Summary
International Conference on Emerging Technologies for Communications
2022
Session Number:S12
Session:
Number:S12-3
Digital Predistortion for THz RF Power Amplifier with 16-APSK Modulation in Non-Terrestrial-Networks
San Hlaing Myint, Kazuhiko Tamesue, Kunihisa Jitsuno, Toshio Sato, Takuro Sato, Tetsuya Kawanishi,
pp.-
Publication Date:2022/11/29
Online ISSN:2188-5079
Summary:
The ultra-high-speed feeder link system in Non-Terrestrial Network (NTN) being considered as a critical challenge for Beyond 5G. In this paper, firstly the transmission path is developed for feeder link systems that connect NTN to the ground. Gray coded 16-ary Amplitude-Phase-Shift keying (16-APSKgc3) modulation scheme is proposed for a triple-multiplier power amplifier (TMPA). The nonlinearity impact and characteristics of radio frequency (RF) power amplifiers are explored in high frequency the terahertz (THz) band (100 GHz band). The proposed model digital predistortion (DPD) methodology based on a TMPA model for compensation of the nonlinear distortion. The DPD coefficients of the power amplifier model have been extracted based on the nonlinear characteristics of amplifier and those of DPD have been identified by applying an indirect learning structure. Finally, the performance evaluation of proposed transmission model has been conducted by constellation of compensated signals and error vector magnitude (EVM) simulation.