论文标题
无细胞和多细胞大型MIMO系统的强大功率分配和线性预编码
Robust Power Allocation and Linear Precoding for Cell-Free and Multi-Cell Massive MIMO Systems
论文作者
论文摘要
从第一代到第五代无线网络的移动网络操作中存在多电池（MC）系统，并考虑了所有用户到以单元格为中心的基站（BS）的信号。无细胞（CF）系统与大量分布式天线同时为用户提供服务。在这种情况下，多输入多输出（MIMO）技术都用于拓扑结构，并导致性能增长和干扰降低。为了获得上述好处，在下行链路（DL）中需要适当的预编码器设计和功率分配技术。通常，DL方案在发射机（CSIT）上采用完美的通道状态信息，这是不现实的。本文通过配备了DL中的线性预码器的MIMO系统研究MC和CF，并提出了一种自适应算法，以在存在不完美的CSIT的情况下分配功率。提出的鲁棒自适应分配优于标准自适应和均匀功率分配。模拟还使用强大的自适应功率分配和自适应功率分配的最小均方误差（MMSE）预码器比较了两个系统框架的性能。
Multi-Cell (MC) systems are present in mobile network operations from the first generation to the fifth generation of wireless networks, and considers the signals of all users to a base station (BS) centered in a cell. Cell-Free (CF) systems works with a large number of distributed antennas serving users at the same time. In this context, Multiple-input multiple-output (MIMO) techniques are used in both topologies and result in performance gains and interference reduction. In order to achieve the benefits mentioned, proper precoder design and power allocation techniques are required in the downlink (DL). In general, DL schemes assume perfect channel state information at the transmitter (CSIT), which is not realistic. This paper studies MC and CF with MIMO systems equipped with linear precoders in the DL and proposes an adaptive algorithm to allocate power in the presence of imperfect CSIT. The proposed robust adaptive power allocation outperforms standard adaptive and uniform power allocation. Simulations also compare the performance of both systems frameworks using minimum mean-square error (MMSE) precoders with robust adaptive power allocation and adaptive power allocation.
