Lens antenna array (LAA) has been widely studied to reduce the number of RF chains in millimeter wave communication systems. It is a critical issue to make a tradeoff between the hardware cost and the ability to cope with the power leakage problem. In this letter, we propose a low-cost group-selected structure without necessitating the high-cost phase shifters. More specifically, the antennas are divided into several groups equally at first. Then each radio frequency (RF) chain selects one antenna group via a switch network and the signal from this RF chain is transmitted through the antennas in the selected group with its power equally divided. Results show that the proposed structure performs similarly to the state-of-the-art structures intended for power leakage reduction with much lower hardware cost and training complexity requirements.

中文翻译：

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具有透镜天线阵列的多用户毫米波系统中的低成本组选结构


透镜天线阵列（LAA）已被广泛研究，以减少毫米波通信系统中的射频链数量。在硬件成本和应对漏电问题的能力之间进行权衡是一个关键问题。在这封信中，我们提出了一种低成本的组选结构，而不需要高成本的移相器。更具体地，首先将天线均分为若干组。然后，每个射频（RF）链通过交换网络选择一个天线组，并且来自该RF链的信号通过所选组中的天线发射，其功率均分。结果表明，所提出的结构的性能与旨在减少功耗的最先进结构类似，且硬件成本和训练复杂性要求低得多。