论文标题
FDD下行链路巨大的MIMO的稳健非连接光束形成
Robust Non-Coherent Beamforming for FDD Downlink Massive MIMO
论文作者
论文摘要
由于难以获得通道状态信息（CSI）的困难，因此已知频划分双工（FDD）的下行链路（DL）设计波束形成技术是一个具有挑战性的问题。实际上，由于上行链路链接频段是不相交的，因此该系统不能依靠通道互惠来估算上行链路（UL）飞行员的通道，因为（UL）飞行员在时空划分双工（TDD）系统中估算了通道。尽管如此，在本文中，我们为不需要用户的任何反馈而只依靠UL飞行员的传输而提出了针对强大的束缚器的原始设计。支付的代价是，波束形式是不连贯的，因为它不利用每个多路径组件的阶段的全部知识。在不同的标准和部分阶段知识下提出了各种各样的新型设计。
Designing beamforming techniques for the downlink (DL) of frequency division duplex (FDD) massive MIMO is known to be a challenging problem due to the difficulty of obtaining channel state information (CSI). Indeed, since the uplink-downlink bands are disjoint, the system cannot rely on channel reciprocity to estimate the channel from uplink (UL) pilots as in time division duplexing (TDD) system. Still, in this paper, we propose original designs for robust beamformers that do not require any feedback from the users and only rely on the transmission of UL pilots. The price to pay is that the beamformer is non-coherent in the sense that it does not leverage full knowledge of the phase of each multipath component. A large variety of novel designs are proposed under different criterion and partial phase knowledge.
