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Percorrer por autor "Gouveia, David"

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  • Design and Implementation of IEEE 802.16 Radio Links with Relays
    Publication . Marques, Marco; Ambrósio, João; Reis, Carlos; Gouveia, David; Robalo, Daniel; Velez, Fernando José; Costa, Rui; Riscado, José
    This paper addresses aspects of design and planning of a Wireless network WiMAX (IEEE 802.16) to establish a point-to-point, PTP, link from the Health Sciences Faculty of University of Beira Interior (FCS/UBI) to Hospital Sousa Martins (Guarda), and also presents a field trial where we tested point-to-point links with pre-WiMAX equipment. The design of the link had into consideration the carrier to noise ratio, C/N, and the minimum carrier to noise ratio with fading, C/Nmin_fad. The use of two relays is needed to guarantee LoS conditions. The use of BreezeNET B equipment from Alvarion was assumed. From the dimensioning process, it was verified that with γ = 2, for the second clause, the three types of modulations can be used. Field trials results were compared with the theoretical model, and very similar conclusions were achieved.
    2007-05Documento de conferência Acesso aberto Ver mais
  • Design and Planning of IEEE 802.16 Networks
    Publication . Marques, Marco; Ambrosio, João; Reis, Carlos; Gouveia, David; Robalo, Daniel; Velez, Fernando J.; Costa, Rui; Riscado, José
    This paper addresses aspects of design of WiMAX wireless networks to establish a point-to-point, PTP, link with Alvarion BreezeNET B equipment, from the Health Sciences Faculty of University of Beira Interior to Hospital Sousa Martins (Guarda), and also presents a field trial with pre-WiMAX PTP equipment. The design of the link with relays had into consideration the carrier to noise ratio, C/N, and the minimum carrier to noise ratio with fading, C/Nminjad. From the dimensioning process, with gamma = 2, for the second clause, the three types of modulations (low to high order ones) can be used. Field trials results are similar to the ones extracted from the theoretical model. Cellular WiMAX planning and tests were also addressed and there is a need of using sectorial antennas to optimize coverage and interference.
    2007-09Documento de conferência Acesso aberto Ver mais