A special complex-valued simplicial canonical piecewise linear function for amplifier and predistorter nonlinearity representation

LETTER

Xiaowei Kong, Wei Xia, Zishu He, Hongshu Liao

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Keywords: simplicial canonical piecewise linear function (SCPWL), polynomial function, nonlinear modeling, normalized mean square error (NMSE)

JOURNAL FREE ACCESS

2011 Volume 8 Issue 19 Pages 1556-1561

DOI https://doi.org/10.1587/elex.8.1556

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Abstract

In this paper, a special complex-valued simplicial canonical piecewise linear (CSCPWL) function is presented for power amplifier and digital predistorter nonlinearity representation. The proposed function is derived from the simplicial canonical piecewise linear (SCPWL) function approximates to polynomial basis and can be easily applied for baseband modeling with complex-valued signal. Through the experiment simulation, the modeling capacity, algorithm complexity and numerical stability of the proposed function are discussed. Finally, the conclusion that the special CSCPWL function is a compromise between the system performance and hardware cost is given.

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