NDLI: A Combined Approach to Digital Predistortion and Crest Factor Reduction for the Linearization of an RF Power Amplifier

Content Provider	IEEE Xplore Digital Library
Author	Braithwaite, R.N.
Copyright Year	1963
Abstract	A combined approach to digital predistortion (DPD) and crest factor reduction (CFR) is proposed. The new CFR is structured similar to DPD and is implemented by introducing a steady-state offset into the DPD coefficients. The DPD and CFR coefficients are estimated using separate adaptive processes but applied to the transmission path in a common module. The DPD/CFR module provides the means to exploit margins in the transmitter performance, allowing the tradeoff between peak-to-average-power ratio (PAPR), error vector magnitude, and adjacent channel power ratio (ACPR). The proposed approach applies CFR to the predistorted signal instead of the input signal. This allows the envelope clipping module, which is typically present to protect the power amplifier (PA), to be removed, thereby avoiding divergence problems during the iterative closed-loop estimation of the DPD coefficients. Results show that post-CFR lowers the PAPR of the predistorted signal by 5 dB, which reduces the stress on the peaking transistor in a Doherty PA. The combined DPD/CFR reduces the ACPR of the transmitter by 21 dB compared with the unlinearized PA.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	291
Ending Page	302
Page Count	12
File Size	2480048
File Format	PDF
ISSN	00189480
Volume Number	61
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Peak to average power ratio Estimation Distortion measurement Radio frequency Polynomials Vectors Kernel power amplifiers (PAs) Amplifier distortion communication system nonlinearities power amplifier linearization
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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