论文标题
FDD巨大的MIMO-天线双链模式An-Reciprocity：缺失的砖块
FDD Massive MIMO -- Antenna Duplex Pattern an-Reciprocity : A Missing Brick
论文作者
论文摘要
在基站（BS）中获取链接（DL）通道状态信息（CSI）对于频率划分双链（FDD）大型MIMO（MM）系统具有挑战性。 DL培训和反馈需要大量开销。相反，研究通常假设FDD双链链路之间高度相关的平均空间信号特征（即定向簇）。但是，这些假设仅代表在双链带上具有相同辐射模式的天线的使用，从而导致同一群集的照明。在本文中，我们为实用的用户手机调查了双链频段上的模式互惠。我们首先展示了一组测得的当代电话如何表现出明显的双工模式差异。然后，我们显示了一个模拟手机的复杂模式的双工差异，其中去极化在增益差异之上。因此，我们揭示了FDD MM操作的DL CSI评估中有明显但被忽略的砖块。也就是说，为了使FDD MM性能研究是现实的，必须考虑实用的用户手机。
Obtaining down link (DL) channel state information (CSI) at the base station (BS) is challenging for frequencydivision-duplex (FDD) massive MIMO (MM) systems. Considerable overhead is required for DL training and feedback. Instead studies often assume highly correlated average spatial signal signatures (i.e. directional clusters) between FDD duplex links. These assumptions, however, only represent use of antennas with the same radiation pattern over the duplex band, leading to illumination of the same cluster. In this paper, we investigate pattern reciprocity, over the duplex band, for practical user handsets. We first show how a population of measured contemporary phones exhibits noticeable duplex pattern divergence. We then show measured complex pattern duplex divergence of a mock-up phone, where depolarization comes on top of gain differences. Thus we reveal a significant but overlooked brick in DL CSI assessment for FDD MM operation. Namely, in order for the FDD MM performance studies to be realistic, practical user handsets have to be considered.
