Spatially correlated MIMO broadcast channel: Analysis of overlapping correlation eigenspaces
Spatially correlated MIMO broadcast channel: Analysis of overlapping correlation eigenspaces
复制标题
空间相关 MIMO 广播信道：重叠相关特征空间分析
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Aria Nosratinia
中科院分区：
文献类型：
--
作者：
Fan Zhang;Mohamed Fadel;Aria Nosratinia
天线相关性在高频和大规模MIMO中普遍存在，因此相关MIMO广播信道的研究正成为人们越来越感兴趣的课题。本文探讨了这类系统的基本极限，重点讨论了相关特征空间既不独立也不恒等的情况，从而使得已知的波束-空间分割技术不能直接应用。我们首先介绍了发射天线相关下非相干点到点MIMO信道自由度的一个简单而新颖的紧外界。然后，我们分析了当一个相关特征空间是另一个的子空间时，两用户MIMO广播信道的性能。我们将结果推广到K-用户MIMO广播信道。我们的结果表明，利用发射天线对不同接收机的相关结构的差异来从系统中提取自由度增益是可能的。通过几个例子突出了这些收益的程度。
Antenna correlation is prevalent in higher frequencies as well as in massive MIMO, thus the study of correlated MIMO broadcast channels is becoming a subject of increasing interest. This paper explores the fundamental limits of such systems, focusing on cases where correlation eigenspaces are neither independent nor identical, so that known beam-space division techniques do not directly apply. We begin by introducing a simple but novel tight outer bound on the degrees of freedom of noncoherent point-to-point MIMO channels under transmit antenna correlation. We then analyze the performance of a two-user MIMO broadcast channel when one correlation eigenspace is a subspace of the other. We extend the result to K-user MIMO broadcast channel. Our results show that it is possible to exploit the differences between the correlation structure of transmit antennas towards different receivers to extract degrees of freedom gains out of the system. The extent of these gains are highlighted via several examples.