9th International Conference on Cognitive Radio Oriented Wireless Networks

Research Article

Low-Complexity Digital Predistortion for Reducing Power Amplifier Spurious Emissions in Spectrally-Agile Flexible Radio

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  • @INPROCEEDINGS{10.4108/icst.crowncom.2014.255387,
        author={Mahmoud Abdelaziz and Lauri Anttila and Joseph Cavallaro and Shuvra Bhattacharyya and Abbas Mohammadi and Fadhel Ghannouchi and Markku Juntti and Mikko Valkama},
        title={Low-Complexity Digital Predistortion for Reducing Power Amplifier Spurious Emissions in Spectrally-Agile Flexible Radio},
        proceedings={9th International Conference on Cognitive Radio Oriented Wireless Networks},
        publisher={IEEE},
        proceedings_a={CROWNCOM},
        year={2014},
        month={7},
        keywords={carrier aggregation cognitive radio digital predistortion flexible spectrum access intermodulation lteadvanced mobile transmitter power amplifier},
        doi={10.4108/icst.crowncom.2014.255387}
    }
    
  • Mahmoud Abdelaziz
    Lauri Anttila
    Joseph Cavallaro
    Shuvra Bhattacharyya
    Abbas Mohammadi
    Fadhel Ghannouchi
    Markku Juntti
    Mikko Valkama
    Year: 2014
    Low-Complexity Digital Predistortion for Reducing Power Amplifier Spurious Emissions in Spectrally-Agile Flexible Radio
    CROWNCOM
    IEEE
    DOI: 10.4108/icst.crowncom.2014.255387
Mahmoud Abdelaziz1, Lauri Anttila1,*, Joseph Cavallaro2, Shuvra Bhattacharyya3, Abbas Mohammadi4, Fadhel Ghannouchi5, Markku Juntti6, Mikko Valkama1
  • 1: Tampere University of Technology
  • 2: Rice University
  • 3: University of Maryland
  • 4: Amirkabir University of Technology
  • 5: University of Calgary
  • 6: University of Oulu
*Contact email: lauri.anttila@tut.fi

Abstract

Increasing the flexibility in spectrum access is a key to enhanced efficiency in radio spectrum utilization. Non-contiguous carrier aggregation (CA) is one enabling technology towards more flexible spectrum access, but can also lead to serious implementation challenges in terms of transmitter linearity. Especially when a single power amplifier (PA) is deployed for all carriers, serious intermodulation components will rise which can easily limit the maximum transmit power. In this paper, a low-complexity digital predistortion (DPD) solution is developed to reduce the most critical spurious components at the PA output, opposed to more classical full bandwidth linearization. The developed concept and associated parameter learning and optimization are particularly tailored towards mobile devices, building on limited narrowband feedback receiver with reduced instrumentation complexity and reduced-rate DPD processing. The developed DPD solution can handle PAs with substantial memory effects, and is verified with extensive simulation examples in various non-contiguous carrier aggregation scenarios and practical PA models with memory.