Mobile radio

Xem 1-20 trên 173 kết quả Mobile radio
  • 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.

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  • The Mobile Radio Propagation Channel. Second Edition. J. D. Parsons Copyright & 2000 John Wiley & Sons Ltd Print ISBN 0-471-98857-X Online ISBN 0-470-84152-4 The Mobile Radio Propagation Channel The Mobile Radio Propagation Channel. Second Edition. J. D. Parsons Copyright & 2000 John Wiley & Sons Ltd Print ISBN 0-471-98857-X Online ISBN 0-470-84152-4 The Mobile Radio Propagation Channel Second Edition J. D.

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  • Parametrization – a Technique for SDR Implementation Friedrich Jondral University of Karlsruhe Mobile communications is mainly a service driven business. But there are important marginal conditions from physics and technology that may not be ignored when developing a mobile communications system; the frequency spectrum is a scarce resource. Therefore terminals, mobile as well as base station transceivers, have to work efficiently with respect to spectrum. Mobile radio channels are complicated due to multipath propagation, reflections, scattering, time, or frequency dispersion, etc. ...

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  • The GSM Recommendation The early 1980s were marked by the development of a number of national and incompatible radio networks in Europe; see Table 1.2 and Figure 1.3. The seven different mobile radio networks made the prospect of the mobile telephone unattractive to many potential customers because of high tariffs and equipment costs. For this reason, at its general meeting in Vienna in June 1982, CEPT (see Appendix B.2.2) decided to develop and standardize a Pan-European cellular mobile radio network.

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  • During the first half of this century, the transmission of human voice through the telephone was the dominant means of communication next to telegraphy. Radio-supported mobile communication has constantly grown in importance during the last few decades and particularly the last few years to technical advances in transmission and switching technology as well as in microelectronics. Table 1.1 presents an overview of the chronological development of mobile radio systems.

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  • Dramatic developments have been taking place in the mobile radio area all over the world during the last couple of decades. Mobile communications is one of the fastest growing markets in the telecommunications area. According to projections, there will be a linear increase in the number of subscribers to the major GSM networks operated in Europe by the end of the decade. The political environment in Europe is the main reason for the rapid development.

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  • 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.

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  • Cordless Telephone Systems Cordless telephone systems are mobile radio systems that, although their transmission range is not suitable for wide-area coverage, are attractive to many users because of the services offered and their low cost. Cordless telephony (CT) can be used within the area of a subscriber line, and provides a radio link within a radius of approximately 50 m inside a building or 300 m outdoors between the fixed terminal and a mobile part.

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  • Fundamentals of Radio Transmission In mobile radio systems, unlike wired networks, electromagnetic signals are transmitted in free space (see Figure 2.1). Therefore a total familiarity with the propagation characteristics of radio waves is a prerequisite in the development of mobile radio systems. In principle, the Maxwell equations explain all the phenomena of wave propagation. However, when used in the mobile radio area, this method can result in some complicated calculations or may not be applicable at all if the geometry or material constants are not known exactly....

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  • Other Public Mobile Radio Systems 4.1 Airline Telephone Network for Public Air–Ground Communication In 1993 ETSI RES 5 submitted a standard for the Terrestrial Flight Telephone System (TFTS), specifying the radio interface and the interfaces to public telecommunications networks. At the same time the European Airlines Electronic Committee (EAEC) specified the airline equipment and interfaces to cabin facilities. Commercial operations began in 1994.

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  • Besides cellular mobile radio networks that are primarily envisaged for use outdoors, systems that have been specifically designed for use in buildings are also important. In recent years cordless telephones with a range of a few hundred metres have become increasingly popular in private households. There is (along with CT2/CAI) a digital alternative to these analogue devices that offers better voice quality and a greater security against eavesdropping, as well as other advantages: the DECT system....

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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: System-Level Performance of Antenna Arrays in CDMA-Based Cellular Mobile Radio Systems Andreas Czylwik

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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: Subband Adaptive Array for DS-CDMA Mobile Radio

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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: Downlink Space-Frequency Preequalization Techniques for TDD MC-CDMA Mobile Radio Systems

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  • GSM (Global System for Mobile Communications, originally Groupe Spécial Mobile), is a standard set developed by the European Telecommunications Standards Institute (ETSI) to describe technologies for second generation (2G) digital cellular networks. Developed as a replacement for first generation (1G) analog cellular networks, the GSM standard originally described a digital, circuit switched network optimized for full duplex voice telephony.

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  • RoF là phương pháp truyền dẫn tín hiệu vô tuyến đã được điều chế trên sợi quang. RoF sử dụng các tuyến quang có độ tuyến tính cao để truyền dẫn các tín hiệu RF (analog) đến các trạm thu phát. Mobile Host (MH): đó là các thiết bị đi động trong mạng đóng vai trò là các thiết bị đầu cuối. Các MH có thể là điện thoại đi động, máy tính xách tay có tích hợp chức năng, các PDA, hay các máy chuyên dụng khác có tích hợp chức năng truy nhập vào mạng không dây....

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  • 1) I M obile Networks O verview 2) II Radio Technologies 3) III 2G Standards 4) IV G SM Advantages over CDM A

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  • Our first chapter puts LTE into its historical context, and lays out its requirements and key technical features. We begin by reviewing the architectures of UMTS and GSM, and by introducing some of the terminology that the two systems use. We then summarize the history of mobile telecommunication systems, discuss the issues that have driven the development of LTE, and show how UMTS has evolved first into LTE and then into an enhanced version known as LTE-Advanced. The chapter closes by reviewing the standardization process for LTE....

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  • 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)].

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  • 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.

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