Joint Synchronization and Channel Estimation with Optimum Training Sequences for OFDM-Based Systems Using EM Algorithm
نویسندگان
چکیده
In this paper, we propose a joint carrier frequency synchronization and channel estimation algorithm for multipleinput 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. MIMOOFDM 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.
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