A phase compensation method and system for improving linearity

Abstract

The invention discloses a phase compensation method and system for improving linearity, including a communication transmitter system. The method includes: performing initial phase segmental trimming on each unit of the communication transmitter system; Power phase fine-tuning until the output phase difference of each feed speaker is within the maximum phase difference range tolerated by the communication transmitter system; and fine-tuning verification of the high-power phase fine-tuning results. The invention adopts segmented phase matching, which has fast phase matching speed and high consistency; the invention can greatly improve the linearity accuracy of the power amplifier through the combination of the power amplifier pre-distortion correction technology and the phase shifting technology, so that the 24-channel power amplifier and waveguide can be precisely phased , so that the system installation and debugging operations are more convenient; the system equipment or components involved in the present invention can be replaced separately after failure, and after the replacement, only the replacement equipment or components need to be matched and debugged separately, the fault isolation is simple, and the equipment cost is reduced. Maintenance costs.

Description

technical field [0001] The invention relates to the technical field of power amplifier phase compensation, in particular to a phase compensation method and system for improving linearity. Background technique [0002] Microwave power amplifiers are usually used to amplify the transmission signal power to the power level required for transmission to ensure a certain range of signal coverage. Generally, it is at the final stage of the communication system transmitter and is one of the most nonlinear devices in the communication system. , seriously affecting the quality of the communication signal. When the linear modulation signal with a non-constant envelope passes through the nonlinear power amplifier, intermodulation distortion will be generated, resulting in spectrum expansion, and it cannot be filtered out with a filter. The distortion falling within the channel band will increase the signal bit error rate, and the regenerated spectrum outside the band will cause interfe...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that for linear modulation systems, the existing linearized phase compensation methods often have low precision, low efficiency, high system cost, and high maintenance cost. The present invention provides a solution to the above problems. The phase compensation method and system for improving linearity, in order to reduce the nonlinearity of the system and improve the efficiency of the power amplifier, according to the structural characteristics of the airborne system, follow the principle of equal length and phase of 24 waveguides, and adopt the Ku-band 750W traveling wave tube power amplifier pre-amplifier Distortion correction and linearization technology, waveguide phase matching technology, and phase compensation of the power amplifier with phase shifting network, so as to improve the linearity of the power amplifier and balance the phase of the power amplifier

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