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A Convergence-Free Predistortion Technique for Adaptive Linearisation of RF Power Amplifiers

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Abstract

Adaptive digital baseband predistortion is a well-known linearisation technique for removing intermodulation products that radio frequency power amplifiers (PAs) introduce. This paper proposes a new baseband predistortion method that is based on a non-iterative, fast adaptation algorithm without convergence restrictions. The response of the PA in a batch of training magnitude stimuli is used for the computation of the predistortion gain. The latter is directly extracted in rectangular form without prior transformations and AM/AM and AM/PM non-linearities sequential estimation. The influence of the gain table size and the imperfections of the modulator and demodulator in the method's performance are examined. Experimental measurements of an in-house prototype show a linearity improvement of about 25 dB.

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Authors and Affiliations

  1. Microelectronic Circuit Design Group, National Technical University of Athens, Greece

    Nikos Naskas & Yannis Papananos

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  1. Nikos Naskas
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  2. Yannis Papananos
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Naskas, N., Papananos, Y. A Convergence-Free Predistortion Technique for Adaptive Linearisation of RF Power Amplifiers. Analog Integrated Circuits and Signal Processing 41, 109–118 (2004). https://doi.org/10.1023/B:ALOG.0000041628.85966.ef

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  • DOI: https://doi.org/10.1023/B:ALOG.0000041628.85966.ef

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