PAPR Reduction Method for Digital Predistortion Linearizer Compensating for Frequency Dependent IMD Components

Yasunori SUZUKI  Junya OHKAWARA  Shoichi NARAHASHI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E101-C   No.2   pp.118-125
Publication Date: 2018/02/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E101.C.118
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
peak-to-average power ratio (PAPR) reduction,  base station power amplifier (PA),  digital predistortion linearizer (DPDL),  drain efficiency,  

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Summary: 
This paper proposes a method for reducing the peak-to-average power ratio (PAPR) at the output signal of a digital predistortion linearizer (DPDL) that compensates for frequency dependent intermodulation distortion (IMD) components. The proposed method controls the amplitude and phase values of the frequency components corresponding to the transmission bandwidth of the output signal. A DPDL employing the proposed method simultaneously provides IMD component cancellation of out-of-band components and PAPR reduction at the output signal. This paper identifies the amplitude and phase conditions to minimize the PAPR. Experimental results based on a 2-GHz band 1-W class power amplifier show that the proposed method improves the drain efficiency of the power amplifier when degradation is allowed in the error vector magnitude. To the best knowledge of the authors, this is the first PAPR reduction method for DPDL that reduces the PAPR while simultaneously compensating for IMD components.