基于LS算法的MIMO-OFDM频率同步

LS-based Frequency Synchronization for MIMO-OFDM Systems

频率同步是MIMO-OFDM同步技术必须解决的问题之一,但是传统的基于ML算法的频率偏移估计条件要求苛刻,计算复杂,因此对CFO简单算法的探究势在必行。为此提出一种基于LS算法的频率偏移估计,并将其性能与基于ML的频率偏移估计的性能进行比较。仿真结果表明,LS算法性能等同于ML算法性能。基于LS算法的简单性和使用条件的低约束性,可使用LS算法获得和ML算法相同的频偏估计。

One of the key issues of MIMO-OFDM synchronization is frequency synchronization.However,the condition of conventional ML-based CFO is rigorous and computation is complex.So,It is imperative to explore a new method of CFO.CFO based on least square（LS） was proposed,and LS-based CFO was compared with one of ML-based CFOs.The simulation results showed that the performance of LS is equivalent to that of ML.LS-based CFO is simple and less restrict.The simple LS method can be used to obtain the same CFO as using ML.