Title :
An MMSE based calibration of LINC transmitter
Author :
Nagareda, Riichiro ; Fukawa, Kazuhko ; Suzuki, Hiroshi
Author_Institution :
Tokyo Inst. of Technol., Japan
fDate :
6/24/1905 12:00:00 AM
Abstract :
This paper proposes a new correction technique for the LInear amplification with Nonlinear Components (LINC) transmitters. The technique, which is based on the minimum mean squared error (MMSE) criterion, estimates the gain and phase imbalance between the two amplifier branches. With information on the estimation, the imbalance is compensated by controlling the amplitude and phase of the input signal that is fed into one of the two amplifiers. Computer simulations with the QPSK modulation demonstrate that this method can calibrate the balance and sufficiently suppress the out-of-band distortion spectra.
Keywords :
calibration; interference suppression; land mobile radio; least mean squares methods; phase control; quadrature phase shift keying; radio transmitters; radiofrequency amplifiers; radiofrequency interference; LINC transmitter; MMSE based calibration; QPSK; amplitude control; computer simulations; gain imbalance estimation; input signal; linear amplification with nonlinear components; minimum mean squared error; mobile radio communication systems; out-of-band distortion spectra suppression; phase control; phase imbalance estimation; Amplitude modulation; Calibration; Computer simulation; Ear; High power amplifiers; Land mobile radio; Paper technology; Phase estimation; Quadrature phase shift keying; Radio transmitters;
Conference_Titel :
Vehicular Technology Conference, 2002. VTC Spring 2002. IEEE 55th
Print_ISBN :
0-7803-7484-3
DOI :
10.1109/VTC.2002.1002560
