of the system is improved, the channel estimation error caused by receiving the data signal by the limitedsample is reduced, and the method can be used for performing channel estimation between the base station signal and the user in a multi-cell multi-user large-scale MIMO system.
Owner:XIDIAN UNIV
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