I/Q imbalance mitigation for STBC MIMO-OFDM communication systems

Author

Cao, Mingzheng ; Ge, Hongya

Author_Institution

Dept. of ECE, New Jersey Inst. of Technol., Newark, NJ

fYear

2008

fDate

March 31 2008-April 4 2008

Firstpage

3093

Lastpage

3096

Abstract

In this work we study the performance degradation caused by the in-phase/quadrature (I/Q) imbalance in space-time block coded (STBC) multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) communication systems. The 2-Tx Alamouti scheme, 4-Tx quasi- orthogonal STBC (QOSTBC) scheme, and 4-Tx rotated QOSTBC (RQOSTBC) scheme with I/Q imbalance are examined in details. Our study shows that I/Q imbalance causes severe distortion in STBC MIMO-OFDM systems. By exploiting the structure of the received signal, low-complexity solutions are developed to mitigate the resultant distortion successfully.

Keywords

MIMO communication; OFDM modulation; block codes; modulation coding; orthogonal codes; space-time codes; transceivers; 2-Tx Alamouti scheme; 4-Tx quasiorthogonal STBC scheme; 4-Tx rotated QOSTBC scheme; QOSTBC scheme; RQOSTBC scheme; STBC MIMO-OFDM communication systems; in-phase imbalance; multiple-input multiple-output systems; orthogonal frequency division multiplexing; performance degradation; quadrature imbalance; space-time block code; transceiver I/Q imbalance mitigation; Baseband; Fading; MIMO; Maximum likelihood decoding; OFDM; Signal processing; Space technology; Transceivers; Transmitting antennas; Wireless communication; I/Q imbalance; MIMO; OFDM; STBC;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech and Signal Processing, 2008. ICASSP 2008. IEEE International Conference on

Conference_Location

Las Vegas, NV

ISSN

1520-6149

Print_ISBN

978-1-4244-1483-3

Electronic_ISBN

1520-6149

Type

conf

DOI

10.1109/ICASSP.2008.4518304

Filename

4518304