一种有效的MIMO-OFDM系统时频同步方法

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。

An Efficient Timing-and-Frequency Synchronization Method for MIMO-OFDM System

To detect different antenna delay and frequency offset and improve synchronization algorithm of MIMO-OFDM system,this paper proposes an efficient timing-and-frequency synchronization algorithm for MIMO-OFDM system.The proposed algorithm constructs a novel orthogonal training sequence structure based on CAZAC codes,with which the effective estimation of delay and carrier frequency offset of each transmission antenna could be achieved.Simulation results indicate that the proposed method is of high timing estimation precision and low computing complexity,and is suitable for MIMO-OFDM system with different delays of each transmission antenna,thus has good practical value.