LTE 下行链路信道估计，有MMSE，LS，理想估计三种方式-LTE downlink channel estimation, a MMSE, LS, ideal estimated three ways

用于LTE下行链路系统主构架的建立，为进一步仿真搭建好的平台-For the establishment of the main frame of the LTE downlink system, to build a good platform for further simulation