Journal ArticleDOI
Link Budget Analysis for Terahertz Fixed Wireless Links
TLDR
High data rates can only be transmitted via these links if transmitter and receiver antennas with very high gains are used, and this requires an adaptive control of mechanical fluctuations.Abstract:
Due to the broad bandwidths, terahertz (THz)-waves offer the possibility for wireless transmission of high data rates. Especially, broadband wireless access over short ranges and fixed wireless links based on THz-waves are very promising. They can be incorporated as a bridge for optical networks or an alternative for the connection of wireless stations in difficult environments, to transmit next generation HDTV signals or for the broadband connection of servers in a data center, for instance. The frequency range between 300 and 900 GHz is very promising for these applications since the possible bandwidth is very high and first electronic circuits will become available on the market soon. However, contrary to wireless links in the lower GHz-bands, the free-space path-loss is quite high and the attenuation due to molecules in the air or water droplets can significantly decrease the transmittable data rates in this frequency range. Here the basic properties of THz-waves will be investigated and the maximum achievable data rates for fixed wireless THz-links will be derived. In order to keep the considerations as general as possible, the derivations are based on simple assumptions and equations. Additionally, conclusions for the applicability of THz-waves for fixed wireless links with distances up to 1 km will be given and the special requirements for these systems will be discussed. As we will show, high data rates can only be transmitted via these links if transmitter and receiver antennas with very high gains are used. This requires an adaptive control of mechanical fluctuations.read more
Citations
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Journal ArticleDOI
Towards THz Communications - Status in Research, Standardization and Regulation
Thomas Kurner,Sebastian Priebe +1 more
TL;DR: An overview over THz communications is given, summarizing current research projects, spectrum regulations and ongoing standardization activities, and the technology enabling small integrated transceivers with highly directive, steerable antennas becomes the key challenges in face of the very high path losses.
Journal ArticleDOI
On Millimeter Wave and THz Mobile Radio Channel for Smart Rail Mobility
Ke Guan,Guangkai Li,Thomas Kurner,Andreas F. Molisch,Bile Peng,Ruisi He,Bing Hui,Junhyeong Kim,Zhangdui Zhong +8 more
TL;DR: In this paper, the motivations for developing millimeter wave and THz communications for railway are clarified by first defining the applications and scenarios required for smart rail mobility.
Journal ArticleDOI
Multi-Wideband Waveform Design for Distance-Adaptive Wireless Communications in the Terahertz Band
TL;DR: A multi-wideband waveform design for the THz band is proposed, by exploiting the channel peculiarities including the distance-varying spectral windows, the delay spread and the temporal broadening effects to maximize the communication distance while satisfying the rate and the transmit power constraints.
Posted Content
An Overview of Signal Processing Techniques for Terahertz Communications
TL;DR: This tutorial overviews classical problems of waveform design and modulation, beamforming and precoding, index modulation, channel estimation, channel coding, and data detection in THz transceiver systems and reconfigurable intelligent surfaces, which are vital to overcoming the distance problem at very high frequencies.
Journal ArticleDOI
Distance-Aware Bandwidth-Adaptive Resource Allocation for Wireless Systems in the Terahertz Band
Chong Han,Ian F. Akyildiz +1 more
TL;DR: The numerical results show that the developed resource allocation scheme improves the distances and exploitation of the THz spectrum significantly, and outperforms the existing millimeter-wave systems and the nonadaptive scheme.
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Proceedings Article
Graphene-based nano-antennas for electromagnetic nanocommunications in the terahertz band
TL;DR: In this article, a new quantum mechanical framework is used to analyze the properties of Carbon Nanotubes (CNTs) as nano-dipole antennas, and the results show that for a maximum antenna size in the order of several hundred nanometers (the expected maximum size for a nano-device), both a nano dipole and nano-patch antenna will be able to radiate electromagnetic waves in the terahertz band (0.1-10.0 THz).
Journal ArticleDOI
All Active MMIC-Based Wireless Communication at 220 GHz
Ingmar Kallfass,J. Antes,Thomas Schneider,F. Kurz,D. Lopez-Diaz,Sebastian Diebold,Hermann Massler,Arnulf Leuther,Axel Tessmann +8 more
TL;DR: The paper presents system considerations for wireless links in the 200-300-GHz range, discusses the design and performance of dedicated broadband transmit and receive MMICs, and presents link experiments.