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
doi: 10.3724/SP.J.1146.2008.00268
An Adaptive Tracking Metric for Finite Feedback Precoding in MIMO Systems
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摘要: 该文提出一种新的适用于无线相关信道中有限反馈预编码多输入多输出系统的预编码矩阵自适应跟踪测度。由于该测度在统计意义下对信道的相关性与预编码矩阵变化的关系具有更优化的描述，所以基于该测度的方案在保持较低反馈信息量的前提下，能够进一步改善预编码系统性能。文中给出优化自适应跟踪测度的理论推导。系统仿真分别针对无线信道的频域相关和时域相关，并结合空间分集和空间复用两类系统结构予以讨论，并验证了理论分析结果。另外，由于该测度方案算法复杂度更低，所以更具工程实用价值。Abstract: 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.
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