RF Propagation Measurement and Modelling to SupportAdept Planning of Outdoor Wireless Local Area Networks in 2.4 GHz Band
نویسنده
چکیده
-Radio Frequency (RF) propagation is the study of how radio waves broadcast over distances. One of the main problems in mobile radio communication is the loss of propagated RF signal power at the receiver due to fading. When the fading is very strong, the signal is blocked. Modeling of the signal propagation loss is an important element of the design and performance analysis of wireless communication systems.The initiative of RF propagation modeling is to devise a model that can predict the signal coverage of an access point placed at a certain location in an environment.Propagation models help network planner to estimate the signal coverage and pathloss for a given deployment plan, as well as perform automated placement of access points. This paper presents a measurement based Log-distance propagation model for effective planning of outdoorWLAN in the 2.4 GHz Band. Measurements were carried out over a distance to determine various received power levels from a fixed WLAN access pointtransmitter; these values were applied to some path loss model equations to obtain the mobile radio planning parameters such as the path loss exponent, the mean path loss intercept and AP cell range. The results obtained show that path loss exponent was 1.85 while the mean path loss intercept was mean path loss intercept 84. Hence the log model for the design of a mobile radio link in the test bed area is PL(dB) = 84+ 1.85log (d). In general, results show that the obstructions in the environment considered here had little effect (not much) on radio signals.
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