论文标题
节能动态 - 套件，带有固定的True-tire-delay设计，用于Terahertz宽带混合边界
Energy-efficient Dynamic-subarray with Fixed True-time-delay Design for Terahertz Wideband Hybrid Beamforming
论文作者
论文摘要
Terahertz（THZ）超质量多输入多输出（UM-MIMO）系统的混合波束形成是6G空间空气地面集成网络的有前途的技术，该技术可以克服巨大的传播损失并提供前所未有的数据速率。在THZ带中的超大带宽和超大级天线阵列中，梁斜线成为关键问题之一，可以减少阵列增益并大大降低数据速率。但是，由于相位变速器的频率 - 盘属性，传统的基于相位变速器的混合波束形成架构无法解决此问题。在本文中，为了在保持高能效率的同时对抗梁的斜视，提出了一种具有固定的True-tire-delay（DS-FTTD）架构的新型动态式架子。与使用复杂的可调节TTD的现有研究相比，由于低成本的FTTD，DS-FTTD体系结构具有较低的功耗和硬件复杂性。此外，提出了一种低复杂行分解（RD）算法来设计DS-FTTD架构的混合光束矩阵。广泛的仿真结果表明，通过使用RD算法，DS-FTTD体系结构可实现接近最佳的阵列增益，并且能源效率明显高于现有体系结构。此外，使用RD算法的DS-FTTD体系结构的光谱效率对于不完美的通道状态信息是可靠的。
Hybrid beamforming for Terahertz (THz) ultra-massive multiple-input multiple-output (UM-MIMO) systems is a promising technology for 6G space-air-ground integrated networks, which can overcome huge propagation loss and offer unprecedented data rates. With ultra-wide bandwidth and ultra-large-scale antennas array in THz band, the beam squint becomes one of the critical problems which could reduce the array gain and degrade the data rate substantially. However, the traditional phase-shifters-based hybrid beamforming architectures cannot tackle this issue due to the frequency-flat property of the phase shifters. In this paper, to combat the beam squint while keeping high energy efficiency, a novel dynamic-subarray with fixed true-time-delay (DS-FTTD) architecture is proposed. Compared to the existing studies which use the complicated adjustable TTDs, the DS-FTTD architecture has lower power consumption and hardware complexity, thanks to the low-cost FTTDs. Furthermore, a low-complexity row-decomposition (RD) algorithm is proposed to design hybrid beamforming matrices for the DS-FTTD architecture. Extensive simulation results show that, by using the RD algorithm, the DS-FTTD architecture achieves near-optimal array gain and significantly higher energy efficiency than the existing architectures. Moreover, the spectral efficiency of DS-FTTD architecture with the RD algorithm is robust to the imperfect channel state information.
