Current Issue : January - March Volume : 2020 Issue Number : 1 Articles : 5 Articles
To meet the diverse industrial and market demands, the International Telecommunication\nUnion (ITU) has classified the fifth-generation (5G) into ultra-reliable low latency communications\n(URLLC), enhanced mobile broadband (eMBB), and massive machine-type communications (mMTC).\nResearchers conducted studies to achieve the implementation of the mentioned distributions efficiently,\nwithin the available spectrum. This paper aims to highlight the importance of URLLC in accordance\nwith the approaching era of technology and industry requirements. While highlighting a few\nimplementation issues of URLLC, concerns for the Internet of things (IoT) devices that depend on\nthe low latency and reliable communications of URLLC are also addressed. In this paper, the recent\nprogress of 3rd Generation Partnership Project (3GPP) standardization and the implementation of\nURLLC are included. Finally, the research areas that are open for further investigation in URLLC\nimplementation are highlighted, and efficient implementation of URLLC is discussed....
We report on the theoretical investigation of using an amorphous Ge0.83Si0.17 lateral taper\nto enable a low-loss small-footprint optical coupling between a Si3N4 waveguide and a low-voltage\nGe-based Franz-Keldysh optical modulator on a bulk Si substrate using 3D Finite-Difference\nTime-Domain (3D-FDTD) simulation at the optical wavelength of 1550 nm. Despite a large\nrefractive index and optical mode size mismatch between Si3N4 and the Ge-based modulator,\nthe coupling structure rendered a good coupling performance within fabrication tolerance of\nadvanced complementary metal-oxide semiconductor (CMOS) processes. For integrated optical\nmodulator performance, the Si3N4-waveguide-integrated Ge-based on Si optical modulators could\nsimultaneously provide workable values of extinction ratio (ER) and insertion loss (IL) for optical\ninterconnect applications with a compact footprint....
It is a promising way to successfully operate the fifth generation (5G) system with Internet of Things (IoT) in potential mmWave\nspectrum bands. This paper investigates the intelligent co-channel coexistence between the 5G IoT system and the fixed-satellite\nservice (FSS) system at 40 GHz. The key issue, as identified, is the accurate estimation of interference based on mmWave\npropagation characteristics. Our simulation results reveal that interference from the 5G IoT system into the FSS ground stations\ncan be kept below the protection threshold by considering different deployment parameters, such as antenna patterns, height of\nEarth station (ES), and separation distance....
In this paper, the systematic design of a multiple antenna system for 5G smartphone\noperating at 3.5 GHz for multiple-input multiple-output (MIMO) operation in smartphones is\nproposed. The smartphone is preferred to be lightweight, thin, and attractive, and as a result metal\ncasings have become popular. Using conventional antennas, such as a patch antenna, Inverted-F\nantennas, or monopole, in proximity to metal casing leads to decreasing its total efficiency and\nbandwidth. Therefore, a slot antenna embedded in the metal casing can be helpful, with good\nperformance regarding bandwidth and total efficiency. The proposed multiple antenna system\nadopted the unit open-end slot antenna fed by Inverted-L microstrip with tuning stub. The measured\nS-parameters results agree fairly with the numerical results. It attains 200 MHz bandwidth at 3.5 GHz\nwith ports isolation .......................
Mobile Opportunistic Networks (OppNets) are infrastructure-less networks consisting of wireless mobile nodes and have been a\nfocus of research for years. OppNets can be scaled up to support rapid growth of wireless devices and technologies, especially\nsmartphones and tablets. Mobile Ad Hoc Networks (MANETs), one of OppNets technologies, have a high potential to be used for\nfacilitating an extension for the Internet and a backup communication platform in disaster situation. However, a connection\ndisruption due to node mobility and unreliable wireless links is possible to trigger a flooding operation of route repair process. This\nresults in transmission delay and packet loss. The flooding of routing packets is an expensive operation cost in MANETs which\naffects network reliability and wastes limited resources such as network bandwidth and node energy. These are obstacles to\npractical implementation of MANETs in real-world environment. In this paper, we propose Low Overhead Localized Flooding\n(LOLF), an efficient overhead reduction routing extension based on Query Localization (QL) routing protocol. Thepurpose of this\nwork is to control the propagation of routing packets in the route discovery and route repair mechanisms while incurring only a\nsmall increase in the size of control information in the packet. Simulation results from extensive experiments show that our\nproposed method can reduce overall routing overhead, energy consumption, and end-to-end delay without sacrificing the packet\ndelivery ratio compared to existing protocols....
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