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63 results about "Quantization (signal processing)" patented technology
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Quantization, in mathematics and digital signal processing, is the process of mapping input values from a large set (often a continuous set) to output values in a (countable) smaller set, often with a finite number of elements. Rounding and truncation are typical examples of quantization processes. Quantization is involved to some degree in nearly all digital signal processing, as the process of representing a signal in digital form ordinarily involves rounding. Quantization also forms the core of essentially all lossy compression algorithms.
Audio signal processing apparatus
Owner:JVC KENWOOD CORP A CORP OF JAPAN
Signal processing with look-ahead modulator noise quantization minimization
ActiveUS7196647B2Electric signal transmission systemsAnalogue conversionEngineeringQuantization (signal processing)
A signal processing system includes a look-ahead delta-sigma modulator that processes multiple output candidate vectors and an input vector to determine a quantization error vector for each output candidate vector. In one embodiment, the quantization error vector represents a difference between a cost value vector and an input candidate vector. Look-ahead delta-sigma modulator output values are selected using the quantization error vectors by, for example, determining the minimum power quantization error vector for each input vector X and selecting the output value from the input candidate vector associated with the minimum power quantization error vector. Quantization error vectors can also be weighted using a non-uniform weighting vector.
Owner:CIRRUS LOGIC INC
Compression sampling analog-to-digital converter using sampling and quantification circuit
ActiveCN105720987AReduce mismatchEliminate non-ideal factorsAnalogue/digital conversionElectric signal transmission systemsSignal restorationAnalog-to-digital converter
The invention provides a sampling and quantification circuit used for a compression sampling analog-to-digital converter and belongs to the field of mixed signal integration circuit design technology. According to the invention, a signal processing procedure including signal observation, error estimation, signal calibration and signal restoration for error correction and a sampling and quantification circuit realization structure with multi-way parallel sampling, simulation domain integration and signal quantization device quantification are provided. The sampling and quantification circuit realization structure successively inputs all simulation sampling and integration results into the same quantification device, so a mismatching problem in a multi-way quantification process is effectively reduced; complexity in realization of a compression sampling analog-to-digital converter system is reduced; and the sampling and quantification circuit is designed with modules, so independence and universality of designing of all modules are improved.
Owner:TSINGHUA UNIV
Coherent receiver
ActiveUS8515293B2Modulated-carrier systemsPolarisation multiplex systemsMultiplexingSignal processing
Owner:NEC CORP
Implementation method and device of forward calculation, storage medium and electronic device
PendingCN111931917ARelieve stressImprove computing powerNeural architecturesNeural learning methodsDigital signal processingQuantization (signal processing)
The invention provides an implementation method and device of forward calculation, a storage medium and an electronic device, and the method comprises the steps: obtaining a calculation parameter corresponding to forward calculation of a target neural network, the calculation parameter comprising at least one of the following: the structure of the target neural network and the weight of the targetneural network; executing a low-precision quantization process on the calculation parameters to obtain quantized data; and processing the quantized data through a digital signal processing (DSP) endto realize forward calculation of the target neural network. By adopting the technical scheme, the problems that the calculation performance cannot be effectively improved and the like due to limitedCPU calculation capability when the target neural network is calculated through a CPU in related technologies are solved.
Owner:ZHEJIANG DAHUA TECH CO LTD
Robustness digital watermark method based on chaotic mapping and singular value decomposition
InactiveCN102646260AImprove securityImprove robustnessImage data processing detailsSingular value decompositionPattern recognition
The invention belongs to the technical field of multimedia information security and particularly relates to a robustness digital watermark method based on chaotic mapping and singular value decomposition. The method comprises the following steps of: (1) a watermark embedding process, including the steps of: using the chaotic mapping for carrying out arrangement scrambling on n*n original images to obtain noise maps; blocking the noise maps subjected to the arrangement scrambling; carrying out singular value decomposition on each block to obtain a diagonal matrix, and embedding the watermark images into the maximum singular value of the corresponding block diagonal matrix one pixel by one pixel to complete the watermark embedding; and (2) a watermark detecting process, including the steps of: carrying out arrangement scrambling on watermark adding images by using the chaotic mapping; blocking the watermark adding images subjected to the arrangement scrambling; and carrying out singular value decomposition on each block to obtain a diagonal matrix, and using the diagonal matrix and a set quantization coefficient to obtain watermark images by calculation. The method provided by the invention has higher safety and better robustness, and the watermark embedded with images has higher robustness performance on image compression, image geometric distortion, image signal processing and the like.
Owner:SUN YAT SEN UNIV
One-bit signal single snapshot direction-of-arrival estimation method and related components
ActiveCN111781575ASimple structureLow costWave based measurement systemsComplex mathematical operationsRadar systemsData acquisition
The invention discloses a one-bit signal single snapshot direction-of-arrival estimation method and related components. According to the method, the characteristics of frequency modulation one-bit quantitative sampling and one-bit signal single-snapshot direction-of-arrival estimation are combined; echo signals received by the front end of an array radar system are firstly subjected to dechirpingprocessing and frequency shift processing, then frequency modulation one-bit quantization is carried out, AD sampling is carried out, and then direction-of-arrival estimation of a detected target is carried out in a signal processing system at the rear end of the array radar by adopting single sampling snapshot. One-bit quantitative sampling at the front end of the array radar is highly matched with single-snapshot direction-of-arrival DOA estimation of one-bit signals at the rear end of the array radar; the structure of an array angle measurement radar system can be simplified, the cost of data acquisition, transmission, storage and processing is reduced, the design complexity of the system is reduced, and the real-time processing capacity of the system is improved. Accurate one-bit signal single-snapshot direction-of-arrival estimation is realized, and the super-resolution direction-of-arrival estimation quality is improved.
Owner:SHENZHEN UNIV
Reversible robust watermarking method based on Zernike moment geometric attack resistance
ActiveCN111242831AResolve distortionEfficient extractionImage watermarkingPattern recognitionWatermark method
The invention discloses a reversible robust watermarking method based on Zernike moment geometric attack resistance. The method comprises the following steps: calculating a Zernike moment of an original image, carrying out watermark embedding by adopting a quantization watermark method, processing distortion information existing in a Zernike forward and reverse transformation process, and judgingwhether the image is attacked or not; when judging that the image is not attacked, extracting distortion information by adopting a reversible watermarking method, extracting a quantitative watermark by utilizing a Zernike moment of the image, and recovering the original image; and when it is judged that the image is attacked, calculating a Zernike moment of the attacked image with the watermark information, and performing quantitative watermark extraction to obtain the watermark information. According to the method, the problem that reversible robust watermarking cannot be achieved due to thefact that a large number of accumulative errors exist in the Zernike moment transformation process is solved, watermarking can be extracted and an original image can be recovered when the image is notattacked, watermarking can be effectively extracted when the image is attacked, and higher robustness is achieved for geometric attack and conventional signal processing.
Owner:JINAN UNIVERSITY
SDM encoder and related signal processing system
ActiveUS11303295B1Improve filtering effectAmplifier modifications to reduce non-linear distortionSignal processing for reducing noiseSoftware engineeringHemt circuits
A signal density modulation (SDM) encoder includes a first subtractor, a sigma circuit and a multi-bit quantizer. The first subtractor is used for receiving an input signal. The sigma circuit is coupled to the first subtractor. The multi-bit quantizer, coupled to the first subtractor and the sigma circuit, is configured to generate an output signal. The sigma circuit or the multi-bit quantizer produces a first feedback signal to the first subtractor. The first subtractor performs a subtraction operation according to the first feedback signal and the input signal, and generates a delta signal. The sigma circuit performs an operation on the delta signal, such that the SDM encoder has a noise transfer function having a high pass filtering effect. The noise transfer function is a ratio of a quantization error brought by the multi-bit quantizer with respect to the input signal. The output signal has more than two levels.
Owner:XMEMS LABS INC
Underwater glider-based underwater acoustic signal processing method
ActiveCN114513262AFlexible implementation of secondary discriminationIncrease widthCharacter and pattern recognitionRadio transmissionEnvironmental noiseNoise level
The embodiment of the invention discloses an underwater glider-based underwater acoustic signal processing method. The method comprises the following steps: acquiring an underwater acoustic signal; performing digital quantization on the underwater acoustic signal, and converting quantized data into underwater acoustic time domain data; performing calculation processing based on the obtained underwater sound time domain data to obtain corresponding result data; the result data comprises an environmental noise total noise level, an environmental noise spectrum level, sound pulse and abnormal noise reconnaissance information, target detection information, target tracking information, tracking target feature analysis information and target discrimination information; the processing result is sent to a far-end shore control system in a satellite communication interaction mode, so that the control of the shore control system on the underwater glider and the secondary judgment of a detection target are realized; the underwater acoustic signal processing method has the beneficial effects that various different types of result data are obtained by processing the acquired underwater acoustic signal, various functions are realized, and the application width and depth are improved.
Owner:浙江咸临智能科技有限责任公司
Digital signal modulation method of photon artificial intelligence computing chip
PendingCN113627604AReduce power consumptionImprove accuracyCharacter and pattern recognitionOptical analogue/digital convertersDigital signal processingEngineering
The invention discloses a digital signal modulation method for a photon artificial intelligence calculation chip, and the method comprises the following steps: S01, converting a to-be-recognized optical signal to a preset modal domain, enabling the to-be-recognized optical signal to enter a dispersion compensator, and enabling the dispersion compensator to apply a certain dispersion value to the signal; S02, extracting feature vectors from different modal domains of the to-be-identified signal by using a pre-trained heterogeneous neural network; s03, using a power generation module for mapping the pulse peak power of the input signal under a certain dispersion value to the average power of the output signal; s04, enabling a control and digital signal processing module to drive a dispersion compensator to generate a series of dispersion values; and S05, matching the dispersion-signal average power actual measurement array with dispersion-signal average power samples of various signals with known modulation formats. The method can be directly connected with digital signals of an electronic chip, and quantization errors generated when digital-to-analog conversion is carried out on the digital signals are avoided.
Owner:光子算数(苏州)智能科技有限公司
Bit plane noise reduction method and system based on singular spectrum analysis and storage medium
ActiveCN114118177AImprove noise reduction efficiencyRemove residual noiseCharacter and pattern recognitionSingular spectrum analysisAmplitude noise
The invention discloses a bit plane noise reduction method and system based on singular spectrum analysis and a storage medium, and relates to the technical field of signal processing, and the method comprises the steps: carrying out the singular spectrum analysis of an original signal, obtaining a signal component, and reconstructing the signal component; carrying out noise degree evaluation on the reconstructed signal; converting the reconstructed signal into a bit plane matrix; calculating a bit occupied by noise, and carrying out local amplitude noise reduction; and reducing each bit vector to a decimal representation to obtain a quantized signal, and performing smoothing processing on the quantized signal to remove a quantization error to obtain a final noise reduction signal. According to the invention, through adaptive noise reduction, the problems of noise residual of reconstructed signals, distortion of original signals and the like in a traditional singular spectrum noise reduction method are solved, and the efficiency of signal noise reduction is improved.
Owner:GUANGDONG UNIV OF TECH
Photon analog-to-digital conversion system and method based on hierarchical quantization principle
InactiveCN111045275AImprove bit precisionSimple structureOptical analogue/digital convertersSoftware engineeringOptical communication
The invention belongs to the technical field of signal processing of optical communication and particularly relates to a photon analog-to-digital conversion system and method based on a hierarchical quantization principle. The system comprises a mode-locked laser, a first optical beam splitter, a first electro-optical modulator, a second electro-optical modulator, a third electro-optical modulator, a signal generator, a first direct-current power supply, a second direct-current power supply, a third direct-current power supply, a second optical beam splitter, a third optical beam splitter, a fourth optical beam splitter, a coarse quantization module and a fine quantization module. By using the photon analog-to-digital conversion system and method based on the hierarchical quantization principle, compared with a traditional photon analog-to-digital conversion system, a coarse-fine two-stage quantization mode is used to realize exponential secondary growth of quantization stages on thebasis of a same number of MZMs so that bit precision of the analog-to-digital conversion system is greatly improved, and meanwhile, the system has characteristics of a simple structure, easiness in integration and the like.
Owner:HANGZHOU DIANZI UNIV
Narrowband millimeter wave MIMO channel estimation method under low-precision all-digital architecture
ActiveCN113242195AReduce computational complexityReduce the impact of estimating performanceRadio transmissionChannel estimationNoise (radio)Computation complexity
The invention relates to a narrowband millimeter wave MIMO channel estimation method under a low-precision all-digital architecture, which belongs to the field of wireless communication signal processing, and comprises the following steps: a sending end sends mutually orthogonal pilot signals; the receiving end radio frequency link performs low-precision quantization on the analog receiving signal to obtain a digital receiving signal; a millimeter wave MIMO channel estimation problem is converted into a noise-containing quantization sparse signal reconstruction problem by utilizing an existing angle domain millimeter wave MIMO channel model; firstly, an optimization problem is constructed by using a consistency reconstruction criterion, and a channel vector support set is estimated; dimensionality reduction processing is carried out on a reconstruction problem, so that the calculation complexity is reduced; conditional expectation of the received signal after sampling is further calculated to obtain maximum likelihood estimation of the received signal; and finally, least square estimation is performed on the millimeter wave MIMO channel. Compared with a traditional channel estimation method, the method has the advantages that customized design is carried out according to the sparsity characteristic of the millimeter wave MIMO channel in the angle domain, the estimation precision is higher, and the calculation complexity is lower.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Low-memory voice keyword detection method and system, medium, equipment and terminal
PendingCN112735469AReduce storageReduce memory requirementsSpeech analysisTheoretical computer scienceTerm memory
The invention belongs to the technical field of voice signal processing, and discloses a low-memory voice keyword detection method and system, a medium, equipment and a terminal. The method comprises the steps: performing pre-processing, time-frequency domain feature MFCC extraction, attention and time sequence convolution neural network model training on a voice signal; and performing dimension reduction on parameters of a full connection layer in a TACRNN model through the SVD technology, performing low-order quantization on dimension reduction parameters, and reducing the storage amount of model parameters needing to be stored. According to the method, SVD does not need to be carried out on original model parameters to compress the model parameters, the relevance between the model parameters is fully utilized, and the memory requirement for parameter storage is greatly reduced. The method is different from traditional methods that model parameters are represented by double-precision floating points; and on the basis of SVD dimension reduction on the model parameters, the compressed parameters are expressed by low bits, so that the memory requirement on the model parameters is reduced. The deployment capability of lightweight equipment for a voice detection algorithm is further enhanced and adapted.
Owner:XIDIAN UNIV
Quantification method and system based on neural network difference
ActiveCN110378466BLow bit compressionGuaranteed performanceCharacter and pattern recognitionNeural architecturesDigital signal processingEngineering
Owner:PEKING UNIV
Analog-to-digital conversion circuit and electronic equipment
PendingCN114337671AReduce areaHigh precisionAnalogue-digital convertersCapacitanceSoftware engineering
The invention relates to an analog-to-digital conversion circuit and electronic equipment, the analog-to-digital conversion circuit comprises a first conversion unit, a second conversion unit and a signal processing unit, the first conversion unit is used for performing coarse quantization on a first analog signal to obtain a first digital signal; the second conversion unit is used for performing fine quantization on the quantization residual error part of the first analog signal to obtain a second digital signal; the signal processing unit is used for obtaining a third digital signal according to the first digital signal and the second digital signal, wherein the third digital signal is a digital signal corresponding to the first analog signal; wherein the first conversion unit and the second conversion unit comprise at least one multiplexing module and do not comprise amplifiers and / or sampling capacitors which work in a closed loop mode. According to the analog-to-digital conversion circuit disclosed by the embodiment of the invention, low-speed and high-precision analog-to-digital conversion can be realized under an advanced process, and the area of the circuit is reduced.
Owner:TSINGHUA UNIV
Image noise reduction method based on complex quaternion wavelets
ActiveCN111325689AImprove noise reduction qualityImplement discretization methodsImage enhancementImage analysisColor imageImage manipulation
The invention discloses an image noise reduction method based on complex quaternion wavelets, and belongs to the technical field of image processing. According to the method, definitions of complex quaternion wavelet transform and inverse transform are provided, a corresponding discretization method is provided, and a feasible scheme is provided for solving the color distortion problem in the color image noise reduction process. The method comprises the following steps: representing a noise image by using a complex quaternion; carrying out complex quaternion wavelet transform processing; carrying out quantization threshold noise reduction; carrying out complex quaternion wavelet inverse transform processing; according to the invention, sub-band decomposition and reconstruction are carriedout on an image by using complex quaternion wavelet transform and inverse transform; according to the method, detail information and color information in the image are effectively represented, three color components of the color image are always processed as a whole in the whole implementation process, the problem of color distortion in the image noise reduction process is solved, the noise reduction quality is improved, and the method can be widely applied to the fields of image and signal processing and the like.
Owner:HUAIYIN TEACHERS COLLEGE
Low-power digital signal processing
ActiveUS11290106B2Power reduction by control/clock signalPulse generatorDigital signal processingBitwise operation
Systems and devices are provided to perform low-power digital filtering of sensor or other data based on bitwise operations. A reference sinusoid is encoded via a plurality of pulse trains, such that each pulse train includes a number of pulses n representing a value of the reference sinusoid out of a maximum possible pulses corresponding to an encoding quantization level. A circular register stores a representation of the encoded sinusoid. A set of multiple logical gate blocks are configured to multiply, via one or more bitwise operations, each of multiple bits of a received input signal with a pulse train corresponding to a value of the encoded sinusoid. A logic circuit coupled to the circular register and the set of multiple logical gate blocks is configured to generate, based on the encoded sinusoid and on the input signal, an output signal indicating an approximate value of the received input signal multiplied by the encoded sinusoid.
Owner:STMICROELECTRONICS SRL
Signal processing device, method and analog-to-digital converter
ActiveCN111654289BReduce the number of modulesReduce power consumptionAnalogue/digital conversionElectric signal transmission systemsSoftware engineeringAnalog signal
The invention provides a signal processing device, method and analog-to-digital converter. Wherein, the signal processing device includes: an input terminal for receiving an analog signal; a quantization module for converting the analog signal into a digital signal, and the digital signal includes a multi-digit digital output code; a randomization module for receiving the h-bit digital output code randomly flipped by thermal noise in the multi-bit digital output code, and using the h-bit digital output code to randomize the quantization path, where h is a positive integer.
Owner:上海奥令科电子科技有限公司
MIMO radar signal processing method and device, terminal equipment and storage medium
InactiveCN113126055AImprove filtering effectImprove radar performanceWave based measurement systemsTarget signalTerminal equipment
The invention is suitable for the technical field of radar signal processing, and provides an MIMO radar signal processing method and device, terminal equipment and a storage medium, and the method comprises the steps: obtaining a linear frequency modulation signal corresponding to a sampling point through an MIMO radar; performing autocorrelation and windowing processing on the linear frequency modulation signal in sequence to generate a target filtering coefficient corresponding to the linear frequency modulation signal; performing quantization processing on the linear frequency modulation signal and the target filtering coefficient to obtain a quantified linear frequency modulation signal and a quantified target filtering coefficient; and determining a target signal according to the quantified linear frequency modulation signal and the quantified target filtering coefficient. According to the method, the filtering effect of the chirp signal is improved through the filtering coefficient, the radar performance and the target detection efficiency are improved, and the development cost is reduced.
Owner:WHST CO LTD
A method for calculating the lower bound of gen-Cramero for cloud mimo radar based on quantitative data
ActiveCN108957422BReduce complexityWave based measurement systemsRadar signal processingQuantization (signal processing)
The invention discloses a method for calculating the root Cramero lower bound of cloud MIMO radar based on quantitative data, which belongs to the technical field of radar, and particularly relates to the calculation of the parameter estimation performance bound in radar signal processing. The technical problem solved by the present invention in view of the deficiencies of the background technology is to obtain the cloud MIMO radar joint target velocity and position parameter estimation based on quantitative data, using two processing methods of direct analysis and quantization and approximate analysis and quantization, and performing maximum likelihood estimation. , and computes the Cramero bound. The direct analysis quantization calculated by the method of the present invention and the Cramero bound when the quantization effect is approximated as a Gaussian error can be used to evaluate the performance of cloud MIMO radar joint target velocity and position parameter estimation, and the effect of quantization on performance is considered, This reduces the complexity of implementation and is closer to engineering applications.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Floating-point number FIR digital filter and design method thereof
ActiveCN112039495AReduce quantization errorDigital technique networkDigital signal processingVoltage pulse
The invention discloses a floating-point number FIR digital filter and a design method thereof, and belongs to the technical field of digital signal processing in a high-voltage pulse power supply system. The filter comprises a to-be-filtered data storage module, a filter coefficient storage module, a floating-point number conversion module, a first-in first-out memory module, a memory control module, a first random access memory, a second random access memory and a floating-point number multiply-accumulate module. The FIR digital filter based on floating-point number operation can be realized, the precision of a filtering result can reach the precision of a theoretical value calculated by MATLAB, compared with a traditional fixed-point number filter, the introduced quantization error is greatly reduced, and meanwhile, low-pass filtering can be carried out on a signal which is acquired in a high-voltage pulse power supply system and receives high-frequency interference, and a foundation is laid for subsequent signal monitoring and analysis.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA
Audio signal output device, audio system, and audio signal output method
ActiveUS11308968B2Reliable identificationSpeech analysisTwo-channel systemsElectronic controllerEngineering
An audio signal output device includes an audio signal acquisition unit configured to acquire audio signals of a plurality of channels, a first electronic controller, and an output unit. The first electronic controller includes a quantization bit expansion unit configured to expand the number of quantization bits of each of the audio signals to generate an expansion region for each of the audio signals, and an audio signal processing unit configured to generate an output signal in which the plurality of channels are downmixed such that an audio signal of at least one channel from among the plurality of channels is arranged at a reference bit position different from a reference bit position for an audio signal of a different channel of the plurality of channels, by using the expansion region. The output unit is configured to output the output signal.
Owner:YAMAHA CORP
Realization method of fpga based on threshold vector circle ofdm signal direct clipping technique
ActiveCN109347779BFast operationHighly integratedMulti-frequency code systemsCommunications systemLookup table
The invention belongs to the technical field of signal processing and communication systems, and discloses an FPGA implementation method based on the threshold vector circle OFDM signal direct clipping technology; the method of using a lookup table is used to realize direct clipping on the FPGA hardware platform, and the pre-calculated threshold The coordinates on the vector circle are stored in the ROM of the FPGA, and the ROM address is determined according to the tangent value of the signal phase, which reduces the computational complexity and reduces the delay at the sending end of the OFDM system under the premise of ensuring that the PAPR meets the index requirements, and only exists The quantization error of a table lookup. The invention only stores points on one-eighth of the vector circle, and other parts are obtained through triangular transformation, thereby reducing the use of ROM resources in the FPGA. The invention is applied to any communication system developed on the FPGA platform and using the OFDM transmission mode, and realizes the direct amplitude limitation of the signal under a small system overhead, so as to reduce the PAPR.
Owner:XIDIAN UNIV
Delta-sigma modulation-based analog signal quantization method and device
PendingCN113904687AImprove signal-to-noise ratioQuality improvementAnalogue conversionSoftware engineeringAnalog signal
The invention discloses an analog signal quantization method and device based on delta-sigma modulation, and belongs to the field of signal processing, and the method comprises the steps: carrying out the delta-sigma modulation of a to-be-transmitted analog signal, and obtaining a first digital signal; subtracting the first digital signal from an original analog signal to obtain a first differential signal; filtering out-of-band noise in the first differential signal, amplifying the first differential signal, and performing delta-sigma modulation to obtain a second digital signal; combining the first digital signal and the second digital signal into a path of digital signal to obtain a quantization result of the analog signal; dividing the quantization result of the analog signal into two paths of digital signals so as to restore a first digital signal and a second digital signal; subtracting the reduced first digital signal from the attenuated second digital signal to obtain a second differential signal; and filtering components outside the signal frequency band in the second differential signal so that the original analog signal is obtained through reduction. The technical problem that an existing analog signal quantization method is low in signal-to-noise ratio can be effectively solved.
Owner:HUAZHONG UNIV OF SCI & TECH
Encoder using coding tree unit level adaptive quantization mode to adjust frame level quantization parameter and associated signal processing method
ActiveUS20220303538A1Solve the real problemDigital video signal modificationEngineeringCoding tree unit
An encoder includes a frame level processing circuit, a coding tree unit (CTU) level processing circuit and an encoding circuit. The frame level processing circuit is arranged to calculate a bit number of a current frame according a target bitrate and a frame rate, and the frame level processing circuit is further arranged to calculate a quantization parameter of the current frame according to the bit number of the current frame and at least one parameter. The CTU level processing circuit is arranged to use an adaptive quantization mode to adjust the quantization parameter to generate an adjusted quantization parameter. The encoding circuit is arranged to encode the current frame to generate output data according to the adjusted quantization parameter.
Owner:REALTEK SEMICON CORP
A FPGA-based digital receiver system and radio frequency analog-to-digital conversion method
ActiveCN109088641BEnables direct RF analog-to-digital conversionAvoid lossAnalogue-digital convertersTransmissionDigital signal processingAnalog device
The invention discloses a digital receiver system based on FPGA and a radio frequency analog-to-digital conversion method. The system comprises a power distribution module, a reference signal generation module, a radio frequency analog-to-digital conversion module and a digital signal processing module. The radio frequency analog-to-digital conversion method comprises the following steps of: dividing a radio frequency signal in any frequency band into (n-1) paths; the digital reference signal generated by FPGA is filtered to obtain the analog reference signal. A digital signal is obtained by analog-to-digital conversion of a radio frequency signal in any frequency band. The direct RF analog-to-digital conversion of the analog signal can be realized by the RF analog-to-digital method. For RF signals of different frequency bands and different standards, the whole signal processing process from RF quantization to baseband demodulation is carried out in the digital domain of FPGA, which eliminates the analog local oscillator, mixer and IF filter, and effectively avoids the loss and distortion of analog devices.
Owner:SOUTH CHINA UNIV OF TECH
Demultiplexing algorithm of FBMC-OQAM mode division multiplexing system based on lattice reduction
PendingCN113067662AEliminate cyclic prefixImprove spectrum utilizationOptical mode multiplex systemsComputation complexityLattice reduction
The invention discloses a demultiplexing algorithm of an FBMC-OQAM mode division multiplexing system based on lattice reduction, and belongs to the technical field of communication. The algorithm comprises the following steps of: performing reduction processing on a non-orthogonal channel matrix H obtained by least square (LS) estimation to obtain a quasi-orthogonal matrix and a per-unit mode matrix T; and balancing the received signal by using the quasi-orthogonal matrix to obtain a left multiplication per-unit mode matrix T after quantization judgment, and realizing conversion between the left multiplication per-unit mode matrix T and the left multiplication per-unit mode matrix T to obtain an estimated value of a sent signal. According to the method, the equalization problem of a non-orthogonal channel matrix is converted into the signal processing problem of a quasi-orthogonal matrix through lattice reduction, so that the problem of channel matrix orthogonality degradation caused by MDL is solved, and the method has the characteristics of low calculation complexity and excellent bit error rate performance, has a better demultiplexing effect, and improves the damage compensation performance of an equalization algorithm.
Owner:JILIN UNIV
Accurate and efficient realization method and device of linear frequency modulation signal autocorrelation operation
ActiveCN110808935BCutting costsRealize simultaneous outputPhase-modulated carrier systemsDigital signal processingFilter (signal processing)
The invention discloses an accurate and efficient realization method and device for linear frequency modulation signal autocorrelation operation. The method includes: quantization step, buffer step, filter step and output step. Each unit of the device for accurately and efficiently realizing the autocorrelation operation of the linear frequency modulation signal corresponds to the method. The present invention provides an accurate and efficient implementation method and device for the autocorrelation operation of the chirp signal. The biggest feature of the method is to use the FIR filter bank to realize the autocorrelation operation of the chirp signal. The overall effect is parallel processing through the FIR filter The architecture can realize simultaneous output of autocorrelation results with different delays. The FIR filter can be realized by using the FFT algorithm, and the operation speed is relatively fast. The method also has the advantages that the processing signal is a digital quantity, the calculation accuracy is high and there is no drift; it is suitable for high-speed parallel multi-channel digital signal processing; the memory can be used efficiently, and in some application scenarios, the FIR filter bank can be stored in a memory such as ROM. coefficient, the implementation cost is small.
Owner:SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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