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Browsing by Issue Date, starting with "2005-05"

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  • Mobile Broadband Systems: Research and Visions
    Publication . Velez, Fernando J.; Dinis, Manuel; Ferandes, José
    This article gives an overview of the European research on Mobile Broadband System (MBS), whose features range from WLANs type scenarios, allowing low mobility and medium data rates, up to public cellular MBS, whre high mobility and data rates are foreseen, leading to plain ubiquity. Current trends in 4G systems are described leading to the defintion of the MBS concept. Owing to high transmission data rate and spectrum limitations at lower frequency bands, MBS intend also to operate at millimetrewave frequency bands, namely the 40 and 60 GHz, offering improves system capacity. The MBS concept and the Trail Platform developed in the framework of the European ACTs-SAMBA and RACE-MBS projects are presented. Cellular planning aspects are discussed including a comparison between the 40 GHz and 60 GHz frequency bands, considering services and applications, tele-traffic, and MBS optimisation based on economics aspects. Field trails resutls on the radio interface performance are presented, demonstrating MBS cellular operation feasibility at millimetrewave frequency bands.
    2005-05Journal article Open access Show more
  • A WLAN planning tool with a practical approach
    Publication . Tomé, Ricardo; Lourenço, Pedro; Grilo, António; Cercas, Francisco; Rodrigues, António; Velez, Fernando José; Sebastião, Pedro
    This paper presents a new planning tool that facilitates the design and implementation of a WLAN (wireless local area network) which not only provides an accurate solution, but it also gives practical and useful information for the professional planner towards a quick implementation, such as the number and position of the access points (AP) or an estimation of the total cost of implementation based on data provided by different equipment manufacturers. The novelty of this tool is a new algorithm for calculating the best position of each AP was used, which is based on the user’s applications and their most probable positions. This tool is user friendly and it interactively helps WLAN designers to properly define all the necessary equipment so as to provide a given coverage, i.e. with a given quality of service, for a given floor plant without to make a site survey in the places where this networks will be implemented.
    2005-05Conference object Open access Show more