Xem 1-20 trên 442 kết quả Wireless Systems
  • The key access technologies in current and next generation wireless systems is OFDMA. Packet scheduling plays an important role in QoS provisioning by providing mechanisms for the resource allocation

    ppt42p nhq_khtn 07-11-2013 34 2   Download

  • The mcma framework, error control theory, error control system design, conclusion as the main contents of the document "Punctured Convolutional Coding Scheme for Multi-Carrier MultiAntenna Wireless Systems". Invite you to consult.

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  • Over the past few years, many fundamental changes have taken place in wireless communications that will influence the future of this dynamic field. One phenomenon driving these changes has been the integration of wireless communicationdevices in people’s lives. While the 1990s were the years when wireless voice telephony became popular, the 2000s should be the time when wireless data applications are truly un-tethered from homes and offices.

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  • When a fiber-optic link is neither practical nor feasible, under the above scenario, wireless optical communications (WOC) becomes a real alternative, since it allows to transfer data with high-bandwidth requirements with the additional advantages of wireless systems (Arimoto, 2010; Ciaramella et al., 2009; Sova et al., 2006). Moreover, a wireless optical communication system offers, when compared with RF technology, an intrinsic narrower beam; less power, mass and volume requirements, and the advantage of no regulatory policies for using optical frequencies and bandwidth....

    pdf0p contentnew 12-04-2012 53 19   Download

  • The wireless era was started by two European scientists, James Clerk Maxwell and Heinrich Rudolf Hertz. In 1864, Maxwell presented Maxwell's equations by unifying the works of Lorentz, Faraday, Ampere, and Gauss. He predicted the propagation of electromagnetic waves in free space at the speed of light. He postulated that light was an electromagnetic phenomenon of a particular wavelength and predicted that radiation would occur at other wavelengths as well. His theory was not well accepted until 20 years later, after Hertz validated the electromagnetic wave (wireless) propagation.

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  • Flexible and scalable wide area network using satellite backhauls and configurable wireless ground access. Supports broadband multimedia applications and all-IP based mobility management.

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  • The implementation of wireless connectivity is predicated upon the definition of so-called wireless standards, of which GSM, DECT, CDPD, GPRS, and CDMA are examples [7, 8]. Each of these standards embodies the precise set of parameters that dictate the architecture and software design of wireless systems operating under the standard to effect intelligible communicationwith other systems also operating within the standard.

    pdf280p hoang1 31-10-2009 134 61   Download

  • This book provides a comprehensive introduction to the underlying theory, design techniques and analytical tools of wireless communications, focusing primarily on the core principles of wireless system design. The book begins with an overview of wireless systems and standards. The characteristics of the wireless channel are then described, including their fundamental capacity limits. Various modulation, coding, and signal processing schemes are then discussed in detail, including state-of-the-art adaptive modulation, multicarrier, spread spectrum, and multiple antenna techniques....

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  • You will understand the physical meaning behind the mathematics of wireless signals and learn the intricacies and tradeoffs in signal selection and design.

    pdf903p dangkhoa1612 18-05-2013 76 41   Download

  • 3G CDMA2000 Wireless System Engineering For a listing of recent titles in the Artech House Mobile Communications Library, turn to the back of this book.3G CDMA2000 Wireless System Engineering Samuel C. Yang Artech House, Inc. Boston • London www.artechhouse.com Library of Congress Cataloging-in-Publication Data A catalog record for this book is available from the U.S. Library of Congress. British Library Cataloguing in Publication Data Yang, Samuel C. 3G CDMA2000 wireless system engineering.—(Artech House mobile communications library) 1. Wireless communication systems. 2.

    pdf279p khinhkha 22-07-2010 64 24   Download

  • Past decade has seen a surge of research activities in the field of wireless communication. Emerging from this research thrust are new points of view on how to communicate effectively over wireless channels. The goal of this course is to study in a unified way the fundamentals as well as the new research developments. The concepts are illustrated using examples from several modern wireless systems (GSM, IS-95, CDMA 2000 1x EV-DO, Flarion's Flash OFDM, ArrayComm systems.)

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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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  • Wireless communications is one of the most active areas of research over the past and the current decades. In fact, the demand for wireless services has been changing from the regular voice telephony services to mixed voice, data, and multimedia services over the wireless media. Since the mid-1990s, the wireless industry has been advancing at an incredible speed. For example, the 2G cellular systems (such as GSM, D-AMPS, and IS-95) have significantly improved the spectral efficiency and network capacity to support wireless telephony services....

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  • Wireless communications systems offer a great deal of flexibility for mobile users and represent a key component in future global personal communications. Local loop systems are envisaged to allow the integration of many services into a high-speed digital system which allows communication inside buildings and access to the external world. Wireless systems potentially offer unprecedented flexibility for home or office data communications systems and reduced overheads costs for both installation and equipment....

    pdf25p tienvovan 18-09-2010 38 4   Download

  • In 1999, LBNL asked the area’s cellular carriers to propose a solution to the problem. Cingular Wireless (previously Cellular One and AT&T Wireless) proposed installing an InterReach in-building wireless system. After the IT staff determined that the in-building system wouldn’t interfere with sensitive scientific instruments such as electron microscopes, Cingular got the go-ahead to install it.

    pdf2p mylinh 14-08-2009 96 3   Download

  • Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: Reconfigurable parasitic antennas for compact mobile terminals in multiuser wireless systems

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  • Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Impacts of impulsive noise from partial discharges on wireless systems performance: application to MIMO precoders

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  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài:Research Article Automatic Modulation Recognition Using Wavelet Transform and Neural Networks in Wireless Systems

    pdf13p dauphong15 16-02-2012 24 3   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 W-NINE: A Two-Stage Emulation Platform for Mobile and Wireless 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

    pdf14p sting08 20-02-2012 16 3   Download

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