Wireless channels

Xem 1-20 trên 108 kết quả Wireless channels
  • 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.)

    ppt76p nhq_khtn 12-03-2011 57 13   Download

  • So far we have only looked at specific communication schemes. Information theory provides a fundamental limit to (coded) performance. It succinctly identifies the impact of channel resources on performance as well as suggests new and cool ways to communicate over the wireless channel. It provides the basis for the modern development of wireless communication.

    ppt37p nhq_khtn 12-03-2011 41 3   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....

    pdf0p huemanvdoc 20-11-2009 167 51   Download

  • Wireless communications is, by any measure, the fastest growing segment of the communications industry. As such, it has captured the attention of the media and the imagination of the public. Cellular systems have experienced exponential growth over the last decade and there are currently around two billion users worldwide. Indeed, cellular phones have become a critical business tool and part of everyday life in most developed countries, and are rapidly supplanting antiquated wireline systems in many developing countries....

    pdf572p manhtoank10c 23-05-2013 54 20   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.

    ppt31p nhq_khtn 12-03-2011 64 12   Download

  • 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....

    pdf544p gian_anh 18-10-2012 22 5   Download

  • Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: An occupancy-based and channel-aware multilevel adaptive scheme for video communications over wireless channels

    pdf17p sting03 04-02-2012 21 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: Efficient Bidirectional DFE for Doubly Selective Wireless Channels

    pdf10p dauphong20 10-03-2012 20 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 Opportunistic Multicasting Scheduling Using Erasure-Correction Coding over Wireless Channels Quang Le-Dang and Tho Le-Ngoc

    pdf17p dauphong14 13-02-2012 18 2   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 Application of the Evidence Procedure to the Estimation of Wireless Channels

    pdf23p dauphong19 07-03-2012 26 2   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: A Generalized Algorithm for the Generation of Correlated Rayleigh Fading Envelopes in Wireless Channels

    pdf15p sting11 10-03-2012 32 2   Download

  • Radio based communication, open air The attacker, having a radio transmitter and receiver with the same radio frequency of the underlying wireless network, can easily: Intercept wireless data Connect his computing devices to a nearby wireless network Inject new packets to an existing wireless network Jam a particular wireless channel using a jamming device Security measures Implement encryption algorithms, authentication algorithms, and integrity-check algorithms at the data-link layer Provide network access with wired equivalent privacy Higher-layer protocols and applications can be used ...

    ppt32p muathu_102 28-01-2013 21 2   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: An Integrated Source and Channel Rate Allocation Scheme for Robust Video Coding and Transmission over Wireless Channels

    pdf13p sting12 11-03-2012 14 1   Download

  • Electronic and wireless technologies have changed the way we do businessforever. We have seen fast paced change in the last decade not only in information technology advancement but also in business model design and strategic direction. Technology has become central to company operations as well as strategy.

    pdf286p vutrung 07-09-2009 347 109   Download

  • Đến đây bạn đã cấu hình xong phần căn bản, bây giờ chúng ta chuyển sang bảo mật cho Wireless Router để ngăn ngừa các truy cập trái phép. Trên giao diện web đang mở, bạn vào Menu Wireless và chọn tab Basic Wireless Settings. Trong phần Network Mode bạn chọn chế độ Mixed để Wireless Router có thể phát sóng ở tất các chuẩn nó được hỗ trợ. Tiếp theo đến mục Network Name, đây chính là tên SSID của Wireless Router, bạn nên đặt một tên gợi nhớ.

    pdf10p xmen1357 05-01-2011 90 47   Download

  • A wireless local area network (WLAN) is exactly like a regular local area network (LAN), except that each computer in the WLAN uses a wireless device to connect to the network. Computers in a WLAN share the same frequency channel and SSID, which is an identification name shared by the wireless devices belonging to the same wireless network.

    pdf3p duypha 10-08-2009 131 20   Download

  • page 3 Review of Stochastic Processes and Random Variables. Review of Discrete-Time Signal Processing. Components of a Digital Communication System. OFDM WLAN Overview. Single Carrier Versus OFDM Comparison. Chap 2 - Synchronization. page 51 Timing Estimation. Frequency Synchronization. Channel Estimation. Clear Channel Assessment. Signal Quality. Chap 3 - Modulation and Coding

    pdf275p son2483 04-11-2010 76 16   Download

  • Techniques for Effective Wireless Sniffing Understanding Wireless Card Operating Modes Configuring Linux for Wireless Sniffing Configuring Windows for Wireless Sniffing Using Wireless Protocol Dissectors Useful Wireless Display

    pdf104p sakuraphuong 16-05-2013 33 10   Download

  • Wireless mesh networks (WMNs) have recently received a great deal of attention as a promising cost-effective solution to provide coverage and broadband wireless connectivity for mobile users to get access to different IP applications and services. The factor that has helped WMNs become attractive is the wide application prospects from the wireless community, home and enterprise networking.

    pdf260p orchid_1 17-09-2012 38 8   Download

  • 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 37 7   Download

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