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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Proceedings ArticleDOI
Terahertz (THz) wireless systems for space applications
TL;DR: The link analysis indicates that MGbps data rates are achievable with compact sized high gain antennas, and there is great potential for the NASA future high data wireless applications in environments with difficult cabling and size/weight constraints.
Journal ArticleDOI
Enhancement of spectral resolution and optical rejection ratio of Brillouin optical spectral analysis using polarization pulling
TL;DR: High-resolution, wide-bandwidth optical spectrum analysis is essential to the measuring and monitoring of advanced optical, millimeter-wave, and terahertz communication systems, sensing applications and device characterization.
Proceedings ArticleDOI
Performance Evaluation of THz Wireless Systems Operating in 275-400 GHz Band
Alexandros-Apostolos A. Boulogeorgos,Evangelos N. Papasotiriou,Joonas Kokkoniemi,Janne Lehtomaeki,Angeliki Alexiou,Markku Juntti +5 more
TL;DR: An appropriate system model for the terahertz (THz) wireless links in the range of 275 to 400 GHz is established, which accommodates the channel particularities and transceivers parameters.
Journal ArticleDOI
Energy Efficient Resource Allocation in Terahertz Downlink NOMA Systems
TL;DR: This paper introduces the downlink non-orthogonal multiple access (NOMA) technology into THz band small cell networks, where the total performance is optimized considering the two key enabling technologies.
Journal ArticleDOI
400-GHz Wireless Transmission of 60-Gb/s Nyquist-QPSK Signals Using UTC-PD and Heterodyne Mixer
Xianbin Yu,Rameez Asif,Molly Piels,Darko Zibar,Michael Galili,Toshio Morioka,Peter Uhd Jepsen,Leif Katsuo Oxenløwe +7 more
TL;DR: In this paper, an optical network compatible high-speed optoelectronics THz wireless transmission system operating at 400 GHz band is demonstrated, where optical Nyquist quadrature phase-shift keying signals in a 12.5-GHz ultradense wavelength-division multiplexing grid is converted to the THz radiation by photomixing in an antenna integrated unitravelling photodiode.
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Ho-Jin Song,Tadao Nagatsuma +1 more
TL;DR: The current progress of terahertz-wave technologies related to communications applications are examined and some issues that need to be considered for the future of THz communications are discussed.
Journal ArticleDOI
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John F. Federici,Lothar Moeller +1 more
TL;DR: The goal of this paper is to provide a comprehensive review of wireless sub-THz and THz communications and report on the reported advantages and challenges of using sub-terahertz andTHz waves as a means to transmit data wirelessly.
Journal ArticleDOI
Short-Range Ultra-Broadband Terahertz Communications: Concepts and Perspectives
R. Piesiewicz,Thomas Kleine-Ostmann,N. Krumbholz,Daniel M. Mittleman,Martin Koch,Joerg Schoebel,Thomas Kurner +6 more
TL;DR: It is demonstrated that a directed NLOS path scheme will make a terahertz communication system robust to shadowing, and it is shown that dielectric mirrors covering only parts of the walls will significantly enhance the signal coverage in a typical indoor scenario.