论文标题
毫米波通信的低复杂性多播横梁成形
Low-Complexity Multicast Beamforming for Millimeter Wave Communications
论文作者
论文摘要
为了开发用于毫米波通信的低复杂性多播束式方法，我们首先在本文中提出了一种通道增益估计方法。我们使用横梁扫地来找到最佳的代码字及其两个相邻的代码字，以形成一个复合梁。然后，我们根据复合梁估算了通道增益，该复合梁是通过最小化梁覆盖范围内的梁增益方差来离线计算的。通过估计的通道增益，我们提出了一种在最大最大博览会（MMF）标准下的多播束形设计方法。为了降低计算复杂性，我们将大型天线阵列分为几个小型子阵列，其中每个子阵列的大小由估计的通道增益确定。特别是，我们引入了每个子阵列探索所考虑问题的额外自由度的阶段因素。仿真结果表明，与现有方法相比，提出的多播束式设计方法可以通过几乎没有绩效牺牲而大大降低计算复杂性。
To develop a low-complexity multicast beamforming method for millimeter wave communications, we first propose a channel gain estimation method in this article. We use the beam sweeping to find the best codeword and its two neighboring codewords to form a composite beam. We then estimate the channel gain based on the composite beam, which is computed off-line by minimizing the variance of beam gain within beam coverage. With the estimated channel gain, we propose a multicast beamforming design method under the max-min fair (MMF) criterion. To reduce the computational complexity, we divide the large antenna array into several small-size sub-arrays, where the size of each sub-array is determined by the estimated channel gain. In particular, we introduce a phase factor for each sub-array to explore additional degree of freedom for the considered problem. Simulation results show that the proposed multicast beamforming design method can substantially reduce the computational complexity with little performance sacrifice compared to the existing methods.
