85 results about "Carrier modulation" patented technology

The invention relates to the field of cloud edge cooperative scheduling, and discloses a communication network resource management system and method based on intelligent scheduling, and the method comprises the steps: carrying out the phase separation domain splitting processing of a real-time communication trace, scattering the carrier wave off-modulation texture, the edge channel congestion emergence sequence and the micro-burst session cluster to a plurality of dynamic interaction cavities; under the guidance of the time-varying disturbance skeleton diagram, performing reverse stitching and rhythm bias turn-back on the cloud edge response loop, and writing the cloud edge response loop into an instantaneous cache loop of an edge node; identifying a cloud edge response loop and constructing a self-adjusting sequence factor through signal folding disorder in an error frequency recursion layer; based on a time sequence reconstruction pattern in a transition state regulation and control domain, mapping each edge node into a potential distribution factor matrix; and when the intelligent scheduling chain track enters the stable plastic transition window, performing lamination fusion calculation processing on the transition state regulation and control domain. The method has the advantage of improving the utilization rate of network resources.

The invention provides a seismic data bidirectional frequency band expansion method based on carrier modulation, which relates to the field of seismic exploration, and comprises the following steps: processing original seismic data through time window segmentation, calculating an autocorrelation function and carrying out time domain continuation; solving a prediction coefficient based on entropy maximization constraint to generate an amplitude spectrum; calculating a boundary attenuation rate through boundary frequency point positioning; constructing an attenuation compensation function to generate a frequency domain carrier function; applying sparse constraint to solve a weighting factor and iteratively calculating a modulation amplitude spectrum; and finally, carrying out combined inverse transformation with an original phase spectrum to obtain expanded data. According to the method, the resolution and the signal-to-noise ratio of the seismic data are effectively improved, and the seismic interpretation precision is improved.

The invention belongs to the technical field of power electronics, and provides a multi-degree-of-freedom general carrier modulation method and system for a current source converter, and the method comprises the steps: constructing a modular cascade current source converter; a sine pulse width sequence is output through carrier modulation to analyze direct-current side voltage harmonic distribution in the constructed modular cascade current source type converter; determining the optimal phase shift angle of the modular cascade current source type converter by taking the sine pulse width sequence waveform quality, the switching frequency and the DC voltage performance optimization as optimization targets according to the distribution result of the DC side voltage harmonic waves; and adjusting the three-phase carrier wave of each current source module in the current source type converter based on the determined optimal phase shift angle, and completing multi-degree-of-freedom general carrier wave modulation of the current source type converter.

The invention discloses a direct-current ship power grid fault flexible ride-through method based on zero-sequence current injection, which belongs to the technical field of direct-current ship power grid fault protection, and comprises the following steps: when a switch fault is detected, positioning the position of a fault switch; calculating the degree of asymmetry of the direct-current voltage according to the output voltage requirement of the inverter; the direct-current voltage asymmetry degree serves as input, the rectifier is controlled through carrier amplitude modulation and zero-sequence component injection, and asymmetric direct-current voltage is output; the method comprises the following steps of: determining locking and conducting switches when different switch faults occur, and controlling an inverter to realize generation of separated alternating-current phase voltage and optimal zero-sequence component injection through two-level carrier modulation according to asymmetric direct-current voltage so as to complete flexible fault ride-through of the frequency converter. By adopting the method, the processes of capacitor discharge, energy feedback and the like in the fault period are adjusted through the control factors, system instability and equipment reverse rotation are prevented, and continuous power supply and operation safety of a ship power grid are guaranteed.

The present application provides a high-power semiconductor light-emitting chip with longitudinal carrier modulation and a manufacturing method therefor. The high-power semiconductor light-emitting chip with longitudinal carrier modulation includes: an active layer; a first semiconductor cell layer disposed on the active layer, wherein the first semiconductor cell layer includes a contact doped layer, the first semiconductor cell layer includes a plurality of current blocking regions that are disposed at least in the contact doped layer and distributed in a slow-axis direction, and the parts of the first semiconductor cell layer between neighboring current blocking regions act as current injection regions, wherein a current density function J(z) of current density in the active layer satisfies:J⁡(z)=(Jop-J0)·f⁡(z)+J0;f⁡(z)=Np(z)1L·∫L0Np(z)⁢dz;whereinJ0=α⁢N0+bN02+cN03,N0=Ntr⁢exp⁡(αi+amΓ⁢g0);and an average resistivity r(z) of corresponding current injection regions and current blocking regions at any position in the cavity-length direction satisfiesr⁡(z)=r0·1f⁡(z)+J0 / (Jop-J0),where r0 is a coefficient of r(z).

The application discloses a B3I signal simulation method and device, terminal equipment and storage medium, through obtaining ephemeris data, generating pseudo code and extension code, and modulating the same, a real B3I signal can be quickly and accurately generated. In this way, the original signal simulation can be freed from the dependence on hardware equipment, and only ephemeris data provided by a user and satellite messages of a Beidou satellite are needed to generate a corresponding B3I signal. In addition, a Doppler frequency shift is calculated according to the distance between a satellite and the user, and is applied to carrier modulation, so that the B3I signals of various satellites can be more accurately simulated. By comprehensively considering ephemeris data, distance calculation, pseudo code generation, Doppler frequency shift and navigation messages and the like, a real B3I signal with a Doppler effect can be generated, which provides a beneficial tool and data for testing and verification of a B3I signal receiver, so that the research and development efficiency of a navigation satellite signal receiver is improved.

A wireless transmit / receive unit, WTRU, can select a constellation from a set of constellations corresponding to a symbol configuration for indirect carrier modulation, ICM, based on at least one constellation performance efficacy indicator, each constellation performance efficacy indicator respectively corresponding to a constellation of the set of constellations, and use the selected constellation and symbol configuration to simultaneously harvest energy and transmit data.

The invention belongs to the technical field of power distribution network communication processing, and particularly relates to a multi-device converged communication processing method for power distribution network automation. Equipment sub-signals adopt single modulation and are distributed with different frequency bands, and a multi-channel transmission scheme is established by adopting a frequency division multiplexing carrier modulation method based on a power distribution network communication system; signal modulation processing based on a power distribution network transmission environment; and respectively performing transmission optimization on the data by using the sending end and the receiving end. On the basis of the existing transmission network, the information transmission efficiency and capability, especially the capability of multi-device joint communication processing, are further enhanced.

The invention discloses an interference equalization method, device and equipment for multi-carrier modulation in a high-dynamic scene and a storage medium, and relates to the technical field of mobile communication, and the method comprises the steps: obtaining a time domain channel matrix of a time-frequency double-color dispersion channel, and determining an inversion core matrix in a minimum mean square error equalization matrix based on the time domain channel matrix; based on the sparsity structure of the inversion core matrix, decomposing the inversion core matrix to obtain a decomposition matrix; based on the time domain channel matrix, the inversion core matrix and the decomposition matrix, determining a multilayer linear equation set with minimum mean square error equalization; and solving the multi-layer linear equation set to obtain an equalization result. By means of the mode, the calculation complexity of the equalization process in the process of resisting inter-symbol interference and inter-carrier interference existing in multi-carrier modulation in a high dynamic scene is remarkably reduced, excellent performance is still kept under the extreme condition that no cyclic prefix exists or the length of the cyclic prefix is zero, and high scene adaptability and system practicability are embodied.

The application discloses a control method and system of a wideband impedance measuring device, which injects disturbance current into a grid-connected system in parallel and obtains system impedance characteristics in response to voltage. The application collects grid point voltage and output current of the wideband impedance measuring device, obtains a fundamental component of a current reference value in a rotating coordinate system by adopting voltage outer loop control, obtains a disturbance component of the current reference value in the rotating coordinate system by adopting current outer loop control, and obtains three-phase control voltage of the wideband impedance measuring device by adopting current inner loop control, voltage feedforward control and carrier modulation, so that the wideband impedance measuring device control is effectively realized.

The invention relates to the technical field of power electronic converter control, in particular to a flexible power control method and system for a multi-port direct-current and alternating-current converter. The method comprises the following steps: acquiring voltage and current data of a three-phase power grid; alpha-beta conversion is carried out according to the acquired three-phase power grid voltage and current data, and a power grid voltage orthogonal component and power relation is generated; generating double modulation waves according to the power grid voltage; calculating a battery current reference according to a power grid voltage orthogonal component and a power relation; the zero-sequence injection amount is inversely calculated according to the double modulation waves and the battery current reference; carrying out carrier modulation by using the zero-sequence injection quantity; and performing inverter driving based on the carrier modulation signal. According to the invention, continuous control of the power of the battery port can be realized without depending on duty ratio adjustment of a traditional small vector pair, and a control dead zone under a high modulation degree / low power factor is avoided.

Disclosed are a method and apparatus for synchronous switching of multiple-input demodulation comparators. The method includes receiving line signals by a plurality of combined multiple-input comparator demodulation circuits, each combined multiple-input comparator demodulation circuit receiving the line signals according to a corresponding input arrangement related to a corresponding subchannel vector of a plurality of mutually orthogonal subchannel vectors, the line signals including a superposition of a set of baseband symbols and a set of carrier-modulated symbols; generating a set of baseband subchannel outputs by combining the set of line signals according to the corresponding input arrangement; obtaining a phase-adjusted demodulation signal related to the set of carrier-modulated symbols; and generating a set of demodulated subchannel outputs by combining the set of line signals according to the corresponding input arrangement and according to the phase-adjusted demodulation signal, the phase-adjusted demodulation signal configured to constructively combine a first half cycle and a second half cycle of the carrier-modulated signals and destructively cancel the set of baseband symbols.

The application provides a multi-target user detection synchronization method, system and storage medium based on a sweep frequency spread spectrum carrier modulation technology. A transmitting end preferably constructs a Gold sequence as a spread spectrum code by using an m sequence, modulates the Gold sequence on a periodic linear sweep frequency carrier in a BPSK mode by using an S2C modulation mode, and forms a synchronization header signal with a sharp autocorrelation peak and a low cross-correlation side lobe. A receiving end preliminarily positions the synchronization header by correlation detection, and then performs a de-skew processing on the received signal, multiplies the received signal with a local linear frequency modulation reference signal, and performs a band pass filtering, so as to convert the wideband sweep frequency signal into a single frequency signal, and greatly reduce the processing complexity. On this basis, the coarse synchronization utilizes the correlation detection combined with the maximum likelihood method to preliminarily time in the time domain, and the fine synchronization finely adjusts according to the frequency characteristics of the de-skewed signal. The method can still realize the robust multi-target signal detection and high-precision positioning in a complex underwater acoustic multipath environment, and has good engineering practicability.

This invention relates to the field of smart meter communication data acquisition technology, and discloses a method for anti-interference data acquisition in smart meter communication based on multi-carrier modulation technology. The method includes using multi-carrier modulation to perform frequency division processing on the signal during data transmission, combining channel state perception and dynamic subcarrier allocation strategies to avoid interference frequency bands in real time, and enhancing data robustness through time-frequency joint coding. This application can effectively suppress narrowband interference and impulse noise, improving the communication reliability and data acquisition accuracy of smart meters in complex electromagnetic environments.

This invention proposes a ripple-optimal clamping modulation method for two parallel converters. Based on the equivalent voltage vector plane of the two parallel converters, the method divides the vector plane into multiple equilateral triangular regions according to the principle of near-three-vector synthesis. Within each equilateral triangular region, by controlling the total number of conducting switches in each of the three-phase parallel branches to vary in an increasing or decreasing manner, a set of optimal ripple vector sequences is constructed. A switching sequence is generated based on this vector sequence, and the final optimal switching sequence is determined with the goal of minimizing the peak value of single-phase circulating current. Furthermore, a carrier modulation scheme based on a combination of increasing and decreasing sawtooth carriers is constructed. According to the symmetry of the switching sequence, the configuration of the carrier and modulation wave is selected. Simultaneously, the carrier polarity is alternately configured within adjacent carrier periods to achieve symmetry of adjacent carrier periods of the switching signal. This method can effectively reduce output current ripple and suppress parallel branch circulating current, while simultaneously reducing switching losses and improving system performance.

Receiver devices for single-carrier modulation are disclosed. In particular, the receiver devices of the present disclosure are able to deal with doubly selective channels (i.e., channels varying in time and frequency). The receiver devices are configured to determine channel state information (CSI) of a communication channel and a plurality of signature roots based on the CSI. Each signature root of the plurality of signature roots is a nonzero complex point, wherein the plurality of signature roots are uniformly distributed on a circumference of a circle in a complex plane. The receiver devices are further configured to construct a first Vandermonde matrix based on the plurality of signature roots, perform a demodulation of a single-carrier modulated signal, based on the first Vandermonde matrix, to obtain a demodulated signal, and obtain symbols based on performing an iterative procedure on the demodulated signal.

Provided in an embodiment of the present invention are a modulation signal generation method and device, a storage medium, an electronic device and a computer program product, the method comprising: according to a frequency domain resource occupied by a user, determining a value of a first subcarrier for bearing various preamble symbols of an initial modulation signal to be generated, determining a first index of a first effective subcarrier of the first subcarrier; generating a second index of a second subcarrier for bearing a signal field symbol of an initial modulation signal to be generated and data according to a predetermined interleaving mode and a dual carrier modulation (DCM) rule; selecting various symbols and data of a to-be-generated initial modulation signal according to a predetermined selection receiving mode, and correspondingly bearing the various symbols and data of the to-be-generated initial modulation signal on the first effective subcarrier and the second effective subcarrier based on the first index and the second index to obtain the initial modulation signal; and sequentially performing frequency domain processing and time domain processing on the initial modulation signal to obtain a target modulation signal.

The invention relates to a communication and navigation integrated signal processing method for a low-orbit satellite. The method comprises the following steps: step 1, establishing a system model and designing an ICAN waveform; step 2, transmitter ICAN resource mapping and communication-navigation joint modulation; step 3, receiver communication-navigation joint demodulation; step 4, calculating communication capacity and navigation positioning precision; 5, constructing a communication-navigation combined utility index and solving a waveform parameter; the method has the advantages that various multi-carrier modulation and pseudo-random codes can be well compatible, and time-frequency resources and hardware overhead are saved by providing a framework and a normal form of a communication and navigation integrated waveform; the communication-navigation combined utility index provided by the invention can directly reflect the integrated performance compared with the independent use of a single function index, and is more intuitive and efficient compared with separate measurement; by maximizing the proposed integrated utility index, the optimal waveform parameter can be obtained, and better communication and navigation performance can be obtained under limited time-frequency resources.

The invention discloses a power distribution method and device for an asymmetric inverter system, equipment and a medium, and the method comprises the steps: obtaining a total voltage modulation wave and a weight factor of the asymmetric inverter system, and carrying out the modulation according to a preset carrier modulation mode; the triangular carrier is converted into an upper carrier and a lower carrier which are used by a three-level inverter, the triangular carrier is converted into an intermediate carrier which is used by a two-level inverter, and in a modulation wave period, when the weight factor is larger than the instantaneous amplitude of the weight triangular wave, according to the amplitude of the intermediate carrier, the triangular carrier is converted into the upper carrier and the lower carrier which are used by the three-level inverter. Clamping the voltage of the two-level inverter to a first maximum voltage modulation wave, and calculating a compensation voltage modulation wave of the three-level inverter according to the total voltage modulation wave; and when the weight factor is smaller than the weight load wave instantaneous amplitude, clamping the voltage of the three-level inverter to a second maximum voltage modulation wave, and calculating a compensation voltage modulation wave of the two-level inverter according to the total voltage modulation wave. Dynamic management of flexible power distribution can be realized.

The application discloses an earthquake early warning device and method based on campus broadcasting, which receives an early warning signal of an earthquake monitoring center, carries out building response coupling analysis to generate a magnitude-building coupling characteristic, and maps the magnitude-building coupling characteristic into an enhanced early warning source adapted to an acoustic environment; based on threatened area identification, an acoustic cavity is detected to construct a differentiated playing topology; a high-risk gathering area is extracted through personnel density scanning to generate personalized evacuation guide content and determine a playing priority; a synchronous reference anchor point technology is adopted to realize high-precision timing control, a multi-modal playing domain is constructed through carrier modulation and frequency division multiplexing; finally, an acoustic navigation field is used to guide accurate scheduling and playing of audio signals, and the application can realize differentiated playing and accurate coverage of early warning information according to the anti-seismic characteristics of different buildings and the acoustic environment characteristics, and provides an intelligent acoustic solution for campus earthquake early warning.

The application provides a hybrid multi-level inverter fault-tolerant control method and system, which utilizes amplitude-shifted carrier modulation to modulate N-1 carriers in the same phase and stacked, so that the T-type inverter part and the H-bridge unit share one carrier for modulation, and N is the number of voltage levels; when an open-circuit fault occurs in a switch tube of an H-bridge unit of a phase, the fault-tolerant control of the modified three-phase modulation wave reference voltage is carried out, and the redundant state of the switch is utilized to make the current bypass the faulty switch tube, so that the hybrid topology N-level inverter in normal operation is converted into an N-1-level inverter in fault operation. In the application, the method of limiting the modification degree is adopted in the fault, the change of the modulation wave is affected, the charging and discharging time of the flying capacitor voltage is changed, and then the flying capacitor voltage is balanced, so that the fluctuation is stable within the range without causing three-phase current distortion.

This invention discloses a digital isolator circuit with additional delay, including a transmitter circuit that receives a data input signal and generates first and second transmitter output signals, wherein the second transmitter output signal is a delayed version of the first transmitter output signal. Subsequently, an isolation barrier generates the first and second isolation output signals, causing a receiver circuit to generate a data output signal in response to these isolation output signals. By further incorporating a delay circuit in the transmitter circuit to delay the first transmitter output signal and generate the second transmitter output signal, this invention effectively enhances the received signal at the receiver circuit, maintaining the stability of the common-mode signal and the robustness of data transmission. A pulse carrier modulation mechanism is also employed to effectively reduce power consumption, electromagnetic interference, and signal jitter.

The application discloses a lamp wall control circuit, which comprises a wall control switch K1, a wall control module and a carrier wave modulation module arranged on a wall control panel, a main control chip U1, a load power supply and a driving module arranged on a main control panel, and a commercial power L which is electrically connected with the carrier wave modulation module through the wall control switch K1. The wall control module outputs a carrier wave signal to the carrier wave modulation module, and the carrier wave modulation module is used for modulating the carrier wave signal into a control signal. The commercial power L line supplies power to the load power supply through the carrier wave modulation module, and the control signal is transmitted to the main control chip U1 through the load power supply which is carried on the commercial power L line. The main control chip U1 controls the driving module to work to drive the load according to the control signal.

The application belongs to the technical field of power electronics, and provides a multi-degree-of-freedom universal carrier modulation method and system of a current source converter, comprising: constructing a modular cascaded current source converter; using carrier modulation to output a sine pulse width sequence to analyze the DC side voltage harmonic distribution in the constructed modular cascaded current source converter; according to the distribution result of the DC side voltage harmonic, taking the sine pulse width sequence waveform quality, the switching frequency and the DC voltage performance as the optimization target, determining the optimal phase shift angle of the modular cascaded current source converter; based on the determined optimal phase shift angle, adjusting the three-phase carrier of each current source module in the current source converter, and completing the multi-degree-of-freedom universal carrier modulation of the current source converter.

The invention provides an optical transmitter, which belongs to the field of communication and comprises a laser, an IQ modulator, a coupler and an automatic bias control module. Wherein the laser is used for generating an optical carrier, and the IQ modulator is connected with the laser and used for modulating the optical carrier and outputting a modulated optical signal; the automatic bias control module is connected with the IQ modulator through the coupler, and the automatic bias control module, the coupler and the IQ modulator jointly form a closed-loop feedback control loop used for stabilizing a bias point of the IQ modulator. According to the invention, the core requirements of both flexibility and stability in the control of the bias point of the IQ modulator of the transmitter in a coherent optical communication system are met; specifically, the technical defects of insufficient control precision and limited application range during dynamic drift of a bias point and switching of a modulation format in the prior art are overcome.

The invention belongs to the technical field of optical fiber communication and coherent optical communication, and discloses a multi-residual carrier modulation method, demodulation method and system. The system comprises a transmitting end and a receiving end, the transmitting end comprises a mapping module and a modulator; the mapping module is used for modulating and mapping a to-be-sent digital signal and generating a corresponding modulation signal; the modulator modulates an optical carrier according to the modulation signal to obtain a modulated optical signal; introducing an optical carrier component comprising a plurality of optical carriers into the modulated optical signal to form a composite optical signal comprising the modulated optical signal and a residual carrier component; the receiving end comprises a detection module, a compensation module and a signal recovery module; the detection module performs beat frequency on the received composite optical signal and local oscillation light to realize coherent detection to obtain an electric signal; the compensation module compensates the electric signal; and the signal recovery module filters the compensated signal, and performs phase noise compensation on the signal by using any residual carrier component in the residual carrier components obtained by filtering to obtain a signal after phase recovery.

The application discloses a kind of underwater acoustic communication method, device, electronic equipment and system, the underwater acoustic communication method includes: obtaining first communication data;The first communication data is encoded by low-density parity-check code, and coding data is obtained;The carrier modulation is carried out to the coding data, and first modulation signal is obtained;The sound track angular momentum modulation is carried out to the first modulation signal, and second modulation signal is obtained;The second modulation signal is sent to receiving end by underwater acoustic channel.This application solves the technical problem that underwater acoustic communication spectrum utilization is lower.

The invention relates to the technical field of power electronic equipment stability and optimization control research, and provides a novel networking control method for improving the synchronous stability of a current converter. The method comprises the following steps: acquiring an active power measurement value output by a common coupling point converter, inputting the active power measurement value into an active synchronization ring, and generating a common coupling point voltage phase reference value; obtaining an active power difference value between the output active power measurement value and the active power reference value, and inputting the active power difference value into a proportional controller to obtain an output current d-axis component reference value; obtaining a reactive power difference value between a reactive power measurement value output by the common coupling point converter and a reactive power reference value, and inputting the reactive power difference value into a proportional-integral controller to obtain an output current q-axis component reference value; acquiring a d-axis component measured value and a q-axis component measured value of the output current, and inputting a d-axis component reference value and a q-axis component reference value of the output current of the converter into a vector current controller, so as to obtain a d-axis component reference value and a q-axis component reference value of the output voltage of the converter; and performing Parker inverse transformation on the d-axis component reference value of the output voltage and the q-axis component reference value of the output voltage to generate a modulation signal, and finally generating a PWM signal of the converter through a triangular carrier modulation mode.

Provided in the present application are a modulation method and modulation apparatus for a cascaded energy storage system, and a storage medium. The cascaded energy storage system comprises N sub-modules connected in a cascade mode, where N≥2. The modulation method comprises: according to N carriers, modulating waveform signals that are output by N sub-modules, wherein the N carriers correspond to the N sub-modules on a one-to-one basis; and during modulation, performing at least one instance of synchronization delay on the N carriers, so as to synchronously change initial phase angles of the N carriers, wherein during the synchronization delay, the amplitudes of the carriers remain unchanged.

The application discloses an Ethernet carrier modulation and demodulation circuit, a laser bus controller and a system. The Ethernet carrier modulation and demodulation circuit is integrated with a double-isolation power supply and comprises a network isolation unit and a coupling modulation and demodulation unit. The network isolation unit is used for electrically isolating a first group of TX differential signals and a first group of RX differential signals to obtain a second group of TX differential signals and a second group of RX differential signals after isolation. The coupling modulation and demodulation unit is used for coupling and modulating the second group of TX differential signals and an external direct-current system power supply into active Ethernet TX carrier signals and decoupling and demodulating the second group of RX differential signals and an external direct-current driving power supply into active Ethernet RX carrier signals. Thus, the electrical wiring mode can be simplified, the power supply interference of the laser equipment is reduced, and the integration degree and the communication speed of the laser equipment are improved.