中文说明：应用背景此文件包含在MIMO系统的发射端CSI已知和未知的区别。充水algourithm使用的情况下，CSI是已知的。关键技术
English Description：
Application background This file contains diffrence between CSI known and unknown at transmitter in case of MIMO systems. Water Filling algourithm used in case of CSI is known. Key TechnologyThe Key technology here is LTE-Advances that can support MU-MIMO and MAssive MIMO