Terahertz Channel Propagation Phenomena, Measurement Techniques and Modeling for 6G Wireless Communication Applications: A Survey, Open Challenges and Future Research Directions

The Terahertz (THz) band (0.3-3.0 THz), spans a great portion of the Radio Frequency (RF) spectrum that is mostly unoccupied and unregulated. It is a potential candidate for application in Sixth-Generation (6G) wireless networks, as it has the capabilities of satisfying the high data rate and capaci...

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Bibliographic Details
Published in:IEEE Communications surveys and tutorials 2022-01, Vol.24 (4), p.1957-1996
Main Authors: Serghiou, Demos, Khalily, Mohsen, Brown, Tim W. C., Tafazolli, Rahim
Format: Article
Language:English
Subjects:
6G mobile communication
channel measurements
channel modeling
channel sounding
deterministic modeling
diffuse scattering
Measurement techniques
Modelling
molecular attenuation
NOMA
Phased arrays
Propagation
Quantum cascade lasers
Radio frequency
radio frequency (RF)
Spectroscopy
statistical modeling
stochastic modeling
Systems design
terahertz (THz)
Terahertz frequencies
Wireless communication
Wireless communication systems
Wireless communications
Wireless networks
Wireless sensor networks
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Summary:The Terahertz (THz) band (0.3-3.0 THz), spans a great portion of the Radio Frequency (RF) spectrum that is mostly unoccupied and unregulated. It is a potential candidate for application in Sixth-Generation (6G) wireless networks, as it has the capabilities of satisfying the high data rate and capacity requirements of future wireless communication systems. Profound knowledge of the propagation channel is crucial in communication systems design, which nonetheless is still at its infancy, as channel modeling at THz frequencies has been mostly limited to characterizing fixed Point-to-Point (PtP) scenarios up to 300 GHz. Provided the technology matures enough and models adapt to the distinctive characteristics of the THz wave, future wireless communication systems will enable a plethora of new use cases and applications to be realized, in addition to delivering higher spectral efficiencies that would ultimately enhance the Quality-of-Service (QoS) to the end user. In this paper, we provide an insight into THz channel propagation characteristics, measurement capabilities, and modeling techniques for 6G communication applications, along with guidelines and recommendations that will aid future characterization efforts in the THz band. We survey the most recent and important measurement campaigns and modeling efforts found in literature, based on the use cases and system requirements identified. Finally, we discuss the challenges and limitations of measurement and modeling at such high frequencies and contemplate the future research outlook toward realizing the 6G vision.
ISSN:1553-877X
1553-877X
2373-745X
DOI:10.1109/COMST.2022.3205505