Erscheinungsdatum: 28.02.2018, Medium: Taschenbuch, Einband: Kartoniert / Broschiert, Titel: Allocation de Ressources Radios Pour Les Services Paquets 3g, Autor: Enderle-N, Verlag: ED UNIVERSITAIRES EUROPEENNES, Imprint: Omn.Univ.Europ., Sprache: Französisch, Schlagworte: COMPUTERS // Communications // Networking // General // LITERARY CRITICISM // Literatur: Geschichte und Kritik, Rubrik: Datenkommunikation // Netze, Mailboxen, Seiten: 184, Reihe: Omn.Univ.Europ, Gewicht: 292 gr, Verkäufer: averdo
Erscheinungsdatum: 23.06.2013, Medium: Taschenbuch, Einband: Kartoniert / Broschiert, Titel: Adaptive FLS for Bandwidth Analysis & Allocation for Cognitive Radios, Titelzusatz: A Novel Approach of Spectrum Management, Autor: Sherwani, Nazia // Khan, M. Saleem, Verlag: LAP Lambert Academic Publishing, Sprache: Englisch, Schlagworte: Computernetzwerke und maschinelle Kommunikation, Rubrik: Datenkommunikation // Netze, Mailboxen, Seiten: 116, Informationen: Paperback, Gewicht: 189 gr, Verkäufer: averdo
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It is our great pleasure to present the proceedings of the Third International Workshop on Multiple Access Communications (MACOM) that was held in Barcelona during September 13-14, 2010. In 1961, Claude Shannon established the foundation for the discipline now known as "multi-user information theory" in his pioneering paper "Two-way Communication Channels," and later Norman Abramson published his paper "The Aloha System-Another Alternative for Computer Communications" in 1970 which introduced the concept of multiple access using a shared common channel. Thereafter, for more than 40 years of study, numerous elegant theories and algorithms have been developed for multiple-access communications. During the 1980s and 1990s the evolution of multiple-access techniques p- ceeded in conjunction with the evolution of wireless networks. Novel multiple access techniques like code division multiple access (CDMA) and orthogonal frequency division multiple access (OFDMA) provided increased spectral - ?ciency, dynamicity and ?exibility in radio resource allocation with intrinsic anti-multipath and anti-interference features. In this ?rst decade of the 21st century,multiple-accesstechniques,derivedfromadvancedwirelesstransmission methodologiesbasedonthediversityconcept(e. g. ,MC-CDMA,MIMO-OFDMA and SC-FDMA), opened the road to a renewed idea of multiple access. Today multiple-access communications involve many challenging aspects not only l- ited (like in the past) to physical layer design. Medium access control (MAC) techniques play a crucial role in managing the radio resources that users will exploit to transmit their data streams. Recent developments in software radios and cognitive radios have led to a signi?cant impact also on spectrum m- agement and access paradigms.
One of the important point in cognitive radios is how those radios are going to be managed either externally or internally. Here is the solution one of the primary technique of spectrum allocation are used and implemented by MATLAB code simulation with full code details inside this thesis. In addition there is a proof of the FCC results about primary users usage of the spectrum which is 70% of the spectrum are unused, so for maximum utilization we are developed a management technique that can increase the utilization of the spectrum.
Cognitive radio (CR) is a kind of wireless communication wherein a transceiver can intelligently sense the vacant and occupied communication channels and promptly move into vacant channels while staving off occupied ones. This enables the optimum use of available Radio-Frequency (RF) spectrum whereas avoiding the interference to other users. Cognitive radio is a key technology that came up with the solution of the problem of underutilization of radio frequency. To explore the capabilities and benefits of CR in better way, researchers now a days are interested in adaptive control paradigms such as fuzzy logic, artificial neural networks, neuro-fuzzy approach etc. The work presented in this book mainly composed of the analysis of available frequency and its allocation to the Secondary Users (SUs) / CRs by using fuzzy logic. A new approach of Spectrum management is introduced in it by resolving the issue regarding the allocation of bandwidth to the appropriate secondary user or the cognitive radio which can use the frequency band for its transmission.
Cognitive radio has been found to be the technology to satisfy the huge demand for applications of high data rates that increase the number of users in wireless networks. Cognitive radio is a very interdisciplinary topic as it includes dynamic spectrum access and policies, flexible system architectures, learning, context awareness and cooperative networking. However, most of the current cognitive radio work targets spectrum sensing and spectrum allocation without considering the impact of optimization on the performance of the network. Mitola's vision intended to build context-sensitive smart radios that are able to adapt to the wireless environment conditions while maintaining quality of service support for different applications. In this book, we study cognitive radio from a system point of view focusing closely on architectures, techniques and algorithms that can enable intelligent operations for spectrum allocation and radio reconfiguration optimization. A modular cognitive resource management framework is investigated, which facilitate a development of flexible control and optimization techniques for resources management in wireless networks on diverse radio environments.
Multicarrier communication methods such as Orthogonal Frequency Division Multiplexing (OFDM) and Filter Bank Multicarrier (FBMC) permit the implementation of dynamic spectrum access thanks to their ability to finely control signal transmission over specific frequency subbands. Therefore, multicarrier methods are strong candidates for the physical layer of spectrum sharing applications and cognitive radios. This dissertation explores methods for spectrum awareness and opportunistic access of multicarrier radios based on the allocation of subcarriers in blank spectral spaces. Following a theoretical description, a physical layer hardware design based on FPGA is presented, including the description of a working prototype with solutions to the tasks of spectrum sensing, frame detection, synchronization, channel estimation, demodulation, and mutual interference mitigation.