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Terahertz-Band Integrated Sensing and Communications: Challenges and Opportunities [article]

Ahmet M. Elbir, Kumar Vijay Mishra, Symeon Chatzinotas, Mehdi Bennis
2022 arXiv   pre-print
These systems also provide research opportunities in developing novel methodologies for channel estimation, near-field beam split, waveform design and beam misalignment.  ...  The THz-band systems are also quickly merging as high-resolution sensing devices because of their ultra-wide bandwidth and very narrow beamwidth.  ...  channel modeling, etc. 1) Beam Split: In [8] , a true-time-delay (TTD) processing technique is developed for THz channel estimation in the presence of beam split, wherein a time delayer network is used  ... 
arXiv:2208.01235v1 fatcat:l7c7x4fl4far3j757gxu2gt62q

Intelligent Reflective Surfaces for Wireless Networks: An Overview of Applications, Approached Issues, and Open Problems

Darian Pérez-Adán, Óscar Fresnedo, José P. Gonzalez-Coma, Luis Castedo
2021 Electronics  
We also study the performance metrics and the setups considered in recent publications related to IRS and provide suggestions of future research lines based on still unexplored use cases in the state-of-the-art  ...  This technology introduces the notion of a smart propagation environment with the aim of improving the system performance.  ...  The work in [48] considers a wideband IRS-aided communication system under the beam squint effect.  ... 
doi:10.3390/electronics10192345 fatcat:n24ysswfrbe4vlu5kfhc5yopby

Intelligent reflecting surface enhanced wideband MIMO-OFDM communications: From practical model to reflection optimization [article]

Hongyu Li, Wenhao Cai, Yang Liu, Ming Li, Qian Liu, Qingqing Wu
2021 arXiv   pre-print
of the use of the practical model for the design of wideband systems.  ...  To address this issue, we first study the dual phase- and amplitude-squint effect of reflected signals and present a simplified practical IRS reflection model for wideband signals.  ...  Recently, the authors in [47] have focused on the channel estimation for practical IRSenhanced OFDM system.  ... 
arXiv:2007.14243v2 fatcat:ruomaxcuhbdlhisaq3f4nyd3km

2021 Index IEEE Transactions on Wireless Communications Vol. 20

2021 IEEE Transactions on Wireless Communications  
The Author Index contains the primary entry for each item, listed under the first author's name.  ...  Note that the item title is found only under the primary entry in the Author Index.  ...  ., +, TWC Dec. 2021 8381-8392 Wideband Channel Estimation for IRS-Aided Systems in the Face of Beam Squint.  ... 
doi:10.1109/twc.2021.3135649 fatcat:bgd3vzb7pbee7jp75dnbucihmq

Prospective Multiple Antenna Technologies for Beyond 5G [article]

Jiayi Zhang, Emil Björnson, Michail Matthaiou, Derrick Wing Kwan Ng, Hong Yang, David J. Love
2020 arXiv   pre-print
Now that multiple antenna technology has become a key component of the fifth-generation (5G) networks, it is time for the research community to look for new multiple antenna applications to meet the immensely  ...  Multiple antenna technologies have attracted large research interest for several decades and have gradually made their way into mainstream communication systems.  ...  To articulate the importance of beam squint, one can think of an OFDM system where each subcarrier will experience distinct AoAs for the same physical path, thereby making channel estimation and transceiver  ... 
arXiv:1910.00092v3 fatcat:guqhyhwrqzao5cofii7ck2wzs4

2021 Index IEEE Transactions on Vehicular Technology Vol. 70

2021 IEEE Transactions on Vehicular Technology  
The Author Index contains the primary entry for each item, listed under the first author's name.  ...  Note that the item title is found only under the primary entry in the Author Index.  ...  Metasurface Aided Wideband OFDM Commu-nications Against Beam Squint.  ... 
doi:10.1109/tvt.2022.3151213 fatcat:vzuzqu54irebpibzp3ykgy5nca

White Paper on Broadband Connectivity in 6G [article]

Nandana Rajatheva, Italo Atzeni, Emil Bjornson, Andre Bourdoux, Stefano Buzzi, Jean-Baptiste Dore, Serhat Erkucuk, Manuel Fuentes, Ke Guan, Yuzhou Hu, Xiaojing Huang, Jari Hulkkonen (+13 others)
2020 arXiv   pre-print
This white paper explores the road to implementing broadband connectivity in future 6G wireless systems.  ...  At the spectrum level, the network must seamlessly utilize sub-6 GHz bands for coverage and spatial multiplexing of many devices, while higher bands will be used for pushing the peak rates of point-to-point  ...  It is part of a series of twelve 6G white papers to be published in their final format in June 2020.  ... 
arXiv:2004.14247v1 fatcat:doom4rvlf5aafmtwpdxbyu6dke

Codebook Designs for Millimeter-Wave Communication Systems in Both Lowand High-Mobility: Achievements and Challenges

Semah Mabrouki, Iyad Dayoub, Qianrui Li, Marion Berbineau
2022 IEEE Access  
In this paper, we track the techniques of codebook-based beamforming for millimeter-wave communications in the context of the distinct requirements for low-mobility channel and high-mobility channel scenarios  ...  For 5G mobile and wireless networks, one of the challenges is to discover how to solve the dilemma between capacity requirements and spectrum shortage.  ...  Despite its great potential, IRS-aided beamforming faces new and unique challenges. In fact, IRS passive beamforming optimization highly depends on the available CSI.  ... 
doi:10.1109/access.2022.3154016 fatcat:7vn5vbevefc77imxvfgz4m7ki4

Pervasive Intelligent Endogenous 6G Wireless Systems: Prospects, Theories and Key Technologies

Yun Chen, Wenfeng Liu, Zhiang Niu, Zhongxiu Feng, Qiwei Hu, Tao Jiang
2020 Digital Communications and Networks  
The worldwide large-scale commercial deployment of 5G has commenced in 2020 for supporting enhanced Mobile BroadBand (eMBB), ultra-Reliable and Low-Latency Communications (uRLLC), and massive Machine-Type  ...  been spurring the industry and academia to dedicate their efforts to the research of future 6G wireless systems. 6G will be a disruptive, pervasive, intelligent, and endogenous wireless system, which  ...  channel sensing, estimation and feedback for reducing the system overhead.  ... 
doi:10.1016/j.dcan.2020.07.002 fatcat:pfo2oeb7tjeurhoqaqvhrzz3cq

Scoring the Terabit/s Goal:Broadband Connectivity in 6G [article]

Nandana Rajatheva, Italo Atzeni, Simon Bicais, Emil Bjornson, Andre Bourdoux, Stefano Buzzi, Carmen D'Andrea, Jean-Baptiste Dore, Serhat Erkucuk, Manuel Fuentes, Ke Guan, Yuzhou Hu (+17 others)
2021 arXiv   pre-print
This paper explores the road to vastly improving the broadband connectivity in future 6G wireless systems. Different categories of use cases are considered, with peak data rates up to 1 Tbps.  ...  At the spectrum level, the network must seamlessly utilize sub-6 GHz bands for coverage and spatial multiplexing of many devices, while higher bands will be mainly used for pushing the peak rates of point-to-point  ...  An anchorassisted two-phase channel estimation scheme is proposed in [193] , where two anchor nodes are deployed near the IRS for helping the BS to acquire the cascaded BS-IRS-user channels.  ... 
arXiv:2008.07220v2 fatcat:k4yyvxjguzeqtgewy4bxmnmuo4

Channel Estimation with Reconfigurable Intelligent Surfaces – A General Framework [article]

A. Lee Swindlehurst, Gui Zhou, Rang Liu, Cunhua Pan, Ming Li
2021 arXiv   pre-print
In this article, we examine channel estimation for RIS-based systems from a fundamental viewpoint.  ...  Optimally extracting the advantages available from reconfigurable intelligent surfaces (RISs) in wireless communications systems requires estimation of the channels to and from the RIS.  ...  For large arrays, ignoring the frequency dependence of the model leads to the beam-squint effect [22] .  ... 
arXiv:2110.00553v1 fatcat:xlgosurarfhddbze4ysyhzisgm

2019 Index IEEE Transactions on Geoscience and Remote Sensing Vol. 57

2019 IEEE Transactions on Geoscience and Remote Sensing  
., Insect Biological Parameter Estimation Based on the Invariant Target Parameters of the Scattering Matrix; TGRS Aug. 2019 6212-6225 Hu, C., see Zhang, M., TGRS Sept. 2019 6666-6674 Hu, C., Zhang,  ...  Polar Format Algorithm for Curvilinear Spotlight SAR Imaging on Arbitrary Region of Interest; TGRS Oct. 2019 7995-8010 Hu, T., see Kang, Z., TGRS Jan. 2019 181-193 Hu, T., Wu, Y., Zheng, G., Zhang,  ...  ., +, TGRS June 2019 3993-4004 Estimates of the Precipitation Top Heights in Convective Systems Using Microwave Radiances.  ... 
doi:10.1109/tgrs.2020.2967201 fatcat:kpfxoidv5bgcfo36zfsnxe4aj4

6G Wireless Systems: Vision, Requirements, Challenges, Insights, and Opportunities [article]

Harsh Tataria and Mansoor Shafi and Andreas F. Molisch and Mischa Dohler and Henrik Sjöland and Fredrik Tufvesson
2021 arXiv   pre-print
We rigorously discuss the fundamental changes required in the core networks of the future that serves as a major source of latency for time-sensitive applications.  ...  We present a holistic discussion of 6G systems beginning with lifestyle and societal changes driving the need for next generation networks.  ...  In 5G systems, pilot signals are transmitted, which are later used for channel estimation at the receiver.  ... 
arXiv:2008.03213v2 fatcat:whhsaotwszcjlfdx4nwc2qpj6y

The 2017 terahertz science and technology roadmap

S S Dhillon, M S Vitiello, E H Linfield, A G Davies, Matthias C Hoffmann, John Booske, Claudio Paoloni, M Gensch, P Weightman, G P Williams, E Castro-Camus, D R S Cumming (+34 others)
2017 Journal of Physics D: Applied Physics  
The aim of this roadmap is to present a snapshot of the present state of THz science and technology in 2017, and provide an opinion on the challenges and opportunities that the future holds.  ...  Following the development of laser based terahertz time-domain spectroscopy in the 1980s and 1990s the field of THz science and technology expanded rapidly, to the extent that it now touches many areas  ...  The challenge of supporting the large bandwidth for multi-Gbit/s links without beam squint will be significant. However, it will be an opportunity for beam steering capability and MIMO systems.  ... 
doi:10.1088/1361-6463/50/4/043001 fatcat:lkc3cvccvfgchmjs3432xtiqrq

Early reflection energy in concert halls: how much, how early, and from where

Anders Chr. Gade
2001 Journal of the Acoustical Society of America  
In this paper a single-input multi-output ͑SIMO͒ channel blind equalizer for an underwater acoustic communication system is considered.  ...  The system can be operated in a wide beam mode or used in a Mill's Cross mode to control the beamwidth in two dimensions.  ...  Am., Vol. 109, No. 5, Pt. 2, May 2001 141st Meeting: Acoustical Society of America The visual system processes images in terms of spatial frequencytuned channels.  ... 
doi:10.1121/1.4744078 fatcat:ido5s7awararfly27vq35s5sjy
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