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
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TLDR
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.Abstract:
As a widely acknowledged efficient and green transportation model, rail traffic is expected to evolve into a new era of “smart rail mobility” whereby infrastructure, trains, and travelers will be interconnected to achieve optimized mobility, higher safety, and lower costs. Thus, a seamless high-data rate wireless connectivity with up to dozens of gigahertz bandwidth is required. Such a huge bandwidth requirement motivates the exploration of the underutilized millimeter (mm) wave and terahertz (THz) bands. 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. Ray-tracing simulations at 100 GHz imply that to form high-gain directional antenna beams, dynamic beamforming strategies and advanced handover design are critical for the feasibility of THz communications to enable smart rail mobility.read more
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Journal ArticleDOI
6G Wireless Systems: Vision, Requirements, Challenges, Insights, and Opportunities
Harsh Tataria,Mansoor Shafi,Andreas F. Molisch,Mischa Dohler,Henrik Sjöland,Fredrik Tufvesson +5 more
TL;DR: This work rigorously discusses the fundamental changes required in the core networks of the future, such as the redesign or significant reduction of the transport architecture that serves as a major source of latency for time-sensitive applications.
Journal ArticleDOI
Propagation Models and Performance Evaluation for 5G Millimeter-Wave Bands
TL;DR: Results show that the answers to channel performance metrics, such as spectrum efficiency, coverage, hardware/signal processing requirements, etc., are extremely sensitive to the choice of channel models.
Posted Content
White Paper on Broadband Connectivity in 6G
Nandana Rajatheva,Italo Atzeni,Emil Björnson,Andre Bourdoux,Stefano Buzzi,Jean-Baptiste Dore,Serhat Erkucuk,Manuel Fuentes,Ke Guan,Yuzhou Hu,Xiaojing Huang,Jari Hulkkonen,Josep Miquel Jornet,Marcos Katz,Rickard Nilsson,Erdal Panayirci,Khaled M. Rabie,Nuwanthika Rajapaksha,Mohammad Javad Salehi,Hadi Sarieddeen,Shahriar Shahabuddin,Tommy Svensson,Oskari Tervo,Antti Tolli,Qingqing Wu,Wen Xu +25 more
TL;DR: This white paper explores the road to implementing broadband connectivity in future 6G wireless systems, from extreme capacity with peak data rates up to 1 Tbps, to raising the typical data rates by orders-of-magnitude, to support broadband connectivity at railway speeds up to 1000 km/h.
Journal ArticleDOI
Analytical Performance Assessment of THz Wireless Systems
TL;DR: This paper is focused on providing the analytical framework for the quantification and evaluation of the joint effect of misalignment fading and hardware imperfections in the presence of multipath fading at terahertz (THz) wireless fiber extenders by providing novel closed-form expressions for the probability and cumulative density functions of the composite channel.
Journal ArticleDOI
An overview of terahertz antennas
TL;DR: A detailed overview of the most recent research on the performance improvement of the terahertz antennas is presented, including the latest research progress in THz photoconductive antennas, THz horn antennas,THz lens antennas, Thz microstrip antennas and THz on-chip antennas.
References
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Journal ArticleDOI
Millimeter Wave Mobile Communications for 5G Cellular: It Will Work!
Theodore S. Rappaport,Shu Sun,Rimma Mayzus,Hang Zhao,Yaniv Azar,Kevin H. Wang,George N. Wong,Jocelyn K. Schulz,Mathew K. Samimi,Felix Gutierrez +9 more
TL;DR: The motivation for new mm-wave cellular systems, methodology, and hardware for measurements are presented and a variety of measurement results are offered that show 28 and 38 GHz frequencies can be used when employing steerable directional antennas at base stations and mobile devices.
Journal ArticleDOI
Massive MIMO for next generation wireless systems
TL;DR: While massive MIMO renders many traditional research problems irrelevant, it uncovers entirely new problems that urgently need attention: the challenge of making many low-cost low-precision components that work effectively together, acquisition and synchronization for newly joined terminals, the exploitation of extra degrees of freedom provided by the excess of service antennas, reducing internal power consumption to achieve total energy efficiency reductions, and finding new deployment scenarios.
Journal ArticleDOI
Scaling Up MIMO: Opportunities and Challenges with Very Large Arrays
Fredrik Rusek,Daniel Persson,Buon Kiong Lau,Erik G. Larsson,Thomas L. Marzetta,Fredrik Tufvesson +5 more
TL;DR: The gains in multiuser systems are even more impressive, because such systems offer the possibility to transmit simultaneously to several users and the flexibility to select what users to schedule for reception at any given point in time.
Book
The scattering of electromagnetic waves from rough surfaces
Petr Beckmann,Andre Spizzichino +1 more
TL;DR: The scattering of electromagnetic waves from rough surfaces PDF is available at the online library of the University of Southern California as mentioned in this paper, where a complete collection of electromagnetic wave from rough surface books can be found.
Journal ArticleDOI
Spatially Sparse Precoding in Millimeter Wave MIMO Systems
TL;DR: This paper considers transmit precoding and receiver combining in mmWave systems with large antenna arrays and develops algorithms that accurately approximate optimal unconstrained precoders and combiners such that they can be implemented in low-cost RF hardware.