大规模MIMO HetNets中的干扰管理：嵌套阵列方法
Interference Management in Massive MIMO HetNets: A Nested Array Approach
摘要：
嵌套天线阵是一种通过非均匀天线布局实现N个天线阵的O（N^2）自由度（DoF）的有效方法。这样的DoF指的是可以分辨的输入信号的方向的数量。随着自由度的增加，嵌套阵列的一个重要应用是消除来自多个方向的干扰信号。在本文中，我们应用嵌套阵列在一个大规模的MIMO异构网络（HetNet）的干扰管理。利用基于嵌套阵列的干扰置零，每个基站（BS）可以使一定数量的干扰信号置零。关键的设计问题是选择要在每个BS处消除的干扰源。我们制定这个问题作为一个整数规划问题。目标是最大化所有用户的总速率，服从BS DoF约束。我们提出了一个近似方案来解决这个问题，并推导出性能上界。仿真结果表明，该方案有效地提高了和速率，并达到了接近最优的性能。
英文摘要：
The nested array, which is implemented by nonuniform antenna placement, is an effective approach to achieve O(N^2) degrees of freedom (DoF) with an antenna array of N antennas. Such DoF refers to the number of directions of incoming signals that can be resolved. With the increased number of DoF, an important application of nested array is to nullify the interference signals from multiple directions. In this paper, we apply nested array in a massive MIMO heterogeneous network (HetNet) for interference management. With nested array based interference nulling, each base station (BS) can nullify a certain number of interference signals. A key design issue is to select the interference sources to be nullified at each BS. We formulate this problem as an integer programming problem. The objective is to maximize the sum rate of all users, subject to BS DoF constraints. We propose an approximation scheme to solve this problem and derive a performance upper bound. Simulation results show that the proposed scheme effectively improves the sum rate and achieves a near optimal performance.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
