Research And Realization On Synchronization Algorithm For MIMO SC-FDE Systems

Wireless communication has developed over the past 100 years since its inception,and it has gradually become one of the most important components of information industry.The MIMO SC-FDE system is widely used in wireless communication for its superiority,the synchronization technology is one of the most crucial parts.The SC-FDE system is sensitive to synchronization so that the synchronization algorithm would directly affect the performance of the whole system.The synchronization technology would make the MIMO SC-FDE system fully utilize its advantages in wireless communication.This paper mainly studies the synchronization algorithm in MIMO SC-FDE system.The main work is as follows:(1)The basic principle and advantages of MIMO technology and SC-FDE system are analyzed.Several typical algorithms of synchronization are researched,and the advantages and disadvantages are compared.A synchronization program suitable for application of the communication system in this paper is proposed,and its performance has been verified through simulation.The main modules of this synchronization program include bit/frame synchronization,timing tracking,main-path tracking.(2)For the bit/frame synchronization module,the iterative formulas are used to generate the Generalised Hierarchical Golay Sequences,and its performance is studied.Two kinds of matched filters are designed for different frame structures applicated in the scenarios when SNR is-20dB and-40dB,so that the correlation value can be quickly completed by occupying less hardware resources.Combined with the practical testing,channel model has been established.For the multipath effect and Doppler frequency,an improved method for bit/frame synchronization is proposed and its effect is verified by simulation.(3)For the timing tracking module,which is used to deal with the atomic clock frequency difference between the transmitter and the receiver,the early-late gate algorithm is used to estimate the sampling timing deviation.In order to improve the adjustment accuracy for recovering the sampling position,the fractional delay filter is used.Considering the loading and storage of filter coefficients,the Farrow structure is proposed to reduce the consumption of hardware resources.(4)After designing the synchronization program,the main modules such as bit/frame synchronization and tracking are implemented based on FPGA hardware platform,and the correctness of the code is verified by timing simulation.The synchronization part is embedded in the entire project of MIMO SC-FDE communication system.The performance of the whole system is verified by the practical test indoors and outdoors.Conclusion can be obtained that the synchronization program designed in this paper has good performance working in the MIMO SC-FDE system,and the implementation program on FPGA has strong stability and reliability.