Spectrum access

Xem 1-20 trên 42 kết quả Spectrum access
  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Editorial Dynamic Spectrum Access for Wireless Networking

    pdf2p sting07 17-02-2012 20 4   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A Unified Approach to Optimal Opportunistic Spectrum Access under Collision Probability Constraint in Cognitive Radio Systems

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Scheduling Heterogeneous Wireless Systems for Efficient Spectrum Access

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Admission Control and Interference Management in Dynamic Spectrum Access Networks

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Opportunistic Spectrum Access in Self-Similar Primary Traffic

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  • Introduction Harri Holma and Antti Toskala Mobile Voice Subscriber Growth Mobile Data Usage Growth Wireline Technologies Evolution Motivation and Targets for LTE Overview of LTE 3GPP Family of Technologies Wireless Spectrum New Spectrum Identified by WRC-07 LTE-Advanced LTE Standardization Antti Toskala Introduction Overview of 3GPP Releases and Process LTE Targets LTE Standardization Phases Evolution Beyond Release 8 LTE-Advanced for IMT-Advanced LTE Specifications and 3GPP Structure References System Architecture Based on 3GPP SAE Atte Länsisalmi and Antti Toskala System Architecture E...

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  • In the latest years much research effort was devoted to envision a new paradigm for wireless transmission. Results from recent works (Wireless Word Research Forum, 2005) indicate that a possible solution would lie in utilizing in a more efficient manner the diverse Radio Access Technologies1 (RATs) that are available nowadays, with the purpose of enabling interoperability among them and convergence into one global telecom infrastructure (beyond 3G).

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  • Enable many mobile users to share simultaneously radio spectrum. Provide for the sharing of channel capacity between a number of transmitters at different locations. Aim to share a channel between two or more signals in such way that each signal can be received without interference from another.

    ppt60p nhq_khtn 12-03-2011 36 7   Download

  • When the first edition of WCDMA for UMTS was published by John Wiley & Sons, Ltd 6 years ago (in April 2000), 3GPP had just completed the first set of wideband CDMA (WCDMA) specifications, called ‘Release 99’. At the same time, the Universal Mobile Telecommunication Services (UMTS) spectrum auction was taking place in Europe. UMTS was ready to go.

    pdf259p hoanglammta 22-09-2010 229 134   Download

  • The third generation (3G) mobile communication system is the next big thing in the world of mobile telecommunications. The first generation included analog mobile phones [e.g., Total Access Communications Systems (TACS), Nordic Mobile Telephone (NMT), and Advanced Mobile Phone Service (AMPS)], and the second generation (2G) included digital mobile phones [e.g., global system for mobile communications (GSM), personal digital cellular (PDC), and digital AMPS (D-AMPS)].

    pdf568p nhq_khtn 12-03-2011 97 38   Download

  • An Ad-hoc network or Independent Basic Service Set (IBSS) is a simple network where communications are established between two or more wireless nodes or Stations ( STAs) in a given coverage area without the use of an Access Point (AP) or server. The STAs recognize each other and communicate directly with each other on a peer-to-peer level.

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  • Cognitive radio is a hot research area for future wireless communications in the recent years. In order to increase the spectrum utilization, cognitive radio makes it possible for unlicensed users to access the spectrum unoccupied by licensed users. Cognitive radio let the equipments more intelligent to communicate with each other in a spectrum-aware manner and provide a new approach for the co-existence of multiple wireless systems.

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  • The growth in the use of mobile networks has come mainly with the third generation systems and voice traffic. Withthe current third generation and the arrival of the 4G, the number of mobile users in the world will exceed the number of landlines users. Audio and video streaming have had a significant increase, parallel to the requirements of bandwidth and quality of service demanded by those applications. Mobile networks require that the applications and protocols that have worked successfully in fixed networks can be used with the same level of quality in mobile scenarios.

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  • This book is published in print and online through the online OAPEN library (www.oapen.org). OAPEN (Open Access Publishing in European Networks) is a collaborative initiative to develop and implement a sustainable Open Access publication model for academic books in the Humanities and Social Sciences. The OAPEN Library aims to improve the visibility and usability of high quality academic research by aggregating peer reviewed Open Access publications from across Europe.

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  • Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010, Article ID 598707, 11 pages doi:10.1155/2010/598707 Research Article Time-Frequency Spectrum Sharing Scheme for Next Generation OFDM Systems Ayman Khalil, Matthieu Crussi` re, and Jean-francois H´ lard e ¸ e European University of Brittany (UEB) and Institute of Electronics and Telecommunications of Rennes (IETR), INSA, 20 Avenue des Buttes de Co¨smes, 35708 Rennes, France e Correspondence should be addressed to Ayman Khalil, ayman.khalil@insa-rennes.

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  • Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011, Article ID 980805, 15 pages doi:10.1155/2011/980805 Research Article Optimal Multitaper Wigner Spectrum Estimation of a Class of Locally Stationary Processes Using Hermite Functions Maria Hansson-Sandsten (EURASIP Member) Mathematical Statistics, Centre for Mathematical Sciences, Lund University, P.O. Box 118, 221 00 Lund, Sweden Correspondence should be addressed to Maria Hansson-Sandsten, sandsten@maths.lth.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Medium Access in Spread-Spectrum Ad Hoc Networks with Multiuser Detection

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  • The performance of current transport systems is inadequate when viewed in terms of economic efficiency, sustainability, and safety. Towards Better Performing Transport Networks examines the tools that are necessary to effectively measure these systems and those that are required to improve them. Utilising advanced tools of network analysis, the contributors challenge various pieces of conventional wisdom and in particular the view that intermodal transport is more environmentally benign than road transport.

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  • Wideband Code Division Multiple Access uses direct sequence spread-spectrum technology to transmit a number of independent conversations across 5MHz segments of the radio spectrum.

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  • Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài : Fair greening of broadband access: spectrum management for energy-efficient DSL networks

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