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Unformatted text preview: Lecture 3 - EE 359: Wireless Communications - Fall 2011 Shadowing, Combined Path Loss/Shadowing, Coverage Area, Model Parameters. Lecture Outline • Log Normal Shadowing • Combined Path Loss and Shadowing • Outage Probability • Cell Coverage Area • Model Parameters from Empirical Data 1. Log-normal Shadowing: • Statistical model for variations in the received signal amplitude due to blockage. • The received signal power with the combined effect of path loss (power falloff model) and shadowing is, in dB, given by P r (dB) = P u (dB) + 10 log 10 K- 10 γ log 10 ( d/d ) + ψ (dB) . • Empirical measurements support the log-normal distribution for ψ : p ( ψ dB ) = 1 √ 2 πσ ψ dB exp bracketleftBigg- ( ψ dB- μ ψ dB ) 2 2 σ 2 ψ dB bracketrightBigg . • This empirical distribution can be justified by a LLN argument. • The autocorrelation based on measurements follows an autoregressive model: A ψ ( δ ) = σ 2 ψ dB e- δ/X c = σ 2 ψ dB e- vτ/X c , where X c is the decorrelation distance, which depends on the environment.is the decorrelation distance, which depends on the environment....
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- Spring '10