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Joint Synchronization and Channel Estimation with Optimum Training Sequences for OFDM-Based Systems Using EM Algorithm


Navid Daryasafar, Omid Borazjani


Vol. 16  No. 7  pp. 54-59


In this paper, we propose a joint carrier frequency synchronization and channel estimation algorithm for multiple-input and multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems. A major challenge to MIMO-OFDM systems is how to obtain the channel state information accurately and promptly for coherent detection of information symbols and channel synchronization. MIMO-OFDM systems are very sensitive to synchronization errors, especially the carrier frequency offset (CFO). The carrier frequency synchronization and channel estimation are carried out repetitively through the Expectation?Maximization (EM) algorithm using an OFDM preamble symbol. It is revealed by the simulation results that the proposed scheme achieves ideal performance.


MIMO-OFDM, Frequency Synchronization, CFO, Channel Estimation, EM Algorithm