An Adaptive Tracking Metric for Finite Feedback Precoding in MIMO Systems
一种多输入多输出系统中有限反馈预编码的自适应跟踪测度

This paper proposes a novel adaptive tracking metric for precoding matrices in finite feedback precoding MIMO systems with wireless correlated channels. From the statistical point of view, this metric has an optimal property to describe the relationship of channel correlation and the changes of precoding matrices. Therefore, based on keeping low amount of feedback data, this metric scheme improves further the precoding system performance. The derivation of the optimal adaptive tracking metric is given. System simulations aim at the correlations in frequency and temporal domains of wireless channels, which are combined with spatial diversity and multiplexing system structures. The theoretical analysis conclusion is verified by these results. In addition, for the lower complexity of this metric scheme, it is more valuable in practice.