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同步问题是卫星通信中的一个关键问题,直接关系到通信系统的性能。文中简要介绍了OFDM的同步技术,主要讨论了符号定时同步和载波同步。最大似然估计算法在OFDM符号定时同步和载波频率同步中得到了广泛的应用,通过最大似然估计方法,避免了基于导频符号的同步估计带来的频率和功率资源的浪费,通过仿真可以看到,能够很好地实现OFDM系统的符号同步和载波同步。
Synchronization is a key issue in satellite communications and is directly related to the performance of the communications system. This paper briefly introduces the OFDM synchronization technology, mainly discusses the symbol timing synchronization and carrier synchronization. Maximum likelihood estimation algorithm has been widely used in OFDM symbol timing synchronization and carrier frequency synchronization. Maximum likelihood estimation method can avoid the waste of frequency and power resources caused by pilot symbol based synchronization estimation. Through simulation, It can be seen that the symbol synchronization and carrier synchronization of the OFDM system can be well achieved.