Researcher:
Yılmaz, Türker

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Türker

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Yılmaz

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Yılmaz, Türker

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2014 - 202013

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Now showing 1 - 10 of 13
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    Millimetre wave communication for 5G iot applications
    (Springer International Publishing Ag, 2016) N/A; N/A; Department of Electrical and Electronics Engineering; Yılmaz, Türker; Gökkoca, Gökçe; Akan, Özgür Barış; PhD Student; Master Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; Graduate School of Social Sciences and Humanities; College of Engineering; N/A; N/A; 6647
    Mobile communications industry is going through an era of very rapid advancement as multiple major innovations are about to take place. Fifth generation (5G) of mobile communication systems is developed to become an all-encompassing solution to fundamentally every broadband wireless communication need of the next decade. Since both the communication and electronic technologies are matured enough, machine-to-machine communication is also about to take off, placing a completely new set of demands on the wireless networks. As the spectrum is already limited in the conventional sub 6 GHz bands, in order to generate efficient applications for the Internet of Things (IoT) within the 5G systems, utilization of new frequency bands are needed. Comprising, both licensed and unlicensed, ample bandwidth, millimetre wave (mm-wave) band is the primary candidate for adoption. In line with these, in this chapter mm-wave band is analyzed for use in 5G IoT implementations. Subsequent to introduction, a brief description of mm-wave band channel characteristics is provided. Then, enabling physical layer techniques of modulation, error control coding and multiple input multiple output are reviewed from the 5G mm-wave point of view. Following conclusions, the chapter ends with open research issues and future research directions.
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    Employing 60 GHz ISM band for 5G wireless communications
    (IEEE, 2014) Fadel, Etimad; N/A; Department of Electrical and Electronics Engineering; Yılmaz, Türker; Akan, Özgür Barış; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 6647
    Wireless data traffic is continuously increasing due to the steady rise in both connected device number and traffic per device. Wireless networks, traditionally confined below 6 giga-hertz, are getting clogged and unable to satisfy the ever-increasing demands of its users. Already aware of this, telecommunications industry and academia have been working on solutions. One of the main methods for throughput increase is operation bandwidth expansion; however, sufficient spectrum is not available within the conventional frequencies. Following various considerations, 60 GHz industrial, scientific and medical radio band has been selected as the new spectrum to be utilized and wireless personal and local area network standards for the band are already completed. In line with the stated developments, this paper proposes the use of 60 GHz band for the fifth generation (5G) communication systems. After very briefly setting the scene of the current wireless communication networks, the physical layer properties of the 60 GHz band are presented. A representative indoor simulation between the fourth generation and proposed 5G cases is set and performed. The results are assessed and compared before concluding the paper.
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    On the use of the millimeter wave and low terahertz bands for internet of things
    (IEEE-Inst Electrical Electronics Engineers Inc, 2015) Department of Electrical and Electronics Engineering; N/A; Akan, Özgür Barış; Yılmaz, Türker; Faculty Member; PhD Student; Department of Electrical and Electronics Engineering; College of Engineering; Graduate School of Sciences and Engineering; 6647; N/A
    Two major wireless communication evolutions, the fifth generation (5G) mobile systems and machine-to-machine (M2M) communication boom, are imminent. A major 5G challenge is supplying the higher than ever data rate and traffic demands using the already crunched conventional spectrum, where the expected addition of billions of new M2M connections will worsen the situation. Millimetre wave (mm-wave) band offers one substantial solution, through the utilization of parts of its vast frequency range. Following a general overview and the theoretical background, this paper provides the first realistic channel capacity and bit rate analyses in the literature for the 60 gigahertz (GHz) and low-terahertz bands, and compares those with the sub 6 GHz band links from the perspective of Internet of Things (IoT) application deployments. It is found that, considering the network densification intrinsic to the M2M communications, the use of the mm-wave band is a viable method to form stable and high performance links which are capable of supporting advanced IoT services.
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    Millimeter-wave communications for 5G wireless networks
    (Crc Press-Taylor and Francis Group, 2016) N/A; Department of Electrical and Electronics Engineering; Yılmaz, Türker; Akan, Özgür Barış; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 6647
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    Utilizing terahertz band for local and personal area wireless communication systems
    (IEEE, 2014) N/A; Department of Electrical and Electronics Engineering; Yılmaz, Türker; Akan, Özgür Barış; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 6647
    User demand on wireless communications is growing every day, however frequency spectrum is a scarce source that cannot infinitely supply the ever-increasing communication demand. Most of the research activities addressing this problem have traditionally been focused on spectral efficiency improvement and signalling overhead minimization efforts, therefore improvement in these domains is tougher than ever. the other main method for throughput enhancement is increasing the operation frequency, and towards this end, the utilization of terahertz band for the next-generation of wireless communications systems is investigated in this paper. Following a general overview, An indoor computer simulation is set up to reveal both the feasibility and advantages of THz band compared to the currently used frequency spectrum. the results show that, peak data rates on the order of 10 Gb/s is possible over low-THz band; however, there are hindering issues such as coverage area and low-cost device availability.
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    A hexagonal grid based human blockage model for the 5G low terahertz band communications
    (IEEE, 2018) N/A; N/A; Ertürk, Onur; Yılmaz, Türker; PhD Student; PhD Student; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; N/A; N/A
    Users continuously demand higher connection speeds and data traffic from wireless communication networks. the newly required network capacity should be provided by higher frequency bands, because legacy sub-6 GHz bands are already operating using advanced communication techniques that provide very high spectral efficiencies. Consequently, millimeter wave communication standards are either complete or ongoing, and general submillimeter wave applications are next in line. accordingly, this paper proposes a motion model in hexagonal grid of a person carrying a user equipment. Electromagnetic wave blockage analyses by utilizing channel characteristics of the low-THz band are presented. Lastly, the communication and blockage probabilities of an exemplary system are both theoretically examined and numerically simulated.
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    PublicationOpen Access
    Employing 60 GHz ISM band for 5G wireless communications
    (Institute of Electrical and Electronics Engineers (IEEE), 2014) Fadel, Etimad; Yılmaz, Türker; Akan, Özgür Barış; College of Engineering
    Wireless data traffic is continuously increasing due to the steady rise in both connected device number and traffic per device. Wireless networks, traditionally confined below 6 giga-hertz, are getting clogged and unable to satisfy the ever-increasing demands of its users. Already aware of this, telecommunications industry and academia have been working on solutions. One of the main methods for throughput increase is operation bandwidth expansion; however, sufficient spectrum is not available within the conventional frequencies. Following various considerations, 60 GHz industrial, scientific and medical radio band has been selected as the new spectrum to be utilized and wireless personal and local area network standards for the band are already completed. In line with the stated developments, this paper proposes the use of 60 GHz band for the fifth generation (5G) communication systems. After very briefly setting the scene of the current wireless communication networks, the physical layer properties of the 60 GHz band are presented. A representative indoor simulation between the fourth generation and proposed 5G cases is set and performed. The results are assessed and compared before concluding the paper.
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    PublicationOpen Access
    On the use of low terahertz band for 5G indoor mobile networks
    (Elsevier, 2015) Yılmaz, Türker; Akan, Özgür Barış; College of Engineering
    Mobile data traffic is constantly rising at huge growth rates. One evolving method to counter this expansion is operation frequency, and so bandwidth, increase, as formal standardization activities on 60 gigahertz industrial, scientific and medical radio band began in 2005. In line with this, this paper proposes the utilization of low terahertz (THz) band for the next-generation of mobile and wireless communications systems. Following the introduction and an overview of the low-THz band propagation properties, representative indoor simulations comparing the current fourth generation and proposed high frequency fifth generation networks are presented. The results show that, while it is possible to form and maintain stable communication links at low-THz band, techniques to reduce signal attenuation should be researched within all related subjects.
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    PublicationOpen Access
    Attenuation constant measurements of clear glass samples at the low terahertz band
    (Wiley, 2020) Department of Electrical and Electronics Engineering; Yılmaz, Türker; Akan, Özgür Barış; Faculty Member; Department of Electrical and Electronics Engineering; College of Engineering
    The technical performance requirements from wireless communication networks are continuously rising. One method to satisfy the demands is increasing the carrier frequency to the millimetre wave or low terahertz band spectrum to utilise wider operation bandwidth. In order to facilitate the studies in this frequency range, the corresponding electromagnetic (EM) wave properties, channel attributes and material characteristics need to be analytically formulated. In line with these, this Letter initially presents the theoretical expressions governing the EM wave transmission across a conducting medium. Then, by using the relative S21 parameter quantities in the proposed attenuation constant (alpha) computation technique, the alpha results of the measurements performed between 260 and 350 GHz for the clear window glass samples of different thicknesses are given. This Letter concludes with the evaluation of the outcomes.
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    PublicationOpen Access
    Energy-efficient modulation and physical layer design for low terahertz band communication channel in 5G femtocell Internet of Things
    (Elsevier, 2018) Department of Electrical and Electronics Engineering; Khalid, Nabil; Yılmaz, Türker; Akan, Özgür Barış; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering
    High throughput capability of the terahertz band (0.3-10 THz) wireless communications is expected to be utilized by the fifth generation of mobile telecommunication systems and enable a plethora of new applications. Supporting devices will transfer large amounts of data in both directions, causing high energy consumption by the electronic circuitries of the equipment in use. Therefore, physical layer for these systems must be designed carefully in order to reduce energy consumption per bit. In this paper, the best performing modulation scheme and hardware parameters that minimize the energy consumption without affecting the system throughput are determined. THz band device technologies are outlined and a complete survey of the state-of-the-art low-THz band circuit blocks which are suitable for mass market production is given. It is shown that for short-range communications, M-ary quadrature amplitude modulation is the most energy-efficient technique that can lead up to 90% reduction in consumed energy. Moreover, optimal transceiver parameters which can be used to further minimize the energy consumption of the THz band system are examined.