MIMO􀀁 OFDM 技术将成为第4 代移动通信系统的关键技术, 因MIMO􀀁 OFDM 对时间和频率偏移非常敏感,

因此MIMO􀀁 OFDM 同步显得尤为重要。提出了一种新的MIMO􀀁 OFDM 定时同步和频偏同步技术。以GCL 序列为基础设

计了一个新的符合MIMO􀀁 OFDM 同步技术的导频序列, 通过对该导频序列进行2 次相关得到频率估计, 并将所得频率

运用到定时同步中, 得到更为准确的时间估计。仿真结果表明, 在相同的信噪比情况下, 该方法可以使得系统的误码

率和帧传送误码率相对传统方法得到进一步减小。-MIMO􀀁 OFDM will become a key technology of the fourth generation mobile communications system. However, MIMO􀀁 OFDM is

sensitive to the CFO and timing synchronization, so the MIMO􀀁 OFDM synchronization technology is very important. This paper proposes an

accurate technique for timing and frequency synchronization of multiple􀀁 input multiple􀀁 output ( MIMO ) orthogonal frequency division

multiplexing ( OFDM) systems. The technique derives a new preamble signal based on GCL sequences, according with the MIMJO􀀁 OFDM

synchronization. The carrier frequency offset ( CFO) estimation is obtained through taking double correlation operations on the preamble signal,

and used in the timing synchronization to gain accurate time estimation. The simulation results show that at the same SNR, the proposed method

can reduce the BER and the fr a me transmission BER of the system compared to the conventional method.