A Survey of the DVB-T Spectrum: Opportunities for Cognitive Mobile Users

Csurgai-Horváth, László; Rieger, Istvan; Kertesz, Jozsef

doi:10.1155/2016/3234618

Cited by 7 publications

(6 citation statements)

References 24 publications

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“…It is enough for completion of an RTS/CTS operation. The activity rate of PUs is very low in the cognitive radio environment [ 2 , 3 , 4 ]. Hence, it is not likely for PUs to be active more frequently.…”

Section: Proposed Mac Protocolmentioning

confidence: 99%

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Multiple Access Control for Cognitive Radio-Based IEEE 802.11ah Networks

Shafiq

Ahmad

Irshad

et al. 2018

Sensors

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The proliferation of Internet-of-Things (IoT) technology and its reliance on the license-free Industrial, Scientific, and Medical (ISM) bands have rendered radio spectrum scarce. The IoT can nevertheless obtain great advantage from Cognitive Radio (CR) technology for efficient use of a spectrum, to be implemented in IEEE 802.11af-based primary networks. However, such networks require a geolocation database and a centralized architecture to communicate white space information on channels. On the other hand, in spectrum sensing, CR presents various challenges such as the Hidden Primary Terminal (HPT) problem. To this end, we focus on the most recently released standard, i.e., IEEE 802.11ah, in which IoT stations can first be classified into multiple groups to reduce collisions and then they can periodically access the channel. Therein, both services are similarly supported by a centralized server that requires signaling overhead to control the groups of stations. In addition, more regroupings are required over time due to the frequent variations in the number of participating stations, which leads to more overhead. In this paper, we propose a new Multiple Access Control (MAC) protocol for CR-based IEEE 802.11ah systems, called Restricted Access with Collision and Interference Resolution (RACIR). We introduce a decentralized group split algorithm that distributes the participating stations into multiple groups based on a probabilistic estimation in order to resolve collisions. Furthermore, we propose a decentralized channel access procedure that avoids the HPT problem and resolves interference with the incumbent receiver. We analyze the performance of our proposed MAC protocol in terms of normalized throughput, packet delay and energy consumption with the Markov model and analytic expressions. The results are quite promising, which makes the RACIR protocol a strong candidate for the CR-based IoT environment.

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Section: Proposed Mac Protocolmentioning

confidence: 99%

“…Radio frequencies are traditionally assigned to groups of similar services for long-term periods by static spectrum allocation [ 1 ]. In this method, each channel is exclusively assigned to a single service provider, which often leads to a huge waste of spectrum [ 2 , 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Multiple Access Control for Cognitive Radio-Based IEEE 802.11ah Networks

Shafiq

Ahmad

Irshad

et al. 2018

Sensors

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“…The concept mainly relies on the fact that DTT broadcasting topology uses high power high tower transmitters, which leaves local opportunities to reuse the spectrum with low power communication systems. The availability of TVWS spectrum has been widely studied through measurements [21][22][23][24][25] and propagation modeling [26][27][28][29][30].…”

Section: The Utilization Of Uhf Tv Broadcasting Spectrum In Europementioning

confidence: 99%

Coexistence of DTT and Mobile Broadband: A Survey and Guidelines for Field Measurements

Kalliovaara

Ekman

Talmola

et al. 2017

Wireless Communications and Mobile Computing

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This article provides a survey and a general methodology for coexistence studies between digital terrestrial television (DTT) and mobile broadband (MBB) systems in the ultra high frequency (UHF) broadcasting band. The methodology includes characterization of relevant field measurement scenarios and gives a step-by-step guideline on how to obtain reliable field measurement results to be used in conjunction with link budget analyses, laboratory measurements, and simulations. A survey of potential European coexistence scenarios and regulatory status is given to determine feasible future use scenarios for the UHF television (TV) broadcasting band. The DTT reception system behavior and performance are also described as they greatly affect the amount of spectrum potentially available for MBB use and determine the relevant coexistence field measurement scenarios. Simulation methods used in determining broadcast protection criteria and in coexistence studies are briefly described to demonstrate how the information obtained from field measurements can be used to improve their accuracy. The presented field measurement guidelines can be applied to any DTT-MBB coexistence scenarios and to a wide range of spectrum sharing and cognitive radio system coexistence measurements.

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“…In the TAMOP FIRST project (2012-14) the TV White Space was investigated and a new model was developed for cognitive radio applications [108]. The recent activity of the laboratory is participation in Ka/Q band (20-40GHz) propagation and communication experiments of the ESA (European Space Agency) Alphasat programme.…”

Section: Rf Laboratory For Space Researchmentioning

confidence: 99%

BME VIK Annual Research Report on Electrical Engineering and Computer Science 2016

Charaf

Harsányi

Poppe

et al. 2017

Period. Polytech. Elec. Eng. Comp. Sci.

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Preface Since being established in 1949, the Faculty of Electrical Engineering and Informatics (VIK) BME has played a flagship role in the development of electronics, IT and computer science in Hungary.We László Jakab (dean, BME VIK) János Levendovszky (vice-dean in charge of scientific affairs, BME VIK) are proud of combining engineering applications with sound scientific results, which is the assurance of high-level industrial collaboration leading to novel results and innovation. The various collaborations with our industrial partners has made it clear that the industry expects methods and results which make their industrial processes more effective and increase productivity and quality. Thus, participation in these collaborations give a competitive edge and ensure the continuous development of VIK. These factors have positioned our Department of Automation and Applied InformaticsDepartment of Automation and Applied Informatics (AUT) is one of the largest and dynamically developing departments at BME with diverse scope competences such as control theory, embedded systems, software modelling, applied software development, Internet of Things, power electronics, mechatronics, and many others. The department's main activities are education, research and development. Training versatile electrical and software engineers with solid practical knowledge is our top priority. Our profile also includes developing high quality software and hardware solutions for industry partners. All of our activities are backed by strong research background.In 2016, the department organized and hosted a number of domestic and international events. In cooperation with the industry, AUT has organized the IoT4U conference. It was dedicated to Internet of Things, cloud and data management as well as the integration of IoT into various formats. RobonAUT, the yearly domestic amateur robotics contest was organized by the department in February 2016. The yearly contest is open to teams of students, organized either in student projects within the department or independent research teams.The next sections summarize the key research results of the department in year 2016. Software Development Methods and Mobile PlatformsThe diversity of mobile platforms necessitates the development of the same mobile application for all major mobile platforms, what requires considerable development effort. Mobile application developers are multiplatform developers, but they still prioritize the platforms, therefore, not all platforms are equally important for them. Appropriate methods, processes and tools are required to support the development in order to achieve better productivity.The research on educational mobile applications that adapt to the mental state of the user required a method for estimating the difficulty of tasks found in the serious games. There are generated or random assignments where the effort required from the user is not known or cannot be estimated in advance.61 (2) IoT and Smart CityThe Internet of Things (IoT) is transforming the surroun...

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A Survey of the DVB-T Spectrum: Opportunities for Cognitive Mobile Users

Cited by 7 publications

References 24 publications

Multiple Access Control for Cognitive Radio-Based IEEE 802.11ah Networks

Multiple Access Control for Cognitive Radio-Based IEEE 802.11ah Networks

Coexistence of DTT and Mobile Broadband: A Survey and Guidelines for Field Measurements

BME VIK Annual Research Report on Electrical Engineering and Computer Science 2016

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