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Optimum Design of Doherty RFPA for Mobile WiMAX Base Stations
Ghazaany, Tahereh S. Child, Mark B. Ali, N.T. Rodriguez, Jonathan Hussaini, Abubakar S.
Ghazaany, Tahereh S.
Child, Mark B.
Ali, N.T.
Rodriguez, Jonathan
Hussaini, Abubakar S.
Publication Date
06/09/2010
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© 2010 Springer. Reproduced in accordance with the publisher's self-archiving policy. Original publication will be available at http://www.springerlink.com (Springer Lecture Notes of ICST)
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Abstract
RF power amplifiers in mobile WiMAX transceivers operate in an inherently nonlinear manner. It is possible to amplify the signal in the linear region, and avoid distortion, using output power back-off; however, this approach may suffer significant reduction in efficiency and power output. This paper investigates the use of Doherty techniques instead of back-off, to simultaneously achieve good efficiency and acceptable linearity. A 3.5 GHz Doherty RFPA has been designed and optimized using a large signal model simulation of the active device, and performance analysis under different drive levels. However, the Doherty EVM is generally poor for mobile WiMAX. Linearity may be improved by further digital pre-distortion, and a simple pre-distortion method using forward and reverse AM-AM and AM-PM modeling. Measurements on the realized amplifier show that this approach satisfies the EVM requirements for WiMAX base stations. It exhibits a PAE over 60%, and increases the maximum linear output power to 43 dBm, whilst improving the EVM.
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Accepted manuscript
Citation
Hussaini AS, Sadeghpour T, Abd-Alhameed R et al (2010) [Invited paper to the] 6th International ICST Conference on Mobile Multimedia Communications (MobiMedia 2010), EERT-3, Lisbon, Portugal 6-8 September 2010. Paper No. 3. Pp. 1-6.
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Conference paper