Title :
Compensation of I/Q impairments and nonlinear distortion in MIMO wireless transmitters
Author :
Saffar, D. ; Boulejfen, Noureddine ; Ghannouchi, F. ; Helaoui, M. Mohamed ; Gharssalah, A.
Author_Institution :
Phys. Dept., Fac. des Sci. de Tunis, El-Manar, Tunisia
Abstract :
In this paper, a joint predistorter based on the multi-variable memory polynomial (MP) model is proposed to compensate for the modulator in-phase/quadrature (I/Q) imbalance, the power amplifier (PA) nonlinearity and the crosstalk induced by the interference between the different paths in MIMO radio systems simultaneously. The proposed algorithm was experimentally validated and compared to the crossover predistorter and its performance was evaluated for 2×2 MIMO transmitter with -30 dB nonlinear crosstalk and for unbalanced modulator. The proposed predistorter shows an improvement around 25 dBc over the uncompensated output.
Keywords :
MIMO communication; crosstalk; power amplifiers; radio transmitters; I-Q impairments; MIMO wireless transmitters; MP model; PA nonlinearity; crossover predistorter; crosstalk; joint predistorter; modulator in-phase-quadrature imbalance; multiple input multiple output radio systems; multivariable memory polynomial model; nonlinear crosstalk; nonlinear distortion; power amplifier nonlinearity; unbalanced modulator; Crosstalk; MIMO; Modulation; Polynomials; Power amplifiers; Radio frequency; Transmitters; I/Q imbalance; MIMO; RF crosstalk; digital predistortion; modulator; power amplifier;
Conference_Titel :
New Circuits and Systems Conference (NEWCAS), 2013 IEEE 11th International
Conference_Location :
Paris
Print_ISBN :
978-1-4799-0618-5
DOI :
10.1109/NEWCAS.2013.6573627
