Wavefront Engineering: Realizing Efficient Terahertz Band Communications in 6G and Beyond
Wavefront Engineering: Realizing Efficient Terahertz Band Communications in 6G and Beyond
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DOI：
10.1109/mwc.019.2200583
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发表时间：
2023-05
影响因子：
12.9
通讯作者：
Arjun Singh;Vitaly Petrov;H. Guerboukha;I. Reddy;E. Knightly;D. Mittleman;J. Jornet
中科院分区：
文献类型：
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作者：
Arjun Singh;Vitaly Petrov;H. Guerboukha;I. Reddy;E. Knightly;D. Mittleman;J. Jornet
太赫兹（THz）频带通信被设想为未来无线标准的关键技术。随着硬件设计、信道模型和信号处理的进步，这一领域已经取得了实质性的进展。已经通过实验证明了在亚太赫兹频率下操作的高速率回程链路。然而，在蜂窝接入和无线局域网等广泛的通信系统中采用THz频段的下一个飞跃中存在固有的挑战。首先，这样的系统必须是：宽带，以保持所需的数据速率和传感分辨率;更重要的是，能够在克服传播损耗所需的高增益设备的大规模近场中工作。在这篇文章中，我们首先解释了为什么从较低的频率，包括毫米波的最先进的技术，不能简单地重新用于实现太赫兹波段通信系统。然后，我们提出了波前工程的愿景，以解决这些不足。此外，我们说明了如何新颖的实现特定的波前，如贝塞尔光束和艾里光束，提供有吸引力的优势，在创建太赫兹链接超过国家的最先进的远场波束成形和近场波束聚焦技术。文章最后讨论了新的问题和挑战，在这个新的和令人兴奋的研究领域。
Terahertz (THz) band communications is envisioned as a key technology for future wireless standards. Substantial progress has been made in this field, with advances in hardware design, channel models, and signal processing. High-rate backhaul links operating at sub-THz frequencies have been experimentally demonstrated. However, there are inherent challenges in making the next great leap for adopting the THz band in widespread communication systems, such as cellular access and wireless local area networks. Primarily, such systems have to be both: wideband, to maintain desired data rate and sensing resolution; and, more importantly, able to operate in the massive near field of the high-gain devices required to overcome the propagation losses. In this article, we first explain why the state-of-the-art techniques from lower frequencies, including millimeter-wave, cannot be simply repurposed to realize THz band communication systems. Then, we present a vision of wavefront engineering to address these shortfalls. Further, we illustrate how novel implementations of specific wavefronts, such as Bessel beams and Airy beams, offer attractive advantages in creating THz links over state-of-the-art far-field beamforming and near-field beamfocusing techniques. The article ends by discussing novel problems and challenges in this new and exciting research area.