Towards an analytical model of I/Q imbalance in OFDM based direct conversion receivers

Author

Rykaczewski, Piotr ; Brakensiek, Jorg ; Jondral, Friedrich K.

Author_Institution

Karlsruhe Univ., Germany

Volume

4

fYear

2004

fDate

17-19 May 2004

Firstpage

1831

Abstract

Architectural simplicity, the possibility of monolithic integration as well as the lack of image filter problems make homodyne receivers very popular. However, their I/Q architecture is sensitive to impairments. OFDM based systems are particularly likely to suffer from imbalances due to distortions introduced by the time-to-frequency transformation of the filtered signal in the case of a mismatch between the I and Q branches. The paper focuses on clarifying how phase and amplitude imbalances influence the baseband signal processing of an OFDM based homodyne receiver. A novel analytical impairments model is presented, discussed and compared with simulations of an IEEE 802.11a system.

Keywords

OFDM modulation; homodyne detection; radio receivers; signal processing; I/Q architecture; I/Q imbalance; IEEE 802.11a; OFDM; amplitude imbalances; baseband signal processing; direct conversion receivers; filtered signal; homodyne receivers; image filter problems; monolithic integration; phase imbalances; time-to-frequency transformation; Amplitude modulation; Analytical models; Baseband; Distortion; Filters; Focusing; Image converters; Local oscillators; Monolithic integrated circuits; OFDM;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th

ISSN

1550-2252

Print_ISBN

0-7803-8255-2

Type

conf

DOI

10.1109/VETECS.2004.1390589

Filename

1390589