论文标题
在无单元的无线网络中，Uplink-Downlink二元性和预编码策略与部分CSI
Uplink-Downlink Duality and Precoding Strategies with Partial CSI in Cell-Free Wireless Networks
论文作者
论文摘要
我们考虑一个可扩展的以用户为中心的无线网络，该网络具有由Björnsson和Sanguinetti定义的动态群集形成。在显示出主导渠道子空间信息对于上行链路（UL）试验净化的重要性之后，并在以前的工作中检查了不同的UL组合方案后，我们在这里研究了下行链路（DL）的预编码策略。评估了分布式可扩展的DL预编码和功率分配方法，以针对不同的天线分布，用户密度和UL PILOT尺寸进行评估。我们将分布式功率分配方法与基于特定形式的UL-DL二元性的方案进行比较，该方案可以由中央处理器根据可用部分通道状态信息进行计算。新的二元方法为UL和DL实现了几乎对称的“乐观的Ergodic率”，同时节省了相当大的计算复杂性，因为UL组合向量被重复使用为DL预码器。
We consider a scalable user-centric wireless network with dynamic cluster formation as defined by Björnsson and Sanguinetti. After having shown the importance of dominant channel subspace information for uplink (UL) pilot decontamination and having examined different UL combining schemes in our previous work, here we investigate precoding strategies for the downlink (DL). Distributed scalable DL precoding and power allocation methods are evaluated for different antenna distributions, user densities and UL pilot dimensions. We compare distributed power allocation methods to a scheme based on a particular form of UL-DL duality which is computable by a central processor based on the available partial channel state information. The new duality method achieves almost symmetric "optimistic ergodic rates" for UL and DL while saving considerable computational complexity since the UL combining vectors are reused as DL precoders.
