Title :
Design and Experimental Evaluation of a LINC Transmitter for OFDM Systems
Author :
García-Ducar, Paloma ; De Mingo, Jesus ; Carro, Pedro Luis ; Valdovinos, Antonio
Author_Institution :
Dept. of Electron. Eng. & Commun., Univ. of Zaragoza, Zaragoza, Spain
fDate :
10/1/2010 12:00:00 AM
Abstract :
The LInear amplification using Nonlinear Components (LINC) technique is a well-known power amplifier linearization method to reduce out-of-band interferences in a nonconstant envelope modulation system. Its major drawback is the inherent sensitivity to gain and phase imbalances between the two amplifier branches. In this paper a digital correction method, which corrects these gain and phase imbalances, is implemented and verified. Commercial analog devices and a digital platform for signal processing purposes are used. The experimental results applied in an OFDM transmitter show a linearity improvement close to 20 dB without reducing the output power and without increasing the in-band distortion.
Keywords :
OFDM modulation; amplification; transmitters; LINC transmitter; OFDM system; OFDM transmitter; commercial analog device; digital correction method; digital platform; gain imbalance; in-band distortion; linear amplification using nonlinear components; nonconstant envelope modulation system; out-of-band interference; phase imbalance; power amplifier linearization method; signal processing; Delay; Gain; Linearity; Modulation; OFDM; Transmitters; Wireless communication; Amplifier linearization; OFDM; linear amplification using nonlinear components (LINC);
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2010.090210.090949
