A DoF-Based Link Layer Model for Multi-Hop MIMO Networks
A DoF-Based Link Layer Model for Multi-Hop MIMO Networks
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DOI：
10.1109/tmc.2013.122
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发表时间：
2014-07
影响因子：
7.9
通讯作者：
Yi Shi;Jia Liu;Canming Jiang;Cunhao Gao;Yiwei Thomas Hou
中科院分区：
文献类型：
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作者：
Yi Shi;Jia Liu;Canming Jiang;Cunhao Gao;Yiwei Thomas Hou
迄今为止，MIMO的快速发展主要停留在物理层。这些成果并没有完全使MIMO在网络层的研究受益，主要是由于与MIMO涉及的基于矩阵的模型相关联的计算复杂度。最近，已经有一些努力来简化用于MIMO的链路层模型，以便于在上层的研究。这些模型只需要对MIMO的自由度（DoF）进行简单的数值计算，即可表征空间复用（SM）和干扰消除（IC）。因此，这些模型比通信世界中最初的基于矩阵的模型简单得多。然而，这些基于自由度的模型的可实现的自由度区域没有被分析。在本文中，我们重新审视MIMO建模的这一重要问题。在考虑了多跳MIMO网络中SM和IC的DoF消耗情况的基础上，提出了一种易于处理的多跳MIMO网络链路层模型。我们表明，在共同的假设自由度为基础的模型和额外的假设没有依赖周期，该模型包括所有的可行的解决方案，基于矩阵的模型下SM和IC的任何网络拓扑结构。该工作为多跳MIMO网络的理论研究提供了重要的基础。
The rapid advances of MIMO to date have mainly stayed at the physical layer. Such fruits have not fully benefited MIMO research at the network layer mainly due to the computational complexity associated with the matrix-based model that MIMO involves. Recently, there have been some efforts to simplify link layer model for MIMO so as to facilitate research at the upper layers. These models only require simple numeric computations on MIMO's degrees-of-freedom (DoFs) to characterize spatial multiplexing (SM) and interference cancellation (IC). Thus, these models are much simpler than the original matrix-based model from the communications world. However, achievable DoF regions of these DoF-based models are not analyzed. In this paper, we re-visit this important problem of MIMO modeling. Based on accounting of how DoFs are consumed for SM and IC, we develop a tractable link layer model for multi-hop MIMO networks. We show that under common assumptions of DoF-based models and additional assumption of no dependency cycle, this model includes all the feasible solutions by the matrix-based model under SM and IC for any network topology. This work offers an important building block for theoretical research on multi-hop MIMO networks.