Predistorter Design for a Memory - less Nonlinear High Power Amplifier Using the pth - Order Inverse Method for OFDM Systems 


Vol. 31,  No. 2, pp. 191-199, Feb.  2006


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  Abstract

In this paper, we propose a method to implement a predistorter of the p-th order inverse filter structure to prevent signal distortion and spectral re-growth due to the high PAPR (peak-to-average ratio) of the OFDM signals and the non-linearity of high-power amplifiers. We model the memory-less non-linearity of the high-power amplifier with a polynomial model and utilize the inverse of the model, the p-th order inverse filter, for the predistorter. Once the non-linearity is modeled with a polynomial, since we can determine the p-th order inverse filter only with the coefficients of the polynomial, large memory is not required. To update the coefficients of the non-linear high-power amplifier model, we can use LMS or RLS algorithms. The convergence speed is high since the number of coefficients is small, and the computation is simple since manipulation of complex numbers is not necessary.

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  Cite this article

[IEEE Style]

S. Lim and C. Eun, "Predistorter Design for a Memory - less Nonlinear High Power Amplifier Using the pth - Order Inverse Method for OFDM Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 2, pp. 191-199, 2006. DOI: .

[ACM Style]

Sunmin Lim and Changsoo Eun. 2006. Predistorter Design for a Memory - less Nonlinear High Power Amplifier Using the pth - Order Inverse Method for OFDM Systems. The Journal of Korean Institute of Communications and Information Sciences, 31, 2, (2006), 191-199. DOI: .

[KICS Style]

Sunmin Lim and Changsoo Eun, "Predistorter Design for a Memory - less Nonlinear High Power Amplifier Using the pth - Order Inverse Method for OFDM Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 2, pp. 191-199, 2. 2006.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880