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In this paper, the authors investigate the effects of asymmetric frequency-dependent joint transmit-receive I/Q imbalance on the performance of beamforming MIMO-OFDM systems. They derive the throughput-maximizing transmit/receive beamforming coefficients taking into account I/Q imbalance effects. In addition, they propose a low-complexity pilot-aided scheme for the estimation of the channel and I/Q imbalance parameters. Their simulation results demonstrate the effectiveness of the proposed generalized beamforming scheme in mitigating I/Q imbalance effects.
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