Xem 1-20 trên 66 kết quả Digital wireless
  • Four laws, two each from the natural sciences and the social sciences, have formed the basis for the development of digital wireless communication networks. This essay describes their interaction, as well as their logical support for spread - spectrum multiple - access techniques.

    pdf426p phongthinh 04-08-2009 301 194   Download

  • Practical Digital Wireless Signals Do you need to know what signal type to select for a wireless application? Quickly develop a useful expertise in digital modulation with this practical guide, based on the author’s experience of over 30 years in industrial design. You will understand the physical meaning behind the mathematics of wireless signals and learn the intricacies and tradeoffs in signal selection and design.

    pdf0p aries23 29-09-2012 35 13   Download

  • Wireless communications is rapidly becoming one of the ubiquitous technological underpinnings of modern society (such as electric power, fossil fuels, automobiles, etc.). Few people think about the technology within their mobile phones, remote controls, garage door openers, GPS navigation devices, and so on. They are always at hand and reliably work for the user. Yet even within the electrical engineering (EE) community, radio communication techniques have a reputation as a “Black Art” that can only be successfully practiced by “RF people”. This is changing, albeit slowly.

    pdf445p namde04 03-05-2013 26 12   Download

  • Over the last ten years, the impact of wireless communications on the way we live and do business has been surpassed only by the impact of the Internet. Cell phones, pagers, and wireless Personal Digital Assistants (PDAs) have become so commonplace in our lives that it is easy to forget that ten years ago, they were a rarity.

    pdf409p mylinh 11-08-2009 108 57   Download

  • 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

  • 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 50 20   Download

  • This course is about a communication system which is used to transfer information from a source to a destination. Examples of communication systems are telephones, wireless data access, television and many others.How to transmit the information from a source to a destination. How to evaluate the quality of the received information. What kinds of design goals to consider for a specific application. How to trade-off between various parameters (such as bandwidth and power) due to the design limitations and goals.

    pdf30p huemanvdoc 23-11-2009 93 18   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 71 15   Download

  • 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

  • Phần 1 ADSL - Asymmetric Digital Subscriber Line, phần 2 Wireless LAN là những nội dung chính trong 2 phần của bài giảng bài 06 "ADSL & Wireless LAN". Mời các bạn cùng tham khảo nội dung bài giảng để có thêm tào liệu phục vụ nhu cầu học tập và nghiên cứu.

    pdf16p theanh180 11-09-2015 11 4   Download

  • The generic cellular communication system, shown in Fig.l, is an integrated network comprising a land base wire line telephone network and a composite wired-wireless network. The land base network is the traditional telephone system in which all telephone subscribers are connected to a central switching network, commonly known as PSTN (Public Switching Telephone Network). It is a digital switching system, providing: i) Switching, ii) Billing, iii) 911 dialing, iv)l-800 and 1-900 calling features, v)...

    pdf280p tailieuvip13 20-07-2012 27 2   Download

  • In this paper, we present the results of our implementation of elliptic curve cryptography (ECC) over the field GF (p) on an 80-MHz, 32-bit ARM microprocessor. We have produced a practical software library which supports variable length implementation of the elliptic curve digital signature algorithm (ECDSA).

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  • The MSP430 microcontroller family offers ultra-low power mixed signal, 16-bit architecture that is perfect for wireless low-power industrial and portable medical applications. This book begins with an overview of embedded systems and microcontrollers followed by a comprehensive in-depth look at the MSP430. The coverage included a tour of the microcontroller's architecture and functionality along with a review of the development environment. Start using the MSP430 armed with a complete understanding of the microcontroller and what you need to get the microcontroller up and running...

    pdf685p toanddk 29-12-2011 149 61   Download

  • Cryptography is the stuff of spy novels and action comics. Kids once saved up bubble-gum wrappers and sent away for Captain Midnight’s Secret Decoder Ring. Almost everyone has seen a television show or movie involving a nondescript suit-clad gentleman with a briefcase handcuffed to his wrist. The word “espionage” conjures images of James Bond, car chases, and flying bullets.

    pdf80p batrinh 07-08-2009 185 54   Download

  • The R/3 Guide is a Frequently Given Answers book. It is a collection of answers, I have given to questions regarding EDI over and over again, both from developers, consultants and client’s technical staff. It is focussed on the technical aspect of SAP R/3 IDoc technology. It is not a tutorial, but a supplement to the R/3 documentation and training courses.

    pdf177p phongthinh 07-08-2009 445 54   Download

  • WAP, Wireless Application Protocol aims to provide Internet content and advanced telephony services to digital mobile phones, pagers and other wireless terminals. The protocol family works across different wireless network environments and makes web pages visible on low-resolution and low-bandwidth devices.

    doc5p thachnq 03-06-2011 106 20   Download

  • Thành lập từ năm 1982, Sun Microsystems hiện là công ty Mỹ đứng hàng đầu thế giới trong lĩnh vực cung cấp các giải pháp công nghệ thông tin, đặc biệt là các giải pháp trên mạng Internet.

    pdf8p hangkute_101091 13-07-2010 79 19   Download

  • We have witnessed significant advances in multimedia research and applications due to the rapid increase in digital media, computing power, communication speed, and storage capacity. Multimedia has become an indispensable aspect in contemporary daily life, and we can feel its presence in many applications ranging from online multimedia search, Internet Protocol Television (IPTV), and mobile multimedia, to social media.

    pdf0p aries23 29-09-2012 40 14   Download

  • This book follows from my first edition and is intended to provide a thorough, up to date, treatment of wireless physical communications. The book is derived from a compilation of course material that I have taught in a graduatelevel course on physical wireless communications at Georgia Tech over the past decade. This textbook differs from others on the subject by stressing mathematical modeling and analysis. My approach is to include detailed derivations from first principles.

    pdf771p trungkiendt9 16-07-2013 45 13   Download

  • The Digital Building Telecommunications Access Guideline Foreword Scope and Purpose Digital River The Process More information and comments Principle 1: Spatial Access and Design 1.1 Introduction 1.2 Communications Network Architectures 1.3 Telecommunications Service Entrance 1.4 Equipment Room 1.5 Backbone Pathways or Riser Shafts 1.6 Telecommunications closets (TC) 1.7 Horizontal pathways 1.8 Radio (Wireless) Facilities Provision 1.9 Standards & References Principle 2: Diversity 2.1 Building Entry Point (BEP) 2.2 Equipment Room 2.3 Riser Shafts 2.

    pdf56p qd-tek 28-04-2010 75 11   Download

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