Browse > Article
http://dx.doi.org/10.5515/KJKIEES.2008.19.11.1254

Modeling and Digital Predistortion Design of RF Power Amplifier Using Extended Memory Polynomial  

Lee, Young-Sup (Department of Electronic Engineering, Konkuk University)
Ku, Hyun-Chul (Department of Electronic Engineering, Konkuk University)
Kim, Jeong-Hwi (Infra Laboratory, KT)
Ryoo, Kyoo-Tae (Infra Laboratory, KT)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.19, no.11, 2008 , pp. 1254-1264 More about this Journal
Abstract
This paper suggests an extended memory polynomial model that improves accuracy in modeling memory effects of RF power amplifiers(PAs), and verifies effectiveness of the suggested method. The extended memory polynomial model includes cross-terms that are products of input terms that have different delay values to improve the limited accuracy of basic memory polynomial model that includes the diagonal terms of Volterra kernels. The complexity of the memoryless model, memory polynomial model, and the suggested model are compared. The extended memory polynomial model is represented with a matrix equation, and the Volterra kernels are extracted using least square method. In addition, the structure of digital predistorter and digital signal processing(DSP) algorithm based on the suggested model and indirect learning method are proposed to implement a digital predistortion linearization. To verify the suggested model, the predicted output of the model is compared with the measured output for a 10W GaN HEMT RF PA and 30 W LDMOS RF PA using 2.3 GHz WiBro input signal, and adjacent-channel power ratio(ACPR) performance with the proposed digital predistortion is measured. The proposed model increases model accuracy for the PAs, and improves the linearization performance by reducing ACPR.
Keywords
Adjacent Channel Power Ratio; Digital Predistortion; Memory Effects; Memory Polynomial; Nonlinear Model; Power Amplifier; WiBro;
Citations & Related Records
연도 인용수 순위
  • Reference
1 J. Kim, K. Konstantinou, "Digital predistortion of wideband signals based on power amplifier model with memory", Electron. Let., vol. 37, pp. 1417-1418, Nov. 2001   DOI   ScienceOn
2 L. Ding, G. T. Zhou, D. R. Morgan, Z. Ma, J. S. Kenney, J. Kim, and C. R. Giardina, "A robust digital baseband predistorter constructed using memory polynomial", IEEE Trans. Commun., vol. 52, no. 1 pp. 159-165, Jan. 2004   DOI   ScienceOn
3 S. G Glisic, Advanced Wireless Communications, 4G Technologies, Wiley, 2004
4 D. R Morgan, Z. Ma, J. Kim, M. G. Zierdt, and J. Pastalan, "A generalized memory polynomial model for digital predistortion of RF power amplifiers", IEEE Trans. Signals Process., vol. 54, no. 10. pp. 3852-3860, Oct. 2006   DOI   ScienceOn
5 A. Zhu, "Behavioral modeling of RF power amplifiers based on pruned Voterra series", IEEE Microw. Wireless Compon. Lett., vol. 14, pp. 563-565, Dec. 2004   DOI   ScienceOn
6 P. B. Kenington, "Linearized transmitters: an enabling technology for software defined radio", IEEE Comm. Magazine, vol. 40, no. 2, pp. 156-162, Feb. 2002
7 C. Eun, E. J. Powers, "A new Volterra predistorter based on the indirect learning architecture", IEEE Trans. Signals Process., vol. 45, no. 1. pp. 223-227, Jan. 1997   DOI   ScienceOn