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A Survey on Terahertz Communications 认领 引用 被引量：98
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作者 Zhi Chen Xinying Ma +6 位作者 Bo Zhang Yaxin Zhang Zhongqian Niu Ningyuan Kuang Wenjie Chen Lingxiang Li Shaoqian Li 《China Communications》 SCIE CSCD 2019年第2期1-35,共35页
With the exponential growth of the data traffic in wireless communication systems, terahertz(THz) frequency band is envisioned as a promising candidate to support ultra-broadband for future beyond fifth generation(5G)... With the exponential growth of the data traffic in wireless communication systems, terahertz(THz) frequency band is envisioned as a promising candidate to support ultra-broadband for future beyond fifth generation(5G), bridging the gap between millimeter wave(mmWave) and optical frequency ranges. The purpose of this paper is to provide a comprehensive literature review on the development towards THz communications and presents some key technologies faced in THz wireless communication systems. Firstly, despite the substantial hardware problems that have to be developed in terms of the THz solid state superheterodyne receiver, high speed THz modulators and THz antennas, the practical THz channel model and the efficient THz beamforming are also described to compensate for the severe path attenuation. Moreover, two different kinds of lab-level THz communication systems are introduced minutely, named a solid state THz communication system and a spatial direct modulation THz communication system, respectively. The solid state THz system converts intermediate frequency(IF) modulated signal to THz frequency while the direct modulation THz system allows the high power THz sources to input for approving the relatively long distance communications. Finally, we discuss several potential application scenarios as well as some vital technical challenges that will be encountered in the future THz communications. 展开更多
关键词 Terahertz(THz)communications beyond fifth generation(5G) superheterodyne receiver modulators antennas channel model beamforming technical challenges
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Towards Intelligent Reflecting Surface Empowered 6G Terahertz Communications: A Survey 认领 引用 被引量：12
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作者 Zhi Chen Xinying Ma +1 位作者 Chong Han Qiye Wen 《China Communications》 SCIE EI CSCD 2021年第5期93-119,共27页
Terahertz(THz)communications have been widely envisioned as a promising enabler to provide adequate bandwidth and achieve ultra-high data rates for sixth generation(6G)wireless networks.In order to mitigate blockage v... Terahertz(THz)communications have been widely envisioned as a promising enabler to provide adequate bandwidth and achieve ultra-high data rates for sixth generation(6G)wireless networks.In order to mitigate blockage vulnerability caused by serious propagation attenuation and poor diffraction of THz waves,an intelligent reflecting surface(IRS),which manipulates the propagation of incident electromagnetic waves in a programmable manner by adjusting the phase shifts of passive reflecting elements,is proposed to create smart radio environments,improve spectrum efficiency and enhance coverage capability.Firstly,some prospective application scenarios driven by the IRS empowered THz communications are introduced,including wireless mobile communications,secure communications,unmanned aerial vehicle(UAV)scenario,mobile edge computing(MEC)scenario and THz localization scenario.Then,we discuss the enabling technologies employed by the IRS empowered THz system,involving hardware design,channel estimation,capacity optimization,beam control,resource allocation and robustness design.Moreover,the arising challenges and open problems encountered in the future IRS empowered THz communications are also highlighted.Concretely,these emerging problems possibly originate from channel modeling,new material exploration,experimental IRS testbeds and intensive deployment.Ultimately,the combination of THz communications and IRS is capable of accelerating the development of 6G wireless networks. 展开更多
关键词 terahertz(THz)communications intelligent reflecting surface(IRS) sixth generation(6G) application scenarios enabling technologies emerging challenges.
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A Dual-Broadband Liquid-Crystal Programmable Metasurface and Its Application in Terahertz Wireless Communications 认领 引用
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作者 Yuan Fu Yuanbo Li +8 位作者 Xiaojian Fu Lu Xu Yujie Liu Qun Yan Zhou Jun Yang Chong Han Jun Yan Dai Qiang Cheng Tie Jun Cui 《Engineering》 SCIE EI CSCD 2026年第4期352-363,共12页
Terahertz communication technology is envisioned as a promising candidate for the pivotal spectrum technology in future wireless communication networks.However,the limited penetration ability of terahertz waves makes ... Terahertz communication technology is envisioned as a promising candidate for the pivotal spectrum technology in future wireless communication networks.However,the limited penetration ability of terahertz waves makes line-of-sight(LoS)transmission indispensable,hindering the extensive application of terahertz communications.In this work,a novel liquid-crystal programmable metasurface(LCPM)is proposed for the first time,which can effectively achieve dual-broadband beam manipulation to improve link stability and extend coverage for terahertz communications in non-line-of-sight(NLoS)scenarios.The LCPM is operated in both the W band that covers 94 GHz and the D band that covers 140 GHz,corresponding to x-polarized and y-polarized wave incidence,respectively.Based on the proposed LCPM,realistic NLoS terahertz communication links are established and showcased.Communication measurements substantiate that the LCPM is capable of realizing extensive dynamic channel regulations and long-distance communications across both bands in various modulation schemes,supporting real-time high-speed video transmission.The experimental results validate the feasibility of employing the LCPM for terahertz wireless communications,paving the way for developing and implementing ubiquitous terahertz communication networks even with LoS blockage. 展开更多
关键词 Programmable metasurface Terahertz communication Reconfigurable intelligent surface Dual-frequency Broadband Beamforming
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AI and Deep Learning for Terahertz Ultra-Massive MIMO:From Model-Driven Approaches to Foundation Models 认领 引用 被引量：1
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作者 Wentao Yu Hengtao He +4 位作者 Shenghui Song Jun Zhang Linglong Dai Lizhong Zheng Khaled B.Letaief 《Engineering》 SCIE EI CSCD 2026年第1期14-33,共20页
This study explored the transformative potential of artificial intelligence(AI)in addressing the challenges posed by terahertz ultra-massive multiple-input multiple-output(UM-MIMO)systems.It begins by outlining the ch... This study explored the transformative potential of artificial intelligence(AI)in addressing the challenges posed by terahertz ultra-massive multiple-input multiple-output(UM-MIMO)systems.It begins by outlining the characteristics of terahertz UM-MIMO systems and identifies three primary challenges for transceiver design:computational complexity,modeling difficulty,and measurement limitations.The study posits that AI provides a promising solution to these challenges.Three systematic research roadmaps are proposed for developing AI algorithms tailored to terahertz UM-MIMO systems.The first roadmap,model-driven deep learning(DL),emphasizes the importance of leveraging available domain knowledge and advocates the adoption of AI only to enhance bottleneck modules within an established signal processing or optimization framework.Four essential steps are discussed:algorithmic frameworks,basis algorithms,loss function design,and neural architecture design.The second roadmap presents channel state information(CSI)foundation models,aimed at unifying the design of different transceiver modules by focusing on their shared foundation,that is,the wireless channel.The training of a single compact foundation model is proposed to estimate the score function of wireless channels,which serve as a versatile prior for designing a wide variety of transceiver modules.Four essential steps are outlined:general frameworks,conditioning,site-specific adaptation,and the joint design of CSI foundation models and model-driven DL.The third roadmap aims to explore potential directions for applying pretrained large language models(LLMs)to terahertz UM-MIMO systems.Several application scenarios are envisioned,including LLM-based estimation,optimization,search,network management,and protocol understanding.Finally,the study highlights open problems and future research directions. 展开更多
关键词 Terahertz communications Ultra-massive multiple-input multiple-output Model-driven deep learning Foundation models Large language models
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Pixelated liquid crystal programmable metasurface enabled multi-functional terahertz near-field wavefront manipulation 认领 引用
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作者 YUAN FU XIAOJIAN FU +4 位作者 LIFENG CHEN PENG WANG LIHAO HUANG JUN YANG TIE JUN CUI 《Photonics Research》 SCIE EI CAS CSCD 2026年第5期2068-2079,共12页
Reconfigurable intelligent surface(RIS)technology is believed to effectively solve the dilemma of terahertz wireless communication in non-line-of-sight scenarios.Notably,the deployment of large-scale RIS arrays at hig... Reconfigurable intelligent surface(RIS)technology is believed to effectively solve the dilemma of terahertz wireless communication in non-line-of-sight scenarios.Notably,the deployment of large-scale RIS arrays at high frequencies brings about significant near-field effects,resulting in extensive near-field areas,which provides the possibility for the application of near-field communication.In this paper,a pixelated liquid crystal program-mable metasurface(PLCPM)is proposed to effectively manipulate terahertz waves in the near-field region.Leveraging the tunability of liquid crystal(LC)materials,the proposed PLCPM achieves 1-bit phase coding capability within the 104-110 GHz frequency band. 展开更多
关键词 multi functional terahertz near field wavefront manipulation manipulate terahertz terahertz wireless communication reconfigurable intelligent surface pixelated liquid crystal programmable metasurface non line sight scenarios near field communication reconfigurable intelligent surface ris technology
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Cooperative Beam Selection for RIS-Aided Terahertz MIMO Networks via Multi-Task Learning 认领 引用
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作者 Ma Xinying Chen Gong Wang Xiaofei 《China Communications》 SCIE EI CSCD 2026年第2期211-227,共17页
Reconfigurable intelligent surface(RIS)have been cast as a promising alternative to alleviate blockage vulnerability and enhance coverage capability for terahertz(THz)communications.Owing to large-scale array elements... Reconfigurable intelligent surface(RIS)have been cast as a promising alternative to alleviate blockage vulnerability and enhance coverage capability for terahertz(THz)communications.Owing to large-scale array elements at transceivers and RIS,the codebook based beamforming can be utilized in a computationally efficient manner.However,the codeword selection for analog beamforming is an intractable combinatorial optimization(CO)problem.To this end,by taking the CO problem as a classification problem,a multi-task learning based analog beam selection(MTL-ABS)framework is developed to implement cooperative beam selection concurrently at transceivers and RIS.In addition,residual network and self-attention mechanism are used to combat the network degradation and mine intrinsic THz channel features.Finally,the network convergence is analyzed from a blockwise perspective,and numerical results demonstrate that the MTL-ABS framework greatly decreases the beam selection overhead and achieves near optimal sum-rate compared with heuristic search based counterparts. 展开更多
关键词 beam selection multi-task learning reconfigurable intelligent surface(RIS) terahertz(THz)communications
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MIMO-Terahertz in 6G Nano-Communications:Channel Modeling and Analysis 认领 引用 被引量：14
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作者 Shahid Bashir Mohammed H.Alsharif +4 位作者 Imran Khan Mahmoud A.Albreem Aduwati Sali Borhanuddin Mohd Ali Wonjong Noh 《Computers, Materials & Continua》 SCIE EI 2021年第1期263-274,共12页
With the development of wireless mobile communication technology,the demand for wireless communication rate and frequency increases year by year.Existing wireless mobile communication frequency tends to be saturated,w... With the development of wireless mobile communication technology,the demand for wireless communication rate and frequency increases year by year.Existing wireless mobile communication frequency tends to be saturated,which demands for new solutions.Terahertz(THz)communication has great potential for the future mobile communications(Beyond 5G),and is also an important technique for the high data rate transmission in spatial information network.THz communication has great application prospects in military-civilian integration and coordinated development.In China,important breakthroughs have been achieved for the key techniques of THz high data rate communications,which is practically keeping up with the most advanced technological level in the world.Therefore,further intensifying efforts on the development of THz communication have the strategic importance for China in leading the development of future wireless communication techniques and the standardization process of Beyond 5G.This paper analyzes the performance of the MIMO channel in the Terahertz(THz)band and a discrete mathematical method is used to propose a novel channel model.Then,a channel capacity model is proposed by the combination of path loss and molecular absorption in the THz band based on the CSI at the receiver.Simulation results show that the integration of MIMO in the THz band gives better data rate and channel capacity as compared with a single channel. 展开更多
关键词 Wireless communication 6G mobile communication terahertz communication MIMO channel modeling
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Terahertz Band: Lighting up Next-Generation Wireless Communications 认领 引用 被引量：5
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作者 Hongqi Zhang Lu Zhang Xianbin Yu 《China Communications》 SCIE EI CSCD 2021年第5期153-174,共22页
With the explosion of wireless data rates,the terahertz(THz)band(0.1–10 THz)is envisioned as a promising candidate to break the existing bandwidth bottleneck and satisfy the ever-increasing capacity demand.The THz wi... With the explosion of wireless data rates,the terahertz(THz)band(0.1–10 THz)is envisioned as a promising candidate to break the existing bandwidth bottleneck and satisfy the ever-increasing capacity demand.The THz wireless communications feature a number of attractive properties,such as potential terabit-per-second capacity and high energy efficiency.In this paper,an overview on the state-of-the-art THz communications is studied,with a special focus on key technologies of THz transceivers and THz communication systems.The recent progress on both electronic and photonic THz transmitters are presented,and then the THz receivers operating in direct-and heterodyne reception modes are individually surveyed.Based on the THz transceiver schemes,three kinds of THz wireless communication systems are reviewed,including solid-state electronic systems,photonics-assisted systems and all-photonics systems.The prospective key enabling technologies,corresponding challenges and research directions for lighting up high-speed THz communication systems are discussed as well. 展开更多
关键词 terahertz communication 6th-generation terahertz photonics terahertz transceivers terahertz waves
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Hybrid Precoding for Cluster-Based Multi-Carrier Beam Division Multiple Access in Terahertz Wireless Communications 认领 引用 被引量：1
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作者 Hang Yuan Xiang Wang +1 位作者 Kai Yang Jianping An 《China Communications》 SCIE EI CSCD 2021年第5期81-92,共12页
Terahertz(THz)wireless communication has the capability to connect massive devices using its ultra-large spectrum resource.We propose a hybrid precoding scheme for the cluster-based multi-carrier beam division multipl... Terahertz(THz)wireless communication has the capability to connect massive devices using its ultra-large spectrum resource.We propose a hybrid precoding scheme for the cluster-based multi-carrier beam division multiple access(MC-BDMA)to enable THz massive connections.Both the inter-beam interference and inter-band power leakage in this system are considered.A mathematical model is established to analyze and reduce their effects on the THz signal transmission.By considering the peculiarities of THz channels and characteristics of THz hardware components,we further propose a three-step hybrid precoding algorithm with low complexity,where the received signal power enhancement,the inter-beam interference elimination,and the inter-band power leakage suppression are conducted in succession.Simulation results are presented to demonstrate the high spectrum efficiency and high energy efficiency of our proposed algorithm,especially in the massive-connection scenarios. 展开更多
关键词 terahertz wireless communications multicarrier hybrid precoding power leakage suppression
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Autoencoder with Fitting Network for Terahertz Wireless Communications:A Deep Learning Approach 认领 引用
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作者 Zhaohui Huang Dongxuan He +2 位作者 Jiaxuan Chen Zhaocheng Wang Sheng Chen 《China Communications》 SCIE CSCD 2022年第3期172-180,共9页
Terahertz wireless communication has been regarded as an emerging technology to satisfy the ever-increasing demand of ultra-high-speed wireless communications.However,affected by the imperfections of cheap and energy-... Terahertz wireless communication has been regarded as an emerging technology to satisfy the ever-increasing demand of ultra-high-speed wireless communications.However,affected by the imperfections of cheap and energy-efficient Terahertz devices,Terahertz signals suffer from serve hybrid distortions,including in-phase/quadrature imbalance,phase noise and nonlinearity,which degrade the demodulation performance significantly.To improve the robustness against these hybrid distortions,an improved autoencoder is proposed,which includes coding the transmitted symbols at the transmitter and decoding the corresponding signals at the receiver.Moreover,due to the lack of information of Terahertz channel during the training of the autoencoder,a fitting network is proposed to approximate the characteristics of Terahertz channel,which provides an approximation of the gradients of loss.Simulation results show that our proposed autoencoder with fitting network can recover the transmitted symbols under serious hybrid distortions,and improves the demodulation performance significantly. 展开更多
关键词 Terahertz wireless communication hybrid distortion signal demodulation autoencoder
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Toward 6G Communication Networks:Terahertz Frequency Challenges and Open Research Issues 认领 引用 被引量：2
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作者 Mohammed H.Alsharif Mahmoud A.M Albreem +1 位作者 Ahmad A.A Solyman Sunghwan Kim 《Computers, Materials & Continua》 SCIE EI 2021年第3期2831-2842,共12页
Future networks communication scenarios by the 2030s will include notable applications are three-dimensional(3D)calls,haptics communications,unmanned mobility,tele-operated driving,bio-internet of things,and the Nanoi... Future networks communication scenarios by the 2030s will include notable applications are three-dimensional(3D)calls,haptics communications,unmanned mobility,tele-operated driving,bio-internet of things,and the Nanointernet of things.Unlike the current scenario in which megahertz bandwidth are sufficient to drive the audio and video components of user applications,the future networks of the 2030s will require bandwidths in several gigahertzes(GHz)(from tens of gigahertz to 1 terahertz[THz])to perform optimally.Based on the current radio frequency allocation chart,it is not possible to obtain such a wide contiguous radio spectrum below 90 GHz(0.09 THz).Interestingly,these contiguous blocks of radio spectrum are readily available in the higher electromagnetic spectrum,specifically in the Terahertz(THz)frequency band.The major contribution of this study is discussing the substantial issues and key features of THz waves,which include(i)key features and significance of THz frequency;(ii)recent regulatory;(iii)the most promising applications;and(iv)possible open research issues.These research topics were deeply investigated with the aim of providing a specific,synopsis,and encompassing conclusion.Thus,this article will be as a catalyst towards exploring new frontiers for future networks of the 2030s. 展开更多
关键词 Wireless networks beyond 5G 6G communications terahertz waves terahertz frequency terahertz communications
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A 3-D Hybrid Dynamic Channel Model for Indoor THz Communications 认领 引用 被引量：7
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作者 Yan Zhang Lei Zhao Zunwen He 《China Communications》 SCIE EI CSCD 2021年第5期50-65,共16页
To meet the demands for the explosive growth of mobile data rates and scarcity of spectrum resources in the near future,the terahertz(THz)band has widely been regarded as a key enabler for the upcoming beyond fifth-ge... To meet the demands for the explosive growth of mobile data rates and scarcity of spectrum resources in the near future,the terahertz(THz)band has widely been regarded as a key enabler for the upcoming beyond fifth-generation(B5G)wireless communications.An accurate THz channel model is crucial for the design and deployment of the THz wireless communication systems.In this paper,a three-dimensional(3-D)dynamic indoor THz channel model is proposed by means of combining deterministic and stochastic modeling approaches.Clusters are randomly distributed in the indoor environment and each ray is characterized with consideration of molecular absorption and diffuse scattering.Moreover,we present the dynamic generation procedure of the channel impulse responses(CIRs).Statistical properties are investigated to indicate the non-stationarity and feasibility of the proposed model.Finally,by comparing with delay spread and K-factor results from the measurements,the utility of the proposed channel model is verified. 展开更多
关键词 terahertz(THz)communications indoor channel molecular absorption diffuse scattering non-stationarity
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Performance comparison of single-carrier and multi-carrier waveforms over terahertz wireless channels 认领 引用
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作者 Dongxuan He Zhi Zhang +3 位作者 Hao Lin Zuomin Wu Yingpei Huang Zhaocheng Wang 《Digital Communications and Networks》 SCIE CSCD 2024年第5期1297-1304,共8页
Terahertz(THz)wireless communication has been recognized as a powerful technology to meet the everincreasing demand of ultra-high rate services.In order to achieve efficient and reliable wireless communications over T... Terahertz(THz)wireless communication has been recognized as a powerful technology to meet the everincreasing demand of ultra-high rate services.In order to achieve efficient and reliable wireless communications over THz bands,it is extremely necessary to find an appropriate waveform for THz communications.In this paper,performance comparison of various single-carrier and multi-carrier waveforms over THz channels will be provided.Specifically,first,a system model for terahertz communication is briefly described,which includes amplifier nonlinearity,propagation characteristic,phase noise,etc.Then,the transceiver architectures related to both single-carrier and multi-carrier waveforms are presented,as well as their corresponding signal processing techniques.To evaluate the suitability of the waveforms,key performance metrics concerning power efficiency,transmission performance,and computational complexity are provided.Simulation results are provided to compare and validate the performance of different waveforms,which demonstrate the outstanding performance of Discrete-Fourier-Transform spread Orthogonal Frequency Division Multiplexing(DFT-s-OFDM)to THz communications when compared to Cyclic Prefix-OFDM(CP-OFDM)and other single-carrier waveforms. 展开更多
关键词 Terahertz communication RF imperfection Single-carrier waveform Multi-carrier waveform
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Reliable and Energy-Aware Job Offloading at Terahertz Frequencies for Mobile Edge Computing 认领 引用 被引量：2
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作者 Sha Xie Haoran Li +2 位作者 Lingxiang Li Zhi Chen Shaoqian Li 《China Communications》 SCIE CSCD 2020年第12期17-36,共20页
In this paper,we co-design the transmission power and the offloading strategy for job offloading to a mobile edge computing(MEC)server at Terahertz(THz)frequencies.The goal is to minimize the communication energy cons... In this paper,we co-design the transmission power and the offloading strategy for job offloading to a mobile edge computing(MEC)server at Terahertz(THz)frequencies.The goal is to minimize the communication energy consumption while providing ultra-reliable low end-to-end latency(URLLC)services.To that end,we first establish a novel reliability framework,where the end-to-end(E2E)delay equals a weighted sum of the local computing delay,the communication delay and the edge computing delay,and the reliability is defined as the probability that the E2E delay remains below a certain pre-defined threshold.This reliability gives a full view of the statistics of the E2E delay,thus constituting advancement over prior works that have considered only average delays.Based on this framework,we establish the communication energy consumption minimization problem under URLLC constraints.This optimization problem is non-convex.To handle that issue,we first consider the special single-user case,where we derive the optimal solution by analyzing the structure of the optimization problem.Further,based on the analytical result for the single-user case,we decouple the optimization problem for multi-user scenarios into several sub-optimization problems and propose a sub-optimal algorithm to solve it.Numerical results verify the performance of the proposed algorithm. 展开更多
关键词 Terahertz(THz)communications mobile edge computing(MEC) ultra-reliable low end-to-end latency(URLLC)services green communications
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Photonics-aided 240-Gbit/s terahertz transmission over 200-m 2×2 MIMO links at 300 GHz enabled by non-uniform signaling and CMMA-NAG equalization 认领 引用
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作者 Zhigang Xin Jiao Zhang +10 位作者 Min Zhu Weidong Tong Qing Zhong Junhao Zhang Yuancheng Cai Bingchang Hua Mingzheng Lei Junjie Ding Xingyu Chen Yunwu Wang Long Zhang 《Chinese Optics Letters》 SCIE EI CAS CSCD 2026年第3期206-210,共5页
This work demonstrates a photonics-aided 2×2 multiple-input multiple-output(MIMO)terahertz(THz)wireless communication system operating at 300 GHz,achieving a data rate of 240 Gbit/s over a 200-m outdoor link.To o... This work demonstrates a photonics-aided 2×2 multiple-input multiple-output(MIMO)terahertz(THz)wireless communication system operating at 300 GHz,achieving a data rate of 240 Gbit/s over a 200-m outdoor link.To overcome nonlinear distortion and improve spectral efficiency,non-uniform signaling is employed to optimize constellation shaping.A novel,to our knowledge,cascaded multi-module algorithm with a Nesterov accelerated gradient(CMMA-NAG)equalizer is proposed to enhance convergence speed and equalization performance.Experimental results show effective suppression of nonlinear effects and inter-channel interference,enabling high-quality recovery of coherent polarization-division multiplexed signals.This work offers significant advancements toward high-capacity,reliable THz wireless links for next-generation 6G communication networks. 展开更多
关键词 photonics-aided terahertz communication non-uniform signaling CMMA-NAG equalization
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Milestones of Wireless Communication Networks and Technology Prospect of Next Generation(6G) 认领 引用 被引量：2
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作者 Mohammed H.Alsharif Md.Sanwar Hossain +3 位作者 Abu Jahid Muhammad Asghar Khan Bong Jun Choi Samih M.Mostafa 《Computers, Materials & Continua》 SCIE EI 2022年第6期4803-4818,共16页
Since around 1980,a new generation of wireless technology has arisen approximately every 10 years.First-generation(1G)and secondgeneration(2G)began with voice and eventually introduced more and more data in third-gene... Since around 1980,a new generation of wireless technology has arisen approximately every 10 years.First-generation(1G)and secondgeneration(2G)began with voice and eventually introduced more and more data in third-generation(3G)and became highly popular in the fourthgeneration(4G).To increase the data rate along with low latency and mass connectivity the fifth-generation(5G)networks are being installed from 2020.However,the 5G technology will not be able to fulfill the data demand at the end of this decade.Therefore,it is expected that 6G communication networks will rise,providing better services through the implementation of new enabling technologies and allowing users to connect everywhere.6G technology would not be confined to cellular communications networks,but would also comply with non-terrestrial communication system requirements,such as satellite communication.The ultimate objectives of this work are to address the major challenges of the evolution of cellular communication networks and to discourse the recent growth of the industry based on the key scopes of application and challenges.The main areas of research topics are summarized into(i)major 6G wireless networkmilestones;(ii)key performance indicators;(iii)future new applications;and(iv)potential fields of research,challenges,and open issues. 展开更多
关键词 Wireless networks beyond 5G 6G communications terahertz frequency terahertz communications holographic calls
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A 220 GHz Frequency-Division Multiplexing Wireless Link with High Data Rate 认领 引用 被引量：1
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作者 ZHANG Bo WANG Yihui +2 位作者 FENG Yinian YANG Yonghui PENG Lin 《ZTE Communications》 2023年第3期63-69,共7页
With the development of wireless communication,the 6G mobile communication technology has received wide attention.As one of the key technologies of 6G,terahertz(THz)communication technology has the characteristics of ... With the development of wireless communication,the 6G mobile communication technology has received wide attention.As one of the key technologies of 6G,terahertz(THz)communication technology has the characteristics of ultra-high bandwidth,high security and low environmental noise.In this paper,a THz duplexer with a half-wavelength coupling structure and a sub-harmonic mixer operating at 216 GHz and 204 GHz are designed and measured.Based on these key devices,a 220 GHz frequency-division multiplexing communication system is proposed,with a real-time data rate of 10.4 Gbit/s for one channel and a transmission distance of 15 m.The measured constellation diagram of two receivers is clearly visible,the signal-to-noise ratio(SNR)is higher than 22 dB,and the bit error ratio(BER)is less than 10−8.Furthermore,the high definition(HD)4K video can also be transmitted in real time without stutter. 展开更多
关键词 frequency-division multiplexing sub-harmonic mixer terahertz communication terahertz duplexer
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Design of a Novel THz Modulator for B5G Communication 认领 引用 被引量：1
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作者 Omar A.Saraereh 《Computers, Materials & Continua》 SCIE EI 2022年第10期1055-1066,共12页
Wireless data traffic has expanded at a rate that reminds us of Moore’s prediction for integrated circuits in recent years,necessitating ongoing attempts to supply wireless systems with ever-larger data rates in the ... Wireless data traffic has expanded at a rate that reminds us of Moore’s prediction for integrated circuits in recent years,necessitating ongoing attempts to supply wireless systems with ever-larger data rates in the near future,despite the under-deployment of 5G networks.Terahertz(THz)communication has been considered a viable response to communication blackout due to the rapid development of THz technology and sensors.THz communication has a high frequency,which allows for better penetration.It is a fast expanding and evolving industry,driven by an increase in wireless traffic volume and data transfer speeds.A THz modulator based on a hybrid metasurface was devised and built in this work.The device’s modulation capabilities were modelled and proved experimentally.The electrolyte is an ion-gel medium implanted between graphene and metasurface,and the active material is graphene.On the metasurface,the interaction between the THz wave and graphene is improved.Additionally,an external bias voltage was employed to actively regulate the THz waves by tuning the electrical conductivity of graphene.The results show that with a minimal bias voltage,the device can achieve a modulation depth of up to 73%at the resonant frequency.Furthermore,during the modulation process,the resonance frequency remains almost constant.As a result,the proposed gadget offers a unique tool for substantial THz amplitude modulation at low voltages. 展开更多
关键词 Terahertz communication modulator metasurface graphene
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A Semi-Blind Method to Estimate the I/Q Imbalanc of THz Orthogonal Modulator 认领 引用 被引量：1
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作者 Juan Liu Ge Liu +4 位作者 Qiuyu Wu Ying Wang He Yue Changxing Lin Xianjin Deng 《China Communications》 SCIE EI CSCD 2021年第5期202-209,共8页
In terahertz communication,the direct frequency conversion structure in which orthogonal mixer is the main frequency conversion unit,makes engineers get into trouble of in-phase(I)branch and quadrature(Q)branch imbala... In terahertz communication,the direct frequency conversion structure in which orthogonal mixer is the main frequency conversion unit,makes engineers get into trouble of in-phase(I)branch and quadrature(Q)branch imbalance,carrier wave leakage,etc.These damages result in system performance tremendous degrades.We proposed a semiblind method to estimate the I/Q imbalance of THz orthogonal modulator,based on predefined preamble and pilot symbols for quadrature amplitude modulation(QAM).In this paper,a transmitter with Y band quadrature mixer and 20Gbps base-band signal has been tested.The bandwidth of the baseband signal was 7GHz,and the modulation type was 16QAM.By this method,7dB improvement of the system’s symbol Mean Square Error(MSE)has been got.That means the proposed method can be used to eliminate the I/Q imbalance effectively. 展开更多
关键词 terahertz communication quadrature modulator I/Q imbalance correction digital signal processing
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Dynamic dual-mode terahertz device with nonvolatile switching for integrated on-chip and free-space applications 认领 引用
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作者 Yisheng Dong Xieyu Chen +9 位作者 Shoujun Zhang Zhihao Wang Hongyi Li Kuan Liu Guanghong Xu Quan Xu Quan Li Chunmei Ouyang Tun Cao Zhen Tian 《Microsystems & Nanoengineering》 SCIE EI CSCD 2025年第5期275-285,共11页
Terahertz communication systems demand versatile devices capable of simultaneously controlling propagating waves and surface plasmon polaritons(SPPs)in far-field(FF)and near-field(NF)channels,yet existing solutions ar... Terahertz communication systems demand versatile devices capable of simultaneously controlling propagating waves and surface plasmon polaritons(SPPs)in far-field(FF)and near-field(NF)channels,yet existing solutions are constrained by volatile operation,single-function limitations,and the inability to integrate NF and FF functionalities.Here,we present a nonvolatile reconfigurable terahertz metasurface platform leveraging the phase-change material Ge2Sb2Te5(GST)to achieve on-demand dual-channel modulation—a first in the terahertz regime.By exploiting the stark conductivity contrast of GST between amorphous and crystalline states,our design enables energy-efficient switching between NFSPP manipulation and FF-wavefront engineering without requiring continuous power input.Experimental validation demonstrates two devices:Device I dynamically transitions between NF SPP focusing and FF vortex beam generation,while Device II toggles NF anomalous SPP focusing and FF holographic imaging.The metasurface uniquely integrates simultaneous amplitude/phase control for SPPs and free-space waves,overcoming the single-channel limitations of prior works.With reversible switching cycles and nonvolatile state retention(>10 years),this platform bridges the gap between on-chip plasmonics and free-space terahertz technologies,offering transformative potential for applications in 6 G communication,encrypted data storage,and multifunctional metasensors. 展开更多
关键词 free space applications terahertz metasurface platform terahertz device integrated chip propagating waves surface plasmon polaritons spps terahertz communication systems nonvolatile switching
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