IIIE 20352
INSTITUTO DE INVESTIGACIONES EN INGENIERIA ELECTRICA "ALFREDO DESAGES"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Compensation of IQ imbalance and transmitter nonlinearities in broadband MIMO-OFDM
Autor/es:
F. GREGORIO; J. E. COUSSEAU; S. WERNER; T. RIIHONEN; R.WICHMAN
Lugar:
Rio de Janeiro
Reunión:
Conferencia; International Symposium on Circuits and Systems; 2011
Institución organizadora:
IEEE
Resumen:
Predistortion techniques are implemented in OFDM systems to improve power amplifier efficiency while keeping in-band and out of band distortion at acceptable levels. Predistorter (PD) design for broadband MIMO-OFDM systems introduces several implementationchallenges. Coupling effects cannot be avoided in MIMO transceivers where the paths are implemented on the same chipset. Moreover, baseband PDs are affected by imbalances in the IQ modulator. This paper proposes a MIMO-PD that linearizes the power amplifier (PA) response and compensates for both crosstalk and IQ imbalance. Error vectormagnitude (EVM) and adjacent channel power ratio (ACPR) results show a significant improvement compared with conventional PD systems.
