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The aim of this paper is to investigate channel estimation algorithms with carrier frequency offset in MIMO-OFDM systems. According to this, with investigating the channel estimation method, the authors will design optimum training courses for these systems and will introduce related comparative methods based on LMS and EM algorithms. On the other hand, the LS and MMSE channel estimation methods are introduced for MIMO-OFDM systems that on this basis pilots were inserted among subcarriers in transmitter with distances emerged of sampling theory then Least Square (LS) method was chosen for initial channel estimation in pilots at receiver. These algorithms use simple reversible and present a suitable estimation of channel.
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