论文标题
零效率的混合MMWave全双工MIMO系统的最大功率波束成形
Zero-Forcing Max-Power Beamforming for Hybrid mmWave Full-Duplex MIMO Systems
论文作者
论文摘要
由于有可能使光谱效率加倍，全双工（FD）系统受到了极大的关注。在5G技术的背景下，在毫米波（MMWave）运行的FD系统成为进一步提高光谱效率并降低潜伏期的最有希望的解决方案之一。但是，这种系统容易受到显着降低性能的自我干扰（SI）。为了克服这一缺点，已经开发出一种仅使用模拟的波束形成技术来减轻SI。由于巨大的功耗，在MMWave频率上运行的系统仅通过在保持恒定幅度的同时调整相位变速杆来进行功率。这样的硬件约束，称为恒定幅度（CA）约束，严重限制了系统性能。在这项工作中，我们提出了一种数字和模拟杂交波束形成设计，该设计完全消除了SI，同时实质上最小化了CA约束所施加的损失。此外，我们开发了完全数字的波束形成设计，并为频谱效率提供了上限，作为基准测试工具，以量化我们提出的杂种设计的损失。
Full-duplex (FD) systems gained enormous attention because of the potential to double the spectral efficiency. In the context of 5G technology, FD systems operating at millimeter-wave (mmWave) frequencies become one of the most promising solutions to further increase the spectral efficiency and reduce the latency. However, such systems are vulnerable to the self-interference (SI) that significantly degrades the performance. To overcome this shortcoming, analog-only beamforming techniques have been developed to mitigate the SI. Because of the huge power consumption, systems operating at mmWave frequencies beamform the power by only tunning the phase shifters while maintaining constant amplitudes. Such a hardware constraint, known as the constant amplitude (CA) constraint, severely limits the system performance. In this work, we propose a digital and analog hybrid beamforming design that completely eliminates the SI while substantially minimizing the losses imposed by the CA constraint. Further, we develop a fully-digital beamforming design and derive the upper bound for the spectral efficiency as benchmarking tools to quantify the losses of our proposed hybrid design.
