多重周期训练序列的OFDM同步技术研究

摘要

This paper studies the application of a multi-periodic preamble for the synchronization in OFDM systems.In contrast to common system configurations, the multi-periodic preamble enables to select the two parameters correlation shift and correlation window length independently of each other. This improves the accuracy of carrier frequency offset( CFO) and symbol timing synchronization and decreases the impact of random noise on system synchronization. The theoretical analysis and simulation results show that this technique can improve the system performance, compared with the conventional algorithm.%通过对多种正交频分复用（ OFDM）同步算法的分析，研究了一种基于多重周期训练序列的OFDM同步算法，采用多重周期训练序列的同步估计算法可以独立选择相关偏移和窗长度2种参数，这就增加了载波偏移估计的准确度和符号定时同步的精确度，减少了随机噪声对系统同步的影响，通过理论分析和仿真实验表明与常规算法相比，提高了系统性能。