Digital pre-distortion techniques for multibeam interactions on LEO satellites

doi:10.7523/j.ucas.2023.042

Abstract

Abstract: The convergence of broadband LEO satellite communication systems with 5G is the development trend of satellite communication. To meet the demand for high-speed data transmission, multibeam technology based on large-scale digital phased arrays is indispensable. The peak-to-average ratio problem of multibeam signals induces the non-linear distortion of onboard power amplifiers, while the non-linear distortion of power amplifiers leads to serious interference between multibeams. A digital pre-distortion structure for multibeam is proposed for low-orbit satellite communication systems using large-scale phased arrays. A pre-distortion model is developed to solve the problems of non-linearity, intermodulation distortion and multibeam interference. Through simulation experiments, it is found that the proposed structure is more advantageous than the traditional pre-distortion structure in terms of performance and complexity balance, providing a feasible solution for the implementation of multibeam and overcoming non-linearity on board.

Key words: digital pre-distortion, multibeam, LEO satellites, power amplifiers

CLC Number:

TN927

HUANG Chenguang, WANG Haiwang, SHAO Fengwei, LI Guotong. Digital pre-distortion techniques for multibeam interactions on LEO satellites[J]. Journal of University of Chinese Academy of Sciences, 2025, 42(4): 519-527.

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