Background estimation of power amplifier nonlinearities for OFDM signals

Author

Kolinko, P.V. ; Larson, L.E.

Author_Institution

Univ. of California San Diego, La Jolla, CA, USA

fYear

2009

fDate

7-9 June 2009

Firstpage

405

Lastpage

408

Abstract

A method of estimating the third-order distortion coefficient of a memoryless amplifier is presented for the case of an OFDM signal. The estimate is obtained from correlation of the existing PRBS sequences BPSK modulated onto the OFDM pilots with in-band pilot distortion products at the amplifier output. The estimate was used for digital pre-distortion of the amplifier, with 8-10 dB measured improvement in the adjacent channel power ratio (ACPR). The method can be used for real-time estimation of nonlinearities without unduly affecting the communication link.

Keywords

OFDM modulation; nonlinear distortion; nonlinear estimation; phase shift keying; power amplifiers; OFDM signal; adjacent channel power ratio; digital predistortion; in-band pilot distortion; memoryless amplifier; power amplifier nonlinearities; real-time estimation; sequences BPSK modulation; third-order distortion coefficient estimation; Binary phase shift keying; Distortion measurement; Nonlinear distortion; OFDM modulation; Power amplifiers; Power measurement; RF signals; Radio frequency; Radiofrequency amplifiers; Transfer functions; Communication system nonlinearities; OFDM; correlation; intermodulation distortion; nonlinear circuits; nonlinear distortion; nonlinear estimation; nonlinear systems; power amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Frequency Integrated Circuits Symposium, 2009. RFIC 2009. IEEE

Conference_Location

Boston, MA

ISSN

1529-2517

Print_ISBN

978-1-4244-3377-3

Electronic_ISBN

1529-2517

Type

conf

DOI

10.1109/RFIC.2009.5135568

Filename

5135568