MAC protocols in ultra-wide band system by YUE Ran1, ZHANG Qin-yu2, ZHANG Nai-tong1, ZHENG Shi2

“…Recently,the ultra-wide band （UWB）-based technique is focused on more deeply along with the design of MAC （media access control） for its advantages.Comparing with the conventional wireless communication system,the UWB system has its unique characteristics,higher speed rate,lower PSD （power spectrum density）,etc.It is therefore necessary to propose advanced MAC protocols for matching the requirements of the system.In this study,the performance of various types of MAC protocols based on UWB system is investigated.The physical structures for different MAC protocols are compared.Some special demands from UWB for MAC are analyzed.The advanced design for the MAC protocols in UWB is proposed.It may provide the implementation base for future MAC protocols.…”
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L’archéologue dans la bande dessinée de science-fiction francophone by Rémi Auvertin

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Enhancing Carriers’ Confinement by Introducing BAlGaN Quantum Barriers for the Better Optoelectronic Performance of Deep UV LEDs by Jamshad Bashir, Muhammad Usman, Dmitri Sergeevich Arteev, Zoya Noor, Ahmed Ali

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Design and performance analysis of digitally controlled multi-mode multi-band power amplifier for Sub-6 GHz applications by Ganesh Racha, K Lal Kishore, Yedukondalu Kamatham, Srinivasa Rao Perumalla

“…This device helps to support multiple applications using different technology modes and frequency bands. This device is designed by using an RFFE with a Power Amplifier, LNA, Up/Down converters, etc. …”
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A Triple-Band Slotted Patch Antenna With Metasurface Loading for UHF-RFID, Satellite Communication, and 5G Applications by Sayan Sarkar, Bhaskar Gupta

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Study of adsorption behavior of HCN and H2S molecules over undoped and Al-doped zinc oxide monolayer: A DFT approach by Dipak Oli, Om Shree Rijal, Ravi Kiran Neupane, Pitamber Shrestha, Shriram Sharma, Leela Pradhan Joshi, Rajendra Parajuli

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Energetic disorder dominates optical properties and recombination dynamics in tin-lead perovskite nanocrystals by Dandan Wang, Yusheng Li, Yongge Yang, Chao Ding, Yuyao Wei, Dong Liu, Hua Li, Huan Bi, Shikai Chen, Sujun Ji, Boyu Zhang, Yao Guo, Huiyun Wei, Hongshi Li, Shuzi Hayase, Qing Shen

“…We reveal how these disorders shape band-tail structure and ultimately influence inter-band carrier recombination behaviors. …”
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A Low Complexity Dual-Phase Alternating Scheme is Used With the PTS Method to Reduce PAPR for B5G Systems by Yung-Ping Tu, Chen-Wei Hsu

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Influence of Air Annealing and Gamma Ray Irradiation on the Optical Properties of Cl16FePc Thin Films by Raji Koshy, C. S. Menon

“…Optical transition is found to be of direct type and optical band gaps are determined by analyzing the absorption spectrum. …”
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Evolution and industry trend of 5G key technologies by Jing CHONG, Xiaoyong TANG, Lei ZHU, Na LI, Jue ZHANG, Zhengpeng YOU, Peike XU, Jia LIU

“…With the further integration of 5G and the industry, the current standard-defined Release 15/Release 16/Release 17 capabilities were slightly insufficient to support industry needs.The technological evolution direction of 5G-Advanced (Release 18) was reviewed in detail, and potential technical solutions for the technological evolution were given, including downlink MIMO enhancement, uplink transmission enhancement, mobility enhancement, topology transmission technology enhancement, Sidelink enhancement, RedCap technology evolution, positioning capability expansion and enhancement, AI/ML 5G, etc.At the same time, the current industry scene was analyzed in detail, those existing problems including industry terminal access, access network, E2E QoS guarantee, etc.The 5G technologies including SLA-based industry networking, high out-of-band (OOB) suppression, multi-buffer scheduling (MBS), fully connected industry access network technology, computing force network (CFN) technology, and potential implementation methods were proposed.…”
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5G large-scale array antenna technology development and innovation direction by Shengjun LUO, Shenke ZHANG

“…In view of the current system architecture and technical solutions of 5G large-scale antennas,new technological developments and innovation directions were proposed,including low profile and light weight radiation element,high precision amplitude and phase calibration networks,all-in-one dense radiation arrays,and highly integrated antenna without reflection,antenna integrated filter,antenna and filter common module,mechanical phase shift and digital shaping combined,5G dual-band antenna,4G ＆amp; 5G intelligent antenna,etc.For each technological innovation direction,an overview and useful description were given.…”
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Study on RF module in UHF OFDM node for mobile multimedia sensor network by PANG Rui-fan, JIANG Jian, WANG Ying-guan, ZHANG Hong-jun, LIU Hai-tao

“…It adopts direct frequency conversion and power back-off technologies, supports high speed multiplex data transmission in time division multiple access （TDMA） mobile network, and has the ability of high linearity, high sensitivity, wide dynamic range and high out-of-band suppres-sion. It can be applied to very important person （VIP） motorcade video wireless monitoring system, public security emergency command system, and battlefield surveillance system, etc.…”
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Research on theoretical ultimate value of 5G flow residence ratio based on big data by Hongjia LIU, Bei LI, Wei ZHAO, Guoping XU, Xinyan WANG

“…The 5G flow residence ratio is an important indicator used by communication operators to evaluate the coverage capacity of 5G networks, and it is also an important starting point for the networks’ planning, optimization, maintenance and operation.To ensure user perception, the actual wireless transmission influencing factors, existing network structure and network coordination strategy, etc., need to be considered.The resident capacity of a 5G network in the 3.5 GHz frequency band was evaluated, analyzed and calculated, and the theoretical ultimate value of the 5G traffic resident ratio based on the analysis of network and users’ big data was put forward, which explained the positive relationship between user perception and residence ratio, and provided a reference for the reasonable theoretical ultimate value of 5G traffic resident ratio.…”
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Overview of the Near-IR S0 Galaxy Survey (NIRS0S) by E. Laurikainen, H. Salo, R. Buta, J. H. Knapen

“…NIRS0S is a magnitude- (mB⩽12.5 mag) and inclination- (<65∘) limited sample of ̃200 nearby galaxies, mainly S0s, but includes also Sa and E galaxies. It uses deep Ks-band images, typically reaching a surface brightness of 23.5 mag arcsec−2. …”
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Improved sound absorption with 3D-printed micro-perforated sandwich structures by Peng-Fei Zhang, Zhong-Hua Li, Yu-Jun Zhou, Qi-Fei Zhang, Bin Liu, Fei Liu, Si-Chen Pei, Ke Shi, Pei-kang Bai

“…The micro-perforated sandwich structure based on triply periodic minimal surfaces (TPMS) is a lightweight, high-strength and multi-functional structure, which integrates heat exchange, impact resistance, energy absorption, etc., and has been widely used in many fields such as aviation and aerospace. …”
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QUANTITATIVE DETECTION METHOD OF ASSEMBLY TIGHTNESS OF BOLTED ROTOR BASED ON GHM MULTIWAVELET by YAN Qiang, ZHANG XiaoLi, ZHAO JunFeng, YANG Ji, SHEN YanBin

“…The bolted rotor is a typical rotor structure with light weight, high strength, good rigidity, flexible selection of all kinds of wheel materials, etc., which is formed by pressing and combining several sections of rotors or discs and is widely used in aero-engines and gas turbines. …”
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Application and research of SDN-based management and control technology for optical transport grey-box devices by Qian HU, Guoyong ZHAO, Xiaoli HUO, Junjie LI, Ruiquan JING, Fei YAN, Xiaofeng WU

“…Traditional optical transport network is gradually becoming open and disaggregated, and the chimney-type single-vendor and single-domain management mode is also developing to the multi-vendor and multi-domain management mode with the penetration of software defined network (SDN) concept.Considering the equipment difference and protocol complexity of transport network, application of SDN management and control for transport network faces challenges.Firstly, the concept of grey-box was proposed, which was between black-box and white-box.Then, taking grey-box access OTN as an example, the key technologies of SDN unified management and control of access-type OTN were discussed, including management and control architecture, service template, automatic topology generation, automatic equipment online, remote upgrade of equipment, in-band DCN communication between different vendors, etc.Finally, the application of access-type OTN unified management and control system in real network was described.…”
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Fast link-establishment method of integrated of communication and detection based on short-wave digital channelization by Guojun LI, Cuiling XIANG, Changrong YE, Zunli WANG

“…A link-establishment method based on short-wave digital channelized receiver was proposed for the traditional automatic link establishment technology in short-wave communications with the low accuracy of frequency selection, low efficiency of link establishment, and low utilization of resources, etc.The parallel receiving mechanism for full frequency band in short-wave communications was realized by using digital channelization.An integrated waveform of communication and detection was designed to deal with the time redundancy and equipment compatibility problems caused by waveform switching during link establishment.A fast link-establishment method was designed, to achieve a fast and robust connection in complex electromagnetic environments.The results show that the channelized structure can enhance the receiving performance of the link-establishment system, the link-establishment method has obvious advantages, channel parameter estimation method has a high estimation accuracy compared to the traditional link-establishment method and the applicability of the proposed method in practical short-wave channel environment is verified.…”
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Adsorption Properties of NF3 and N2O on Al- and Ga-Doped Graphene Surface: A Density Functional Theory Study by Qilin Yi, Gang Wei, Zhengqin Cao, Xiaoyu Wu, Yuanyuan Gao

“…Through the analysis of adsorption distance, charge transfer, adsorption energy, energy band structure, etc., the results indicated that the adsorption effect of Al- and Ga-doped graphene to NF3 and N2O are probably good, and these nanomaterials are potential to apply for the monitoring of GIS internal faults.…”
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Electromagnetic Characterization of a Composite (RE-CB-MT) by Time Domain Spectroscopy by Amina Bounar, Nacerdine Bouzit, Nacerdine Bourouba

“…The aim of this article is to study the dielectric behavior (ε, σ) in microwaves domain of composites made with Epoxy Resin (RE), Carbon Black (CB), and Magnesium Titanate (MT) on a large band of frequency. This kind of composites is very solicited for applications and miniaturization of the components circuits (cavities, antennas, substrates, etc.) in hyperfrequency electronics. …”
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