Iterative frequency offset estimation in MIMO-OFDM systems

MIMO-OFDM is the promising technique in the future of wireless communications as it combines the properties of Multiple Input Multiple Output (MIMO) systems with the properties of Orthogonal Frequency Division Multiplexing (OFDM). However, its sensitivity to frequency offsets, usually resulting in inter-carrier interference (ICI), makes frequency synchronization necessary for data recovery in the receiver side. In this paper, a preamble-based frequency offset compensation method is proposed in which every single subcarrier is separately compensated for all the frequency offsets that are experienced while passing through the fading channel. Simulation results show that our proposed scheme is accurate in multipath fading channels and precisely recovers the data symbols.