Journal of Theoretical and Applied Information Technology
For downlink adaptive controlling, feedback from the UE used can highly improve user data rate. The adaptive algorithm provides the gain of high peak rates (dual stream) when close to the cell and good cell edge performance (single stream). In this paper, firstly, it described CL loop MIMO adaptive switch for TD-LTE system, moreover, explained three UE feedback categories, CQI, PMI, RI mode, especially expatiated on 2 different CQI mode theoretical calculation and application. Finally, the paper gives and analyses the detailed simulation for different transmission mode and also gets some technical conclusion.