MIMO-OFDM channel estimation in the presence of I/Q imbalance and phase noise for IEEE 802.11N

In this paper, we propose a robust non-iterative pilot-aided channel estimator for multi-input multi-output orthogonal frequency division multiplexing systems in the presence I/Q imbalance and phase noise. We show that by exploiting the phase noise and I/Q imbalance properties, the joint cost function for estimating them reduces to separate cost functions, each of which can be readily solved. Mean-squared-error performance of the proposed estimator is evaluated for IEEE 802.11n wireless local area network applications.