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Prediction of Nonlinear Distortion in Wideband Active Antenna Arrays

Katharina Hausmair (Institutionen för signaler och system, Kommunikationssystem) ; Sebastian Gustafsson (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Cesar Sánchez-Pérez (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Per N. Landin ; Ulf Gustavsson ; Thomas Eriksson (Institutionen för signaler och system, Kommunikationssystem ; Institutionen för elektroteknik, Kommunikationssystem) ; Christian Fager (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik)
IEEE Transactions on Microwave Theory and Techniques (0018-9480). Vol. 65 (2017), 11, p. 4550-4563.
[Artikel, refereegranskad vetenskaplig]

In this paper we propose a technique for comprehensive analysis of nonlinear and dynamic characteristics of multi-antenna transmitters (TXs). The analysis technique is enabled by the development of a Volterra series-based dual-input model for power amplifiers (PAs), which is capable of taking into account the joint effects of PA nonlinearity, antenna crosstalk and mismatch for wideband modulated signals. By combining multiple instances of the PA model with linear dynamic antenna simulations we develop the analysis technique. The proposed method allows the prediction of the output signal of every antenna in an arbitrarily sized TX array, as well as the total far-field radiated wave of the TX for any input signal with low computational effort. A 2.12 GHz four-element TX demonstrator based on GaAs PAs is implemented to verify simulation results with measurements. The proposed technique is a powerful tool to study hardware characteristics, as for example the effects of antenna design and element spacing. It can be used in cases where experiments are not feasible, and thus aid the development of next generation wireless systems.

Nyckelord: active antenna array, antenna crosstalk, MIMO, mismatch, multi-antenna transmitter, power amplifier modeling



Denna post skapades 2017-11-03. Senast ändrad 2017-12-05.
CPL Pubid: 252917

 

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