Resumo

CORREA A, Cristian; GODOY S, Rodrigo; GROTE H, Walter  e  ORELLANA F, Manuel. EVALUACIÓN DE ENLACES INALÁMBRICOS URBANOS USANDO PROTOCOLO IEEE 802.11b. Rev. Fac. Ing. - Univ. Tarapacá [online]. 2005, vol.13, n.3, pp. 38-44. ISSN 0718-1337.  doi: 10.4067/S0718-13372005000300006.

In this publication a link loss prediction model for fixed outdoor urban wireless WiFi communications using the 2.45 GHz frequency band based on the Okumura-Hata model is proposed. The model evaluates the expected path losses using a modified Okumura’s prediction model and eye inspection of the link to determine the degree of obstruction. Results are checked against experimental data to find that in 90% of the studied links it is accurate within a 5 dB margin. We also analyze the coherence time of these links by performing long term measurements of the received signal.

Palavras-chave : Link loss prediction model; IEEE 802.11b protocol; channel coherence time.