Transcription of Path-loss and Shadowing (Large-scale ... - 國立臺灣大學
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Path-loss and Shadowing (Large-scale ... - 國立臺灣大學
path - loss and Shadowing (Large-scale Fading)PROF. MICHAEL TSAI2011/10/20 FriisFormulaTX AntennaEIRP= Power spatial density 14 RX Antenna = 4 2 Antenna Aperture Antenna Aperture=Effective Area Isotropic Antenna s effective area , Isotropic Antenna s Gain=1 = Friis Formula becomes: = ! = ! 3 = 4 FriisFormula ! is often referred as Free-Space path loss (FSPL) Only valid when d is in the far-field of the transmitting antenna Far-field: when ! > !#, Fraunhofer distance !#= $ , and it must satisfies !
Urban area cellular radio 2.7-3.5 Shadowed urban cellular radio 3-5 Inbuilding LOS 1.6 to 1.8 Obstructed inbuilding 4 to 6 Obstructed in factories 2to 3. Empirical Path-Loss Model
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