Frequency-dependent I/Q Imbalance compensator for 2x2 MIMO-OFDM systems

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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 2x2 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.

Original languageEnglish
Title of host publication2012 Spring World Congress on Engineering and Technology, SCET 2012 - Proceedings
DOIs
StatePublished - 12 Dec 2012
Event2012 Spring World Congress on Engineering and Technology, SCET 2012 - Xi'an, China
Duration: 27 May 201230 May 2012

Publication series

Name2012 Spring World Congress on Engineering and Technology, SCET 2012 - Proceedings

Conference

Conference2012 Spring World Congress on Engineering and Technology, SCET 2012
CountryChina
CityXi'an
Period27/05/1230/05/12

Keywords

  • Filter mismatch
  • Frequency dependent imbalance (FDI)
  • I/Q imbalance
  • MIMO OFDM

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    Hsu, T-Y., Lai, W. C., & He, T. Y. (2012). Frequency-dependent I/Q Imbalance compensator for 2x2 MIMO-OFDM systems. In 2012 Spring World Congress on Engineering and Technology, SCET 2012 - Proceedings [6342153] (2012 Spring World Congress on Engineering and Technology, SCET 2012 - Proceedings). https://doi.org/10.1109/SCET.2012.6342153