INVESTIGADORES
GREGORIO Fernando Hugo
congresos y reuniones científicas
Título:
Compensation of IQ Imbalance and Transmitter Nonlinearities in Broadband MIMO-OFDM
Autor/es:
FERNANDO GREGORIO; JUAN COUSSEAU; STEFAN WERNER; RISTO WICHMAN; TANELLI RIHONEN
Lugar:
Rio de Janeiro
Reunión:
Conferencia; IEEE International Symposium on Circuits and Systems, ISCAS 2011; 2011
Institución organizadora:
LPS - Universidad Federal de Rio de Janeiro
Resumen:
Predistortion techniques are implemented in OFDM systemsto improve power amplifier efficiency while keeping in-band and outof-band distortion at acceptable levels. Predistorter (PD) design forbroadband MIMO-OFDM systems introduces several implementationchallenges. Coupling effects cannot be avoided in MIMO transceiverswhere the paths are implemented on the same chipset. Moreover,baseband PDs are affected by imbalances in the IQ modulator. This paperproposes a MIMO-PD that linearizes the power amplifier (PA) responseand compensates for both crosstalk and IQ imbalance. Error vectormagnitude (EVM) and adjacent channel power ratio (ACPR) results showa significant improvement compared with conventional PD systems.
