Comparison of direct learning and indirect learning predistortion architechtures

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Power amplifiers in a communication system are inherently nonlinear. Digital predistorters can compensate these nonlinearity effects. In this paper, two memory polynomial predistorters including direct and indirect learning architectures are compared with each other. To the best of our knowledge, no similar comparisons have been published. Both of these architectures are special cases of the self-tuning control. We have modeled predistorters and analysed nonlinear effects of a power amplifier and their digital compensation by using Matlab. Simulation results show that the memory polynomial model has convergence problems at large amplitudes and also problems of accuracy of representation. We observed that the results of the compensation depend also on the amplitude, not only on the frequency. The results of the linearisation show that the direct learning architecture achieves a better performance in almost all cases.
Original languageEnglish
Title of host publication2008 IEEE International Symposium on Wireless Communication Systems
PublisherInstitute of Electrical and Electronic Engineers IEEE
Pages309-313
ISBN (Electronic)978-1-4244-2489-4
ISBN (Print)978-1-4244-2488-7
Publication statusPublished - 30 Dec 2008
MoE publication typeA4 Article in a conference publication

Fingerprint

Power amplifiers
Data storage equipment
Linearization
Communication systems
Tuning
Polynomials
Compensation and Redress
Statistical Models

Keywords

  • predistortion
  • power amplifier
  • constellation diagram
  • polynomials
  • nonlinear distortion
  • quadrature amplitude modulation

Cite this

Paaso, H., & Mämmelä, A. (2008). Comparison of direct learning and indirect learning predistortion architechtures. In 2008 IEEE International Symposium on Wireless Communication Systems (pp. 309-313). Institute of Electrical and Electronic Engineers IEEE.
Paaso, Henna ; Mämmelä, Aarne. / Comparison of direct learning and indirect learning predistortion architechtures. 2008 IEEE International Symposium on Wireless Communication Systems. Institute of Electrical and Electronic Engineers IEEE, 2008. pp. 309-313
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Paaso, H & Mämmelä, A 2008, Comparison of direct learning and indirect learning predistortion architechtures. in 2008 IEEE International Symposium on Wireless Communication Systems. Institute of Electrical and Electronic Engineers IEEE, pp. 309-313.

Comparison of direct learning and indirect learning predistortion architechtures. / Paaso, Henna; Mämmelä, Aarne.

2008 IEEE International Symposium on Wireless Communication Systems. Institute of Electrical and Electronic Engineers IEEE, 2008. p. 309-313.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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Paaso H, Mämmelä A. Comparison of direct learning and indirect learning predistortion architechtures. In 2008 IEEE International Symposium on Wireless Communication Systems. Institute of Electrical and Electronic Engineers IEEE. 2008. p. 309-313