Energy-Efficient Hybrid Precoding for mmWave MIMO Systems With Phase Modulation Array
Energy-Efficient Hybrid Precoding for mmWave MIMO Systems With Phase Modulation Array
复制标题
具有相位调制阵列的毫米波 MIMO 系统的节能混合预编码
DOI：
10.1109/tgcn.2020.2974282
复制
发表时间：
2020-09-01
影响因子：
4.8
通讯作者：
Yang, Jing
中科院分区：
文献类型：
--
作者：
Hei, Yongqiang;Yu, Shangju;Yang, Jing
混合预编码技术旨在减少RF链的数量而不明显的性能损失，成为5G通信中有希望的候选者。针对毫米波MIMO系统，提出了一种能量有效的混合预编码方法，该方法采用基于相位调制阵列（PMA）的模拟预编码代替移相器，以降低功耗，提高能量效率。具体而言，PMA，由延迟线和开关，使控制相位和幅度同时进行，从而施加额外的约束的模拟预编码。在此基础上，提出了基于PMA的毫米波系统的混合预编码问题。此外，针对全连接和子连接混合预编码器，分别提出了一种增强的正交约束算法和交替优化算法。此外，一个更现实的情况下，存在一个最小的开关持续时间时，RF开关打开，被认为是建议的基于PMA的混合预编码器。仿真结果表明，与基于移相器的预编码相比，基于PMA的预编码可以获得更高的频谱效率和能量效率。更重要的是，所提出的基于PMA的混合预编码器可以显著减少射频链的数量，导致其在5G绿色通信中的应用的低能耗。
The hybrid precoding technique targeted at reducing the number of RF chains without obvious performance loss becomes a promising candidate in 5G communication. In this paper, an energy efficient hybrid precoding is proposed for the mmWave MIMO systems, in which phase modulation array (PMA) based analog precoding is adopted instead of phase shifters to reduce the power consumption and improve the energy efficiency. Specifically, PMA, consisting of delay lines and switches, enables to control phase and amplitude simultaneously, thus imposes additional constraint on the analog precoding. On this basis, the hybrid precoding problem is formulated for the PMA-based mmWave systems. Furthermore, an enhanced orthogonal constraint algorithm and an alternating optimization algorithm are proposed for the full-connected and sub-connected hybrid precoders, respectively. In addition, a more realistic situation, that there exists a minimum switch-on duration when the RF switch turns on, is considered for the proposed PMA-based hybrid precoder. Finally, simulation results have verified that, the PMA-based precoding can achieve higher spectral efficiency and energy efficiency when compared with the phase shifters based counterparts. More importantly, the proposed PMA-based hybrid precoder can significantly reduce the number of radio frequency chains, resulting in low energy consumption for its application in 5G green communication.