Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) is one of the key technologies in the next generation broadband wireless communication systems.It is very sensitive to timing synchronization

which includes frame synchronization and symbol synchronization.Distributed antenna system (DAS) is considered as an open architecture for future communication systems.With the DAS architecture

the frame synchronization becomes more difficult and more complex.Therefore

it is in urgent need of a performance analysis method to guide the frame synchronization algorithm design.This paper proposed an accurate performance analysis method for frame synchronization in distributed MIMO-OFDM system.The proposed method

which is a Gaussian performance analysis method based on the statistical properties of frame synchronization metric function

is introduced by orthogonally decomposing some signals into the direction angle of dominated signal.The correct frame synchronization probability is calculated by using the 3 sigma principle of the normal distribution.Finally

the accuracy and effectiveness of the proposed method is examined by its applications to different transmitting antenna numbers and several existing algorithms.