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Overview: A major source of impairments in high-frequency wireless system implementations is the imbalance between the Inphase (I) and Quadrature-phase (Q) branches; or equivalently, the real and imaginary parts of the complex signal. This paper is published by Institute of Electrical and Electronics Engineers explains the effect of both the transmitter and receiver IQ imbalances in an OFDM system is studied and algorithms are developed to compensate for such distortions in the digital domain. The algorithms include post-FFT least-squares and adaptive equalization, as well as a pre-distortion scheme at the transmitter and a pre-FFT correction at the receiver.
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