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Electronics & Communication Engineering Journal

Issue 2 • Date Apr 1998

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Displaying Results 1 - 5 of 5
  • Location management strategies for cellular mobile networks

    Page(s): 64 - 72
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2184 KB)  

    Location management in mobile communication systems is concerned with those network functions necessary to allow the users to be reached wherever they are in the network coverage area. The basic operations for that purpose-paging and location updating-are resource-consuming since both involve signalling over the radio link between the mobile stations and base stations. Future cellular mobile communication networks (wireless personal communication networks (PCN)) will have to support a large number of users, so a significant amount of radio signalling can be expected. This paper describes the conventional location management strategy (the one used in modern cellular systems like the Global System for Mobile communications (GSM)) and reviews, describes and comments on some alternative location management proposals for future high-density PCN environments that aim to reduce this expected high (radio) signalling load View full abstract»

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  • Realising personal satcom antennas

    Page(s): 73 - 82
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2048 KB)  

    The worldwide interest in personal mobile satellite communications using constellations of low-orbiting satellites highlights the handset antenna as a component that has a critical effect on the overall system viability. The antenna design is, however, influenced by many factors and the purpose of this overview is to identify key design aspects, their interrelation and prospects for optimisation. Fundamental engineering design issues, difficulties and trade-offs are considered first, followed by a note of research and an outline appraisal of the power budget that should be achievable. The antenna requirements are application dependent and the future customer base is conjectured upon together with suggestions for alleviating the stringent antenna design constraints View full abstract»

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  • New Opportunities, New Challenges

    Page(s): 50 - 51
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (332 KB)  

    First Page of the Article
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  • Techniques in infra-red astronomy

    Page(s): 83 - 88
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1692 KB)  

    Astronomy at the infra-red wavelengths is a comparatively recent branch of the subject, having really only started circa 1970. Since that time it has grown enormously in scope and sensitivity. This paper reviews the techniques used and problems faced by the infra-red astronomer. The topics discussed include: ground based astronomy, single element detectors, array detectors, array electronics and calibration View full abstract»

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  • A user's guide to non-volatile, on-chip analogue memory

    Page(s): 53 - 63
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1404 KB)  

    On-chip, non-volatile analogue memory is essential in hardware implementations of many of the early stages of signal processing, including neural network preprocessors and other adaptive sensor fusion amplifiers. Such storage is also desirable for trimming analogue circuits electronically and for parameter retention on power-down. This paper reviews the current state-of-the-art from a designer's perspective, highlighting the promises and problems associated with a range of approaches View full abstract»

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