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Saleh Model and Digital Predistortion for Power Amplifiers in Wireless Communications Using the Third-Order Intercept Point

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Abstract

This paper presents a novel approach for estimating the Saleh model’s parameters using the gain and third-order intercept point (IP3) of a power amplifier. The IP3 is a widely used technical parameter for describing the nonlinearity of the power amplifier in wireless communications. The proposed approach minimizes an objective function of error between the third-order Taylor series and the Saleh Amplitude-to-Amplitude (AM/AM) model. This approach of the parameters estimation is also used for identifying the Digital Predistortion (DPD) to compensate for the memoryless AM/AM nonlinear distortion of power amplifiers in wireless communications. Finally, the Saleh model accuracy and DPD linearization are validated based on the WCDMA measurement signal.

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Acknowledgments

The authors would like to acknowledge Dr. J. Veerman from the Math department, and Chenyang Li from the electrical and computer engineering department at Portland State University for their insight suggestions in the equations’ derivation.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, Portland State University, Portland, OR, 97207-0751, USA

    Haider Al-kanan, Xianzhen Yang & Fu Li

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  1. Haider Al-kanan
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  2. Xianzhen Yang
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  3. Fu Li
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Correspondence to Haider Al-kanan.

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Responsible Editor: S. Mir

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Al-kanan, H., Yang, X. & Li, F. Saleh Model and Digital Predistortion for Power Amplifiers in Wireless Communications Using the Third-Order Intercept Point. J Electron Test 35, 359–365 (2019). https://doi.org/10.1007/s10836-019-05801-3

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  • DOI: https://doi.org/10.1007/s10836-019-05801-3

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