检索结果-南通市图书馆

A 20.8-Gbps Dual-Carrier Wireless communication Link in 220-GHz Band

在线全文

学校读者我要写书评

暂无评论

China communications 2021年第5期18卷 210-220页

作者： Yinian Feng Bo Zhang Chen Zhi Ke Liu Weilong Liu Fang Shen Chuanqi Qiao Jicong Zhang Yong Fan Xiaobo Yang School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054China Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China Nation Key Laboratory of Science and Technology on communications University of Electronic Science and Technology of ChinaChengdu 610054China School of Information and communication Engineering University of Electronic Science and Technology of ChinaChengdu 610054China

With the successful demonstration of terahertz(THz)high-speed wireless data transmission,the THz frequencies are now becoming a worth candidate for post-5G wireless *** the other hand,to bring THz communications a step closer to real scenario application,solving high data rate realtime transmission is also an important *** paper describes a 220-GHz solid-state dual-carrier wireless link whose maximum transmission real-time data rates are 20.8 Gbps(10.4 Gbps per channel).By aggregating two carrier signals in the THz band,the contradiction between high real-time data rate communication and low sampling rate analog-to-digital(ADC)and digital-to-analog converter(DAC)is *** transmitting and receiving front-ends consist of 220-GHz diplexers,220-GHz sub-harmonic mixers based on anti-parallel Schottky barrier diodes,G-band low-noise amplifiers(LNA),WR-4.3 band high-gain Cassegrain antennas,high data rates dual-DAC and-ADC baseband platform and other *** low-density parity-check(LDPC)encoding is also realized to improve the bit error rate(BER)of the received *** signals are centered at 214.4 GHz and 220.6 GHz with-11.9 dBm and-13.4 dBm output power for channel 1 and 2,*** link is demonstrated to achieve 20.8-Gbps real-time data transmission using 16-QAM modulation over a distance of 1030 *** measured signal to noise ratio(SNR)is 17.3 dB and 16.5 dB,the corresponding BER is 8.6e-7 and 3.8e-7,***,4K video transmission is also carried out which is clear and free of *** successful transmission of aggregated channels in this wireless link shows the great potential of THz communication for future wireless high-rate real-time data transmission applications.

关键词： communication systems millimeter-wave communication quadrature amplitude modulation(QAM) state circuits

In-building coverage of millimeter-wave wireless networks from channel measurement and modeling perspectives

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2020年第8期63卷 5-20页

作者： Peize ZHANG Cheng YI Bensheng YANG Cheng-Xiang WANG Haiming WANG Xiaohu YOU State Key Laboratory of millimeter waves Southeast University National Mobile communications Research Laboratory Southeast University

To progress cost-effective deployment of millimeter-wave(mm wave) wireless networks for indoor users, the prediction of indoor-to-indoor(I2I) and outdoor-to-indoor(O2I) coverage based on field measurement studies is of great interest to the future generation mobile communication system. First, measurements in I2I and O2I scenarios, which have advantages in terms of achieving a fair comparison of channel characteristics across different mm wave bands and bandwidths, are performed. Next, the developed dual-slope path loss model with a break-point distance is found to well fit omnidirectional and directional measured I2I data, especially at 39.5 GHz, revealing that the transition from lit or shadow regions to totally blocked regions is abrupt. Combined with space-time propagation characteristics, the indoor blockage effect on path loss and angular spread is investigated, therein being essential for the design of beam-steering and tracking algorithms. Double-directional measurement results show that most dominant paths arrive along the line-ofsight path, and only a few in-building reflections can be detected in higher frequency bands. Based on the joint analysis of channel measurement and modeling results, several mm wave network design and in-building coverage enhancement insights are presented.

关键词： building entry loss channel modeling in-building coverage millimeter-wave communication propagation measurements

A novel EO-based optimum random beamforming method in mmwave-NOMA systems with sparse antenna array

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Digital communications and Networks 2024年第5期10卷 1313-1321页

作者： Fatemeh Asghari Azhiri Behzad Mozaffari Tazehkand Reza Abdolee Department of Electrical and Computer Engineering University of Tabriz Department of Electrical and Computer Engineering California State University

millimeter-wave(mmwave) Non-Orthogonal Multiple Access(NOMA) with random beamforming is a promising technology to guarantee massive connectivity and low latency transmissions of future generations of mobile *** this paper,we introduce a cost-effective and energy-efficient mmwave-NOMA system that exploits sparse antenna arrays in the *** analysis shows that utilizing low-weight and small-sized sparse antennas in the Base Station(BS) leads to better outage probability *** also introduce an optimum low complexity Equilibrium Optimization(EO)-based algorithm to further improve the outage *** simulation and analysis results show that the systems equipped with sparse antenna arrays making use of optimum beamforming vectors outperform the conventional systems with uniform linear arrays in terms of outage probability and sum rates.

关键词： Beamforming millimeter-wave communication Non-orthogonal multiple access Sparse antenna arrays

A Single-Board Integrated millimeter-wave Asymmetric Full-Digital Beamforming Array for B5G/6G Applications

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Engineering 2024年第10期41卷 35-50页

作者： Qingqing Lin Jun Xu Kai Chen Long Wang Wei Li Zhiqiang Yu Guangqi Yang Jianyi Zhou Zhe Chen Jixin Chen Xiaowei Zhu Wei Hong State Key Laboratory of millimeter waves School of Information Science and EngineeringSoutheast UniversityNanjing 210096China Purple Mountain Laboratories Nanjing 211111China Frontiers Science Center for Mobile Information communication and Security Southeast UniversityNanjing 210096China

In this article,a single-board integrated millimeter-wave(mm-wave)asymmetric full-digital beamforming(AFDBF)array is developed for beyond-fifth-generation(B5G)and sixth-generation(6G)*** proposed integrated array effectively addresses the challenge of arranging a large number of ports in a full-digital array by designing vertical connections in a three-dimensional space and successfully integrating full-digital transmitting(Tx)and receiving(Rx)arrays independently in a single *** the traditional symmetric array,the proposed asymmetric array is composed of an 8×8 Tx array arranged in a square shape and an 8+8 Rx array arranged in an L *** center-to-center distance between two adjacent elements is 0.54k0 for both the Tx and Rx arrays,where k0 is the free-space wavelength at 27 *** proposed AFDBF array possesses a more compact structure and lower system hardware cost and power consumption compared with conventional brick-type full-digital *** addition,the energy efficiency of the proposed AFDBF array outperforms that of a hybrid beamforming *** measurement results indicate that the operating frequency band of the proposed array is 24.25–29.50 *** eight-element linear array within the Tx array can achieve a scanning angle ranging from-47°to+47°in both the azimuth and the elevation planes,and the measured scanning range of each eight-element Rx array is–45°to+45°.The measured maximum effective isotropic radiated power(EIRP)of the eight-element Tx array is 43.2 dBm at 28.0 GHz(considering the saturation point).Furthermore,the measured error vector magnitude(EVM)is less than 3%when 64-quadrature amplitude modulation(QAM)waveforms are used.

关键词： Full-digital beamforming array Asymmetric structure Single-board integrated Beyond fifth-generation and sixthgeneration millimeter-wave communication Complex modulation Printed circuit board Vertical connection

Delivery of 40 Gbit/s W-band signal over 4600 m wireless distance employing advanced digital signal processing

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2022年第10期20卷 96-101页

作者： Bowen Zhu Yanyi Wang Weiping Li Feng Wang Jiaxuan Liu Miao Kong Jianjun Yu Key Laboratory for Information Science of Electromagnetic waves(MoE) Fudan UniversityShanghai 200433China

We experimentally built a photonics-aided long-distance large-capacity millimeter-wave wireless transmission system and demonstrated a delivery of 40 Gbit/s W-band 16-ary quadrature amplitude modulation(QAM)signal over 4600 m wireless distance at 88.5 *** offline digital signal processing algorithms are proposed and employed for signal recovery,which makes the bit-error ratio under 2.4×10^(−2).To the best of our knowledge,this is the first field-trial demonstration of>4 km W-band 16QAM signal transmission,and the result achieves a record-breaking product of wireless transmission capacity and distance,i.e.,184(Gbit/s)·km,for high-speed and long-distance W-band wireless communication.

关键词： millimeter-wave communication digital signal processing W-band photonics-aided technique

Radio propagationmeasurement and cluster-based analysis formillimeter-wave cellular systems in dense urban environments

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2021年第4期22卷 471-487页

作者： Peize ZHANG Haiming WANG Wei HONG State Key Laboratory of millimeter waves Southeast UniversityNanjing 210096China Purple Mountain Laboratories Nanjing 211111China

The deployment of millimeter-wave(mmwave)cellular systems in dense urban environments with an acceptable coverage and cost-efficient transmission scheme is essential for the rollout of fifth-generation and beyond *** this paper,cluster-based analysis of mmwave channel characteristics in two typical dense urban environments is ***,radio propagation measurement campaigns are conducted in two identified mmwave bands of 28 and 39 GHz in a central business district and a dense residential *** customdesigned channel sounder supports high-efficiency directional scanning sounding,which helps collect sufficient data for statistical channel ***,using an improved auto-clustering algorithm,multipath clusters and their scattering sources are *** appropriate measure for inter-and intra-cluster characteristics is provided,which includes the cluster number,the Ricean K-factor,root-mean-squared(RMS)delay spread,RMS angular spread,and their *** of these parameters across two mmwave bands for both line-of-sight(LoS)and non-light-of-sight(NLoS)links are *** shed light on the blockage effects,detailed analysis of the propagation mechanisms corresponding to each NLoS cluster is provided,including reflection from exterior walls and diffraction over building corners and ***,the results show that the cluster-based analysis takes full advantage of mmwave beamspace channel characteristics and has further implications for the design and deployment of mmwave wireless networks.

关键词： millimeter-wave communication Clustering Diffraction Multipath channels Propagation measurement