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为了检测不同天线的时延和频偏,提高多输入多输出正交频分复用(MIMO-OFDM)系统同步算法性能,给出了一种有效的MIMO-OFDM系统定时和频率同步算法。该算法构造了一种新颖的基于恒包络零自相关码(CAZAC)的良好正交特性的训练序列结构,利用该训练序列结构可以有效地完成各发射天线的迟延和载波频偏估计。仿真结果表明,所给方法具有高的定时估计精度和低的计算复杂度,适用于各发射天线信号到达时延不同情况的MIMO-OFDM系统,具有很好的实用价值。
In order to detect the delay and frequency offset of different antennas and improve the performance of MIMO-OFDM system synchronization algorithm, an effective timing and frequency synchronization algorithm for MIMO-OFDM system is proposed. This algorithm constructs a novel training sequence structure based on the good orthogonality of Constant Encapsulated Zero Autocorrelation Codes (CAZAC). With this training sequence structure, the delay of each transmitting antenna and carrier frequency offset estimation can be effectively accomplished. The simulation results show that the proposed method has high timing estimation accuracy and low computational complexity, and is suitable for MIMO-OFDM system with different signal arrival delay of each transmitting antenna. It has good practical value.