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    Optimum Design of Doherty RFPA for Mobile WiMAX Base Stations

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    final_doherty_portugal.pdf (548.7Kb)
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    Publication date
    06/09/2010
    Author
    Ghazaany, Tahereh S.
    Abd-Alhameed, Raed A.
    Child, Mark B.
    Ali, N.T.
    Rodriguez, Jonathan
    Hussaini, Abubakar S.
    Keyword
    Linearity
    Power amplifier
    OFDM
    Doherty techniques
    Mobile WiMAX
    Base stations
    Digital pre-distortion
    Rights
    © 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)
    Peer-Reviewed
    Yes
    
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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.
    URI
    http://hdl.handle.net/10454/4484
    Version
    Accepted Manuscript
    Citation
    Hussaini, A.S., Sadeghpour, T., Abd-Alhameed, R.A., Child, M.B., Ali, N.T. and Rodriguez, J.(2010). [Invited paper to the] 6th International ICST Conference on Mobile Multimedia Communications (MobiMedia 2010), EERT-3, Lisbon, Portugal 6-8 September 2010. ISBN: 978-963-9799-98-1. Paper No. 3, pp. 1-6.
    Type
    Conference paper
    Collections
    Engineering and Digital Technology Publications

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