228 results about "Pre distortion" patented technology

The invention belongs to the technical field of semiconductor testing, and discloses a novel automatic detection system and method for the electrostatic protection performance of a power device. A distributed parasitic parameter network model is constructed by acquiring packaging structure parameters of a to-be-tested power device and physical layout data of a test fixture, key parasitic parameter distribution is identified in combination with a time domain reflection measurement technology, a waveform distortion coefficient is calculated, and a spatio-temporal evolution model of electrostatic pulse propagation is constructed. Based on the model, a compensatory predistortion waveform is generated to counteract the parasitic effect of a transmission path, a device port response signal is collected in real time, an energy dissipation characteristic spectrum is extracted through wavelet packet decomposition, and quantitative evaluation of the electrostatic protection performance is achieved. According to the invention, the test precision and repeatability are improved, and the method is suitable for electrostatic protection tests of various novel power devices, especially high-frequency wide-band gap devices.

The invention discloses a high-precision power supply output correction method based on a digital pre-distortion technology, and relates to the technical field of power electronics, and the method comprises the steps: integrating an electricity-heat-magnetism real-time combined observer, and inputting parameters including a power supply output voltage, a current, a power device junction temperature, a magnetic element surface temperature, an environment temperature, and an input voltage ripple; using a hierarchical memory depth pre-distortion compensator to generate an anti-phase pre-distortion signal containing long time domain thermal constant compensation and short time domain capacitance energy storage compensation based on modeling engine output; based on a double-ring adaptive updating module, an inner ring updates electrical parameters, including on resistance and dead time, by taking a switching period as a reference, and an outer ring updates thermomagnetic parameters, including thermal resistance and a magnetic core saturation point, in a minute-level period; and the DAC is connected in series with a pre-distortion signal output end through an anti-interference execution channel, and comprises a noise shaping DAC and a driving stage for delay matching. According to the invention, through an electric-thermal-magnetic three-field combined observation architecture, the limitation of traditional single physical field monitoring is broken through.

The invention discloses a digital pre-distortion method, system and device and a storage medium, and relates to the technical field of aerospace communication. The method comprises the following steps: acquiring a first input signal and a first actual output signal of the power amplifier, and acquiring a thermal state characteristic; constructing a three-dimensional dynamic baseline; superposing the detection sequence into the first input signal to obtain a second input signal, obtaining a corresponding second actual output signal, and predicting an ideal output signal of the second input signal; extracting a harmonic component generated after the detection sequence passes through a power amplifier, and determining a distortion early warning moment; recording a third input signal after the distortion early warning moment; constructing a virtual test signal according to the third input signal, and predicting to obtain a reference output signal; and comparing the difference between the distortion output signal and the reference output to obtain a distortion feature vector, constructing a dynamic increment compensation function, and correcting the signal processing flow of the power amplifier based on the dynamic increment compensation function. And the accuracy of digital pre-distortion is improved.

The invention belongs to the field of quantum computing, and particularly relates to a distortion correction optimization method and device for a quantum measurement and control link, and the method comprises the steps: applying a frequency control signal for loading a target pre-distortion waveform on a to-be-corrected quantum measurement and control Z link; setting a first logic gate for quantum state operation on an XY control line of the selected quantum bit; obtaining the fidelity of the quantum state output by the selected quantum bit; in response to the fact that the fidelity does not reach the preset standard, updating the pre-distortion waveform, and returning to execute a frequency control signal for applying and loading the target pre-distortion waveform signal on the quantum measurement and control Z link to be corrected; and setting a first logic gate for quantum state operation on an XY control line of the selected quantum bit until the fidelity reaches a preset standard. According to the invention, distortion correction can be rapidly and effectively carried out.

The invention relates to the technical field of data processing, and discloses a digital feedback dynamic adjustment method and system for a neutron generator control signal, and the method comprises the steps: calling a reconfigurable waveform parameter set corresponding to a target neutron from a mapping relation according to the yield and beam spot characteristic demands of the target neutron; generating a basic high-frequency pulse sequence of the neutron tube, and performing pre-distortion filtering on the basic high-frequency pulse sequence to obtain a high-frequency pulse sequence of the neutron tube; collecting an anode current and a target voltage signal of the neutron tube applied with the high-frequency pulse sequence during operation, and converting the anode current and the target voltage signal into a digital feedback current; comparing the digital feedback flow with a reference waveform in the reconfigurable waveform parameter set in real time to obtain an error correction amount of the high-frequency pulse sequence; dynamically adjusting the high-frequency pulse sequence according to the error correction; applying the dynamically adjusted high-frequency pulse sequence to a corresponding electrode in a neutron tube through power; the neutron tube control signal processing efficiency can be improved.

Methods, systems, and apparatus for microwave pulse distortion compensation using reflection parameters from error amplification pulse sequences. In one aspect, a method includes generating a pre-distorted control signal that implements a single qubit rotation operation and applying the pre-distorted control signal to a qubit to perform the rotation operation on the qubit. The pre-distorted control signal comprises an inverted transfer function, where the inverted transfer function comprises values of parameters obtained through fitting measured qubit parasitic rotation angles per gate to a reflection model that models pulse distortion in the quantum computing device; and the qubit parasitic rotation angles per gate are measured using a first pulse sequence that amplifies out-of-phase pulse distortion in the quantum computing device and a second pulse sequence that amplifies in-phase pulse distortion in the quantum computing device.

Methods and systems for NN-based digital pre-distortion for digital envelope tracking power amplifiers. A computer-implemented method includes receiving a measure of a digital envelope at a digital pre-distortion module having a neural network (NN)-based digital pre-distortion structure for digital envelope tracking (DET), receiving a transmit signal at the digital pre-distortion module, inputting the measure of the digital envelope and the transmit signal into the NN-based digital pre-distortion structure to produce a pre-distorted transmit signal, adjusting nonlinearity compensation of a power amplifier based on the measure of the digital envelope, and using the adjusted nonlinearity compensation of the power amplifier to produce an output signal.

The invention belongs to the technical field of magnetic variable measurement, and particularly relates to a power driving compensation method and system for magnetostrictive load characteristic monitoring, and the method comprises the steps: obtaining a reference zero point of magnetic performance evolution in a cold state environment of an electromagnetic system according to the center frequency of the electromagnetic system; calculating a current main frequency impedance module value and a phase difference through an electrical parameter characterization method, and obtaining a thermal drift index reflecting a hysteresis loop distortion degree in combination with a reference zero point; obtaining correction factors of all orders based on the thermal drift index and the average output power at the current moment, and dynamically updating a coefficient vector of the inverse model; and constructing a pre-distortion driving voltage signal capable of counteracting nonlinear interference by using the new coefficient and the ideal guided wave voltage sequence, and inputting the pre-distortion driving voltage signal to a power amplifier to drive the magnetostrictive transducer. According to the invention, the problem of predistortion failure under a variable-temperature working condition in the prior art is solved, and the signal-to-noise ratio of high-power long-distance guided wave detection is remarkably improved.

Systems and techniques are provided for power amplifier gain error compensation for a Digital Power Amplifier (DPA). In some aspects, a compensation method includes obtaining in-phase (I) and quadrature-phase (Q) components of a baseband sample corresponding to in-phase input amplitude codes and quadrature-phase input amplitude codes. The in-phase input amplitude codes can be distorted based on first gain pre-compensation information corresponding to an in-phase signal branch of the DPA, to generate pre-distorted output amplitude codes of the I component. The quadrature-phase input amplitude codes can be distorted based on second gain pre-compensation information corresponding to a quadrature-phase signal branch of the DPA, to generate pre-distorted output amplitude codes of the Q component. The DPA can be driven using the pre-distorted output amplitude codes of the I and Q components to generate a Radio Frequency (RF) output.

Aspects relate to signaling relating to a non-linearity model for power amplifier circuitry of a transmitting device. The power amplifier circuitry may apply digital pre-distortion (DPD) to a signal prior to amplification and transmission of the signal. A receiving device may apply digital post-distortion (DPoD) to a signal received from the transmitting device where the DPoD is based on the non-linearity model. The transmitting device may send to the receiving device non-linearity parameters for the non-linearity model.

The invention discloses a high-linearity low-noise amplifier based on harmonic suppression, relates to the field of communication and the technical field of electronic devices, and is used for solving the problem that the noise coefficient of an existing Darlington structure is large. Comprising a noise matching and input matching network, a linearity enhancement structure, a negative feedback structure and a pre-distortion structure. Wherein the linearity enhancement structure at least comprises a first amplification transistor and a second amplification transistor which are arranged in parallel, and is used for improving the linearity of the circuit through harmonic cancellation; the negative feedback structure is connected with the noise matching and input matching network and the pre-distortion structure and is used for expanding circuit bandwidth and optimizing output matching; the pre-distortion structure is used for stabilizing the bias voltage of the third amplification transistor. According to the invention, the linearity of the whole circuit is effectively improved, and the source microstrip lines of the two circuits are utilized to improve the minimum noise matching and improve the noise performance. Noise is reduced, linearity is improved, low-frequency gain is suppressed, and bandwidth of the whole circuit is improved.

According to embodiments, a method performed by an electronic device includes: identifying a channel bandwidth; identifying one or more active DPD units among a plurality of DPD units of a digital pre-distortion (DPD) circuit based on the channel bandwidth and amount of resource allocated within the channel bandwidth; generating a DPD output signal of the DPD circuit based on the one or more active DPD units; generating an amplifier output signal based on the DPD output signal of the DPD circuit, a digital-to-analog converter (DAC), and a power amplifier (PA). While the DPD output signal is generated, at least one DPD unit different from the one or more active DPD units among the plurality of DPD units of the DPD circuit is deactivated.

The invention belongs to the field of quantum computing, and particularly relates to a distortion correction optimization method and device for a quantum measurement and control link. The method comprises the following steps: determining a digital filter for distortion correction or a pre-distortion waveform output by the digital filter and used for compensating distortion based on a target parameter value of a target system function fusing quantum measurement and control link signal response characteristics; acquiring an output signal of the quantum measurement and control link provided with the digital filter; and in response to the condition that the output signal does not reach the preset standard, updating the target parameter value or the pre-distortion waveform, and returning to execute the step of acquiring the output signal of the quantum measurement and control link provided with the digital filter until the output signal reaches the preset standard. According to the invention, distortion correction of the quantum measurement and control link can be effectively realized.

The invention discloses a pre-distortion calibration method and system based on a single chip microcomputer, a medium and a product, and relates to the field of radio frequency front ends. The method comprises the following steps: extracting an instantaneous amplitude value of an input signal sequence to obtain a first envelope to represent instantaneous nonlinearity; the periodic average power of the input signal is calculated and filtered through timer interruption, and a second envelope representing the heat effect is obtained. According to the method, the first envelope and the second envelope serve as double indexes, the preset two-dimensional lookup table is inquired, so that the pre-distortion calibration coefficient capable of being matched with the instantaneous nonlinearity and the thermal memory effect of the power amplifier at the same time is determined, and the input signal is calibrated. In addition, a feedback signal output by the power amplifier is obtained to calculate a distortion calibration error, and the two-dimensional lookup table is adaptively updated according to the error. According to the scheme, a composite calibration model is constructed on a low-cost single-chip microcomputer platform, and the accuracy and stability of nonlinear pre-distortion calibration of the power amplifier are guaranteed.

The invention discloses a coupling pulse distortion compensation method for superconducting quantum computing, and relates to the field of signal processing, and the method comprises the steps: S1, inputting an initial square wave signal into a first IIR filter, and reducing the frequency attenuation of superconducting quantum bits; s2, outputting the initial square wave signal to a second IIR filter to improve the high-frequency component of the initial square wave signal; s3, outputting the initial square wave signal to a third IIR filter to eliminate pulse back edge reflection of the initial square wave signal; and S4, outputting the initial square wave signal to a first FIR filter to carry out ripple correction so as to complete pre-distortion correction. By setting the staged pre-distortion compensation of the three-section IIR filter and the one-section FIR filter, the pre-distortion compensation of the square wave signal is more accurate and stable, the square wave edge response is rapid and the amplitude is correct, and the time delay and the amplitude error caused by the link are reduced; the quantum bit Z-axis phase control method has the advantages that quantum bit Z-axis phase control is more accurate, and the fidelity of a square wave signal gate is prevented from being reduced.

The invention provides an intelligent audio power amplifier system and a working method thereof. The working method comprises the steps that a dynamic noise suppression module enables an input signal after reverse noise injection to enter a distortion compensation module; a distortion compensation signal is synthesized by using a distortion compensation module; the life cycle parameter self-calibration module calibrates parameters and inputs the parameters to the dynamic noise suppression module and the distortion compensation module; the dynamic noise suppression module is based on an intelligent learning method and adopts a frequency band channel network, a time sequence channel network and a fusion layer; the life cycle parameter self-calibration module provides the temperature and the working time for the dynamic noise suppression module to optimize the time domain channel network and provides the temperature and the working time for the distortion compensation module to update the predistortion coefficient of the dynamic nonlinear distortion model; the output of the dynamic noise suppression module is provided for the distortion compensation module; and the output of the distortion compensation module is fed back to the dynamic noise suppression module. The problems of high-frequency noise interference, nonlinear distortion degradation and insufficient long-term stability are solved at the same time.

This specification describes methods, apparatus, and / or computer programs for selectively utilizing digital pre-distortion in a communication network. According to a first aspect of this specification, there is described a user device including means for transmitting an uplink reference signal to a network device without using digital pre-distortion; means for receiving, from a network device, an indication indicating whether digital pre-distortion is enabled or disabled for performance, by the user device, of subsequent uplink transmissions, wherein the transmitted uplink reference signal is useable for determination of the indication; and means for, when the indication indicates that digital pre-distortion is enabled for performance of subsequent uplink transmissions, performing one or more uplink transmissions using digital pre-distortion, and when the indication indicates that digital pre-distortion is disabled for performance of subsequent uplink transmissions, performing one or more uplink transmissions without using digital pre-distortion.

Certain aspects of the present disclosure provide techniques for beam-based pre-distortion training. An example method of calibration of a wireless communications device includes obtaining a first configuration that indicates a first set of beams for communication of one or more first calibration signals between the wireless communications device and a receiver. The method further includes obtaining an indication of the one or more first calibration signals communicated between the wireless communications device and the receiver. The method further includes obtaining one or more first parameters for distortion calibration associated with communications via one or more beams of the wireless communications device based at least in part on the one or more first calibration signals. The method further includes sending a first signal based on the one or more first parameters.

In one embodiment, an apparatus includes a baseband processor to generate a baseband signal and a digital pre-distortion (DPD) circuit to pre-distort the baseband signal with compensation information obtained from a lookup table. The lookup table may have a plurality of entries each to store a pre-distortion value, the lookup table to be addressed based on a target output power level of the baseband signal. The apparatus also may include a converter to convert the pre-distorted baseband signal to an analog signal and radio frequency (RF) circuitry comprising: a mixer to upconvert the analog signal to a pre-distorted RF signal, and a power amplifier to amplify the pre-distorted RF signal.

An antenna module may include antennas, RF chains connected to the antennas, a splitter / combiner connected to the RF chains, a mixer configured to upconvert an IF signal input to the antenna module into a transmission RF signal and output the upconverted signal to the splitter / combiner and / or to downconvert a reception RF signal which is a combination of signals from the RF chains provided from the splitter / combiner, a plurality of first couplers connected between the RF chains and the antennas, a second coupler for measuring a magnitude corresponding to a transmission RF signal before split by the splitter / combiner and / or the reception RF signal combined by the splitter / combiner, and a power detector configured to provide a plurality of magnitudes of a plurality of signals from the plurality of first couplers and a magnitude of a signal from the second coupler.

The invention discloses a low-complexity cascade predistortion device and method for out-of-band spectrum suppression. The device comprises a predistorter unit, a model identification and trimming unit, a subtracter, a DAC unit, a power amplifier PA, a transmitting antenna, an ADC unit, a power normalization unit and a filter. The predistorter unit comprises a plurality of stages of predistortion modules; and the model identification and trimming unit is used for carrying out modeling, screening and parameter extraction on each stage of pre-distortion module, outputting a screened coefficient model coefficient and feeding back the coefficient model coefficient to the pre-distorter unit. The method is oriented to strong distortion conditions and specified frequency band out-of-band suppression, is low in training sample requirement, is low in implementation complexity, and is convenient to deploy a digital pre-distortion technical route on general programmable hardware, so that the supervision and standard indexes are met, the energy consumption and the engineering cost are reduced, and the adaptability to complex and changeable scenes is improved.

There is provided mechanisms for operating a DPD for an access node. A method comprises receiving a plurality of input signals, each from a respective frequency band, wherein each signal is of memory order M. The method comprises, for each frequency band l=1, . . . , B of the frequency bands, generating a plurality of pre-distorted signals for the frequency band / based on the plurality of input signals coming from all the B frequency bands and using LUTs, according to which there is one LUT structure with LUT-based transforms per each combination of frequency band l=1, . . . , B and memory order m=0, . . . , M, wherein each of the LUT structures comprises combinations of LUTs of at most dimension B−q, where 1≤q≤B. The method comprises, for each frequency band l=1, . . . , B of the frequency bands, combining the plurality of pre-distorted signals for the frequency band to provide a combined pre-distorted signal for the frequency band.

The application discloses a digital pre-distortion processing method based on a lookup table, comprising: acquiring a first component and a second component of a baseband input to obtain an original digital baseband signal amplitude value according to the first component and the second component; when the original digital baseband signal amplitude value is greater than a first preset threshold, determining a corresponding lookup table index according to the original digital baseband amplitude value to obtain a first component increment and a second component increment for digital pre-distortion compensation; wherein the first component increment and the second component increment are determined through an AM-AM curve and an AM-PM curve, the AM-AM curve is used to determine the amplitude of a power amplifier to be mapped, and the AM-PM curve is used to determine the phase delay of the power amplifier to be mapped. Through the AM-AM curve and the AM-PM curve, the I component increment and the Q component increment can be accurately determined, so that the accuracy of digital pre-distortion compensation is improved. The judgment of the effectiveness of DPD compensation can avoid overflow of the compensated value bit width, thereby improving the compensation accuracy.

A method for compensating for nonlinear distortion of a signal, a model, and a communication system are disclosed. Based on a preset nonlinear compensation fusion model, digital pre-distortion (DPD), crest factor reduction (CFR) and error compensation are separately performed on an initial orthogonal frequency division multiplexing (OFDM) signal, and an initial OFDM signal after nonlinear distortion compensation is obtained accordingly. The nonlinear compensation fusion model may include a band limited-digital pre-distortion (BL-DPD) module, a band limited-crest factor reduction (BL-CFR) module and an error compensation module.

This application belongs to the field of wireless communication technology, specifically disclosing a transmitter system and method based on real-time feedback and pre-distortion EVM correction. The system includes: a digital pre-corrector, an RF transmit link, a feedback receive link, and a control module connected in sequence; the digital pre-corrector receives correction parameter information from the control module and performs pre-correction processing on the baseband signal according to the correction parameter information; the RF transmit link generates a target RF signal based on the pre-corrected baseband signal and transmits it; the feedback receive link receives the target RF signal and processes it into a feedback digital signal; the control module determines the EVM value of the target RF signal based on the baseband signal and the feedback digital signal, and updates the correction parameter information with the goal of minimizing the EVM value, thereby adjusting the quality of the target RF signal transmitted by the RF transmit link. This application can effectively improve the performance stability and modulation quality of the transmitter in complex operating environments.

The application belongs to the technical field of digital pre-distortion, and particularly relates to a digital pre-distortion method of an improved memory polynomial model based on an FFT convolution correlation function. The digital pre-distortion method adopts an improved memory polynomial model, adds a direct current term to correct errors caused by partial direct current bias, and adds a conjugate term to correct distortion caused by an image frequency. In a delay alignment module, a convolution correlation function method of fast Fourier transform (FFT) is used as a loop delay estimation algorithm. Compared with other correlation function loop delay estimation algorithms, the efficiency is greatly improved, and oversampling is not needed to improve accuracy.

Systems and techniques are provided for power amplifier gain error compensation for a Digital Power Amplifier (DPA). In some aspects, a compensation method includes obtaining in-phase (I) and quadrature-phase (Q) components of a baseband sample corresponding to in-phase input amplitude codes and quadrature-phase input amplitude codes. The in-phase input amplitude codes can be distorted based on first gain pre-compensation information corresponding to an in-phase signal branch of the DPA, to generate pre-distorted output amplitude codes of the I component. The quadrature-phase input amplitude codes can be distorted based on second gain pre-compensation information corresponding to a quadrature-phase signal branch of the DPA, to generate pre-distorted output amplitude codes of the Q component. The DPA can be driven using the pre-distorted output amplitude codes of the I and Q components to generate a Radio Frequency (RF) output.

The application is a divisional application of 202610037205.X, and discloses a signal processing method, device, equipment, system, storage medium and product. A to-be-processed signal output by a target signal after passing through a nonlinear device is processed in sections to obtain a plurality of first signal regions; a preset type determination strategy is used to determine region types to which the plurality of first signal regions correspond respectively, wherein the preset type determination strategy is determined based on a steepness of a waveform shape; for each first signal region, a compensation strategy matched with a region type corresponding to the current first signal region is used to compensate a sub-signal in a corresponding region of the target signal for the current first signal region by using an ideal signal, to obtain a compensation signal corresponding to the current first signal region; and a pre-distortion signal corresponding to the ideal signal is determined according to the compensation signals corresponding to the plurality of first signal regions respectively. The application can provide an effective pre-distortion signal for a signal with complex and changeable forms.

The invention provides a digital pre-distortion method and device, a storage medium and a computer program product, and the method comprises the steps: carrying out the sampling of a first signal through employing a non-uniform sampling period and a non-uniform sampling interval in the non-uniform sampling period, and obtaining a first sampling signal; determining a frequency domain signal corresponding to the first sampling signal, and determining a fitness value of the frequency domain signal; and under the condition that the fitness value of the frequency domain signal meets a preset condition, continuously performing digital pre-distortion processing by using the first sampling signal. The hardware implementation difficulty can be reduced, and aliasing is resisted.

The present disclosure provides a low-distortion PAM-4 optical transmitter with a piecewise compensation scheme for VCSEL-based optical communication links. The input half-rate least significant bit (LSB) and most significant bit (MSB) data streams of the transmitter are firstly encoded into half-rate unary-weighted data streams by thermometer encoders. The half-rate unary-weighted data streams are then fed into three data slices with 2-tap feed-forward equalizer (FFE), continuous-time linear equalizer (CTLE), pre-emphasis circuit for serialization and piecewise pre-distortion. Finally, outputs from the three data slices are added in the form of current and fed into VCSEL. A thermal control loop is implemented to monitor the temperature of the VCSEL as well as provide compensation to the bias current of the VCSEL.