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Ebrahimi Ghiri, R., Mohammadi, A., Abdipour, A., Mirzavand, R. (2015). Power Amplifier Linearization Using Six-port Receiver for DVB-S2 Satellite Communications. AUT Journal of Electrical Engineering, 45(1), 51-58. doi: 10.22060/eej.2015.484
R. Ebrahimi Ghiri; A. Mohammadi; A. Abdipour; R. Mirzavand. "Power Amplifier Linearization Using Six-port Receiver for DVB-S2 Satellite Communications". AUT Journal of Electrical Engineering, 45, 1, 2015, 51-58. doi: 10.22060/eej.2015.484
Ebrahimi Ghiri, R., Mohammadi, A., Abdipour, A., Mirzavand, R. (2015). 'Power Amplifier Linearization Using Six-port Receiver for DVB-S2 Satellite Communications', AUT Journal of Electrical Engineering, 45(1), pp. 51-58. doi: 10.22060/eej.2015.484
Ebrahimi Ghiri, R., Mohammadi, A., Abdipour, A., Mirzavand, R. Power Amplifier Linearization Using Six-port Receiver for DVB-S2 Satellite Communications. AUT Journal of Electrical Engineering, 2015; 45(1): 51-58. doi: 10.22060/eej.2015.484

Power Amplifier Linearization Using Six-port Receiver for DVB-S2 Satellite Communications

Article 6, Volume 45, Issue 1, Winter and Spring 2013, Page 51-58  XML PDF (656 K)
Document Type: Research Article
DOI: 10.22060/eej.2015.484
Authors
R. Ebrahimi Ghiri1; A. Mohammadi* 2; A. Abdipour2; R. Mirzavand3
1M.Sc. Student, Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran
2Professor, Department of Electrical Engineering, Amirkabir University of technology, Tehran, Iran
3Assistant Professor, Department of Electrical Engineering, Amirkabir University of technology, Tehran, Iran
Abstract
A digital look-up table adaptive predistortion technique using a six-port receiver for power amplifier linearization is
presented. The system is designed in Ka-band for a DVB-S2 satellite link. We use a six-port receiver at the linearization
loop in place of classic heterodyne receivers. The six-port receiver is implemented by the use of passive microwave
circuits and detector diodes. This approach highly reduces cost and complexity of the linearization system. The
fabrication results of a five-port receiver operating in 23–29 GHz is presented in this paper. The simulation results
confirm suitability of using this architecture in the power amplifier linearization loop. The third order intermodulation
products and the fifth order intermodulation products reduce about 43 dB and 25 dB respectively, after linearization of
the power amplifier. The resulting spectrum of the output signal shows significant reduction of the intra-system
interference to the adjacent networks which is mainly due to the nonlinearity effects of the power amplifier.
Keywords
Ka-band; Digital Predistortion; Linearization; Six-port; Five-port
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