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This paper discuss three synchronization method of MIMO-OFDM Systems whose training sequence base on the CAZAC sequence for distributed systems. First method use the CAZAC sequence, the second and third methods use improved CAZAC sequence. The simulation results shows the accuracy of three methods and the training sequence with changed CAZAC is better than the sequence without change.

Inter carrier interference (ICI) are widespread in the orthogonal frequency division multiplexing (OFDM) communication systems. This paper mainly discusses two ICI self-cancellation algorithms, the data-conversion based ICI self-cancellation algorithm and the data-conjugate based ICI self-cancellation algorithm. The properties and the application environments are also given. Simulation results show that the performance of the data-conversion based ICI self-cancellation algorithm is superior to the data-conjugate based ICI self-cancellation algorithm in mobile environment, while the data-conjugate based ICI self-cancellation algorithm self-cancellation algorithm has better bit error rate perfomence than the data-conversion based ICI self-cancellation algorithm in small phase noise circumstance.

This paper describes an improved timing synchronization algorithm for the distribued MIMO-OFDM systems with the CAZAC sequence. This algorithm uses a training sequence which is based on the CAZAC sequence and makes the frame timing objective function with sharper property and thus has good effects on the time delay estimation scheme for different antenna. The simulation results for the distribued MIMO-OFDM systems shows that the improved algorithm has higher accuracy than one of the conventional algorithm.