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

Document Type : Research Article

Authors

1 M.Sc. Student, Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran

2 Professor, Department of Electrical Engineering, Amirkabir University of technology, Tehran, Iran

3 Assistant 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

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