1,720,957 research outputs found
Downlink Scheduling in 3GPP Long Term Evolution (LTE)
No full textLTE is the evolution of the Universal Mobile Telecommunications System (UMTS). A scheduler assigns the shared resources (time and frequency) among users terminals. I have examined the impact of different scheduling schemes on the throughput and I also have investigated the fairness of each scheduling scheme. The main contribution of this thesis is to propose a new scheduling algorithm that can be comprise between the throughput and the fairness.TelecommunicationsElectrical Engineering, Mathematics and Computer Scienc
Device-to-Device Communications Underlaying a Cellular Network
No full textMobile voice service is already considered a necessity by many, and mobile data, video, and TV services are now becoming an essential part of consumers' lives. The number of mobile subscribers is growing rapidly and bandwidth demand due to data and video services is increasing. There is a need for capacity to increase in order for mobile broadband, data access, and video services to engage the end consumer. Device-to-device (D2D) communications underlaying cellular networks entails the ability of a cellular network to allow devices to communicate directly with each other in the operating (licensed) spectrum of the cellular network. With the application of specific rules and strategies, D2D communications offloads the mobile network and increases the spectral efficiency. In this thesis we developed a method for the application of D2D communication, controlled by a cellular network. By deriving the theoretical upper bound on the interference we have analytically derived equations describing the minimum distances to be maintained between simultaneously operating links, to achieve a given minimum SINR. We devised a strategy to group and schedule links which fulfill these minimum requirements, so that multiple links may operate simultaneously. We describe a power optimization method to minimize the number of groups to further improve the efficiency of the occupation of resources. Finally we performed simulations for various D2D scenarios, including a scenario representing a realistic urban environment, to illustrate the potential of this grouping and scheduling strategy.Wireless and Mobile CommunicationsElectrical Engineering, Mathematics and Computer Scienc
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Integrating TETRA with Wireless Mesh Networks
No full textTerrestrial Trunked Radio(TETRA) is a narrow band digital cellular network for Private Mobile Radio (PMR) communications mainly designed for voice communications with limited packet data capability because of band-width limitations. This limited packet data capability of TETRA is used for the integration of the TETRA network with wireless mesh networks. The wireless mesh network used in this thesis work is part of the FIGO network. FIGO is a robust communication system mainly intended for public safety communications and it consists two main network parts. One of these parts is the wireless adhoc network which can be deployed on incident areas. The oher one is the infrastructure omponent (back office node) that is used to nterlink disconnected adhoc nodes and it can also offer access for controlling an incident in the adhoc network. The FIGO network uses different communication technologies to link the adhoc network with the back office node and the main aim of this thesis work is to integrate the TETRA network with the FIGO network so that the TETRA can be used as one of the links from the adhoc network to the back offie node of the FIGO network. The main problem of the TETRA-FIGO integration is that the wireless adhoc network generates a lot of control signals that can easily overload the narrowband packet data channel of the of the TETRA network. In addition to the control overheads, the excessive headers also contribute a lot of overheads to the narrowband TETRA channel. Two architectures are proposed in thesis report to integrate TETRA with the FIGO network and the performance of these two new proposed architectures is analyzed and compared with the existing FIGO network protocols in terms of control traffic and header overheads.WMCTelecommunicationsElectrical Engineering, Mathematics and Computer Scienc
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Joint Cooperative Shared Relaying and Multipoint Coordination for Network MIMO in 3GPP LTE-Advanced Multihop Cellular Networks
Get PDFTelecommunicatieElectrical Engineering, Mathematics and Computer Scienc
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