Terahertz Communications and Sensing for 6G and Beyond: A Comprehensive Review
arxiv(2023)
摘要
Next-generation cellular technologies, commonly referred to as the 6G, are
envisioned to support a higher system capacity, better performance, and network
sensing capabilities. The THz band is one potential enabler to this end due to
the large unused frequency bands and the high spatial resolution enabled by the
short signal wavelength and large bandwidth. Different from earlier surveys,
this paper presents a comprehensive treatment and technology survey on THz
communications and sensing in terms of advantages, applications, propagation
characterization, channel modeling, measurement campaigns, antennas,
transceiver devices, beamforming, networking, the integration of communications
and sensing, and experimental testbeds. Starting from the motivation and use
cases, we survey the development and historical perspective of THz
communications and sensing with the anticipated 6G requirements. We explore the
radio propagation, channel modeling, and measurement for the THz band. The
transceiver requirements, architectures, technological challenges, and
state-of-the-art approaches to compensate for the high propagation losses,
including appropriate antenna design and beamforming solutions. We overview
several related technologies that either are required by or are beneficial for
THz systems and networks. The synergistic design of sensing and communications
is explored in depth. Practical trials, demonstrations, and experiments are
also summarized. The paper gives a holistic view of the current state of the
art and highlights the open research challenges towards 6G and beyond.
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