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225 results about "Bandwidth (signal processing)" patented technology
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Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies. It is typically measured in hertz, and depending on context, may specifically refer to passband bandwidth or baseband bandwidth. Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a band-pass filter, a communication channel, or a signal spectrum. Baseband bandwidth applies to a low-pass filter or baseband signal; the bandwidth is equal to its upper cutoff frequency.
Method and system for detecting and classifying the modulation of unknown analog and digital telecommunications signals
InactiveUS7428270B1Accurate classificationHigh precisionModulation type identificationAmplitude-modulated carrier systemsSignal classificationCarrier signal
Disclosed is a unique system and method for recognizing the type of modulation embedded in an unknown complex baseband signal, comprising a receiver section for extracting the complex baseband signal from a modulated signal having a carrier frequency, and comprising an orderly series of signal processing functions for (a) estimating the bandwidth of the unknown signal, (b) removing the out-of-band noise and correcting gross carrier frequency errors, (c) discriminating between constant envelope and irregular envelope signals, (d) estimating and correcting residual carrier frequency errors, (e) classifying a constant envelope signal into one of the following modulation formats: {Continuous Wave (CW), Frequency Modulation (FM), Frequency Shift Keying (FSK)}, and (f) classifying an irregular envelope signal into one of the following modulation formats: {Amplitude Modulation (AM), Double Sideband Suppressed Carrier (DSB-SC), Binary Shift Keying (BPSK), Quaternary Phase Shift Keying (QPSK), π / 4-shifted QPSK, M-ary PSK (MPSK), and OTHER classes}.
Owner:HER MAJESTY THE QUEEN & RIGHT OF CANADA REPRESENTED BY THE MIN OF IND THROUGH THE COMM RES CENT
Modular wide-range transceiver
ActiveUS20050221764A1Easy to insertEfficiently and economically calibratingTransmitters monitoringResonant long antennasMicrowaveTransceiver
The present invention provides a method, apparatus, and processor instructions for wide-range microwave communications. In an exemplary embodiment, a wide-range transceiver is made having pre-calibrated modular units including an IF radio processing card, an RF transmitter module, and an RF receiver module. Calibration factors are loaded into a memory (e.g., EEPROM) in each module during production. Certain additional calibration factors may also be loaded upon installation, such as a one time calibration for the type and length of cable connecting the RF unit to a remote SPU (signal processing unit). A processor in the RF unit is responsive to control signaling indicating a desired transmitter or receiver configuration (e.g., a particular frequency, bandwidth and modulation), to attenuate the signal in the transmitter / receiver path based on the predetermined calibration factors from the applicable modules. A method for calibrating the modules is also disclosed.
Owner:HARRIS STRATEX NETWORKS
Grain graininess and concentration measuring method and device thereof
InactiveCN101135626ADecay GranularityReduce concentrationMaterial analysis using sonic/ultrasonic/infrasonic wavesParticle size analysisObservational errorMeasurement device
The measuring device comprises a computer used for data process, a signal process circuit connected to the computer, a pulse wave transmitting / receiving circuit connected to the signal processing circuit; a bandwidth transmitting / receiving transducer assembly connected to the pulse transmitting / receiving circuit. The data process program compares the measuring signal with the preset standard substance; the actually measured acoustic attenuation spectrum is combined with the acoustic attenuation spectrum obtained based on the scattering formula computational theory to construct the matrix and linear equation; using dual frequency attenuation ratioing to realize the calculation of average particle size; according to the particle size, inversely computes the particle concentration.
Owner:UNIV OF SHANGHAI FOR SCI & TECH
Wideband digital frequency selecting and radiating pulling system and signal processing method thereof
InactiveCN101521893AAchievement distanceRich networking methodsActive radio relay systemsNetwork planningBroadbandEngineering
The invention provides a wideband digital frequency selecting pulling system, wherein a DAU diplexer in DAU, a DAU wideband digital downlink, a DAU photoelectric conversion subsystem, a DAU wideband digital uplink, and a DAU diplexer are connected in sequence; a DAU power subsystem and a DAU monitoring subsystem are respectively connected with the DAU wideband digital downlink and the DAU wideband digital uplink; the DRU photoelectric conversion subsystem in DRU, a DRU wideband digital uplink, a DRU diplexer, a DRU wideband digital downlink, and a DRU photoelectric conversion subsystem are connected in sequence; and a DRU monitoring subsystem and a DRU power subsystem are respectively connected with the DRU wideband digital uplink and the DRU wideband digital downlink. The invention also provides a signal processing method which is achieved by adopting the system. The invention can reduce the use of analog devices and realize the bandwidth digital frequency radiating pulling system with different bandwidth.
Owner:COMBA TELECOM SYST CHINA LTD
Signal reconstruction technical scheme for sampling with rate lower than Nyquist rate
InactiveCN101867387AAvoid time costReduce computing costTransmitter/receiver shaping networksFilter (signal processing)Digital filter
The invention relates to a signal reconstruction technical scheme for sampling with rate lower than nyquist rate. The signal reconstruction scheme comprises the following steps of: firstly, solving a transformation basic matrix (signals x to be reconstructed thereon are sparse on the transformation basic matrix), modulating the transformation basic matrix with a cutting sequence, filtering by means of a digital filter, sampling the filtered signals, then generating compressive sensing arithmetic operators, and finally obtaining reconstructed signals by solving an optimized problem through the sparse inverse transformation. The invention aims to provide the signal reconstruction technical scheme for sampling with rate lower than the Nyquist rate, satisfy the needs for people in solving the contradictions between the increasingly widening signal bandwidth as well as the increasingly quickening sampling frequency and the requirements for reducing processing time and various costs reduce the signal sampling frequency and data transmission and storage cost, further remarkably shorten the signal processing time and reduce the computational expense, and accurately reconstruct signals.
Owner:NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
Digital closed loop type optical fiber current sensor
ActiveCN101957399AHigh sensitivityImprove dynamic rangeCurrent/voltage measurementVoltage/current isolationCurrent transducerNoise level
The invention provides a digital closed loop type optical fiber current sensor. A modulation signal of a light wave phase modulator of a sensor optical path system is an amplitude modulation square wave; a signal processing system extracts any harmonic wave of amplitude modulation square wave current output by a photoelectric transducer and extracts tested current information from the current; a pre-amplifier of the signal processing system is a transimpedance amplifier TIA, and the bandwidth is below 1 / 650 when the square wave transient amplitude value (prior art) is directly extracted from the amplitude modulation square wave, so that thermal noise output by the pre-amplifier and the shot noise level are also reduced to be below 1 / 650 of the prior art; and current-voltage conversion gain of the transimpedance amplifier TIA is not determined by the resistance of a feedback network of the TIA, so that a low-resistance resistor is adopted in the feedback network of the TIA while the high current-voltage conversion gain is ensured, and the thermal noise of the resistor which accounts for a significant proportion in the level of the noise output by the TIA is reduced to be negligible.
Owner:CHINA ELECTRIC POWER RES INST +1
Photoinjection-type chaotic photonic integration device and preparation method thereof
InactiveCN102882127AReduce volumeReduce manufacturing costSemiconductor laser arrangementsLaser arrangementsPhotonic signal processingEngineering
The invention discloses a photoinjection-type chaotic photonic integration device and a preparation method thereof. The photoinjection-type chaotic photonic integration device is characterized in that a principal distributed feedback semiconductor laser generates continuous wave laser, and the laser enters a passive waveguide after being amplified by a semiconductor optical amplifier, and then is injected into a subordinate distributed feedback semiconductor laser. Chaotic laser of a bandwidth can be generated by the subordinate distributed feedback semiconductor laser by adjusting the central wavelength between the semiconductor optical amplifier and the principal distributed feedback semiconductor laser as well as the subordinate distributed feedback semiconductor laser. According to the invention, photonic integration can be realized by injecting light into the semiconductor laser to generate the chaotic laser of the bandwidth, so that the chaotic laser performance is improved, the device size is greatly reduced, the stability of the system is improved, and the method has a simple process flow, is low in implementation cost, and has a broad application prospect in the future field of optical communication and photonic signal processing.
Owner:DALIAN UNIV OF TECH
Preprocessing modules for quality enhancement of MBE coders and decoders for signals having transmission path characteristics
InactiveUS6912496B1Improve performanceClose to speech qualitySpeech analysisFrequency spectrumLinear filter
Pursuant to one aspect of the invention, a prefilter module that incorporates an inverse filter is used in conjunction with an encoder. The inverse filter has an inverse frequency response of a frequency response of a filter that simulates speech having transmission path characteristics, such as telephone-channel bandwidth speech, and / or noisy speech. The inverse filter is used to compensate transmission path characteristics of an input signal. The inverse filter can be designed using several methods, such as, for example, an autoregressive model or a moving average model. Pursuant to a second aspect of the invention, a parameter preprocessor is used in conjunction with a decoder. The parameter preprocessor performs pitch rectification through use of a medium and linear filter, and updates spectral amplitudes and voicing parameter depending on the pitch rectification. The inverse filter and parameter preprocessor, used in conjunction with an encoder and decoder, respectively, improve signal processing and parameter estimation.
Owner:NYTELL SOFTWARE LLC
Device for measuring arm length difference of fiber optic interferometer
PendingCN108827601AImprove stabilityHigh measurement accuracyTesting optical propertiesTesting fibre optics/optical waveguide devicesFiber couplerPolarization-maintaining optical fiber
The invention relates to a device for measuring the arm length difference of a fiber optic interferometer, and mainly solves a problem that a measurement system employing an optical interference method is not high in stability and is low in measurement precision. The device provided by the invention comprises a narrow linewidth laser, a polarization-maintaining fiber coupler, a phase modulator, apolarization state controller, an acousto-optic frequency shifter, a fiber coupler, a to-be-tested fiber optic interferometer, a photoelectric detector, a frequency spectrograph, a signal processing and display module and a microwave signal generator. The device carries out the interference in microwave domain through a double optical frequency comb, and measures an interference signal by using the frequency spectrograph. The device can obtain the arm length difference of the to-be-tested fiber optic interferometer by the bandwidth of the interference signal in one cycle, and can achieve the measurement of the precision changes through changing the frequency interval of the optical frequency comb, thereby improving the measurement accuracy and the stability of the system, and ironing out the defect that a method employing optical interference cannot achieve the measurement of the arm length difference. The device is simple in workflow is simple and is high in generalizability.
Owner:苏州维创度信息科技有限公司
Dual-wavelength superheterodyne-interference wide-range high-precision real-time displacement measuring system and method
ActiveCN107192336ALarge rangeImprove real-time performanceUsing optical meansSignal processing circuitsPolarizer
The invention discloses a dual-wavelength superheterodyne-interference wide-range high-precision real-time displacement measuring system and method. The system is composed of two lasers between which the wavelength difference is deltalambda, three polarization splitting prisms, four splitting prisms, two acousto-optic modulators, four 1 / 4 waveplates, five planar mirrors, three Polaroids, a super-narrowband filter plate, two large-bandwidth transimpedance photoelectric detectors, two low-bandwidth high-sensitivity photoelectric detectors, a reference reflector, a measured reflector, a signal processing circuit and a host computer. According to the invention, a synthesized wavelength interference signal generated by dual wavelengths is used to improve the measuring range of the system, so that the measuring range of the system is greater than the range of single-wavelength interference; a superheterodyne interference method is used to demodulate and filter output signals, the phase of the synthesis wavelength can be measured directly, and real-time measurement is realized; and the super-narrowband filter plate is used to collect single-wavelength interference signals, and the precision of single-wavelength interference measurement is ensured while the measuring range is widened.
Owner:ZHEJIANG UNIV
Signal Acquisition System Having Probe Cable Termination in a Signal Processing Instrument
ActiveUS20110074389A1Electrical measurement instrument detailsElectrical testingCapacitanceSoftware engineering
A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable with the signal cable coupled to a signal processing instrument via an input node. The input node is coupled to an input current amplifier via input circuitry. The input circuitry provides at least one of resistive and capacitive termination of the resistive center conductor signal cable. The termination of the resistive center conductor signal cable in the signal processing instrument provides a signal acquisition system where the capacitive loading of a device under test at higher frequencies is reduced by reducing the input capacitance of the probe tip circuitry resulting in an increase in the signal acquisition system bandwidth.
Owner:TEKTRONIX INC
Signal Acquisition System Having Reduced Probe Loading of a Device Under Test
ActiveUS20110074392A1Improve flatnessSpectral/fourier analysisResistance/reactance/impedenceAudio power amplifierElectrical conductor
A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable. The resistive center conductor signal cable of the signal acquisition probe is coupled to a compensation system in a signal processing instrument via an input node and input circuitry in the signal processing instrument. The signal acquisition probe and the signal processing instrument have mismatched time constants at the input node with the compensation system having an input amplifier with feedback loop circuitry and a shunt pole-zero pair coupled to the input circuitry providing pole-zero pairs for maintaining flatness over the signal acquisition system frequency bandwidth.
Owner:TEKTRONIX INC
Digital downconverter with variable bandwidth and implementation method thereof
InactiveCN102098004AFlexible configurationEasy to handleMulti-frequency-changing modulation transferenceSoftware engineeringHemt circuits
The invention belongs to the field of electronics, and discloses a digital downconverter with variable bandwidth. The digital downconverter comprises a path switching circuit, a narrow-band filter group and a wide-band filter, wherein the path switching circuit is used for selecting a proper processing path for signals in accordance with configuration of parameter configuration modules; the narrow-band filter group is used for processing input narrow-band signals based on the structure of the digital downconverter; and the wide-band filter is used for processing input wide-band signals or the output of the narrow-band filter group based on a multiphase filter structure. The invention also provides an implementation method of the digital downconverter with variable bandwidth. The digital downconverter with variable bandwidth integrates the advantages of a traditional digital downconverter structure with a single channel and the advantages of the multiphase filter structure into a whole, thus implementing high efficient and high-speed processing on input intermediate-frequency signals, and being capable of flexibly configuring signal processing bandwidth within a larger range.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Signal Acquisition System Having a Compensation Digital Filter
ActiveUS20110074391A1Maintaining flatness over the signal acquisition system frequency bandwidthError preventionElectrical testingElectrical conductorAudio power amplifier
A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable. The resistive center conductor signal cable is coupled to a compensation system in a signal processing instrument via an input node and input circuitry in the signal processing instrument. The signal acquisition probe and the signal processing instrument have mismatched time constants at the input node with the compensation system having an input amplifier with feedback loop circuitry and a compensation digital filter providing pole-zero pairs for maintaining flatness over the signal acquisition system frequency bandwidth.
Owner:TEKTRONIX INC
Synchronous acquisition processing card system based on multi-channel ADC and FPGA
InactiveCN111736517AMulti-sample rateA large amountProgramme controlComputer controlComputer hardwareIntermediate frequency
The invention discloses a synchronous acquisition processing card system based on a multi-channel ADC and an FPGA. The synchronous acquisition processing card system comprises a clock management unit,a plurality of ADC chips, two FPGA chips, a plurality of groups of DDR3 chips and a power distribution network. The clock management unit generates multiple paths of synchronous sampling clocks and reference clocks, and the ADC chips are used for collecting and converting intermediate frequency signals accessed by an SMP. In the present invention, the invention relates to the technical field of ultra-high-speed data acquisition and processing. The sampling clock management unit provides sampling clocks and reference clocks required by synchronous sampling of multiple ADCs, it is convenient for expansion of ADC channel numbers. ADC+FPGA+DDR3 construction is adopted to complete data acquisition, processing, and caching, so that the synchronous acquisition processing card system has the advantages of being large in synchronous acquisition channel number, large in data storage capacity, high in processing capacity, wide in data transmission bandwidth and the like, and the market requirement of array signal processing for multi-channel synchronous data acquisition can be met.
Owner:CHENGDU SIMATE SCI & TECH
Extended bandwidth digital Doherty transmitter
ActiveUS8837629B2Resonant long antennasAmplifier modifications to raise efficiencyFrequency changerCarrier signal
An extended bandwidth digital Doherty transmitter includes a baseband signal processing block including a digital predistortion unit. It also includes a digital signal distribution unit and a digital phase alignment unit, a signal up-conversion block, an RF power amplification block including the carrier amplifier and one or two peaking amplifiers; and an RF Doherty combining network. In another aspect, a digital Doherty transmitter includes a baseband signal block including a digital predistortion unit, a digital signal distribution unit and an adaptive digital phase alignment unit. In this aspect a signal up-conversion block includes three digital-to-analog converters (DACs) and a tri-channel up-converter or three single-channel up-converters. There is also an RF power amplification block including the carrier amplifier and two peaking amplifiers, and an RF Doherty combining network which includes quarter wavelength impedance transformers.
Owner:GHANNOUCHI FADHEL M
Signal Acquisition System Having Reduced Probe Loading of a Device Under Test
ActiveUS20110074390A1Improve flatnessNegative-feedback-circuit arrangementsResistance/reactance/impedenceElectrical conductorEngineering
A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable. The resistive center conductor signal cable of the signal acquisition probe is coupled to a compensation system in a signal processing instrument via an input node and input circuitry in the signal processing instrument. The signal acquisition probe and the signal processing instrument have mismatched time constants at the input node with the compensation system providing pole-zero pairs for maintaining flatness over the signal acquisition system frequency bandwidth.
Owner:TEKTRONIX INC
Transient electromagnetic signal-to-noise separation method based on variational mode decomposition principle
ActiveCN110850482ARealize transient electromagnetic signalsAchieve separationElectric/magnetic detectionAcoustic wave reradiationFrequency spectrumNoise
The invention relates to the technical field of transient electromagnetic signal processing in geophysical exploration, and discloses a transient electromagnetic signal-to-noise separation method based on a variational mode decomposition principle, which is suitable for electromagnetic data filtering in a time domain. The method comprises the following steps: decomposing noisy transient electromagnetic data s(t) into K intrinsic mode functions uk(t); performing Hilbert transform on each intrinsic mode function to obtain a unilateral frequency spectrum; demodulating the frequency spectrum of each intrinsic mode function uk(t) to a corresponding base band according to the unilateral frequency spectrum, calculating a demodulated L2 norm, and calculating the bandwidth of the decomposed intrinsic mode function to obtain a constraint variation model; introducing a secondary penalty factor alpha and a Lagrange multiplication operator lambda, and converting the constraint variation model intoa non-constraint variation form; and calculating an optimal solution in a non-constraint variation form to obtain a series of optimized intrinsic mode components after VMD decomposition. The method solves the problem that transient electromagnetic data collected in geological interpretation is interfered by noise, is simple and convenient, has excellent noise separation and amplitude maintaining performance, can extract noise images, and provides conditions for subsequent noise analysis.
Owner:JILIN UNIV
Broadcast signal processing method, system, and receiver
InactiveCN101212642AImplement conditional access servicesConvenient and flexible managementAnalogue secracy/subscription systemsSelective content distributionRadio broadcastingData stream
Owner:BEIJING WATCH DATA SYST
Audio signal processing
Owner:KONINKLJIJKE PHILIPS NV
SPR neural synaptic device based on a-SiOx memristor effect and preparation method thereof
ActiveCN109037442AHigh bandwidthLarge signal processing bandwidthElectrical apparatusSynaptic weightEngineering
The invention provides a SPR neural synaptic device based on a-SiOx memristor effect and a preparation method thereof, belonging to the technical field of biomimetic devices. The invention combines K9glass prism with 'top electrode / a-SiOx: metal nanoparticle double resistive layer / bottom electrode' memristor structure coupling, so the optical signal is allowed to be injected into the double resistive layer through the K9 glass prism under the electric modulation, A surface plasmon resonance (SPR) effect is utilize to read that dielectric constant change information of the resistive layer during the working process of the device, thereby realizing the optical read of the synaptic weight of the device. The 'electrically modulated, optically read' synaptic device of the invention has the advantages that the traditional 'electrically modulated, electrically read' synaptic device cannot be compared with, because the synaptic device not only has the characteristics of low energy consumptionand non-volatility of the traditional memristor, but also has the advantages of large signal processing bandwidth and strong electromagnetic interference resistance when the light is used as an information carrier.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Signal processing method for use in an array antenna system in CDMA mobile telecommunications network and recording medium therefor
InactiveUS20010021181A1Spatial transmit diversityTime-division multiplexBeam patternCommunication quality
The present invention is a signal processing method for use in a CDMA adaptive array antenna system, the method for forming the beam pattern by maximizing a transceiving gain in a direction toward a target mobile station and optimizing the beam pattern in a moving direction depended on a moving direction of each target mobile station during signal transceiving between a base station and the mobile station, the method forming an ideal beam pattern by a simplified computation procedure, and a computer readable recording medium for storing a program for implementing the method. The method comprises determining signature of gradient of output power of the array antenna to the phase of each antenna, updating the phase of each antenna by increasing or decreasing the phase by an adaptive gain depending on the signature of the corresponding gradient, determining weight corresponding to the updated phase, and applying the weight to a signal arrived at each antenna. The present invention increases significantly communication capability per cell and improve communication quality for a given bandwidth.
Owner:HANTEL +1
High-sensitivity ultrasonic detection method based on digital optical frequency comb and microcavity array
InactiveCN111721839ARealize sensor detectionFast sweeping speedProcessing detected response signalEngineeringOptical communication
The invention belongs to the field of optical signal processing and the field of sensing, and relates to a high-sensitivity ultrasonic detection method based on a digital optical frequency comb and amicrocavity array. An advanced signal processing technology in the field of optical communication is utilized to obtain a digital optical frequency comb signal with a certain bandwidth, and the digital optical frequency comb signal is utilized to scan a micro-cavity photonic device to obtain an ultrafast and high-precision micro-cavity resonance peak scanning spectral line. Meanwhile, only one light path system is required to be coupled with the plurality of micro-cavity structures, so that the equal-interval wavelength distribution of the resonance peaks of the plurality of micro-cavities isrealized. Wavelength positions of resonance peaks of a plurality of micro-cavities are designed; rapid and high-precision detection of the frequency and the power of respective resonance peaks of thelarge number of micro-cavity structures by the digital optical frequency comb can be realized; the efficiency and the processing difficulty of ultrasonic array detection can be remarkably improved; the method can be applied to the fields of ultrasonic array detection, photoacoustic imaging and the like; and meanwhile, a basis is provided for research of an integrated and miniaturized ultrasonic phased array detector.
Owner:SUN YAT SEN UNIV
High-speed coaxial digital access system
InactiveCN101312403AReduce duplication of investmentGood economic and social benefitsData switching by path configurationNetwork managementSerial port
The invention provides a high-speed coaxial digital access system, which is mainly formed by a hardware system and a software system, wherein the hardware adopts an IXP420 processor of the INTEL company and externally connects a Flash and a SDRAM via an address / data bus to form a processor small system, adopts a data interface to control a 4-channel signal processing unit (EN3011) to integrate the received / sent signals of a signal receiving and sending unit (EN1010) to provide the data bandwidth required by users, the utility model utilizes an Ethernet switching unit to provide device data access and device maintenance, provides a serial interface for the device maintenance, and provides a network management unit for real-timely monitoring the device operation state, the performance and the like and deploying and maintaining the device in real time, and the software system can realize automatic search to join in a network management system, and can realize configuration management, security management, fault management, performance management and remote update, thereby effectively realizing the integration of three networks.
Owner:SHENZHEN JETNET TECH
Frequency segmentation channel equalization method
ActiveCN105610748ASave storage spaceImproved cancellation performanceTransmitter/receiver shaping networksCommunications systemRadar systems
The invention belongs to the array signal technology, and relates to a method of equalizing unmatched channels in a certain bandwidth. The channel equalization method comprises the following steps: 1, a frequency domain equalization filter is converted into an N-point filter, and N is selected to be the least power no smaller than L, and the N-point frequency feature e<N><O> of the frequency domain equalization filter is solved; 2, each section filter coefficient for segmented equalization is solved; and 3, the eN is used for carrying out equalization processing on a baseband complex signal xA of the to-be-equalized channel, and a complex signal sequence xAE after equalization is obtained. The storage space needed by channel equalization can be reduced, the cancellation performance between channels is improved, the array processing performance is thus enhanced, and requirements of multichannel array signal processing by a modern communication system, a phased array radar system and the like can be met.
Owner:LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
Optical fibre transducer general purpose high speed waveguide wavelength scanning demodulation process and apparatus
The key of the general and high speed waveguide wavelength scan demodulating method is to apply periodical scanning voltage signal on a tunable waveguide filter to make the reflected wavelength vary periodically and to realize the scan of spectrum. The initial reflection wavelength, bandwidth, reflectivity and other parameters of the tunable waveguide filter are designed based on the required light source wavelength and demodulation precision of the demodulator; and the filter wavelength scanning range, scanning frequency and other parameters are controlled through altering the amplitude andfrequency of the driving electric signal for the modulator. The equipment consists of light source, fiber optical path, tunable waveguide filter, which comprises single-mode light waveguide, Bragg grating and modulator, and detecting and signal processing device with intelligent distinguish function.
Owner:CHONGQING UNIV
Integrated structure of coherent channelized receiver
ActiveCN111525963ALower requirementImprove signal-to-noise ratioElectromagnetic receiversSoftware engineeringBand-pass filter
The invention discloses an integrated structure of a coherent channelized receiver. The integrated structure comprises a laser generation module, a first optical frequency comb generation module, a second optical frequency comb generation module, a suppression carrier single sideband modulation module, an I / Q optical mixing module, two parallel optical filter modules and a plurality of I / Q electric coupling modules. According to the invention, the microwave photon technology is utilized, and compared with the traditional channelization equipment utilizing electric signal processing, the structure can reduce the radio frequency interference; by utilizing a single sideband modulation mode of inhibiting carrier waves, the processable bandwidth is improved, symmetrical mirror image componentsgenerated by interaction of signals and original carrier waves are prevented from being generated, the requirement on an optical band-pass filter is reduced, the integration of an optical filter is facilitated, and meanwhile, the signal to noise ratio of output signals is improved. According to the invention, the structure of the carrier suppression single-sideband modulator is optimized, the sizeis reduced, and the precision is improved; through the integration of the main body optical path, the volume of the receiver is reduced, and the practicability and reliability of the channelized receiver are improved.
Owner:SOUTHEAST UNIV
Efficient pre-distortion method for 100MHz signal bandwidth power amplifier
ActiveCN112787601AControl Linearization BandwidthTo achieve the purpose of linearization compensationAmplifier modifications to reduce non-linear distortionHigh level techniquesFilter (signal processing)Data signal
The invention discloses an efficient pre-distortion method for a 100MHz signal bandwidth power amplifier, and belongs to the technical field of wireless communication. According to the pre-distortion method, only part of output signals of a power amplifier (PA) are subjected to linear compensation, and a multi-phase DPD structure is adopted; an intelligent signal processing module is added in a digital pre-distortion system, the intelligent signal processing module sets the number of half-band filters according to a to-be-compensated DPD linearization bandwidth, calculates ADC undersampling factors and the number of multi-phase DPD branches in combination with source signal parameters, and performs correlation calculation on an undersampling signal and an output signal of the DPD to obtain time delay; therefore, alignment of two data signals during parameter training is ensured. According to the invention, the DPD data throughput and the feedback loop sampling bandwidth can be reduced in a linkage manner at the same time, the DPD data throughput can be flexibly set, and the hardware implementation cost of the DPD is saved.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Microwave photon broadband receiver
ActiveCN112448771AFast receive processingReduce demandElectromagnetic transmittersElectromagnetic receiversUltra-widebandLocal oscillator signal
The invention discloses a microwave photon broadband receiver which is characterized in that 2n frequency multiplication modulation is carried out on an optical carrier outputted by a laser through afirst photoelectric modulator, the frequency of a modulation signal is 1 / 2n of that of a microwave local oscillator signal omega L, and a pair of optical local oscillators with the frequency difference of omega L is obtained through filtering processing of an optical wave trap; a radio frequency signal omega RF received by the antenna is modulated to the optical local oscillator through the secondphotoelectric modulator after passing through the low-noise amplifier, and then enters the photoelectric detector to be converted into an intermediate frequency electric signal omega IF after being processed by the optical filter; a medium-frequency band-pass filter is used for further filtering, and digital signal processing is carried out in an acquisition processing module. Down-conversion receiving processing of cross-band ultra-wideband microwave signals can be achieved, meanwhile, the requirements for large bandwidth, ultra-flexibility, soft programmable control and the like are met, and wide application prospects are achieved in the fields of high-speed communication and radar electronic countermeasures in the future.
Owner:BEIJING HUAHANG RADIO MEASUREMENT & RES INST
System and method for sensitive photon detection
ActiveUS20060243909A1Increase the number ofImprove overall system performance parameterMaterial analysis by optical meansPhotometry using electric radiation detectorsDigital signal processingSignal quality
A sensitive photon detection system generates an electronic photon sensor signal as a K factor times a number N photons per unit time. The system is configured by combining a separate optical amplifier with a gain factor K1 with a photo detector with a gain factor K2 such that K may be realized as the product of K1 and K2. The values of K1 and K2 are chosen to meet a predetermined K while optimizing a signal quality of the photon sensor signal. The optical amplifier may be preceded by a photon gathering device and / or a light chopping device to further optimize system performance. Further, the photon sensor signal may be further processed analog circuitry or may be digitized and processed using digital signal processing to generate an enhanced photon sensor signal with enhanced signal quality by adding gain and / or bandwidth limiting.
Owner:SOUTHWEST RES INST
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