标题： 面向小区边缘的下行大规模MIMO蜂窝网络预编码 显示英文标题

标题： Cell-Edge-Aware Precoding for Downlink Massive MIMO Cellular Networks

摘要： 我们提出了一种基站边缘感知（CEA）零 forcing（ZF）预编码器，该预编码器利用大量基站（BS）天线提供的额外空间自由度，在最易受干扰的用户设备（UEs）上抑制小区间干扰。 我们评估了CEA-ZF以及传统基站边缘不感知（CEU）ZF预编码器在具有随机基站拓扑的网络中的下行链路性能。 我们的分析和仿真表明，所提出的CEA-ZF预编码器在以下方面优于CEU-ZF预编码： (i) 每个小区的总数据速率，(ii) 覆盖概率，以及 (iii) 95% 的可能速率，或边缘用户速率。 特别是，当基站同时具备完美的信道状态信息和大量的天线 N 时，我们证明在 CEA-ZF 和 CEU-ZF 下的中断概率分别以 1/N^2 和 1/N 的速度衰减。 这一结果表明 CEA-ZF 是一种更有效的大规模 MIMO 小区网络预编码方案。 我们的框架还揭示了调度每个基站最优 UE 数量的重要性，并确认了在信道估计阶段控制接收到的导频污染量的必要性。 显示英文摘要

摘要： We propose a cell-edge-aware (CEA) zero forcing (ZF) precoder that exploits the excess spatial degrees of freedom provided by a large number of base station (BS) antennas to suppress inter-cell interference at the most vulnerable user equipments (UEs). We evaluate the downlink performance of CEA-ZF, as well as that of a conventional cell-edge-unaware (CEU) ZF precoder in a network with random base station topology. Our analysis and simulations show that the proposed CEA-ZF precoder outperforms CEU-ZF precoding in terms of (i) aggregate per-cell data rate, (ii) coverage probability, and (iii) 95%-likely, or edge user, rate. In particular, when both perfect channel state information and a large number of antennas N are available at the BSs, we demonstrate that the outage probability under CEA-ZF and CEU-ZF decay as 1/N^2 and 1/N, respectively. This result identifies CEA-ZF as a more effective precoding scheme for massive MIMO cellular networks. Our framework also reveals the importance of scheduling the optimal number of UEs per BS, and confirms the necessity to control the amount of pilot contamination received during the channel estimation phase.