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Estimation and Compensation of I/Q Imbalance in OFDM Direct-Conversion Receivers

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2 Author(s)
Kuang-Yu Sung ; Inst. of Commun. Eng., Nat. Tsing Hua Univ., Hsinchu ; Chi-chao Chao

In this paper, we consider estimation and compensation of the I/Q imbalance generated by the direct-conversion receiver in orthogonal frequency division multiplexing (OFDM) systems. Two methods for I/Q imbalance compensation are proposed: the maximum-likelihood estimation (MLE)-based method and the least-square estimation (LSE)-based method. Computer simulations are conducted for comparisons of the performance. Effects of timing and frequency offsets on performance are also analyzed. The MLE-based method generally performs well even at low signal-to-noise ratio (SNR) and is robust against timing and frequency offsets. The LSE-based method outperforms the MLE-based method at higher SNR. Both methods are robust against different gain and phase imbalances.

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Selected Topics in Signal Processing, IEEE Journal of  (Volume:3 ,  Issue: 3 )