Multiple input multiple output (MIMO) systems provide dramatic capacity gain through an increased spatial dimension. However, the capacity gain is reduced if the channel state information (CSI) is not perfect. The more exact the CSI is, the higher capacity gain we can obtain. In order to obtain higher capacity gain, this paper analyzes the two factors which mainly affect the reliability of CSI: the quality of channel estimation and the feedback delay, and proposes a channel modification strategy, which can optimally reduce the effect of the two factors and obtain more exact CSI. Simulation shows that the channel modification strategy is effective.
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