基于CAZAC序列的MIMO-OFDM定时同步算法

MIMO-OFDM Timing Synchronization Algorithm Based on the CAZAC Sequence

针对MIMO-OFDM系统定时同步中的精确度问题,提出一种基于CAZAC序列的定时同步方法。通过CAZAC序列优化帧的定时目标、准确度以及结构,使得帧和符号同步同时实现,简化定时算法。帧同步和符号同步的联合实现,降低了定时算法的计算量并能够准确定义信道的第一径,能够在时域实现整数频偏的估计,在提高同步精度的同时降低了系统的复杂度,通过仿真验证了算法在Rayleigh衰落信道中性能的明显改善。

A new synchronization method for MIMO-OFDM systems with CAZAC sequence was proposed.Frame timing objective functions were sharpen by using CAZAC Sequence,and its accuracy was also improved.Combing frame and symbol synchronization,only one step was needed for timing algorithm.The computation load was reduced and the first channel path was defined accurately.Integral frequency offset correction was achieved in time domain with a lower complexity.The proposed scheme can not only improve the precision of synchronization,but also reduce the complexity greatly.Simulation result shows it has a better performance than the traditional method especially in Rayleigh fading channel.