A robust digital baseband predistorter constructed using memory polynomials

Power amplifiers (PAs) are inherently nonlinear devices and are used in virtually all communications systems. Digital baseband predistortion is a highly cost-effective way to linearize PAs, but most existing architectures assume that the PA has a memoryless nonlinearity. For wider bandwidth applicat...

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Published in:IEEE transactions on communications 2004-01, Vol.52 (1), p.159-165
Main Authors: Lei Ding, Zhou, G.T., Morgan, D.R., Zhengxiang Ma, Kenney, J.S., Jaehyeong Kim, Giardina, C.R.
Format: Article
Language:English
Subjects:
Bandwidth
Baseband
Broadband amplifiers
Frequency division multiplexing
Multiaccess communication
Polynomials
Power amplifiers
Predistortion
Robustness
Wideband
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cited_by cdi_FETCH-LOGICAL-c435t-b7b8f1f950a718f24bb5ed57ad4cc65899bf472d53202ae5f5f35f7b5a03f4763
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container_end_page 165
container_issue 1
container_start_page 159
container_title IEEE transactions on communications
container_volume 52
creator Lei Ding
Zhou, G.T.
Morgan, D.R.
Zhengxiang Ma
Kenney, J.S.
Jaehyeong Kim
Giardina, C.R.
description Power amplifiers (PAs) are inherently nonlinear devices and are used in virtually all communications systems. Digital baseband predistortion is a highly cost-effective way to linearize PAs, but most existing architectures assume that the PA has a memoryless nonlinearity. For wider bandwidth applications such as wideband code-division multiple access (WCDMA) or wideband orthogonal frequency-division multiplexing (W-OFDM), PA memory effects can no longer be ignored, and memoryless predistortion has limited effectiveness. In this paper, instead of focusing on a particular PA model and building a corresponding predistorter, we focus directly on the predistorter structure. In particular, we propose a memory polynomial model for the predistorter and implement it using an indirect learning architecture. Linearization performance is demonstrated on a three-carrier WCDMA signal.
doi_str_mv 10.1109/TCOMM.2003.822188
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subjects Bandwidth
Baseband
Broadband amplifiers
Frequency division multiplexing
Multiaccess communication
Polynomials
Power amplifiers
Predistortion
Robustness
Wideband
title A robust digital baseband predistorter constructed using memory polynomials
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