Abstract In this paper, we study the optimization of two tilt angles corresponding to two antenna arrays in each base station (BS) of a massive multiple-input multiple-output system. We consider two scenarios with perfect channel state information (CSI) and imperfect CSI. In the limit of the number of the BS antennas, the channel orthogonality is employed to derive the limit and the lower bound of the throughputs. By maximizing the lower bound or the limit throughput, the two antenna tilt angles are optimized. Simulation results show that the throughput performance can be improved with the designed tilt angles.

中文翻译：

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具有两个倾斜度的多小区大规模多输入多输出 (MIMO) 系统的天线倾斜度优化

摘要 在本文中，我们研究了大规模多输入多输出系统的每个基站（BS）中对应于两个天线阵列的两个倾斜角的优化。我们考虑具有完美信道状态信息 (CSI) 和不完美 CSI 的两种场景。在基站天线数量的限制下，采用信道正交性来推导出吞吐量的限制和下界。通过最大化下限或极限吞吐量，优化了两个天线倾斜角。仿真结果表明，通过设计的倾斜角可以提高吞吐量性能。