Novel Carrier Frequency Offset Estimator in MIMO-OFDM System

In this paper, we address the problem of carrier frequency offset (CFO) estimation for multipleinput multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. We reconstruct the received signal to form data model with multi-invariance property, and then multiinvariance MUSIC algorithm for CFO estimation is proposed. Our proposed algorithm has the better CFO estimation performance than ESPRIT method and multi-invariance ESPRIT, and even works well without virtual carrier. Furthermore, our algorithm qualifies the estimation for both integer CFO and fractional CFO. Simulation results illustrate performance of this algorithm.