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Electronics & Communication Engineering Journal

Issue 1 • Date Feb. 2002

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Displaying Results 1 - 5 of 5
  • An overview of EGPRS: the packet data component of EDGE

    Page(s): 21 - 38
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1532 KB)  

    The explosive growth of the Internet and the subsequent demand for wireless data communications have led to data services being a major component in the standardisation process of many cellular mobile radio systems across the world. In GSM, the standardisation of the first phase of a new data service, initiated by the European Telecommunications Standards Institute (ETSI) and collectively known as Enhanced Data rates for GSM Evolution (EDGE), was finalised in 1999. The Enhanced Circuit Switched Data (ECSD) and Enhanced General Packet Radio Service (EGPRS) components of EDGE will enhance the existing GSM circuit-switched and packet-switched data services, respectively. This paper provides an overview of EGPRS and its performance. View full abstract»

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  • Resilience for IP-over-DWDM backbone networks

    Page(s): 39 - 48
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (935 KB)  

    Given the extensive growth in Internet traffic and increasing emphasis on service quality, one of the most crucial elements of IP backbone network design is to provide resilience to serious failures such as fibre-optic cable breaks. In previous years, the unit of bandwidth granularity for many IP backbone networks has grown from STM-1 (155 Mbit/s) through to STM-16 (2.4 Gbit/s), with STM-64 (10 Gbit/s) backbone circuits becoming prevalent. The increased concentration of traffic makes the IP backbone extremely vulnerable to failure, meaning a key challenge is to engineer embedded resilience into the network. This paper considers such issues and discusses various trade-offs associated with different levels of protection in an IP backbone network View full abstract»

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  • Digital Radio Mondiale: key technical features

    Page(s): 4 - 14
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1055 KB)  

    Digital Radio Mondiale (DRM) is a system that promises to reinvigorate the use of the broadcasting bands below 30 MHz. It offers a dramatic improvement in audio quality, not only improving the audio bandwidth and signal-to-noise ratio, but also countering the effects of selective fading and audible interference from other stations. It is also designed to support various features that will make receiver operation more user-friendly. This article describes the basic 'mechanics' of DRM and its features, which include station identification, alternative frequency lists and support for time-varying frequency schedules-of particular importance in HF broadcasting View full abstract»

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  • Wideband receiver for Digital Radio Mondiale

    Page(s): 15 - 20
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (723 KB)  

    Broadcasting within the traditional AM bands is set to change with the introduction of digital broadcasts. Wideband receiver architectures allow many of the advanced functions of standards such as Digital Radio Mondiale to be implemented and upgraded without changing the hardware. This article describes some of the design issues of wideband receivers and the performance of a practical receiver View full abstract»

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