Blind Carrier-Frequency Offset Estimation in SISO, MIMO, and Multiuser OFDM Systems

Blind Carrier-Frequency Offset Estimation in SISO, MIMO, and Multiuser OFDM Systems Relying on a kurtosis-type criterion, we develop a low-complexity blind carrier-frequency offset (CFO) estimator for orthogonal frequency-division multiplexing (OFDM) systems. We demonstrate analytically how identifiability and performance of this blind CFO estimator depend on the channel´s frequency selectivity and the input distribution. We show that this approach can be applied to blind CFO estimation in multi-input/multi-output and multiuser OFDM systems. The issues of channel nulls, multiuser interference, and effect of multiple antennas are addressed analytically, and tested via simulations.