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提出了一种基于导频信号改进的多输入多输出正交频分复用(Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing,MIMO-OFDM)系统定时及频偏的同步方法。该方法以GCL序列为基础,以Minn算法为原型设计了一个新的导频结构。首先,以正负1为基础引入伪随机序列来改进算法,以判决函数求得定时同步位置,然后,代入公式再进行两次相关计算,取其频率偏移的平均值,从而得出较为准确的定时同步准确率和频率偏移。仿真结果表明,改进的导频结构和算法在定时同步及频偏估计方面均具有良好的性能。
A synchronization method of timing and frequency offset in MIMO-OFDM system based on pilot signal is proposed. Based on the GCL sequence, this method designs a new pilot structure based on the Minn algorithm. First of all, based on the positive and negative 1, the pseudo-random sequence is introduced to improve the algorithm. The decision function is used to obtain the timing synchronization position. Then, the formula is substituted into the formula to make two correlation calculations, taking the average value of the frequency offset, The timing synchronization accuracy and frequency offset. Simulation results show that the improved pilot structure and algorithm have good performance in timing synchronization and frequency offset estimation.