Restarted LBFGS Algorithm for Power Amplifier Predistortion

Ji Long Bao; Ren Xiang Zhu; Hong Xing Yuan

doi:10.4028/www.scientific.net/AMM.336-338.1871

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 336-338Restarted LBFGS Algorithm for Power Amplifier...

Restarted LBFGS Algorithm for Power Amplifier Predistortion

Abstract:

For the linearization of power amplifiers, a digital pre-distorter is proposed to compensate nonlinear distortion in this paper. The pre-distorter is realized by Volterra series, and a restarted limited memory BFGS(LBFGS) algorithm is proposed for training the nonlinear pre-distorter. Training of Volterra series can be switched between gradient descend algorithm and quasi Newton algorithm by setting a switching condition, and LBFGS algorithm can be used for high dimensional iterative matrix of BFGS algorithm. These make the new algorithm much more stable with a fast convergence rate. The pre-distorter is used for OFDM power amplifiers and it high efficiency is proved by simulation results. Moreover, the convergence rate of the proposed algorithm is greatly faster than that of the gradient algorithm.

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Periodical:

Applied Mechanics and Materials (Volumes 336-338)

Pages:

1871-1876

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.336-338.1871

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Online since:

July 2013

Authors:

Ji Long Bao, Ren Xiang Zhu, Hong Xing Yuan

Keywords:

Digital Pre-Distortion, Orthogonal Frequency Division Multiplexing (OFDM), Power Amplifier, Quasi Newton Algorithm

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