ofdm下的空频编码，采用了空时分组码，用的ML译码硬判决-SFBC in OFDM system

Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) Maximum Like lihood (ML)

新算法可以大大降低计算复杂度,提高估算的精确性大大。即使信噪比非常低的，该算法依然可以有效工作-the new algorithm can decrease the computational complexity greatly, and increase the accuracy of the estimate greatly.the algorithm can work effectively even if the signal to noise ration is very low