28 results about "Polar modulation" patented technology

The invention discloses a soft switching HERIC non-isolated inverter and a modulation method thereof, and belongs to the technical field of inverters, the inverter comprises a bridge arm circuit, a clamping circuit, a resonance circuit, a voltage stabilizing circuit and a filter circuit, the resonant circuit comprises a first auxiliary switch tube, a second auxiliary switch tube, a third auxiliary switch tube, a fourth auxiliary switch tube, a first resonant inductor, a second resonant inductor, a first resonant capacitor and a second resonant capacitor; all high-frequency switches realize zero-current turn-on and turn-off at the same-direction stage of the voltage and the current of the power grid through the resonance circuit; all the high-frequency switches also realize zero-current switching on and switching off in the voltage and current reverse phase of the power grid; according to the modulation method, unipolar PWM modulation is adopted, the grid-connected current harmonic distortion rate is reduced, the grid-connected electric energy quality is improved, and the application value and prospect are huge.

The invention discloses a control system of a Helic bridge single-phase energy storage inverter in the technical field of power electronics, and the system comprises a voltage outer loop periodic error iterative correction QPR regulator which is used for carrying out the quasi-proportional resonance regulation and periodic error iterative correction processing of a voltage error signal to generate a reference current signal; the current inner loop load disturbance feedforward PR regulator is used for carrying out proportional resonance regulation and feedforward control error correction processing on the current error signal to obtain a control signal; and the pulse driving controller is used for generating a PWM (Pulse Width Modulation) signal by performing time domain conversion, phase delay and same-side unipolar modulation processing on the control signal and comparing the control signal with a carrier signal, and controlling the on-off of a switching tube in the Herac bridge module after the PWM signal is amplified by a driving circuit so as to realize accurate control on the output voltage and current of the inverter. The stability and reliability of the energy storage inverter system are improved, and the electric energy conversion efficiency is improved.

A method is disclosed for programming analog-valued weights in a non-volatile memory array using feedback-based estimation and adaptive pulse modulation. The method includes initializing a target weight, applying one or more programming pulses to a memory cell, estimating a weight state of the memory cell based on analog-to-digital conversion, determining a residual error between the estimated weight state and the target weight, and computing a subsequent programming pulse based on the residual error. The subsequent pulse may be adjusted by selecting a programming voltage from a quantized set of levels responsive to the recent weight response dynamics. The programming process may iterate until convergence may be achieved within a defined threshold. The technique supports precise control of conductance programming using closed-loop feedback and may be compatible with pulse-width, amplitude, and polarity modulation schemes.

The invention discloses a magnetic field modulation electro-magnetic excitation motor current harmonic suppression method based on voltage compensation. The method comprises the steps of obtaining self-inductance off-line data of an excitation winding according to an actual measurement or simulation result; calculating an average value, a harmonic order and an amplitude characteristic quantity based on excitation winding self-inductance off-line data; calculating an actively injected compensation voltage value in combination with the characteristic quantity and position and current information fed back in real time; superposing the compensation voltage value with the output voltage of the original PI controller to obtain a new reference voltage; a bipolar modulation method is adopted, a modulation wave and a carrier wave which are obtained through reference voltage are compared, a driving signal of an H-bridge switching tube is obtained, and therefore an exciting winding is driven to generate current after harmonic suppression. The invention provides a general harmonic suppression method suitable for a magnetic field modulation brushless electro-magnetic motor, and the method is easy to realize, can effectively suppress the current harmonic of an excitation winding, and guarantees the operation efficiency and stability of the motor.

The application provides a device and a method for realizing PON rate adjustment based on Polar modulation, and relates to the technical field of passive optical networks.The device comprises a first external cavity laser, a second external cavity laser, a dual-polarization phase quadrature modulator, an arbitrary waveform generator, an erbium-doped fiber amplifier, a single-mode optical fiber, a variable optical attenuator, a coherent receiver and an oscilloscope.The method comprises the following steps: dynamically adjusting the number of information bits A, splicing check bits to form total information bits, optimizing the distribution of information bits and frozen bits according to the optical signal channel sorting result, performing polar encoding on the signal at the encoding end, and mapping the signal into a 16QAM code symbol sequence by using the Polar modulation technology; at the receiving end, calculating the LLR, calculating the path metric value of all paths and performing a pruning operation when the list width reaches a set value, and detecting the L candidate paths by using the CRC check after the decoding is completed.The application realizes flexible regulation and control of the transmission rate of different optical network units.

Polar transmitter calibration Various embodiments relate to a transmit and receive system using polar modulation, including: a transmitter configured to produce a transmit signal using modulation; a receiver configured to receive a transmit signal using in-phase / quadrature (IQ) processing; a Tx / Rx switch configured to loop a transmitted signal from the transmitter back to the receiver for calibration; and a controller configured to: command the transmitter to generate a real signal; command the Tx / Rx switch to loop the real signal back to the receiver to produce a first received signal; command the transmitter to generate an imaginary signal; command the Tx / Rx switch to loop the imaginary signal back to the receiver to produce a second received signal; determine a compensation parameter based on the first received signal and the second received signal; and command the receiver to compensate a third received signal based upon the compensation parameter.

The chaos filter-based polarity inversion time index multicarrier communication method and system of the present application comprises the following steps: generating LP bits and performing polarity conversion, and sending the polarity-converted LP bits into a chaos shaping filter; generating HP bits, performing polarity conversion and series-parallel conversion on the HP bits; generating index bits, performing polarity inversion on corresponding time periods in local time periods of each polarity modulation signal, and obtaining a final modulation signal; loading the reference signal and the final modulation signal into corresponding subcarriers, respectively; multiplying a received signal with a corresponding synchronous subcarrier; performing 0 threshold decision on the reference branch sampling signal; and recovering the HP bits and the index bits according to the detection result. The present application utilizes a chaos shaping filter to generate a chaos signal bearing low-priority LP bits, and transmits a reference signal and an information signal in a multicarrier mode; the joint transmission of multiple types of information is realized, and the transmission rate and energy efficiency of the system are improved.

The invention belongs to the field of sensorless operation control, and particularly relates to a double three-phase permanent magnet synchronous motor sensorless operation control method, which comprises medium-low speed control and medium-high speed control, the medium-low speed control comprises a high-frequency signal injection method, and the medium-high speed control comprises a sliding mode observer method. The transition interval adopts a weighting function for calculating a weight coefficient based on a cosine function for transition; the high-frequency signal injection method comprises the steps that pulsating high-frequency sinusoidal voltage is injected into the stator, high-frequency components in induced current are modulated through rotor salient polarity, zero and low-speed control is achieved, a phase discriminator structure is reconstructed to eliminate 180-degree position deviation during inversion, and a feed-forward loop is designed to suppress direct-current offset errors of acceleration and deceleration working conditions. The sliding mode observer method comprises the steps of extracting rotor position information through back electromotive force observation, combining smooth output of a phase-locked loop PLL, fusing disturbance suppression capability of an ESO (extended state observer) and noise robustness of the phase-locked loop PLL, and reducing position tracking lag when the rotating speed suddenly changes.

The present invention provides a unipolar modulated reactive zero-crossing current distortion control device and control method. The control device includes a totem pole topology, a control module, and a drive module. The control method includes: the control module receives a sampling signal for the totem pole topology and, based on the sampling signal, outputs a first high-frequency PWM signal and a second high-frequency PWM signal of the same frequency; the drive module outputs a power-frequency transistor drive signal based on the first high-frequency PWM signal and a high-frequency transistor drive signal based on the second high-frequency PWM signal; the high-frequency transistor in the totem pole topology is driven according to the high-frequency transistor drive signal, and the power-frequency transistor is driven according to the power-frequency transistor drive signal. The present invention outputs a high-frequency PWM signal of the same frequency based on the same sampling signal, achieves synchronous commutation of the power-frequency transistor and the high-frequency transistor, and improves current distortion at the zero-crossing point, particularly current distortion during reactive power output by a grid-connected inverter.

The invention discloses a time index communication modulator based on a chaotic filter, a demodulator and a method, the modulator adopts a dual information coding mechanism, a bit index bit is mapped to one of time slot positions, a bit 0 is inserted into the specific time slot, and bipolar modulation bits are transmitted at other time slot positions, so that hybrid modulation is realized. According to the invention, a symbol sequence generated by the PPM modulator is directly transmitted through a channel after pulse forming by adopting a chaos forming filter, a reference signal does not need to be transmitted, more data can be transmitted under the same transmission energy, the transmission efficiency is improved, chaos matching filtering is carried out on a received signal at a receiving end, sampling extraction is carried out at an optimal signal-to-noise ratio point, and the transmission efficiency is improved. The signal detection performance is maximized, and the anti-noise and anti-interference capability of the system is enhanced; compared with an existing second-order hybrid differential chaos shift keying system, the bit error rate of the system is reduced on the basis of not transmitting reference signals.

The invention relates to a differential Mach-Zehnder electro-optical modulator based on frequency equalization. The modulator comprises an input waveguide branch, an output waveguide branch, a Mach-Zehnder upper phase shift arm, a Mach-Zehnder lower phase shift arm and a traveling wave electrode, each phase shift arm comprises a basic modulation region, a like-polarity modulation region and a reversed-polarity modulation region which are sequentially connected in series and are spatially arranged in parallel to form a folded arrangement structure; the traveling wave electrode is used for applying a first polarity electric field to the basic modulation area and the homo-polarity modulation area, and applying a second polarity electric field opposite in direction to the reversed polarity modulation area. By adopting the scheme, frequency equalization phase modulation is realized in a compact folding structure, and the electro-optical bandwidth of the modulator can be obviously expanded while the size of the device is reduced.

The invention discloses a thermal balance control method, system, device and equipment for bridge arm switching, and a medium, and the method comprises the steps: constructing a control vector set based on a modulation wave, generating a first control command and a second control command of a positive half cycle of the modulation wave according to the control vector set, generating a third control command and a fourth control command of the negative half cycle of the modulation wave according to the control vector set; obtaining heat data of the H-bridge circuit; and according to the heat data, dynamic switching of a first control command and a second control command is carried out in the positive half cycle of the modulating wave, and dynamic switching of a third control command and a fourth control command is carried out in the negative half cycle of the modulating wave. Bridge arm thermal balance can be realized while the advantage of high efficiency of unipolar modulation is kept, so that the reliability and the power density of a power supply system are improved.

A LiFi transmitter has first and second light emitting elements with different optical characteristics (wavelengths or polarizations). A bias circuit sets an operating point and sets bias conditions (e.g. a bias current) for the first and second light emitting elements. A first polarity of a modulation current (e.g. positive) is driven through the first light emitting element and a second polarity of the modulation current (e.g. negative) is driven through the second light emitting element, thereby to implement bipolar OFDM modulation. A corresponding receiver has first and second light sensing elements with different sensing characteristics and a bias circuit. A sensed difference current signal is amplified, and it is generated by the first or second light sensing element depending on the polarity of the OFDM modulation, thereby to implement bipolar OFDM reception.

A power converter and an inverter circuit control method. A modulation signal is output in a bipolar modulation scheme near a zero-crossing point of the modulation signal of an inverter circuit, to prevent some modulation signals from being lost due to reasons such as minimum on time and dead time of a switching transistor in the inverter circuit, and further prevent an output voltage of the inverter circuit from being distorted near the zero-crossing point. When a three-phase inverter circuit performs discontinuous pulse width modulation, a zero-crossing interval is prolonged, and distortion of the output voltage of the inverter circuit is more clear. In this case, quality of electric energy can be better improved by outputting the modulation signal in the bipolar modulation scheme.

A method is disclosed for programming analog-valued weights in a non-volatile memory array using feedback-based estimation and adaptive pulse modulation. The method includes initializing a target weight, applying one or more programming pulses to a memory cell, estimating a weight state of the memory cell based on analog-to-digital conversion, determining a residual error between the estimated weight state and the target weight, and computing a subsequent programming pulse based on the residual error. The subsequent pulse may be adjusted by selecting a programming voltage from a quantized set of levels responsive to the recent weight response dynamics. The programming process may iterate until convergence may be achieved within a defined threshold. The technique supports precise control of conductance programming using closed-loop feedback and may be compatible with pulse-width, amplitude, and polarity modulation schemes.

The invention provides a control method, a storage medium and a full-bridge inverter, and the control method is applied to the full-bridge inverter, and comprises the steps: switching and controlling the full-bridge inverter based on unipolar modulation and bipolar modulation; wherein the bipolar modulation covers an output zero crossing point of the full-bridge inverter; a compensation current value is obtained, and the compensation current value is a negative current change value of the full-bridge inverter in the switching process of unipolar modulation and bipolar modulation; and in the bipolar modulation process, compensating a preset extreme value of the inductive current of the full-bridge inverter based on the compensation current value. According to the control method provided by the embodiment of the invention, in the bipolar modulation process, the inductive current is compensated, so that the problem of current distortion caused by inconsistent volt-second balance during switching of unipolar modulation and bipolar modulation is avoided, the total distortion rate of current harmonics is reduced, and the current quality is improved.

The invention discloses a social recommendation denoising method based on a ternary resonance principle, bipolar perception and a polar modulation graph neural network. The method comprises the following steps: firstly, according to a ternary resonance principle, performing prior auditing on a social link by analyzing a user-article ternary interaction structure, and generating a topological mask to identify a high-confidence link; secondly, refining the original social graph by using the mask, and injecting the purified relationship as a structured prior into a user-article interaction graph for heterogeneous fusion; then, on the enhanced graph, through a bipolar perception and modulation graph neural network, utilizing a polarization modulation ordinal number to dynamically regulate and control information flow, and learning node characterization capable of distinguishing whether a user is good or not; and finally, constructing a composite objective function containing polarization ordinal number constraint and Bayesian personalized ordering, and optimizing the model by minimizing the function. Social noise can be effectively filtered, user positive and negative feedback is deeply modeled, and recommendation accuracy is remarkably improved.

The LiFi transmitter has a first light emitting element and a second light emitting element with different optical characteristics (wavelength or polarization). A bias circuit sets an operating point and a bias condition (e.g., a bias current) for the first and second light emitting elements. A first polarity (e.g., positive) of the modulation current is driven through the first light emitting element, and a second polarity (e.g., negative) of the modulation current is driven through the second light emitting element, thereby implementing bipolar OFDM modulation. A corresponding receiver has a first light sensing element and a second light sensing element with different sensing characteristics and a bias circuit. The sensed differential current signal is amplified and it is generated by the first or second light sensing element depending on the polarity of the OFDM modulation, thereby enabling bipolar OFDM reception.

The application discloses a time index communication modulator and demodulator based on a chaotic filter and a method thereof. The modulator adopts a double information coding mechanism, maps a bit index bit to one of time slot positions, inserts a bit 0 in the specific time slot, and transmits bipolar modulation bits in the remaining time slot positions, so as to realize hybrid modulation. The application directly transmits the symbol sequence generated by a PPM modulator through a channel after pulse shaping by using a chaotic shaping filter, does not need to transmit a reference signal, can transmit more data under the same transmission energy, improves transmission efficiency, performs chaotic matching filtering on a received signal at a receiving end, samples and extracts at a best signal-to-noise ratio point, maximizes signal detection performance, and enhances the anti-noise and anti-interference capability of the system. Compared with an existing second-order hybrid differential chaotic shift keying system, the application reduces the bit error rate of the system without transmitting a reference signal.

The invention relates to an OFDM-DCSK modulation and demodulation method and system based on chaos masking and diffusion scrambling encryption, and belongs to the technical field of communication. The method comprises the following steps: at a sending end, information bits to be transmitted are subjected to polarity modulation and serial-parallel conversion and then are subjected to diffusion and scrambling encryption processing with a pre-generated chaos reference sequence, reference signals are hidden in information carriers in a diagonal mode and then mapped to orthogonal subcarriers, and time domain signals are formed through inverse fast Fourier transform and are sent. After a receiving end receives a signal, serial-to-parallel conversion, fast Fourier transform, inverse scrambling, inverse diffusion, reference signal stripping, singular value decomposition and reconstruction and chaotic correlation detection are carried out in sequence, and finally information bit recovery is realized. According to the invention, the confidentiality and the anti-interference capability of the system can be effectively improved, the bit error rate is reduced, the spectrum utilization efficiency is improved, and the problems that the reference signal is easy to eavesdrop and the data rate is reduced in the prior art are avoided.

The embodiment of the invention provides a signal transmission method based on wireless energy, a storage medium and equipment. The method comprises the following steps: firstly, receiving an energy transmission signal; wherein the energy transmission signal comprises at least one digital identifier, the digital identifier is at least one of a first identifier and a second identifier, and the energy transmission signal is used for indicating a transmission signal from the primary side end to the secondary side end; the two modulation circuits are respectively a unipolar frequency multiplication modulation circuit and a unipolar modulation circuit; secondly, converting a digital identifier, corresponding to a modulation circuit, in the energy transmission signal into a modulation signal through the modulation circuit; wherein the modulation signal refers to a signal representing a digital identifier, and finally, according to the modulation signal, generating an alternating current signal used for synchronously transmitting energy and an energy transmission signal, and sending the alternating current signal to the secondary side end. The method is used for achieving the effects that the volume of the primary side end is prevented from being increased and the cost is low during wireless signal transmission.

The embodiment of the invention provides a signal transmission method for power supply, a storage medium, equipment and a program product. The method comprises the steps that a direct-current power supply and two modulation circuits are deployed in a primary side end, the direct-current power supply is used for generating a direct-current electric signal, and an energy transmission signal is received based on a preset time period; wherein the energy transmission signal is used for representing the power supply condition from the primary side end to the secondary side end. If it is determined that the energy transmission signal meets the preset condition, for each digital identifier in the energy transmission signal, determining a modulation circuit corresponding to the digital identifier as a target circuit; wherein the two modulation circuits are respectively a bipolar modulation circuit and a unipolar frequency multiplication modulation circuit; and through the target circuit, the direct-current signal of the direct-current power supply is converted into an alternating-current signal, and the alternating-current signal is sent to the secondary side end. The method is used for achieving the effects of avoiding increasing the physical size of the primary side end and avoiding increasing the hardware cost.

The invention provides a device and method for achieving PON rate adjustment based on Polar modulation, and relates to the technical field of passive optical networks, the device comprises a first external cavity laser, a second external cavity laser, a dual-polarization phase quadrature modulator, an arbitrary waveform generator, an erbium-doped optical fiber amplifier, a single-mode optical fiber, a variable optical attenuator, a coherent receiver and an oscilloscope; the method comprises the following steps: dynamically adjusting an information bit number A, splicing check bits to form total information bits, and optimizing the distribution of the information bits and freezing bits according to an optical signal channel sorting result; the method comprises the following steps: performing polarization coding on a signal at a coding end, and mapping the signal into a 16QAM coding symbol sequence by adopting a Polar modulation technology; at a receiving end, LLR is calculated, when the list width reaches a set value, path metric values of all paths are calculated and trimming operation is executed, and after decoding is completed, CRC verification detection is used for L candidate paths. According to the invention, the transmission rates of different optical network units can be flexibly regulated and controlled.

The present invention discloses a general multi-channel code shift differential chaos shift keying modulation and demodulation method and system, including: obtaining the information bits to be transmitted within the current symbol period, first performing Walsh code index modulation and polarity modulation, then using the CI code to perform secondary modulation on the modulated signal, adding the modulated signals and sending them to the demodulation system. The demodulation system first completes code index demodulation, then uses the inverse CI code for demodulation, and finally performs multiple correlation operations on each channel signal with other channel signals to obtain the optimal demodulation result. Through the present invention, the bit error performance of the system can be greatly improved.

This application discloses a synchronization signal processing method based on differential symmetric polarization sequences, comprising: the transmitter performing m symmetric polarization processing on the basic sequence to generate a signal of length 2. m The symmetric polarization sequence; through differential polarization modulation, the M basic sequences are combined to generate a synchronization frame of length M×N, where M=2. m +1, N is the length of the basic sequence; the receiving end performs time-domain matched filtering on the received signal based on the locally stored basic sequence to obtain a filtered signal; the filtered signal is split into two paths, one path is passed directly, and the other path is delayed by N clock cycles. The two signals are multiplied by conjugate, and the resulting primary processed signal is subjected to m iterations of delay-shift phase addition and subtraction processing to output the final correlation peak and determine the synchronization position. This invention also discloses a synchronization signal processing device, corresponding equipment, and storage medium based on differential symmetric polarization sequences. This application effectively overcomes carrier frequency offset and DC bias interference, saving hardware logic resources.

A power converter and an inverter circuit control method are provided. A modulation signal is output in a bipolar modulation scheme near a zero-crossing point of the modulation signal of an inverter circuit, to prevent some modulation signals from being lost due to reasons such as minimum on time and dead time of a switching transistor in the inverter circuit, and further prevent an output voltage of the inverter circuit from being distorted near the zero-crossing point. When a three-phase inverter circuit performs discontinuous pulse width modulation, a zero-crossing interval is prolonged, and distortion of the output voltage of the inverter circuit is more obvious. In this case, quality of electric energy can be better improved by outputting the modulation signal in the bipolar modulation scheme.

This application discloses a method, system, device, equipment, and medium for thermal equalization control of bridge arm switching. The method includes constructing a control vector set based on a modulation wave; generating a first control command and a second control command for the positive half-cycle of the modulation wave according to the control vector set; generating a third control command and a fourth control command for the negative half-cycle of the modulation wave according to the control vector set; acquiring thermal data of the H-bridge circuit; dynamically switching the first and second control commands during the positive half-cycle of the modulation wave according to the thermal data; and dynamically switching the third and fourth control commands during the negative half-cycle of the modulation wave. This method can achieve bridge arm thermal equalization while retaining the high efficiency advantages of unipolar modulation, thereby improving the reliability and power density of the power supply system.