Xem 1-20 trên 147 kết quả Radio access
  • The telecom industry is on the rebound and the demand for more and newer wireless services is ever increasing. To meet these market demands, wireless providers have to deploy advanced radio access networks to enhance the mobile communications infrastructure. This forward-looking book delivers a comprehensive overview of the evolution of mobile radio access networks, focusing on high-level architectural issues that engineers and managers need to understand.

    pdf263p transang5 23-11-2012 29 8   Download

  • During the past years, there has been a quickly rising interest in radio access technologies for providing mobile as well as nomadic and fixed services for voice, video, and data. The difference in design, implementation, and use between telecom and datacom technologies is also getting more blurred.

    pdf651p nguyenan122 09-10-2013 38 11   Download

  • 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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  • 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).

    pdf156p namde01 11-04-2013 21 9   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 Assessment of Network Layouts for CDMA Radio Access

    pdf11p sting08 20-02-2012 12 2   Download

  • [*] Wireless Access Point - Phương pháp triển khai. TRIỂN KHAI LẮP ĐẶT WIRELESS ACCESS POINT Trong quá triển khai mạng không dây, việc xác định vị trí và lắp đặt Wireless Access Point là một trong những yếu tố quan trọng quyết định đến tốc độ và sự ổn định của mạng. Nó không giống như chúng ta triển khai một mạng LAN thông thường vì công nghệ không dây truyền tín hiệu dựa trên sự truyền phát tín hiệu radio. ...

    pdf6p luvpro 12-08-2010 143 65   Download

  • As stated in Chapter 1, Section 1.2, requirements for International Mobile Telecommunications-2000 (IMT-2000) include system flexibility, economy and conditions on data transmission speed defined in numerical terms. The minimum performance requirement in terms of transmission speed is 2 Mbit/s in an indoor environment, 384 kbit/s in a pedestrian mode and 144 kbit/s in a vehicle mode.

    pdf133p tienvovan 18-09-2010 74 33   Download

  • .LTE for UMTS – OFDMA and SC-FDMA Based Radio Access LTE for UMTS: OFDMA and SC-FDMA Based Radio Access Edited by Harri Holma and Antti Toskala © 2009 John Wiley & Sons, Ltd. ISBN: 978-0-470-99401-6 .LTE for UMTS – Edited by OFDMA and SC-FDMA Based Radio Access Harri Holma and Antti Toskala both of Nokia Siemens Networks, Finland John Wiley & Sons, Ltd .This edition first published 2009 © 2009 John Wiley & Sons Ltd.

    pdf450p hoagiay_123 22-04-2013 44 22   Download

  • Ultra-Wideband Radio (UWB) earmarks a new radio access philosophy and exploits several GHz of bandwidth. It promises high data rate communication over short distances as well as innovative radar sensing and localization applications with unprecedented resolution. Fields of application may be found, among others, in industry, civil engineering, surveillance and exploration, for security and safety measures, and even for medicine.

    pdf512p haiduong_1 15-04-2013 53 17   Download

  • 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...

    pdf450p hoagiay_123 22-04-2013 30 15   Download

  • Visions for systems beyond 3G foresee software defined radio as one of the core enablers of seamless service provision across the boundaries of different wireless transmission platforms. Such visions (e.g. [1]), assume the use of different types of network [2] ranging from fixed (e.g. xDSL) connections via short range wireless (PAN/VAN/HAN) schemes, wireless LANs and cellular radio networks to broadcast systems and beyond. Accessing such a variety of different networks will require highly flexible mobile terminals – a capability expected to be provided by software defined radios....

    pdf26p vaseline 30-08-2010 65 12   Download

  • This book explains the basic components, technologies used, and operation of IS-95 CDMA systems. You will discover why mobile telephone service providers have upgraded from 1st generation analog systems to more efficient and feature rich 2nd generation system. You will also discover how 2nd generation systems are gradually evolving into 3rd generation broadband multimedia systems. This book starts with the system components and basic services that the IS-95 CDMA system can provide.

    pdf192p beobobeo 01-08-2012 35 11   Download

  • 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.

    pdf348p kimngan_1 05-11-2012 35 11   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 35 7   Download

  • Trunked Mobile Radio and Packet Data Radio In addition to the public radio telephone service and the paging service, there are other radio services that are not accessible by the public. These radio systems, called the non-public land mobile radio network , have access to frequencies that cannot be used by the public but only by specific users or groups of users.

    pdf74p huggoo 20-08-2010 48 5   Download

  • 10 Wireless Local Loop Systems Wireline communications networks are expensive and time-consuming to configure. Growing demand for telecommunications services and the imminent liberalization of the telecommunications market in Europe have greatly increased the interest in radio-based communication (Wireless Local Loops, WLL), also referred to as Radio in the Local Loop (RLL), see [3]. Future competitors of telecommunications monopoly service providers, such as power suppliers who already have their own wide-area networks, will usually lack access networks to the end users....

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  • One of the greatest challenges facing mobile operators today is reducing the cost of the backhaul portion of their network, while increasing reliability and revenue generating opportunities. Additionally, mobile operators need to be sure that the backhaul transport solution is capable of addressing the traditional 1 and 2G-based Radio Access Networks (RANs) as well as the 3G-based RANs. The number of 3G-based RANs will grow driven by new services with higher bandwidth that enable end-users to get broadband access through their mobile devices....

    pdf4p halanh 14-08-2009 47 4   Download

  • Following chapter introduces the mobile communication, gives a short history of wireless communication evolution, and highlights some application scenarios predestined for the use of mobile devices. Cellular and wireless based systems related to different generations of mobile communication, including GSM, IS-95, PHS, AMPS, D-AMPS, cdma2000 and WCDMA are also described by this Chapter. Much attention in this chapter is given to express the wireless based networks, such as Wi-Fi and WiBro/WiMax, and wireless broadcasting systems, including DMB, DVB-H, and ISDB-T.

    pdf283p tailieuvip13 20-07-2012 26 3   Download

  • The Future is Wireless A Typical Day in the Year 2000 Joe Mobilus is a manager with a haulage firm in a city 100 km away from his home town; his wife Sue is a nurse at the local hospital. Their son Tom and daughter Ann are still at school. 06:30 The central alarm system wakes Joe and Sue in line with their weekly schedule. 07:00 Joe uses his TETRA terminal to access his firm’s central computer to see if there have been any changes to his diary. 07:15 Joe leaves his house and using his cellular phone in the...

    pdf4p huggoo 20-08-2010 29 2   Download

  • Enhanced Uplink, cũng đôi khi được gọi là HSUPA hoặc High Speed ​​Uplink Packet Access, đã được giới thiệu trong 3GPP phát hành 6 (hoàn thành năm 2005) để bổ sung cho HSDPA và cải thiện hơn nữa WCDMA dữ liệu gói hỗ trợ, tập trung vào đường lên, điện thoại di động đầu cuối mạng, chỉ đạo.

    pdf26p myngoc3 17-09-2011 22 2   Download

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