Performance Evaluation of Peak-to-Average Power Ratio Reduction and Digital Pre-Distortion for OFDM Based Systems

In this paper, we evaluate the effect of applying peak-to-average power ratio (PAPR) reduction and digital pre-distortion (DPD) on two types of radio frequency power amplifiers when an orthogonal frequency division multiplexing (OFDM) signal is used. The power amplifiers under test are a standard cl...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2011-12, Vol.59 (12), p.3504-3511
Main Authors: Nader, C., Landin, P. N., Van Moer, W., Bjorsell, N., Handel, P.
Format: Article
Language:English
Subjects:
Amplifiers
Bandwidth
Clipping and filtering
Digital
digital pre-distortion
Digital predistortion
Doherty power amplifiers
Filtering
Mathematical models
OFDM
Orthogonal Frequency Division Multiplexing
Peak to average power ratio
peak-to-average power reduction
Performance evaluation
power amplifier
Power amplifiers
Radio frequency
Reduction
Wireless LAN
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Summary:In this paper, we evaluate the effect of applying peak-to-average power ratio (PAPR) reduction and digital pre-distortion (DPD) on two types of radio frequency power amplifiers when an orthogonal frequency division multiplexing (OFDM) signal is used. The power amplifiers under test are a standard class-AB amplifier and a Doherty amplifier. The PAPR reduction methods are based on a state-of-the art convex optimization formulation and on the standard clipping and filtering technique. The DPD method consists of modeling the behavior of the power amplifier using a parallel Hammerstein model, and then extracting the inverse parameters based on the indirect learning architecture. To achieve better DPD performance, extracting the DPD parameters based on multiple-step iterations is investigated. The cases where PAPR reduction and DPD are applied separately and combined are studied and investigated. Power amplifier figures of merit are evaluated. Good performance is shown when combining both pre-processing techniques up to a certain operating point where DPD performance deteriorates due to generation of strong peaks in the signal. In addition, a difference in the power amplifier behavior is reported and analyzed.
ISSN:0018-9480
1557-9670
1557-9670
DOI:10.1109/TMTT.2011.2170583