Pre-distorter Method Using LUT with 21 Partition Interpolation in the OFDM System 


Vol. 27,  No. 7, pp. 668-675, Jul.  2002


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  Abstract

This paper proposes pre-distorter combined LUT with 2?? partition interpolation method to reduce nonlinear distortion which was caused by high PAPR and to update LUT quickly. Pre-distorted gain and phase can be found by using LUT which consisted of AM/AM and AM/PM value, and OFDM signal amplitude. The proposed 2?? partition interpolation can accurately find predistorted gain and phase using bit shift and add component instead of increasing size of LUT which requires increasing the amount of computation.
The performance of the proposed method was measured by the difference between HPA input and output characteristics by the LUT size, constellation, SER performance by the HPA, and LUT update error by the HPA characteristic changes. As a result, it is shown that when the size of the LUT is 32 and 64 for l6-QAM and 64-QAM, nonlinear distortion nearly didn′t occurred.
This paper proposes pre-distorter combined LUT with 2?? partition interpolation method to reduce nonlinear distortion which was caused by high PAPR and to update LUT quickly. Pre-distorted gain and phase can be found by using LUT which consisted of AM/AM and AM/PM value, and OFDM signal amplitude. The proposed 2?? partition interpolation can accurately find predistorted gain and phase using bit shift and add component instead of increasing size of LUT which requires increasing the amount of computation.
The performance of the proposed method was measured by the difference between HPA input and output characteristics by the LUT size, constellation, SER performance by the HPA, and LUT update error by the HPA characteristic changes. As a result, it is shown that when the size of the LUT is 32 and 64 for l6-QAM and 64-QAM, nonlinear distortion nearly didn′t occurred.

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  Cite this article

[IEEE Style]

O. Kwon, H. Lee, Y. Ha, "Pre-distorter Method Using LUT with 21 Partition Interpolation in the OFDM System," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 7, pp. 668-675, 2002. DOI: .

[ACM Style]

Oh-Ju Kwon, Ho-Keun Lee, and Yeong-Ho Ha. 2002. Pre-distorter Method Using LUT with 21 Partition Interpolation in the OFDM System. The Journal of Korean Institute of Communications and Information Sciences, 27, 7, (2002), 668-675. DOI: .

[KICS Style]

Oh-Ju Kwon, Ho-Keun Lee, Yeong-Ho Ha, "Pre-distorter Method Using LUT with 21 Partition Interpolation in the OFDM System," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 7, pp. 668-675, 7. 2002.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880