A digital predistortion processing circuit and method applied to civil aviation ground-air data link

Abstract

The invention discloses a digital pre-distortion processing loop and method applied to civil aviation ground-air data links. The digital pre-distortion processing loop includes a digital pre-distortion module, an orthogonal modulator, a power amplifier, an attenuator, and an orthogonal demodulator; The output end of the quadrature modulator of the predistortion loop is directly connected to the input end of the power amplifier, the output end of the power amplifier is connected to the attenuator, and the attenuator is directly connected to the quadrature demodulator. The present invention simplifies the entire pre-distortion circuit by adopting a joint estimator, solves the problems of complex circuit and high power consumption of the traditional civil aviation ground-air data link digital pre-distortion method, and does not need an additional observation circuit; adopts a joint estimator, joint estimation and compensation Distortion problems such as amplitude imbalance, phase imbalance and DC offset generated by the quadrature modulator and quadrature demodulator, and there is no possibility of converging to the local minimum in the final estimated coefficient theoretically, so as to avoid the unsatisfactory linearization effect of the power amplifier .

Description

technical field [0001] The invention relates to the field of civil aviation communications, in particular to a digital predistortion processing circuit and method applied to civil aviation ground-air data links. Background technique [0002] In order to alleviate the pressure of the increasing air traffic flow on the control and make the application of new concepts and technologies in civil aviation control more standard, the civil aviation ground-air data link was proposed, and its application is becoming more and more popular. Among them, the power amplifier linearization technology is a key technology in the civil aviation ground-air data link. [0003] Digital predistortion technology is often used in the linearization of power amplifiers because of its high stability, high precision, strong adaptability and suitability for broadband communications. The traditional civil aviation ground-air data link digital pre-distortion method usually adopts a secondary mixing struct...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the traditional digital pre-distortion method of the civil aviation ground-air data link using the secondary frequency mixing structure has complex circuit structure and high power consumption, which is very unfavorable for miniaturization. The empty data link digital pre-distortion method, although the power consumption is reduced, but in order to compensate the distortion of the quadrature modem, an additional observation circuit is required, so the circuit structure is also very complicated, which is also not conducive to miniaturization

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