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由于在MIMO-OFDM系统中有多个发射和接收天线,并且每个接收天线都能接收到所有发射天线的信号,当各个收发天线之间的子信道延迟不同时,在每个接收天线端的帧同步检测就会受到其他天线发射同步信号的干扰。为了解决这个问题,我们提出了一种MIMO-OFDM系统的帧同步的设计方法及相应同步器的硬件结构设计。该同步单元可以实现时域和频域的同步,其中时域的同步是通过一组ZCZ码的匹配滤波器实现的,而频域的同步是通过同步帧的训练符号实现的。并且在Altera’s公司的FPGA开发板上实现了同步器的硬件设计。
Since there are multiple transmitting and receiving antennas in a MIMO-OFDM system and each receiving antenna can receive signals of all transmitting antennas, when sub-channel delays between the respective transmitting and receiving antennas are different, frames at each receiving antenna end Synchronization detection will be other antenna launch synchronization signal interference. In order to solve this problem, we propose a design method of frame synchronization in MIMO-OFDM system and the hardware structure design of the corresponding synchronizer. The synchronization unit can realize the synchronization in the time domain and the frequency domain, wherein the synchronization in the time domain is implemented by a matched filter of a group of ZCZ codes, and the synchronization in the frequency domain is realized by the training symbols of the synchronization frame. And in Altera’s FPGA development board to achieve the synchronization hardware design.