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MIMO-OFDM技术将是下一代无线通信中的关键技术。分布式MIMO-OFDM系统因其大容量,低功耗,更好的覆盖等优势而得到广泛应用,但现在对MIMO-OFDM系统同步问题的研究大多在集中式MIMO-OFDM系统下。本文提出了一种基于训练序列的分布式系统的定时和频率同步方法,通过对训练序列进行一些相关运算,能够估计出多个时间偏移和单个的频率偏移。仿真结果表明,新提出的方法在定时同步的正确率和频率同步的均方误差方面表现出了很好的性能。
MIMO-OFDM technology will be the key technology in the next generation of wireless communications. Distributed MIMO-OFDM systems are widely used due to their advantages such as large capacity, low power consumption and better coverage. However, the research on MIMO-OFDM system synchronization is mostly under centralized MIMO-OFDM systems. In this paper, a timing and frequency synchronization method based on training sequence in distributed system is proposed. By performing some correlation operations on training sequences, multiple time offsets and single frequency offsets can be estimated. The simulation results show that the proposed method shows good performance in the accuracy of timing synchronization and the mean square error of frequency synchronization.