• Title/Summary/Keyword: terahertz (THz) communication

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Cooperative Nano Communication in the THz Gap Frequency Range using Wireless Power Transfer

  • Samarasekera, A. Chaminda J.;Shin, Hyundong
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.13 no.10
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    • pp.5035-5057
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    • 2019
  • Advancements in nanotechnology and novel nano materials in the past decade have provided a set of tools that can be used to design and manufacture integrated nano devices, which are capable of performing sensing, computing, data storing and actuation. In this paper, we have proposed cooperative nano communication using Power Switching Relay (PSR) Wireless Power Transfer (WPT) protocol and Time Switching Relay (TSR) WPT protocol over independent identically distributed (i.i.d.) Rayleigh fading channels in the Terahertz (THz) Gap frequency band to increase the range of transmission. Outage Probability (OP) performances for the proposed cooperative nano communication networks have been evaluated for the following scenarios: A) A single decode-and-forward (DF) relay for PSR protocol and TSR protocol, B) DF multi-relay network with best relay selection (BRS) for PSR protocol and TSR protocol, and C) DF multi-relay network with multiple DF hops with BRS for PSR protocol and TSR protocol. The results have shown that the transmission distance can be improved significantly by employing DF relays with WPT. They have also shown that by increasing the number of hops in a relay the OP performance is only marginally degraded. The analytical results have been verified by Monte-Carlo simulations.

Performance Analysis of Multi-Gigabit Wireless Transmission at THz WLAN-Type Applications

  • Choi, Yonghoon
    • Journal of Communications and Networks
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    • v.16 no.3
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    • pp.305-310
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    • 2014
  • Optimal position of access point (AP) is important for multi-gigabit wireless transmission in terahertz (THz) wireless local area network (WLAN)-type applications, where there exist the THz characteristic multiple clusters in channel propagation. By considering the multiple clusters in THz indoor communications, this paper investigates the optimal AP position when two APs are issued for increasing the system capacity. Numerical results reveal that the central position of each AP within each half service region, which offers the shortest cumulated path length for line-of-sight paths, is optimal to achieve the maximal system capacity.

Wireless Communication at 310 GHz using GaAs High-Electron-Mobility Transistors for Detection

  • Blin, Stephane;Tohme, Lucie;Coquillat, Dominique;Horiguchi, Shogo;Minamikata, Yusuke;Hisatake, Shintaro;Nouvel, Philippe;Cohen, Thomas;Penarier, Annick;Cano, Fabrice;Varani, Luca;Knap, Wojciech;Nagatsuma, Tadao
    • Journal of Communications and Networks
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    • v.15 no.6
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    • pp.559-568
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    • 2013
  • We report on the first error-free terahertz (THz) wireless communication at 0.310 THz for data rates up to 8.2 Gbps using a 18-GHz-bandwidth GaAs/AlGaAs field-effect transistor as a detector. This result demonstrates that low-cost commercially-available plasma-wave transistors whose cut-off frequency is far below THz frequencies can be employed in THz communication. Wireless communication over 50 cm is presented at 1.4 Gbps using a uni-travelling-carrier photodiode as a source. Transistor integration is detailed, as it is essential to avoid any deleterious signals that would prevent successful communication. We observed an improvement of the bit error rate with increasing input THz power, followed by a degradation at high input power. Such a degradation appears at lower powers if the photodiode bias is smaller. Higher-data-rate communication is demonstrated using a frequency-multiplied source thanks to higher output power. Bit-error-rate measurements at data rates up to 10 Gbps are performed for different input THz powers. As expected, bit error rates degrade as data rate increases. However, degraded communication is observed at some specific data rates. This effect is probably due to deleterious cavity effects and/or impedance mismatches. Using such a system, realtime uncompressed high-definition video signal is successfully and robustly transmitted.

Wireless Communication System on Very High Frequency (초고주파대역 무선통신시스템 기술 동향)

  • Jung, J.H.;Kim, M.D.;Lee, J.N.;Cho, Y.K.;Kim, K.S.;Kwon, H.K.;Song, Y.S.;Park, H.S.;Choi, E.Y.;Kim, J.S.;Kim, T.J.
    • Electronics and Telecommunications Trends
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    • v.34 no.6
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    • pp.28-41
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    • 2019
  • Future mobile services will require data transmission rates of 100 Gbps or higher due to the universalization of virtual and augmented reality devices. Therefore, THz technology, which uses an ultrahigh frequency band of 200 GHz or higher, is expected to be a candidate for such high-quality services. This article describes the current status of THz radio propagation characteristics, device and system developments, and network requirements to identify the overall trends in THz wireless communication technology.

Broadband and Polarization Independent Terahertz Metamaterial Filters Using Metal-Dielectric-Metal Complementary Ring Structure

  • Qi, Limei
    • Journal of the Optical Society of Korea
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    • v.20 no.2
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    • pp.263-268
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    • 2016
  • Broadband metal-dielectric-metal terahertz filters composed of complementary rings are designed and demonstrated. Four samples with different parameters were fabricated. Results measured using THz time-domain spectroscopy system show excellent agreement with simulations. Compared with the broadband filters reported before, the complementary ring structure in our design is insensitive to any polarization at normal incidence due to symmetry of the ring. Furthermore, the influence of structure parameters (such as period, radius, slot width, thickness and incidence angles) on the transmission characteristics has been investigated theoretically. The encouraging results afforded by designing of the filters could find applications in broadband sensors, terahertz communication systems, and other emerging terahertz technologies.

Analysis of Propagation Environments for Indoor Wireless Communication Systems at THz Frequencies (THz 실내 무선 통신시스템을 위한 전파환경 분석)

  • Lee, Won-Hui;Chung, Tae-Jin
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.10 no.2
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    • pp.1-6
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    • 2010
  • Short-range wireless communication systems are expanding at rapid rate, finding application in offices and homes. Development of wireless local network is accompanied by steady increase in the demand for ever higher data rates. This in turn entails the necessity to develop communication systems which operate at higher frequencies. It can be expected that short-rage wireless communication networks will soon push towards the THz frequency range. We use a 3D ray-launching for analysis of propagation environments at the indoor fixtures. We extended the approach from the modeling of the reflectivity of optically thick, smooth building materials at THz frequencies to materials with a rough surface. The simulation result of propagation environment is similar to average received power of reference paper. The RMS delay spread was calculated to be 9.11 ns in a room size of $6m(L){\times}5m(W){\times}2.5m(H)$ for the concrete plaster.

Laser-based THz Time-Domain Spectroscopy and Imaging Technology (레이저 기반 테라헤르츠 시간영역 분광 및 영상 기술)

  • Kang, Kwang-Yong;Kwon, Bong-Joon;Paek, Mun Cheol;Kang, Kyeong Kon;Cho, Suyoung;Kim, Jangsun;Lee, Senung-Churl;Lee, Dae-sung
    • Journal of Sensor Science and Technology
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    • v.27 no.5
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    • pp.317-327
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    • 2018
  • Terahertz (THz) time-domain spectroscopy(TDS), imaging techniques, and related systems have become mature technologies, widely used in many universities and research laboratories. However, the development of creative technologies still requires improved THz application systems. A few key points are discussed, including the innovative advances of mode-locking energy-emitting semiconductor lasers and better photoconductive semiconductor quantum structures. To realize a compact, low cost, and high performance THz system, it is essential that THz spectroscopy and imaging technologies are better characterized by semiconductor and nano-devices, both static and time-resolved. We introduce the THz spectroscopy and imaging systems, the OSCAT(Optical Sampling by laser CAvity Tuning) system and the ASOPS(ASynchronous Optical Sampling) system, are constructed by our research team. We report on the THz images obtained from their use.

Sixth-Generation Networks and Integrated Sensing and Communications (6G 통신에서의 센싱과 통신의 결합 서비스(ISAC))

  • D.M. Baek;T.Y. Kim
    • Electronics and Telecommunications Trends
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    • v.38 no.6
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    • pp.107-118
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    • 2023
  • Sixth-generation (6G) networks may allow to evolve from everything connected to everything sensed. Integrated sensing and communications (ISAC) requires the higher frequencies, wider bands, and more advanced antenna technology offered by 6G technology. We analyze advanced beamforming techniques to overcome the poor propagation characteristics of millimeter and terahertz waves as well as new waveforms designed to include sensing. This paper is intended to provide communication researchers with short summaries of ISAC, use cases, and standardization initiatives as guidelines for exploring new research and development directions.

Integrated RF Transceiver Technologies for Terahertz Communication System Applications (THz 통신 RF 송수신기 집적화 기술개발 동향)

  • Chung, T.J.;Lee, W.H.
    • Electronics and Telecommunications Trends
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    • v.25 no.4
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    • pp.93-102
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    • 2010
  • 최근 테라헤르츠 대역의 주파수를 이용하여 데이터 전송속도 10Gbps 이상의 초고속 통신 시스템에 대한 관심이 높아지고 있다. 테라헤르츠 대역의 주파수 범위는 100GHz~10THz로서 종래의 밀리미터파 대역에서 사용하고 있는 대역폭에 비하여 월등히 넓은 주파수 대역폭을 제공하여 주기 때문에 미래의 초고속 통신시스템 응용에 무한한 잠재적 가치를 가지고 있다. 테라헤르츠 전파는 전자파와 광파의 특성을 모두 가지고 있어 공간으로 전파하며 광의 특성에 따라 광학 렌즈를 이용하여 방사 빔을 집속할 수 있다. 또한 테라헤르츠파는 전파 감쇠가 대단히 커서 현재의 기술수준을 고려해 볼 때 10m 정도의 단거리 통신에 적합하다. 미국, 유럽, 일본 등 테라헤르츠 선도국에서는 핵심 부품 및 MMIC 등의 연구 개발에 많은 투자를 하고 있다. 본 고에서는 테라헤르츠 통신을 위한 집적화 RF 송수신기 기술개발 동향에 대하여 소개하고자 한다.

Terahertz Technologies for Short-Range Communication System Applications Utilizing Terahertz Carrier Frequency (데라헤르츠 대역의 주파수를 이용한 근거리 무선통신시스템 응용기술 동향)

  • Chung, T.J.;Lee, W.H.; Youn, D.Y.;Kim, J.H.
    • Electronics and Telecommunications Trends
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    • v.24 no.6
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    • pp.99-109
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    • 2009
  • 현재 주목을 받고 있는 테라헤르츠 대역의 주파수를 이용한 무선통신시스템 응용기술 동향에 대하여 기술한다. 테라헤르츠 대역은 전자파 스펙트럼에서 밀리미터파 대역과 원적외선 대역의 중간에 위치하는 100GHz~10THz 사이의 주파수이다. 현재 시점에서 10년 이내에 약 15Gbps의 데이터 속도가 필요할 것으로 판단되며, 10Gbps 이상의 전송속도를 실현하기 위해서는 기존의 밀리미터파에서 사용하는 주파수 대역폭 보다 더 넓은 대역폭이 필요하며, 이 대역폭을 얻기 위해서는 테라헤르츠 주파수 대역으로 자연적으로 옮겨가지 않을 수 없다. 본 고에서는 테라헤르츠 대역의 전파 특성, 가용 주파수 대역과 무선통신시스템 응용을 위한 옥내 채널 모델, 테라헤르츠 무선통신시스템 연구동향, RF 송수신기 핵심부품 및 MMIC 기술개발 동향을 소개하고자 한다.