36 results about "Pre distortion" patented technology

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.

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.

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 application discloses a terminal cooperative digital pre-distortion strategy system and belongs to the technical field of wireless communication. The digital pre-distortion module and the terminal module work cooperatively, a specific sequence is inserted at a fixed position, more effective data is provided for the pre-distortion module, the pre-distortion module modeling is more accurate, and a more suitable strategy decision is made for a fast changing scene. The system comprises a state monitoring module, a digital pre-distortion module, a parameter evaluation module, a terminal module and a front end module, the working state of the system is detected, the pre-distortion module is started according to requirements, the characteristics of forward and feedback signals are analyzed, whether the signals are suitable for pre-distortion modeling is judged, and the look-up table data is detected to guarantee the accuracy of the pre-distortion coefficient. The application can realize the interaction and cooperative work of the terminal module and the digital pre-distortion module, is more favorable to the establishment of a digital pre-distortion model, and has a better pre-distortion effect.

The present application relates to the technical field of wireless communications. Disclosed are a digital pre-distortion processing method and apparatus, and a terminal device and a computer storage medium. The digital pre-distortion processing method comprises: receiving original input data of a radio-frequency power amplifier; pre-processing the original input data to obtain compressed data; and performing nonlinear processing on the compressed data, so as to obtain output data as actual input data of the radio-frequency power amplifier.

The present disclosure relates to a communication apparatus and method for efficiently carrying out digital pre-distortion (DPD) on a transmission signal of a wireless communication system according to various operating conditions. The communication apparatus that carries out DPD on a transmission signal of a wireless communication system, according to an embodiment of the present disclosure, may comprise a power amplifier that amplifies the transmission signal. The communication apparatus may comprise a DPD apparatus that is connected to an input terminal of the power amplifier and carries out, on the basis of operating condition data of the communication apparatus, a DPD operation by using fake data generated for the transmission signal. The DPD apparatus may include a generator based on a conditional GAN. The generator may be configured to receive, as inputs, the operating condition data and input / output signals collected from the power amplifier and generate, on the basis of data acquired through repeated training of the conditional GAN using the collected input / output signals and the operating condition data, the fake data learned to compensate for nonlinear distortion at the output of the power amplifier.

The application discloses a DPD implementation method and system in a hybrid beamforming system, wherein a PA inverse transfer function parameter is estimated according to a PA baseband input signal and an output signal through a generalized memory polynomial (GMP) model, and digital pre-distortion DPD is implemented through a cascade digital pre-distortion architecture comprising a phase shifter parameter matrix module, a PA inverse transfer function module and a phase compensation module. The application significantly simplifies the hardware configuration of a feedback link, and can maintain excellent linearization performance without recalibration when the beam direction changes, and has strong robustness.

This invention discloses a dynamic frequency allocation method for wireless communication networks, belonging to the field of wireless communication processing technology. Through offline measurement and model identification, a quantitative relationship between the input signal of the preceding time slot and the nonlinear distortion at the current moment is established. Historical usage sequences of frequency bands and power are collected and stored in real time, providing the input signal characteristics of the preceding time slot for memory effect residual assessment. Combining the historical usage sequences with the memory effect model, the residual intensity of the memory effect in each frequency band is calculated in real time, providing a quantitative basis for frequency band scheduling. Protective time slots are set for high-residual frequency bands to avoid their use before the memory effect has completely disappeared. Low-residual frequency bands are preferentially allocated to high-power users through priority ranking. The memory effect residual of power amplifiers is compensated in real time by dynamically updating the predistortion coefficients. The predistortion coefficients are adjusted according to the preceding and current signal characteristics to ensure good predistortion performance in different operating scenarios.

A digital signal generator includes a numerically controlled oscillator (NCO) configured to generate a modulated phase signal, and to convert the modulated phase signal into a sinusoidal output signal, and a pre-distortion module configured to adjust a phase of the phase-modulated signal prior to conversion to the sinusoidal output signal, and to adjust an amplitude of the sinusoidal output signal to obtain a pre-distorted digital output signal. The phase and amplitude adjustments are frequency dependent, and the pre-distortion module is configured to determine an instantaneous frequency of the NCO by computing a derivative of the modulated phase signal, and to address a memory table correlating the determined instantaneous frequency with the phase and amplitude adjustments.

This invention belongs to the field of wireless communication and signal processing technology, and relates to a digital predistortion method, system, and application for power amplifiers in shortwave communication systems. This invention can cover the wide dynamic range of the power amplifier's operating range in shortwave communication systems, maintaining excellent linearization compensation across the entire power range. It effectively improves modulation signal distortion, spectral broadening, and adjacent channel interference, significantly reducing the system bit error rate and improving the quality of the transmitted signal, thus meeting the requirements for spectral and linearity specifications. This invention eliminates the need for multiple predistortion models and complex switching logic, greatly reducing system implementation complexity and storage resource overhead. When power levels switch or the signal envelope changes rapidly, it avoids additional distortion introduced by abrupt changes in predistortion parameters, ensuring continuous and stable linearization. Furthermore, this invention supports online adaptive updates, enabling real-time adaptation to changes in the nonlinear characteristics of the power amplifier, improving system robustness and environmental adaptability.

The application discloses a kind of on-chip transmitter wide temperature range AMAM and AMPM distortion measurement method and system.The method comprises: digital circuit generates the ladder signal containing multiple amplitude steps as test excitation;Signal is amplified after being transmitted link, and is coupled from power amplifier output end Feedback back to digital circuit;By analyzing the amplitude and phase relationship of input and feedback signal, calculate AMAM and AMPM distortion;While integrating resistance controllable resistance network and temperature sensor near power amplifier, achieve the purpose of accurately controlling chip temperature and real-time monitoring temperature;When temperature reaches multiple preset points, the above measurement process is triggered respectively, so as to obtain the distortion characteristics of transmitter in wide temperature range.The application can quickly and accurately obtain the AMAM and AMPM distortion data of on-chip transmitter under wide working temperature, provide basis for temperature adaptive digital pre-distortion, significantly improve the linearity and reliability of communication system.

This application discloses a digital predistortion calculation method, apparatus, storage medium, and electronic device. The digital predistortion calculation method includes: acquiring the input signal and corresponding output signal of a power amplifier; determining the nonlinear distortion characteristics of the power amplifier in the amplitude and phase domains based on the input and output signals to identify symmetry breaking modes characterizing the nonlinear distortion characteristics; mapping the symmetry breaking modes to a Lie algebra space, and analyzing the distortion mechanism constituting the symmetry breaking modes based on the Lie algebra space to obtain Lie algebra elements; performing exponential mapping operations on the Lie algebra elements to generate the corresponding symmetry recovery transform function; constructing a performance manifold based on the physical constraints and linearization performance indicators of the power amplifier, and geometrically optimizing the parameters of the symmetry recovery transform function on the performance manifold to generate the target predistortion signal.

This application discloses a digital predistortion (DPD) implementation method, system, device, and storage medium, relating to the field of radio frequency communication technology. The method includes: when the soft core receives a calibration start command, it first sends a sinusoidal calibration signal to the FPGA platform, triggering its initial calibration of the transmission link; after receiving a calibration confirmation signal from the FPGA, the soft core reads the pre-stored initial training modulation signal from its internal memory and sends it to the FPGA platform as transmission data; subsequently, it reads the feedback data after nonlinear distortion by the power amplifier from the FPGA via a high-speed bus; based on this feedback data and the initial training signal, the soft core iteratively updates the digital predistortion compensation parameters and updates the transmission data; the FPGA performs stable compensation on the power amplifier (PA) based on the updated transmission data. This method, through the collaboration of the FPGA and the soft core, tightly couples calibration, acquisition, caching, and updating, utilizes on-chip high-speed storage to avoid external memory access, and combines pipelined processing to significantly improve DPD accuracy, iteration efficiency, and resource utilization.

This application provides a radio frequency (RF) front-end module, relating to the field of RF technology. The RF front-end module includes a power amplification module, a signal coupling module, and a detection module. The signal coupling module includes a control unit and a bidirectional coupling circuit, which is connected between the power amplification module and the detection module. The control unit is configured to control the bidirectional coupling circuit to be in a conducting state. The bidirectional coupling circuit is configured to couple the RF signal on the signal transmission line of the power amplification module to the detection module. The detection module is configured to detect a pre-distortion signal based on the coupled signal transmitted by the bidirectional coupling circuit. This application achieves bidirectional coupling by coupling the transmitted and echo signals on the signal transmission line of the power amplification module to the detection module, thereby enabling accurate detection and feedback of the nonlinear characteristics of the power amplification module's core. Based on this, the pre-distortion signal determined is more accurate.

The application belongs to the field of analog integrated circuit design, and particularly relates to a redundant current range current steering DAC based on digital pre-distortion. The application carries out rotation correction through an improved DEM decoding circuit, measures and quantizes error codes corresponding to the static mismatch error of each current unit, and reduces the circuit area and the influence of additional circuit parasitic on the DAC speed without additional control circuit. A redundant current unit is introduced at the highest bit to expand the quantization range, and the error code and clipping problem introduced by DPD correction are solved. Only a simple algorithm of a 14-bit adder and a 14-bit subtractor is needed to directly operate on binary codes, and a secondary decoding is used to realize thermometer code addition operation compatible with DEM, so that the timing delay and circuit complexity of the thermometer code addition circuit are greatly reduced. The circuit timing delay of the application meets the speed requirement of high-speed and high-precision current steering DAC, and compared with DEM correction only, the application significantly improves the SFDR without raising the noise floor.

Provided are a system and a method for generating digital pre-distortion (DPD). The method includes receiving, by a processing circuit of a user equipment (UE), a first signal, receiving, by the processing circuit, a second signal generated based on an output of a power amplifier of the UE, performing, by the processing circuit, a modified least-squares operation based on the first signal and the second signal to generate a set of DPD coefficients, the performing of the modified least-squares operation including performing one or more operations on the first signal and the second signal, such that amplitudes of the set of DPD coefficients satisfy an amplitude upper bound, generating a third signal based on the set of DPD coefficients, and transmitting the third signal from the processing circuit.

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.

Systems and methods for analog predistortion (APD) in power amplifiers are disclosed. In one aspect, APD may be provided in a front-end module (FEM) of a transmitter. More specifically, the APD may include different predistortions based on where within a frequency band the signal to be distorted is operating (i.e., sub-band APD). The APD in the FEM may further be based on operating conditions such as temperature within the FEM. Still further, the FEM may be configured to apply different APD based on whether or not a baseband processor (BBP) applies digital predistortion (DPD). At a minimum, the provision of the APD may make the operation of a power amplifier in FEM more linear. Further, where DPD is present, the use of the APD may simplify the requirements for the DPD provided in the BBP.

The application belongs to the technical field of radio frequency power amplifier overheat protection, in particular to a self-adaptive temperature sensing power amplifier tube protection method and system, wherein the method comprises: establishing a nonlinear time-varying thermal model of the power amplifier tube; before transmitting a pulse, calculating a heat consumption function of heat consumption changing with time according to the pulse input power and the pre-labeled power-heat consumption relationship; collecting the working temperature of the power amplifier tube in real time, and comparing it with the model predicted temperature to obtain a temperature error; correcting the thermal model parameters and the temperature rise function in real time according to the error through an adaptive filter; generating static bias compensation and dynamic baseband pre-distortion signals based on the corrected temperature rise function, and pre-distorting and compensating the input signal. The application overcomes the defects of large error of traditional linear thermal model and open-loop compensation without feedback, realizes high-precision and self-adaptive temperature protection and linearization, and is particularly suitable for magnetic resonance imaging and communication systems.

A compensator compensates for distortion of a power amplifier circuit. A power amplifier neural network (PAN) is trained to model the power amplifier circuit using a predetermined input and output signal pair characterizing the power amplifier circuit. The compensator is then trained to pre-distort a signal received by the PAN. The compensator uses the trained neural network to optimize a loss between an input to the compensator and an output of the PAN, and the loss is computed according to a multi-objective loss function including one or more time-domain loss functions and one or more frequency-domain loss functions. The trained compensator performs signal compensation, outputting a pre-distorted signal to the power amplifier circuit.

The application discloses a high-speed optoelectronic communication signal transmission method based on terahertz waves, and relates to the technical field of optoelectronic communication, constructs a full-link reference transmission model, realizes super-high-speed and high-reliability terahertz optoelectronic communication transmission through full-link loss pre-compensation of a transmitting end, dynamic closed-loop updating and residual loss sparse equalization of a receiving end, and has the advantages that a device and channel joint reference transmission model covering a full link of terahertz optoelectronic communication is constructed, reverse pre-distortion processing of full-link linear and nonlinear transmission loss is completed at a signal transmitting source, and a model dynamic closed-loop updating mechanism based on real-time states in a transmission process is simultaneously used, so that a long-standing technical prejudice of single-link discrete optimization in the field is broken through, a serial discrete transmission architecture commonly used in the prior art is completely abandoned, and inherent technical contradictions that transmission rate improvement is inevitably accompanied by signal-to-noise ratio deterioration, error code rate soaring and transmission distance sharply decreasing are fundamentally broken.

According to the present invention, a transmission device for reducing power consumption of a power amplifier may estimate a signal characteristic value corresponding to a peak-to-average power ratio for each of a plurality of OFDM symbols on the basis of signal power in a frequency domain. The transmission device may determine, on the basis of the estimated signal characteristic value, whether each OFDM symbol is in a powerless state or the estimated signal characteristic value is less than a preset reference value. The transmission device may control, on the basis of the determined result, whether to operate the power amplifier for each OFDM symbol. The transmission device may determine, on the basis of the determined result, whether to perform clipping and filtering on each of the OFDM symbols. The transmission device may determine, on the basis of the determined result, whether to perform digital pre-distortion on each of the OFDM symbols.

Methods and systems for AI-based digital pre-distortion for digital envelope tracking power amplifiers. A method includes receiving a measurement of a digital envelope at a digital predistortion module having a neural network (NN)-based digital predistortion structure for a digital envelope tracking (DET) system, receiving a transmit signal at the digital predistortion module, inputting the measurement of the digital envelope and the transmit signal into a generalized memory polynomial (GMP) model of the AI-based digital predistortion structure to produce a pre-distorted transmit signal, processing the pre-distorted transmit signal using an AI model of the AI-based digital predistortion structure to produce an adjusted pre-distorted transmit signal to correct one or more non-linearities in a power amplifier operable coupled to the digital predistortion module, and generating an output signal using the power amplifier based on the adjusted pre-distorted transmit signal.

A method for determining a plurality of digital pre-distortion, DPD, models. The method comprising obtaining test data indicating a set of test cases. The method further comprising dividing the set of test cases into subsets of test cases. The method further comprising determining a DPD model for each subset of test cases, thereby determining the plurality of DPD models.

The application provides a nanosecond micro-impulse generation method for chip electrostatic tolerance, relates to the technical field of detection systems, and establishes a low-energy linear channel model and a segmented nonlinear channel model of a triggered electrostatic protection clamp for a target test port of a measured chip, discretely decomposes a pre-distortion excitation instruction into a charge packet sequence containing a charge amount parameter, an energy parameter and a release time parameter, injects and forms a nanosecond micro-impulse waveform according to the release time, performs wideband sampling on port voltage and current, obtains an actual port waveform based on double-model inversion compensation, calculates an error, and updates the charge packet sequence in a closed loop until convergence output is obtained, meanwhile, port impedance and leakage response criterion extraction are realized through a pre-processing section, a main impulse section and a latch detection section, which are used for distinguishing soft breakdown and hard breakdown and generating a multi-port sensitivity distribution, and the method has the characteristics of controllable, reproducible and traceable waveform.