Title :
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
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;
Conference_Titel :
Radio Frequency Integrated Circuits Symposium, 2009. RFIC 2009. IEEE
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-3377-3
Electronic_ISBN :
1529-2517
DOI :
10.1109/RFIC.2009.5135568
