233 results about "Pulse shaping" patented technology

An apparatus and method are provided to correct for time-walk errors during photon detections (e.g., detecting gamma rays). A time-walk correction is determined using measurements of energy (or charge) that apply different time windows, enabling corrections accounting for variations in the ratio between fast and slow components in the detected pulse. For example, one time window can be used to integrate the leading end of the pulse, thereby predominantly measuring the fast component, while a second window is used to integrate a trailing end of the pulse to predominantly measure the slow component. Alternatively or additionally, low-pass and high-pass filters may select the slow and fast components, respectively. The time-walk correction is a function of multiple measurements representing different components (e.g., fast and slow) of the pulse shape.

The invention belongs to the technical field of laser pulse modulation, and particularly relates to an ultrafast laser multi-pulse sequence preparation device and method. According to the invention, ultrafast pulse laser is divided into a transmission light path and a reflection light path through a beam splitter, a spatial light modulator is utilized to perform programming control on a target pulse in the transmission light path, and amplitude and pulse width parameters can be controlled while multiple pulse strings are generated; and the light path of the reflection light path is controlled through the high-precision one-dimensional displacement table, so that the time delay of a reflection light path pulse relative to a transmission light path pulse is controlled. And after the reflected light path and the transmission path subjected to pulse shaping are combined again, a periodic pulse string sequence with controllable time delay, pulse number, pulse width parameter and pulse intensity is realized. The problem that high-precision multi-pulse dynamic programming cannot be achieved through a traditional adjusting mode is solved, and the problems that in the prior art, the number of excitation pulses and pulse width parameters cannot be controlled at the same time, and an ordered periodic pulse sequence cannot be generated are solved.

The invention discloses a system and method for generating, regulating and controlling a partially coherent space-time light field. The system comprises a pulse shaping assembly composed of a plurality of optical elements and an incident light source used for providing a completely coherent ultrafast pulse light field. An optical element in the pulse shaping assembly comprises a first blazed grating, a first cylindrical lens, a two-dimensional dynamic holographic modulator, a second cylindrical lens and a second blazed grating which are sequentially arranged in the light field propagation direction. The focal lengths of the first cylindrical lens and the second cylindrical lens are the same, and the distance between the adjacent optical elements is equal to the focal lengths of the first cylindrical lens and the second cylindrical lens; the two-dimensional dynamic holographic modulator is used for loading a specific complex amplitude modulation function to reconstruct the spatial-spectral characteristics of the light field. According to the invention, the two-dimensional space-spectrum function of the pulse is dynamically modulated, the generation of the partially coherent space-time wave packet is realized, and the amplitude and structure distribution of the space-time coherence can be designed and regulated as required.

Systems and methods are described for generating and implementing pulse-shaping filters for efficient utilization of limited spectral resources in wireless communication systems. Wireless communication systems operating at high spectral efficiency conventionally use pulse shaping filters that rely on Nyquist waveforms for good main lobe performance with low inter-symbol interference (ISI) power. Conventional uses of non-Nyquist waveforms typically involve an orthogonalization process to convert those non-Nyquist waveforms to Nyquist waveforms for ISI free performance. Embodiments of pulse shaping filters described herein generate a non-Nyquist partial response (NNPR) transmit filter and / or matched receive filter based on applying a tunable second-weighted orthogonalization to a tunable first-weighted non-Nyquist waveform to obtain a pulse-shaping waveform with parametric control over throughput and power penalty.

Aspects presented herein provide a low PAPR waveform design based on resource spreading, pulse shaping, and / or dynamic MCS configuration, such that a transmitting wireless device may set IBO of its PA closer to the saturation point of the PA to enhance the PA efficiency. In one aspect, a first network node receives waveform information from a second network node, where the waveform information includes at least one of: one or more first parameters associated with a first waveform type or one or more second parameters associated with a second waveform type. The first network node processes data based on the one or more first parameters associated with the first waveform type or the one or more second parameters associated with the second waveform type. The first network node transmits a waveform based on the processed data, where the waveform is the first waveform type or the second waveform type.

The invention provides a phase-sensitive optical time domain reflectometer system and method, and the system comprises a first polarization-maintaining coupler which is used for dividing laser generated by a DC laser, and obtaining first laser and second laser; the optical fiber measurement front-end module is used for processing the random signal through pulse shaping and multi-carrier modulation technologies to generate an electric signal, and sequentially performing modulation, amplification, Rayleigh scattering and amplification on the first laser after the electric signal is generated to obtain amplified Rayleigh backscattered light; the second polarization-maintaining coupler is used for dividing the second laser to obtain third laser and local oscillation light; the delay optical fiber is used for processing the third laser to obtain delay light; the third polarization-maintaining coupler is used for combining the delayed light and the amplified Rayleigh backscattered light to obtain combined light; the receiver is used for processing the combined light and the local oscillation light to obtain multiple paths of target electric signals; and the oscilloscope is used for processing multiple paths of target electric signals through low-pass and high-pass filters and a phase noise compensation algorithm so as to determine power and phase distribution. The system cost can be reduced.

The invention relates to the technical field of power system state monitoring, and discloses an insulator defect detection method and device and a storage medium, and the method comprises the steps: collecting the leakage current of an insulator, and constructing a polarity conduction screening model through power frequency phase information, so as to generate a composite current sequence which highlights the polarization attribute of an interface; analyzing the nonlinear degree of the attenuation rate of the sequence drifting along with evolution time in a multi-stage diffusion evolution time domain, and generating an interface electrochemical mass transfer composite index; utilizing the index to invert and construct an interface polarization background reference and stripping the interface polarization background reference from the composite current sequence so as to extract an abnormal discharge pulse residual error; and finally, quantizing the pulse form distortion degree of the residual error, and performing suppression normalization operation on the distortion degree by using the index to output a judgment result. According to the invention, the interference of the interface mass transfer process is effectively eliminated, and the specific detection of the pollution flashover hidden danger is realized.

The invention discloses a traditional Chinese medicine pulse diagnosis instrument based on multi-modal analysis and a detection method thereof.The device is composed of a shell, a master controller and three sets of pulse diagnosis components used for the cun pulse position, the guan pulse position and the chi pulse position, and each pulse diagnosis component integrates an air path sensing module, an optical sensing module and a pressure sensing module; through cooperative work of the pneumatic piston, the liquid annular bag, the thin film pressure sensor and the optical sensor, accurate collection of pulse signals is completed. The system has the automatic locating and fitting function of three-dimensional linkage of the y axis, the theta axis and the z axis, intelligent locating and layered pressurization of wrist pulse positions can be achieved, and the pulse taking manipulation of'lifting, pressing and searching 'of traditional Chinese medicine is simulated. The device synchronously obtains multi-mode signals such as pulse position, pulse rate, pulse law, pulse shape and pulse potential, and after general control filtering, correction and fusion algorithm processing, a standardized feature matrix is formed and input into a multi-mode fusion model for pulse condition classification and automatic dialectical analysis. According to the device, a visual analysis result is generated based on pulse condition characteristics in combination with eight-line syndrome differentiation and viscera syndrome differentiation.

The utility model discloses a wide-field Fourier transform hyperspectral imaging device and system, and the device comprises a microscope assembly which is disposed at one side of an imaging sample, and is used for carrying out the focusing amplification imaging of the imaging sample, and then outputting corresponding first signal light; the input end of the pulse shaping assembly is arranged corresponding to the output light path of the microscope assembly, and the pulse shaping assembly is used for modulating and shaping the first signal light output by the microscope assembly and then outputting an interference signal of the whole imaging sample; the input end of the imaging detection assembly is arranged corresponding to the output light path of the pulse shaping assembly, and the imaging detection assembly is used for focusing, imaging and detecting the interference signals, output by the pulse shaping assembly, of the imaging sample at different spatial positions, converting the interference signals into a plurality of electric signals and outputting the electric signals. The utility model aims to improve the scanning speed of the imaging sample.

The present invention discloses a method for forming a secondary edge-shaped flat-top pulse, which is used to perform secondary edge-shaped flat-top pulse shaping on the high-order pulse signal output by the front-end analog system of a nuclear radiation detector. Starting from the decomposition of the system function and combining the progressive construction process of the pulse signal in the time domain and the z domain, this method overcomes the limitations of previous pulse shaping based on low-order typical pulse signals, which ignores the "high-order" and "complex" nature of the physical system. The rich characteristics of the formed secondary edge-shaped flat-top pulse are beneficial to the adoption of high-performance analysis algorithms (such as deep learning, etc.) in pulse recognition and overlapping pulse decomposition, and are conducive to greatly improving the accuracy of energy spectrum measurement.

The invention discloses a radar communication integrated waveform design method based on an OFDM (Orthogonal Frequency Division Multiplexing) signal. The method comprises the following steps that: a transmitting end completes constellation mapping on transmitted communication information, performs ZCT matrix reconstruction, performs serial-parallel conversion on reconstructed communication data, performs spectrum shaping on an integrated signal by adopting an improved Nyquist pulse, and transmits the integrated signal to a receiving end; and then IFFT processing, parallel-to-serial conversion, cyclic prefix addition, digital-to-analog conversion and up-conversion are carried out on the shaped data, and finally integrated waveform emission is completed. And the receiving end performs down-conversion, analog-to-digital conversion and cyclic prefix removal operation on the received signal. In the communication function, serial-to-parallel conversion, FFT processing, inverse pulse shaping, parallel-to-serial conversion, ZC matrix reconstruction solution and inverse mapping are carried out on the data without the cyclic prefix to obtain communication information. In the radar detection function, radar signal processing is performed on data without cyclic prefixes. According to the method, the correlation of OFDM integrated signals can be effectively optimized, the modulation characteristic of communication information is improved, the influence of the communication information on a fuzzy function is reduced, OFDM symbols have better correlation, meanwhile, the peak-to-average power ratio of the system is effectively reduced through pulse shaping, implementation is easy, and the comprehensive performance of the system can be remarkably improved.

The utility model belongs to servo driver technical field especially relates to a kind of servo driver non-polarity pulse input filter circuit, the circuit is by pulse input module, isolation and level conversion module, primary pulse shaping logic flip module, primary filter module, secondary controllable filter module, secondary pulse shaping logic flip module and MCU pulse collection and filter control module constitute, the utility model is by being arranged bridge rectifier circuit to make circuit not limit the polarity of signal input, reach the effect of arbitrary polarity input.

The invention relates to a spread spectrum underwater acoustic communication coding and decoding method, which comprises the following steps of: performing dual-channel coding modulation, sequentially performing CRC (cyclic redundancy check) coding, serial-parallel conversion, multi-system error correction coding and interleaving operation on an information bit stream at a transmitting end, then performing spread spectrum modulation on a code element by using a pseudorandom sequence, and finally mapping modulation output of an I channel and a Q channel into a baseband signal, and a spread spectrum underwater acoustic communication signal is formed through pulse shaping and up-conversion processing. According to the method, the communication accuracy is improved through a dual-channel incoherent and coherent redundancy decoding mode and an opportunity cross validation decoding mode.

The invention discloses a construction method of a non-acceleration PST Airy wave packet, and relates to the technical field of non-diffraction beams. The method comprises the following steps: defining Lorentz acceleration of a light beam in a PST domain; lorentz acceleration is applied to the light beam of the PST domain parabola-shaped frequency spectrum; superposing a cubic phase on the parabolic frequency spectrum of the PST domain; a non-acceleration PST Airy wave packet is generated by using a complex amplitude modulation method based on a spatial light modulator. Compared with a space-time light pulse scheme needing a pulse laser source, a 4f pulse shaping system and a complex field scanning device, the method achieves efficient generation of the wave packet through simplified configuration.

The application discloses a kind of pulse shaping method and system of nuclear signal, belong to signal processing technical field, for the problems of existing pulse signal width in prior art Widening, thereby increasing the accumulation event, and there is no better anti-noise effect to Gaussian white noise, the present application includes: the output signal of detector is acquired, and output signal is structured into digital function signal;The Z transform is carried out after the discrete of the digital function signal, and output Z transform signal is obtained;Definition input signal is exponential signal, and the Z transform is carried out to the exponential signal, and input Z transform signal is obtained;According to the input Z transform signal and the output Z transform signal, the transfer function of input signal pulse shaping is obtained;The inverse Z transform is carried out to the transfer function, and the pulse shaping signal of input signal is obtained, and its time domain expression.The purpose is: the pulse shaping signal obtained has better signal-to-noise ratio, and it is convenient to obtain amplitude.

A method and apparatus for wireless communication and storage medium are provided. The apparatus includes at least one processor; and memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: determine a guard band width associated with a symbol based on information about resource allocation to the apparatus; set a pulse-shaping parameter associated with the symbol based on the guard band width; and output the symbol having a waveform based on the pulse-shaping parameter.

The application relates to a satellite communication transmission method and device. The method of the application is applied to a sending end and comprises the following steps: encoding source data, and framing the coded output data based on an agreed subframe structure; performing symbol mapping processing on the framed output subframes to generate a first baseband signal; performing pulse shaping processing to obtain a second baseband signal; performing up-conversion and digital-to-analog conversion processing on the baseband signal to obtain an analog signal meeting the emission frequency point requirement and the sampling rate requirement, and performing emission; the subframe structure comprises a frame header synchronization sequence, a characteristic sequence used for carrying modulation mode information and coding mode information, a data load sequence and a frame tail synchronization sequence; the frame header synchronization sequence, the characteristic sequence, the data load sequence and the frame tail synchronization sequence are arranged in sequence, and the end of each sequence is sequentially inserted with a symbol pilot, and each symbol pilot constitutes a unique word sequence used for realizing a preset function. The application is beneficial to improving communication stability.

1. The name of the design product: digital multi-channel pulse amplitude analyzer. 2. The use of the design product: the main use of the design product is to provide high voltage for the detector, to provide working voltage for the preamplifier, high-precision signal processing and pulse shaping, high-speed data transmission, etc. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: front view.

A system includes an inverter including: a first galvanic isolator separating a low voltage area from a high voltage area, the first galvanic isolator having a first galvanic isolator output path; a second galvanic isolator having a second galvanic isolator output path; an amplifier connected to the first galvanic isolator via the first galvanic isolator output path, and connected to the second galvanic isolator via the second galvanic isolator output path, the amplifier having a first amplifier output path and a second amplifier output path; a comparator connected to the amplifier via the first amplifier output path and the second amplifier output path, the comparator having a first comparator output path and a second comparator output path; and a pulse reshape and envelope detector connected to the comparator via the first comparator output path and the second comparator output path.

The invention discloses an optical frequency comb generation device and method based on a 3 * 3 optical fiber coupler, and the device comprises a single-frequency microwave source, a phase shifter, a continuous wave laser, an intensity modulator, a phase modulator, a first connection optical fiber part, and a second connection optical fiber part. The microwave signal output end is connected with the intensity modulator or the phase modulator; the continuous wave laser comprises a laser signal output end, and the laser signal output end is connected with the intensity modulator; the intensity modulator and the phase modulator are connected with the input end of the non-linear optical annular mirror through the first connecting optical fiber part, the output end of the non-linear optical annular mirror is connected with the second connecting optical fiber part, and the non-linear optical annular mirror comprises a 3 * 3 optical fiber coupler and a non-linear optical fiber which are coupled; a 3 * 3 optical fiber coupler is adopted to form a nonlinear optical annular mirror, ultra-short pulse shaping is achieved through the interference effect between two paths of reverse transmission light fields, continuous wave background noise and pulse base side lobes are effectively eliminated, and through the design of an optical fiber coupling mode and a loop port connection mode and the selection of an input end and an output end, ultra-short pulse shaping is achieved. And the nonlinear chirp part of the pulse waveform is greatly inhibited, and the linear characteristic of the nonlinear chirp part is kept, so that the ultra-wideband optical frequency comb light source with remarkable spectral balance is realized in the high nonlinear parameter mixing process.

A power supply modulator circuit includes a multi-output power supply that generates multiple power output signals; at least one power modulator circuit generates a modulated power output signal from the multiple power output signals of the multi-output power supply; at least one pulse shaping network (PSN) having at least one passive element, the PSN configured to shape the modulated power output signal; at least one power amplifier coupled to receive the modulated power signal; and a switching network having a plurality of switches to create or modify power signal paths from the at least one power modulator circuit to the at least one power amplifier.

Systems and methods for pulse shaping voltage transitions in envelope tracking systems are provided. In one aspect, a radio frequency module includes a power amplifier configured to receive a radio frequency input signal and a voltage source. The power amplifier further configured to amplify a radio frequency input signal using the voltage source to generate an output radio frequency signal. The radio frequency module further includes a multi-level switch modulator configured to receive an envelope signal indicative of an envelope of the radio frequency input signal and generate the voltage source based on the envelope signal at one of a plurality of discrete voltage levels. The multi-level switch modulator is further configured to generate the voltage source using an analog component during transitions between discrete voltage levels and a digital component following the transitions.

Clock data recovery system with: a feedforward equalizer configured to equalize a first input signal received from an analog-to-digital controller based on a plurality of received tap coefficients, thereby producing a first output signal; an adder configured to add the first output signal and a feedback signal from a decision feedback equalizer, thereby producing a second output signal; a double limiter configured to receive the second output signal and provide a first group of preliminary decisions to a decision feedforward equalizer, the decision feedforward equalizer providing an equalized output signal; a second adder configured to generate a first error signal based on the equalized output signal from the decision feedforward equalizer, wherein the plurality of received tap coefficients are based on the error signal; and a clock data recovery circuit configured to receive the first output signal and provide a setting signal for the analog-to-digital controller.

A substrate processing method of transcribing, in a combined substrate in which a first substrate and a second substrate are bonded to each other, a device layer formed on a surface of the second substrate to the first substrate is provided. A laser beam is radiated in a pulse shape from a rear surface side of the second substrate to a laser absorption layer formed between the second substrate and the device layer.

This invention provides a pulse shaping technique that can yield a pulsed laser having a smaller energy fluctuation than that of a conventional pulse shaping technique using one or two non-linear optical crystals. A pulse shaping device includes: a non-linear optical crystal group including at least three non-linear optical crystals arranged side by side on an optical path of an input pulsed laser.

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate than a 4G system such as LTE. A method in which a base station transmits a signal by using a time offset in a time-asynchronous non-orthogonal multiple access (TA-NOMA) system, according to an embodiment of the present disclosure, comprises the steps of: checking a first bit stream for a first terminal, and a second bit stream for a second terminal; determining a time offset for the second terminal on the basis of the number of terminals operating in the TA-NOMA system and a pulse shape used in the TA-NOMA system; and transmitting a first signal corresponding to the first bit stream and a second signal corresponding to the second bit stream on resources that are allocated based on the time offset.

Methods and apparatus for characterizing an optical fiber link by optical time domain reflectometry are disclosed. In order to solve the problem of trade-off among signal-to-noise ratio, duration and resolution of optical time domain reflectometry, the embodiment of the invention uses a coded return-to-zero optical pulse sequence. Each return-to-zero light pulse in the coded sequence includes a guard interval to mitigate the effects of pulse shape distortion. In some embodiments, the return-to-zero light pulse sequence is encoded with a complementary Gaulay correlation code. Some embodiments provide methods for encoding and decoding a sequence in a return-to-zero pulse sequence. Some embodiments provide an optical time domain reflectometry apparatus including a light source unit, an optical coupler, a light sensor, and a processing device.

An optical system includes an optical source and a pulse shaping waveguide segment in optical communication with the optical source. The optical source is configured to generate a frequency modulated (FM) coherent waveform having a periodic phase profile. The pulse shaping waveguide segment shaping waveguide segment includes a plurality of subsegments. Each of the subsegments has a prescribed dispersion profile and length such that an overall group velocity dispersion (GVD) of the pulse shaping waveguide segment reduces a phase function of the FM coherent waveform in frequency space to provide an output of optical pulses. A waveguide structure may be in optical communication with the pulse shaping waveguide segment. The waveguide structure includes a plurality of alternating segments of normal dispersion (ND) waveguide segments and anomalous dispersion (AD) waveguide segments along a length of the waveguide structure to cause supercontinuum spectral generation of optical pulses traversing the waveguide structure.

The invention relates to the field of environment monitoring and analyzing instruments, and particularly discloses a portable radon detector which comprises a silicon photomultiplier sensor unit, a low-noise preamplifier unit, a comparator circuit and an STM32 main control module. By adopting the EQR-15 series silicon photomultiplier, the 300 [mu] m epoxy resin protective layer on the surface of the EQR-15 series silicon photomultiplier can directly emit light under the bombardment of alpha particles, the advantages of the integration of a photodiode and the high signal amplitude of a scintillator are integrated, and the detection sensitivity and the signal-to-noise ratio are remarkably improved while an independent scintillator is omitted. Aiming at weak current signals, a low-noise pre-amplification circuit with a TL084CDR operational amplifier as a core is designed, and a pulse shaping and emitter follower is arranged, so that the problems of signal amplification and interference resistance are effectively solved. The main control module realizes accurate capture and counting of alpha particle pulses through ADC sampling, hardware triggering and DMA storage in combination with a threshold self-adaption and baseline tracking algorithm.

The application discloses a method for accurately estimating fractional delay and Doppler in a Zak-OTFS system, and is an estimation method for the fractional delay and fractional Doppler situation existing due to insufficient delay and Doppler accuracy in an actual scene. The method comprises the following steps: considering the upsampling, pulse shaping and up-conversion and other steps in actual communication, through the signal after upsampling, the interpolation amplification is equivalent to being carried out on the delay axis, and the resolution is improved; the receiving end directly obtains the accurate estimation of the fractional delay and the fractional Doppler by using the signal after the matched filtering and not after the downsampling, and combining the periodicity of the Zak transformation. The application can not only estimate the fractional delay and Doppler, but also directly utilize the signal to obtain the channel information at the receiving end, and compared with the traditional estimation method, the additional algorithm complexity is reduced.