Joint Estimation and Compensation for Frequency Selective IQ Imbalance in OFDM Systems 


Vol. 33,  No. 3, pp. 225-234, Mar.  2008


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  Abstract

Orthogonal Frequency Division Multiplexing (OFDM) systems utilizing direct conversion receiver suffer from frequency selective (FS) and frequency independent (FI) phase and gain imbalances caused by imperfect local oscillator and low pass filter. In this paper, we analyze the impacts of the transmit/receive IQ imbalances on the system and propose the estimation and compensation schemes for those imbalances. The preamble signals coded by Alamouti scheme in the frequency domain could be used in the estimation of relatively large IQ imbalances with FS and FI characteristics and the estimation results are used for the compensation of distortions caused by the FI and FS IQ imbalances. The optimal maximum likelihood (ML) receiver or suboptimal ordered successive interference cancallation (OSIC) receiver utilizing the estimation results show symbol error rate (SER) performance improvement compared to zero-forcing (ZF) technique due to diversity gain inherent in the frequency domain IQ imbalances combined with the frequency selective channels.

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  Cite this article

[IEEE Style]

Y. Jin, H. Kim, J. Kim, J. Ahn, "Joint Estimation and Compensation for Frequency Selective IQ Imbalance in OFDM Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 33, no. 3, pp. 225-234, 2008. DOI: .

[ACM Style]

Young-hwan Jin, Hye-jin Kim, Jik-dong Kim, and Jae-min Ahn. 2008. Joint Estimation and Compensation for Frequency Selective IQ Imbalance in OFDM Systems. The Journal of Korean Institute of Communications and Information Sciences, 33, 3, (2008), 225-234. DOI: .

[KICS Style]

Young-hwan Jin, Hye-jin Kim, Jik-dong Kim, Jae-min Ahn, "Joint Estimation and Compensation for Frequency Selective IQ Imbalance in OFDM Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 33, no. 3, pp. 225-234, 3. 2008.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880