NDLI: Piecewise Pre-Equalized Linearization of the Wireless Transmitter With a Doherty Amplifier

Content Provider	IEEE Xplore Digital Library
Author	Wan-Jong Kim Kyoung-Joon Cho Stapleton, S.P. Jong-Heon Kim
Copyright Year	1963
Abstract	This paper describes a predistorter (PD) based on piecewise pre-equalizers for use in multichannel wideband applications. The predistortion linearizer consists of piecewise pre-equalizers along with a look-up-table-based digital PD that together compensate for nonlinearities, as well as memory effects of power amplifiers (PAs). It takes advantage of multiple finite-impulse-response filters that significantly reduce the complexity when compared to memory polynomial methods. The proposed method was also compared with the conventional Hammerstein structure. A 300-W peak envelope power Doherty PA was first modeled by measured time-based samples in order to verify the adjacent channel power ratio (ACPR) performance in simulation using a multitone and single wideband code-division multiple-access (W-CDMA) carrier. Furthermore, the experimental results applying two W-CDMA carriers verify that the proposed method provided similar improvement to that of the memory polynomial approach. The experimental results verified the complexity reduction and superior ACPR performance over the conventional Hammerstein structure
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	3469
Ending Page	3478
Page Count	10
File Size	1032439
File Format	PDF
ISSN	00189480
Volume Number	54
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transmitters Linearity Predistortion Amplitude modulation Linearization techniques Broadband amplifiers Finite impulse response filter Polynomials Multiaccess communication Radio frequency memory polynomial Adjacent channel power ratio (ACPR) digital predistorter (PD) Doherty power amplifier (DPA) finite-impulse-response (FIR) filter Hammerstein lookup table (LUT) memory effects
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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