Frequency-Dependent I/Q Imbalance Compensator for 2x2 MIMO-OFDM Systems

Author

Hsu, Terng-Yin ; Lai, Wei-Chi ; He, Tsung-Yeh

Author_Institution

Dept. of Comput. Sci., Nat. Chiao-Tung Univ., Hsinchu, Taiwan

fYear

2012

fDate

27-30 May 2012

Firstpage

1

Lastpage

4

Abstract

Radio frequency (RF) imperfections, such as DC offset, frequency offset and I/Q imbalance, are important issues in wireless broadband systems. In this paper, preamble-aided estimation and compensation of I/Q imbalance with filter mismatch are proposed to enhance signal quality and link reliability for 2×2 MIMO-OFDM systems. The proposed preamble-aided estimation is able to detect filter, gain and phase mismatches by using the cross-ratio property of preambles. Then the estimated result is programmed to correct this distortion. Through simulations in frequency-selective fading, they hint that this solution can solve I/Q imbalance with 2 dB gain error, 20° phase error and 180° filter mismatch.

Keywords

MIMO communication; OFDM modulation; filters; DC offset; MIMO-OFDM systems; cross-ratio property; filter mismatch; frequency offset; frequency-dependent I/Q imbalance compensator; link reliability; preamble-aided estimation; radio frequency imperfections; signal quality; Antennas; Fading; Gain; MIMO; OFDM; Receivers; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering and Technology (S-CET), 2012 Spring Congress on

Conference_Location

Xian

Print_ISBN

978-1-4577-1965-3

Type

conf

DOI

10.1109/SCET.2012.6342153

Filename

6342153