A Generalized Memory Polynomial Model for Digital Predistortion of RF Power Amplifiers

Conventional radio-frequency (RF) power amplifiers operating with wideband signals, such as wideband code-division multiple access (WCDMA) in the Universal Mobile Telecommunications System (UMTS) must be backed off considerably from their peak power level in order to control out-of-band spurious emi...

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Bibliographic Details
Published in:IEEE transactions on signal processing 2006-10, Vol.54 (10), p.3852-3860
Main Authors: Morgan, D.R., Zhengxiang Ma, Jaehyeong Kim, Zierdt, M.G., Pastalan, J.
Format: Article
Language:English
Subjects:
3G mobile communication
Amplifiers
Applied sciences
Broadband amplifiers
Circuit properties
Digital
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Equipments and installations
Exact sciences and technology
Mathematical models
Memory polynomial
Mobile radiocommunication systems
Multiaccess communication
Polynomials
Power amplifiers
Power system modeling
Predistortion
Radio frequencies
Radio frequency
Radiocommunications
Radiofrequency amplifiers
RF signals
Spectra
Spectral emissivity
spectral regrowth
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Telecommunications systems
Transmission and modulation (techniques and equipments)
Universal Mobile Telecommunications System (UMTS)
Wideband
wideband code-division multiple access (WCDMA)
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Description
Summary:Conventional radio-frequency (RF) power amplifiers operating with wideband signals, such as wideband code-division multiple access (WCDMA) in the Universal Mobile Telecommunications System (UMTS) must be backed off considerably from their peak power level in order to control out-of-band spurious emissions, also known as "spectral regrowth." Adapting these amplifiers to wideband operation therefore entails larger size and higher cost than would otherwise be required for the same power output. An alternative solution, which is gaining widespread popularity, is to employ digital baseband predistortion ahead of the amplifier to compensate for the nonlinearity effects, hence allowing it to run closer to its maximum output power while maintaining low spectral regrowth. Recent improvements to the technique have included memory effects in the predistortion model, which are essential as the bandwidth increases. In this paper, we relate the general Volterra representation to the classical Wiener, Hammerstein, Wiener-Hammerstein, and parallel Wiener structures, and go on to describe some state-of-the-art predistortion models based on memory polynomials. We then propose a new generalized memory polynomial that achieves the best performance to date, as demonstrated herein with experimental results obtained from a testbed using an actual 30-W, 2-GHz power amplifier
ISSN:1053-587X
1941-0476
DOI:10.1109/TSP.2006.879264