907 results about "Amplitude modulation" patented technology

The invention relates to the technical field of mechanical fault diagnosis, and discloses a gearbox fault diagnosis method and system based on lightweight variational Bayesian learning, and the method comprises the steps: collecting a to-be-diagnosed vibration signal of a gearbox, carrying out the preprocessing of the to-be-diagnosed vibration signal, and obtaining an original vibration signal and the fault feature frequency of the original vibration signal; determining amplitude modulation-frequency modulation sparse combination representation of the original vibration signal according to the fault characteristic frequency of the original vibration signal, and constructing a joint probability model according to classification distribution containing sparse vectors and the amplitude modulation-frequency modulation sparse combination representation of the original vibration signal; performing variational Bayesian inference solution on the joint probability model by using the non-overlapping sub-sequence of the original vibration signal and natural gradient optimization to obtain posterior probability estimation of a sparse coefficient; and determining an activation component according to the posterior probability estimation of the sparse coefficient and the sparse precision parameter, and matching the activation component with a pre-established multi-scale amplitude modulation-frequency modulation sparse dictionary to obtain a fault type and a confidence coefficient thereof.

The invention discloses an optical memristor, and relates to the field of photon integrated circuits and optical computing, and the optical memristor comprises a waveguide layer, a ferroelectric film layer, an electrode structure and a substrate. The ferroelectric film layer is located on the upper surface of the substrate; the waveguide layer and the electrode structure are located on the upper surface of the ferroelectric film layer; the waveguide layer is used for propagating an incident light signal and performing amplitude modulation on the incident light signal; the electrode structure is used for applying an electric field to the ferroelectric film layer; and the ferroelectric film layer is used for carrying out phase modulation on optical signals transmitted in the waveguide layer under the action of the electric field. The ferroelectric material is used as the optical switch of the optical memristor, efficient modulation of the optical phase is achieved through the non-volatility and the high electro-optical effect of the ferroelectric material, and meanwhile the optical memristor has the advantages of being low in energy consumption and rapid in response.

The invention discloses a multi-scattering SAR (Synthetic Aperture Radar) imaging simulation method, system and device based on physical consistency modeling and a medium. The method comprises the following steps: constructing a three-dimensional electromagnetic model of a target; constructing a geometric model under the working mode of the ray tracing auxiliary transmitting-receiving co-located SAR; a high-frequency electromagnetic scattering algorithm based on ray tracing is adopted, multiple scattering paths of a first order, a second order and a higher order are considered, superposition and amplitude modulation are carried out on scattering contributions of all orders, scattering field distribution of a target under the far field condition is calculated, and a far-field scattering field is obtained; performing spatial propagation mapping on the total far-field scattering field, and mapping a far-field scattering result into a radar platform near-field echo signal; correcting the amplitude of the echo signal to obtain a two-dimensional SAR near-field echo matrix; sAR imaging processing is carried out, wherein the SAR imaging processing comprises distance compression, range migration correction (RCMC) and azimuth compression. According to the invention, the authenticity and precision of SAR imaging simulation in a complex target scene are improved.

The invention relates to a display device. The display device comprises a light-emitting device and a pixel circuit. The pixel circuit comprises an amplitude modulation module, a pulse width modulation module and a switch module. A first capacitor in the pulse width modulation module is used for storing a first electric charge quantity corresponding to a pulse width data signal received by the pulse width modulation module. And a second capacitor in the amplitude modulation module is used for storing a second electric charge quantity corresponding to the amplitude data signal received by the driving unit. A connection node of the first capacitor and the driving unit is a first node, a connection node of the second capacitor and the pulse width control unit is a second node, and the switch module is connected between the first node and the second node and used for conducting the first node and the second node before a reset stage so as to neutralize charges stored in the first capacitor and the second capacitor. Therefore, the voltage of the first node is reduced, the influence on the reset signal is reduced, the problem that the light-emitting device emits light abnormally in the reset stage is solved, and the display effect of the display device is improved.

The present invention discloses an unified multiple access (MA) based system for uplink transmission of data by multiple users. The system comprises an user interface integrated transmitter modules for transmitting the data from multiple user transmitters over waveforms through a cooperative unified data grid structure including grid points, said unified data grid structure including each user transmitter allocation of a few non-overlapping grid points for loading respective data bearing symbols, with zeros loaded onto unallocated grid points. The user transmitter is configured to transmit a sparsely loaded grid resembling to the unified two-dimensional data grid structure involving data-bearing Quadrature Amplitude Modulation (QAM), where a part of available grid points of the grid as allocated is loaded with QAM symbols and remaining grid points are loaded with zero symbols. A waveform modulator corresponding to user transmitter is also provided in the present system for waveform modulation of said sparsely loaded grid as per the waveforms enabling transmission for multi-antenna reception of the waveforms to a base station or an access point.

The invention relates to the technical field of gear detection, in particular to a gear wear detection method and system of a gear motor. According to the method, firstly, all fault characteristic frequencies are obtained based on historical vibration signals of a fault gear, then vibration signals of a to-be-detected gear are divided into a plurality of local impact sub-segments, and the local frequency spectrum of each local impact sub-segment and the kurtosis of each frequency in the local frequency spectrum are obtained; fitting a fuzzy estimation signal of the vibration signal in combination with power distribution under each fault characteristic frequency in the time-frequency spectrum, and then modulating the vibration signal in combination with a motor load condition; and finally analyzing a frequency spectrum signal of the modulation vibration signal, and evaluating the early wear type of the gear to be detected. According to the method, the vibration signal is modulated by analyzing the covering interference of noise and motor load on local wear impact, and the frequency modulation effect and the amplitude modulation effect are further analyzed in the frequency domain of the modulated vibration signal, so that the early wear type is accurately distinguished, and the gear wear detection effect is improved.

Provided are a communication method and a communication device, the method comprising: determining a transmission waveform of a signal, the transmission waveform being related to a threshold of a first parameter, the first parameter comprising: a modulation order and a roll-off factor, the transmission waveform is an orthogonal frequency division multiplexing QAM-DFTS-OFDM waveform of discrete Fourier transform spread spectrum of orthogonal amplitude modulation or an orthogonal frequency division multiplexing OQAM-DFTS-OFDM waveform of discrete Fourier transform spread spectrum of offset orthogonal amplitude modulation, and the roll-off factor is determined based on the transmission bandwidth and the number of symbols carried by the transmission waveform. And transmitting or acquiring the signal. In the method provided by the invention, the network equipment or the terminal equipment can determine the transmission waveform of the signal according to the set threshold value of the modulation order and the threshold value of the roll-off factor, so that the output power supporting higher power amplifiers can be obtained, and a larger signal coverage range can be obtained.

The terahertz metasurface device comprises a top metal structure layer, a middle flexible polyimide dielectric layer and a bottom metal plate layer which are sequentially arranged from top to bottom, and the top metal structure layer, the middle flexible polyimide dielectric layer and the bottom metal plate layer form a Fabry-Perot resonant cavity. The amplitude and the phase can be regulated and controlled at the same time only by rotating the top layer metal structure of the sub-wavelength unit structure, the problems of large size, low precision and the like of an Airy beam generation device are effectively solved, and therefore flexible regulation and control of broadband (0.95-1.8 THz) one-dimensional and two-dimensional Airy beams in the terahertz wave band are achieved. And the possibility is developed for the application in high-capacity and obstacle-avoiding wireless communication.

The invention relates to a method and a system for realizing fast and uniform focusing of emergent light spots of a multi-mode optical fiber based on superpixels, belongs to the technical field of novel optical imaging and light field regulation and control, and integrates online speckle acquisition, offline amplitude optimization and an online speckle acquisition stage. When a certain modulation area is in an activated state, respectively capturing a non-interference speckle image of the emergent end of the multimode optical fiber and an interference speckle image generated when the area and the reference area are activated at the same time, and traversing all the modulation areas to totally obtain a speckle image; in the off-line amplitude optimization stage, a focusing light spot is preset, and calculation is carried out by utilizing intensity information of a corresponding focusing position in the speckle image. And analyzing all the focusing light spots one by one so as to construct a binary amplitude modulation mask. And the masks are loaded to the spatial light modulator one by one, so that accurate point-by-point focusing of N emergent light spots of the multimode optical fiber is realized, and the focusing efficiency and uniformity are greatly improved.

An aerosol provision device or a vapor provision device including an aerosol generator or vapor generator; a driving circuit connected to the aerosol generator or vapor generator, wherein the driving circuit is configured to employ either pulse width modulation or amplitude modulation, to supply power to the aerosol generator or vapor generator; and a power source connected to the driving circuit, wherein the power source includes a hybrid ion capacitor.

The invention provides an LED light source control method, device and equipment and a storage medium, and the method comprises the steps: collecting the temperature data of an LED light source module, carrying out the sliding window filtering processing, obtaining a temperature change curve, and calculating a temperature compensation control signal through combining a working current and a temperature-light intensity characteristic curve; dividing the detection period into a plurality of time slices, and performing frequency and amplitude modulation to obtain a composite pulse sequence; calculating surface shadow area distribution according to the three-dimensional contour data of the to-be-measured object, dividing the LED light source module into a main light source group and a supplementary light source group, and generating a time sequence interleaving control signal; controlling the two groups of light sources to alternately illuminate and collecting light intensity distribution data in the detection process; and performing deviation analysis on the light intensity distribution data to generate a compensation signal, and feeding back and updating a temperature compensation control signal. According to the scheme, through prediction compensation and an alternating illumination mechanism, the temperature drift influence of the LED light source is reduced, the response delay of feedback control is reduced, the stability of light intensity is improved, and the accuracy of a detection result is ensured.

The invention discloses a three-degree-of-freedom ultrasonic motor driving control method. A three-degree-of-freedom ultrasonic motor comprises a signal generation module, a key control module, a power amplification module, a communication module, a grating ruler analysis module, a control algorithm, a data processing module, a power amplification circuit, a matching circuit and a voltage and current sampling circuit. The signal generation module outputs six paths of PWM waves with adjustable frequencies, phases and duty ratios, the control algorithm module performs adjustment through a control algorithm according to operation parameters of an ultrasonic motor fed back by a grating ruler, the key module is used for manual control, and the communication module is composed of USART logic and DMA logic. A control algorithm and data processing are generated by a single-chip microcomputer, detection and servo control are carried out through a communication USART module, and real-time monitoring, power amplification and matching are carried out on a serial port assistant of an upper computer, and a voltage and current sampling circuit drives and stabilizes operation of the ultrasonic motor. According to the invention, the amplitude modulation precision is below 4mv, and the stability is higher through a closed-loop control algorithm.

The invention discloses a diamond low-frequency current measurement method with nonlinear response to magnetic field intensity, which is characterized in that two coils are wound on a magnetic flux collector with a communicated structure, a high-frequency (800Hz) high-voltage (7V) driving current is injected into one of the coils, a magnetic field generated by the coil is amplified through the magnetic flux collector and guided to an area where an NV color center magnetometer is located, and the NV color center magnetometer is located; and the signal is driven to enter a nonlinear response interval in the demodulated ODMR spectrum. A weak (1-50mV) to-be-measured low-frequency (0.1-10Hz) current signal is injected into the other coil, amplitude modulation is performed on the weak (1-50mV) to-be-measured low-frequency (0.1-10Hz) current signal by using the same frequency as the driving current, and the weak (1-50mV) to-be-measured low-frequency (0.1-10Hz) current signal is amplified by the magnetic flux collector and guided to the NV The microwave frequency is locked at the maximum slope point of the ODMR frequency spectrum through CW-ODMR phase-locked amplification, so that the relationship between the change of the red fluorescence signal intensity and the size of the external magnetic field is obtained, and the signal intensity of the low-frequency current magnetic field to be measured is measured according to the relationship.

The invention discloses an intermediate frequency electro-therapeutic apparatus, which comprises a controller and a waveform synthesis circuit, and is characterized in that the waveform synthesis circuit comprises a first amplitude adjusting circuit, a second amplitude adjusting circuit and a synthesis adjusting circuit, and the controller generates a first PWM signal according to the overall amplitude information; the first amplitude adjusting circuit performs amplitude modulation processing on an input original waveform according to the first PWM signal to generate a first analog waveform signal; the controller obtains amplitude information corresponding to the frequency of the modulation waveform by using the phase accumulator, and generates a second PWM signal; a second amplitude adjusting circuit performs multiplication operation on the second PWM signal and the first analog waveform signal to obtain a second analog waveform signal and obtain an inverted waveform signal; the controller obtains amplitude information corresponding to the frequency of the fundamental frequency waveform by using a phase accumulator, and generates a third PWM signal; and the synthesis adjusting circuit performs multiplication operation on the third PWM signal and the second analog waveform signal or the inverted waveform signal to generate an intermediate frequency treatment waveform.

The invention discloses an ODAC implementation system and method based on a five-segment thermo-optical phase modulator, and relates to the technical field of optical communication, and the method comprises the following steps: obtaining single-mode laser input, dividing the single-mode laser input into two paths through a multi-mode interference device beam splitter, and transmitting the single-mode laser input into an upper arm and a lower arm of a Mach-Zehnder modulator; the current is adjusted through the thermo-optic phase modulator to control the temperature, the refractive index is changed to introduce phase delay, and the phase difference of two arms of the Mach-Zehnder modulator is calibrated; on the basis of a five-segment thermo-optical modulator, hierarchical amplitude modulation is carried out on beam splitting light according to digital input, a phase space is constructed by utilizing weight combination, and a linear optimal discrete state is screened; the modulated light is combined by a multi-mode interference device beam combiner, and digital-analog mapping output of light intensity is carried out; a detector installed at an output port of the five-segment thermo-optical phase modulator is used for monitoring output optical power in real time, the output optical power is fed back to a control circuit to calculate errors, thermo-optical modulation current is dynamically adjusted to compensate offset point drift, and optical digital analog conversion is achieved.

The invention discloses a surface treatment method and system for a forming engineering material, and relates to the technical field of material surface treatment.The surface treatment method comprises the steps that material surface characteristics and surface quality standards of the forming engineering material are read; measuring the characteristic amplitude modulation of the material surface characteristics and the surface quality standard, and identifying the characteristic correlation; on the basis of feature amplitude modulation and feature correlation, in combination with an adaptive decision model, performing intra-layer independent analysis and inter-layer collaborative analysis, and optimizing a decision to determine a surface treatment scheme; configuring the intelligent central control system; with the exception handling features as indexes, industrial big data retrieval is performed, a regulation and control plan library is constructed, and an autonomous calibration rule based on control deviation is set; configuring the digital feedback device; and performing closed loop control on the surface treatment of the forming engineering material. The technical problem that in the prior art, real-time and accurate control over the material surface quality is difficult is solved, and the technical effect of improving the surface treatment efficiency and quality is achieved.

The invention discloses a low-sidelobe antenna based on double-metasurface amplitude and phase independent regulation and control. The antenna structure comprises a metasurface 1 and a metasurface 2. The metasurface 1 and the metasurface 2 comprise a plurality of metasurface units; the metasurface 1 is a phase modulation plane, comprises a phase regulation and control unit and is decoupled with the amplitude control function of the amplitude filtering plane; the metasurface 2 is an amplitude filtering plane and comprises an amplitude regulation and control unit, and the modulation process is decoupled from phase regulation and control of the metasurface 1; the phase regulation and control unit and the amplitude regulation and control unit comprise three metal layers and two dielectric layers; the first layer, the third layer and the fifth layer from bottom to top are metal layers, and the second layer and the fourth layer are dielectric layers. Through the design of the double-layer metasurface structure, completely independent operation of the phase regulation and control layer and the amplitude modulation layer is achieved, the technical contradiction that amplitude and phase parameters in a traditional single-layer metasurface are mutually restrained is avoided, and the core technical problem that the side lobe level of a transmission antenna is too high is solved cooperatively.

A bi-directional optical communication system employing a minimum number of single-mode high repetition rate pulsed optical signal sources to achieve cost efficiency while maintaining high data rates. The bi-directional optical communication system includes a first optical data processing unit and a second optical data processing unit. The first optical data processing unit modulates a pulsed optical source using a differential quadrature phase shift keying (DQPSK) modulation and two-level pulse amplitude (PAM-2) modulation and then demodulates it to achieve a pulse amplitude modulated signal. The second optical data processing unit reuses the same optical carrier by passing it through a regenerative wavelength converter to generate three pulsed optical carriers at different wavelengths and employs an On-off keying (OOK) modulation scheme. These carriers are employed to send uplink data at a same rate of as the downlink. As a result, large data is transmitted from one data center to another data center through a downlink and uplink free space optical link network.

A quadrature amplitude modulation (QAM) transmitter separates an input digital level into I and Q components. In a variation, a QAM transmitter uses every other input digital level as an I or Q component. A QAM receiver receives a QAM modulated signal and outputs digital levels. A QAM transmitter for transmitting analog levels uses a pair of input analog levels as the I and Q components. A QAM receiver receives a QAM modulated signal and outputs analog levels. The digital and analog input levels are produced by encoding N samples using L orthogonal codes.

Systems and devices are provided for receiving or transmitting IQ data (e.g., suitable for passband quadrature amplitude modulation (QAM)) over a wireline using pairs of baseband pulse amplitude modulation (PAM-n) signals. Encoding circuitry may map data from an input bit stream to IQ data that includes an in-phase component and a quadrature-phase component. Modulator circuitry may determine an in-phase PAM-n signal based on the in-phase component and a quadrature-phase PAM-n signal based on the quadrature-phase component. Driver circuitry may transmit the in-phase PAM-n signal and the quadrature-phase PAM-n signal across a wireline channel. The in-phase PAM-n signal may be different by 90° from the quadrature-phase PAM-n signal. This may enable a remote receiver on the wireline channel to detect the in-phase PAM-n signal independently of the quadrature-phase PAM-n signal.

An optical frequency generation system (100), comprising: - reference atoms (7) in a gas phase, - an interrogation laser source (1) configured to emit an interrogation signal (101) comprising a first optical frequency suitable for exciting a two-photon transition in said reference atoms (7), said interrogation signal (101) being configured to interact with said reference atoms (7) in a Doppler-free scheme; - optical frequency modulation means (31, 31a, 31b) configured to adjust said first optical frequency and to modulate said first optical frequency at a first modulation frequency f1; - an optical sensor (9) configured to detect a fluorescence signal (110) from said reference atoms (7); - a first control loop (10) configured to lock said first optical frequency to a resonance frequency of said two-photon transition, said fluorescence signal (110) being input into the first control loop (10); - a mitigation laser source (2) configured to emit a mitigation signal (102) comprising a second optical frequency selected to produce a light-shift of said two-photon transition of opposite sign of the light-shift produced by the interrogation signal (101); characterized in that the optical frequency generation system (100) further comprises: - optical amplitude modulation means (5) configured to modulate the amplitude of the interrogation signal (101) and of the mitigation signal (102) at a second modulation frequency f2, and - a second control loop (20) configured to adjust the relative amplitude of the mitigation signal (102) with respect to the interrogation signal (101) such as to cancel the effective light-shift of the combined interrogation (101) and mitigation (102) signals.

The invention relates to the technical field of ultrahigh-order QAM (Quadrature Amplitude Modulation) signal nonlinear compensation, in particular to an ultrahigh-order QAM signal nonlinear compensation method and system based on a time characteristic memory neural network, and the method comprises the steps: S1, obtaining a plurality of groups of orthogonal amplitude modulation signals under the condition of different optical signal-to-noise ratios, performing zero mean normalization processing on the quadrature amplitude modulation signal to obtain a pre-processed quadrature amplitude modulation signal; s2, dividing the preprocessed orthogonal amplitude modulation signal into a training set and a test set, constructing a signal nonlinear compensation model, and training the signal nonlinear compensation model by using the training set to obtain a trained signal nonlinear compensation model; and S3, based on the trained signal nonlinear compensation model, performing nonlinear compensation on a quadrature amplitude modulation signal to be compensated. According to the method, the time sequence characteristics of the signals can be extracted, the two-way time dependence relation can be captured, and the purpose of nonlinear distortion compensation is achieved.

Metamaterial optics are integrated with vacuum-boundary walls of ultra-high-vacuum (UHV) cells to manipulate light in a manner analogous to various bulk optical elements including lenses, mirrors, beam splitters, polarizers, waveplate, wave guides, frequency modulators, and amplitude modulators. For example, UHV cells can have metasurface lenses formed on interior and / or exterior surfaces on one or more of their vacuum-boundary walls. Each metasurface lens can include a plurality of mesas with the same height and various cross-sectional dimensions. The uses of metasurface lenses allows through-going laser beams to be expanded, collimated or focused without using bulky refractive optics. Each metasurface lens can be formed on a cell wall using photolithographic or other techniques.

Systems and methods that include: providing input information in an electronic format; converting at least a part of the electronic input information into an optical input vector; optically transforming the optical input vector into an optical output vector based on an optical matrix multiplication; converting the optical output vector into an electronic format; and electronically applying a non-linear transformation to the electronically converted optical output vector to provide output information in an electronic format.In some examples, a set of multiple input values are encoded on respective optical signals carried by optical waveguides. For each of at least two subsets of one or more optical signals, a corresponding set of one or more copying modules splits the subset of one or more optical signals into two or more copies of the optical signals. For each of at least two copies of a first subset of one or more optical signals, a corresponding multiplication module multiplies the one or more optical signals of the first subset by one or more matrix element values using optical amplitude modulation. For results of two or more of the multiplication modules, a summation module produces an electrical signal that represents a sum of the results of the two or more of the multiplication modules.

The invention discloses a sine frequency modulation harmonic error compensation method based on Bessel function modulation characteristics, and relates to the technical field of sine frequency modulation nonlinear parameter compensation and high-precision measurement of target absolute distance based on multi-wavelength interference. The problem that the constant phase demodulation precision is insufficient due to the fact that carrier harmonic waves, accompanying amplitude modulation and modulation depth errors cannot be effectively suppressed due to laser modulation nonlinearity in existing sine frequency modulation distance measurement is solved. According to the method, after sine frequency modulation interference signals are collected, high-pass filtering is carried out to remove low-frequency components, Hilbert transform is carried out to remove envelope suppression associated amplitude modulation, window function frequency mixing is carried out to extract modulation depth, a matched carrier containing second harmonics is constructed, and frequency modulation harmonic parameter optimization is achieved through baseband amplitude maximization. And finally, carrying out orthogonal demodulation on the compensated interference signal to obtain a high-precision constant phase. The method is suitable for high-precision multi-wavelength interference ranging, precision displacement measurement and optical metering systems.

An enhanced link adaptation (eELA) method includes receiving, by a responding device from a requesting device, a physical layer protocol data unit (PPDU) including an eELA request message, determining, by the responding device, an eELA feedback message comprising unequal quadrature amplitude modulation (UEQM) information across a plurality of spatial streams based on at least the number of spatial streams derived from the eELA request message or the PPDU, and transmitting, from the responding device to the requesting device, the eELA feedback message. The UEQM information indicates an effective Signal-to-Noise Ratio (SNR) per spatial stream or a derivative of the effective SNR per spatial stream.

The invention belongs to the technical field of computer vision and computer graphics, and discloses a multi-view three-dimensional reconstruction method and device based on cross-domain feature fusion and a medium, and the method comprises the steps: carrying out the cross-feature-domain coding of an initial feature token generated by a multi-view image, according to the coding, characteristics are decomposed into low-frequency components and high-frequency components through dual-tree complex wavelet transform, amplitude modulation is carried out on the high-frequency components to enhance details, and space-frequency fusion characteristics are generated; variance embedding weighted combination is carried out on the multi-view space-frequency fusion features, the combination generates a weight by calculating the variance of each feature token, adaptive weighted clustering is carried out based on the weight, and fused multi-view features are generated; and performing three-source attention decoding on the fused features, and performing cross-domain attention calculation and up-sampling by taking static embedding as query, taking the space-frequency fused features as keys and taking the fused multi-view features as values, thereby finally generating a three-dimensional voxel reconstruction result of the target object.

The invention relates to a method and a device for calibrating the demodulation of data modulated by amplitude modulation of a light signal emitted by a light source. The device comprises a device (20) for capturing a digital image having related sensitivity and exposure time parameters, and an electronic computing device (23) implementing modules of:-automatically adjusting (24) the sensitivity and exposure time parameters,-acquiring (26) the digital image by the digital image capturing device,-extracting (28) a series of samples from the acquired digital image,-determining (28) the series of samples,-determining (28) the series of samples, and-determining (28) the series of samples. Each extracted sample takes one of two predetermined values,-calculating (30) a plurality of sampling factors from the series of samples, each sampling factor relating to a predetermined pattern and indicating a sample number representing the same value of the pattern, and storing the calculated sampling factors.

The invention belongs to the technical field of power equipment fault diagnosis, and particularly discloses a knowledge distillation-based 1D-CNN online partial discharge identification method, which comprises the following steps of performing Fourier transform on an original signal and then implementing four data enhancements of amplitude modulation, phase modulation, frequency band enhancement and frequency domain noise injection; constructing a multi-branch one-dimensional convolutional neural network to extract time-frequency features, and training a teacher model in combination with residual connection and an SE attention mechanism; compressing the teacher model into a lightweight student model by adopting a knowledge distillation strategy of a preset temperature parameter and a weight coefficient; the student model is converted into a mobile terminal compatible format, and a mobile phone APP is established through a QT upper computer; and online real-time identification is realized. According to the method, the problem of sample imbalance is effectively relieved, in addition, the knowledge distillation realizes model volume compression and reasoning speed increase while keeping relatively high accuracy, the calculated amount is small, the real-time performance is high, and the precision is high.

The invention discloses a hollow-core optical fiber communication method and system for reducing complexity, and the method comprises the steps: obtaining original bit data, and mapping the original bit data to an initial constellation diagram through a quadrature amplitude modulation mapping algorithm; rotating the initial constellation diagram according to a preset rotation angle to obtain a first constellation optimization diagram, adjusting the first constellation optimization diagram by using a sparrow search algorithm to obtain a second constellation optimization diagram, converting the second constellation optimization diagram into a transmission signal, and transmitting the transmission signal to the receiving end through a hollow-core optical fiber; performing data preprocessing on the received transmission signal to obtain a de-noised signal, performing phase recovery on the de-noised signal based on a quadratic algorithm to obtain a second constellation optimization graph, and performing de-mapping on the second constellation optimization graph to re-convert the second constellation optimization graph into original bit data; according to the invention, the complexity of digital signal processing is reduced, and the accuracy and efficiency of phase recovery are obviously improved, so that the performance of a coherent optical communication system based on the hollow-core optical fiber is comprehensively improved.