5 results about "Power amplifier linearization" patented technology

The utility model relates to the technical field of radio frequency and microwave, in particular to a linearization circuit of a power amplifier, which comprises the power amplifier used for amplifying an input signal and providing required output power; the bias circuit is used for providing bias voltage for the power amplifier and controlling the change characteristic of a quiescent operating point of the power amplifier along with the temperature and the power; the active feedback circuit comprises a first connection point P1, a second connection point P2 and a third connection point P3, the active feedback circuit effectively reduces nonlinear distortion of the power amplifier through a negative feedback mechanism, and the nonlinear distortion of the power amplifier is effectively reduced by adjusting a first resistor R5, a second resistor R4, a third resistor R1 and a fourth resistor R3. The feedback circuit can be controlled to work in a critical region of a saturation region and a linear region, so that the linearity of the power amplifier can be optimized.

The application discloses a kind of based on KAN network's power amplifier linearization method and digital pre-distortion system, belong to wireless communication technical field, this method in digital pre-distortion processing process, introduced the Kolmogorov-Arnold Networks (KAN), constructs real time delay KAN digital pre-distortion network and real time delay KAN digital pre-distortion network;For real time delay KAN digital pre-distortion network, the input process of this network considers current time and previous time input signal, can correspond to the memory of power amplifier compensation;For vector decomposition time delay KAN digital pre-distortion network, on the basis of real time delay KAN digital pre-distortion network, further introduces phase recovery layer and fully connected layer, in the case where similar performance with previous KAN model is maintained, network complexity can also be simplified again;KAN digital pre-distortion method used in the application compared with original neural network-based digital pre-distortion method, use less network parameter, realize higher linearization capacity.

The invention discloses a multistage power amplifier linearization system based on broadband communication, which relates to the technical field of broadband communication and comprises a signal receiving module, an alignment module, a frequency domain analysis module, a behavior modeling module, a coefficient generation module, an updating module and a closed-loop control module. A frequency domain analysis module analyzes the aligned predistortion signal copy and the feedback signal in a frequency domain, and extracts cross-multi-sub-band nonlinear distortion and memory effect features; the behavior modeling module constructs and updates a broadband behavior model according to the model, and represents the overall nonlinearity of the multi-stage amplifier; and the coefficient generation module reversely solves a new predistortion coefficient, and after the new predistortion coefficient is applied by the updating module, closed-loop control continuous iteration is performed to realize dynamic correction. According to the system, broadband distortion is accurately captured through frequency domain cross-sub-band features, compensation is optimized through an overall nonlinear model, and output signal distortion of the multi-stage amplifier is restrained. According to the invention, the output linearity of the multi-stage power amplifier in a broadband communication scene is improved, and the anti-interference and spectrum efficiency of the system are enhanced.

FIELD: radio engineering.SUBSTANCE: device for digital linearization of a power amplifier is proposed, comprising a power amplifier, a linearizer, a digital-to-analogue converter connected to the first output of the linearizer, for converting a digital linearized signal for setting the power amplifier into an analogue signal for adjusting the gain of the power amplifier. A digital frequency synthesizer is introduced, the input of which is connected to the second output of the linearizer, and the output is connected to the input of a power amplifier, to the output of which an attenuator, a signal conversion device that converts a high-frequency signal into a low-frequency analogue signal, and an analogue-to-digital converter, the output of which is connected to the input of the linearizer, are connected in series, and the linearizer records the value corresponding to the specified power at the output of the power amplifier, which is then compared with the current values of the power of the power amplifier, supplied to the linearizer from the output of the analogue-to-digital converter.EFFECT: simplification of the digital linearization device of a power amplifier.3 cl, 2 dwg

The invention belongs to the technical field of data processing of the computer information disciplinary, and relates to a broadband power amplifier linearization method and system based on predistortion, and the method comprises the steps: collecting and preprocessing a radio frequency input baseband signal, an actual output baseband signal and tube core heat flow data of a broadband power amplifier, and obtaining an initial data set; calculating a transient heat dissipation gradient at each sampling moment based on the signal energy difference and the tube core temperature change rate; in combination with broadband distribution characteristics of radio frequency input baseband signals, broadband thermal teratogenesis factors at all sampling moments are obtained; performing dynamic tracking compensation on a cross term coefficient of a generalized memory polynomial based on the distortion factor to obtain an update coefficient; and the pre-distortion signal is reconstructed by utilizing the updating coefficient, so that high-linearity output of the broadband power amplifier is realized. The dynamic response speed of coefficient updating can be improved, thermally induced nonlinear distortion of a power amplifier is effectively offset, and the linearity and stability of a high-power broadband radio frequency test are improved.