标题： 下行链路功率控制在具有最优用户关联的大规模MIMO蜂窝系统中的应用 显示英文标题

标题： Downlink Power Control for Massive MIMO Cellular Systems with Optimal User Association

摘要： 本文旨在当每个用户由基站（BS）的优化子集服务时，最小化大规模MIMO（多输入多输出）下行蜂窝系统的总发射功率消耗。 我们推导了在瑞利衰落信道和最大比传输（MRT）下，当基站使用非相干联合传输进行协作时，遍历频谱效率（SE）的下界。 我们在固定的SE约束下最优地解决了联合用户关联和下行发射功率最小化问题。 此外，我们解决了一个具有用户特定权重的最大最小公平性问题，该问题最大化用户之间的最差SE。 推导出了最优的基站-用户关联规则，该规则不同于最大信噪比（max-SNR）关联。 仿真结果表明，所提出的方法可以在使用比小规模系统更少的发射功率的情况下为用户提供良好的SE，并且当需要时，最优的用户关联可以有效地在基站之间平衡负载。 显示英文摘要

摘要： This paper aims to minimize the total transmit power consumption for Massive MIMO (multiple-input multiple-output) downlink cellular systems when each user is served by the optimized subset of the base stations (BSs). We derive a lower bound on the ergodic spectral efficiency (SE) for Rayleigh fading channels and maximum ratio transmission (MRT) when the BSs cooperate using non-coherent joint transmission. We solve the joint user association and downlink transmit power minimization problem optimally under fixed SE constraints. Furthermore, we solve a max-min fairness problem with user specific weights that maximizes the worst SE among the users. The optimal BS-user association rule is derived, which is different from maximum signal-to-noise-ratio (max-SNR) association. Simulation results manifest that the proposed methods can provide good SE for the users using less transmit power than in small-scale systems and that the optimal user association can effectively balance the load between BSs when needed.