Path loss models

50 %
50 %
Information about Path loss models

Published on March 29, 2014

Author: nguyenminhthu1



path loss models

EE161 Handout #3 March 31, 2009 EE161 Spring 2009 Wireless Communications Path Loss Models The transmitted signal s(t) = u(t)ej(2πft+φ0) , where u(·) is a complex baseband signal, f is the carrier frequency and φ0 is a random initial phase (uniformly distributed between 0 and π). Basic propagation mechanisms 1. Reflection 2. Diffraction 3. Scattering Free space loss The received signal r(t) = u(t) λ √ GtGrej 2πd λ 4πd , where d is the distance, Gt and Gr are the transmit and receive antenna power gains and λ is the wavelength. The received power Pr = Pu λ 4πd 2 GtGr. 1

Ground reflection – Two-path model See figure 2.4 of Goldsmith. r(t) = λ 4π GtGr  u(t)ej 2πd ′ λ d′ + u(t + τ)Rej 2πd ′′ λ d′′   , (1) where d ′ is the LOS distance, d ′′ is the ground reflected distance, τ = d ′′ −d ′ c is the path delay and R = sin θ − √ ǫr − cos2θ sin θ + √ ǫr − cos2θ , for horizontal polarization and R = sin θ − √ ǫr − cos2θ/ǫr sin θ + √ ǫr − cos2θ/ǫr , where θ is the angle of reflection. For d > dc = 4hthr λ , we have Pr ≈ GtGr(hthr)2 d4 Pu, i.e., the signal decays as d−4. For all values of d a reasonable approximation is Pr ≈ GtGrd2 0 d2(1 + (d/dc)2q)1/q Pu, for some values of q and d0. General ray tracing r(t) = λ 4π GtGr  u(t)ej 2πl λ l + i∈all paths u(t + τi)Riej 2πli λ li   . Simplified path loss model Pr = PuK d0 d γ , with γ often between two and six. 2

Log-normal shadowing 10 log10 Pr Pu = 10 log10 K − 10γ log10 d d0 + ψdb, where ψdb is a zero-mean Gaussian random variable. 3

Add a comment

Related presentations

Discrete element method modelling (DEM) has proven over many years to be a powerfu...

Segregation Testing to confirm packer isolation and well integrity. Monitor w...

A small presentation of History matching and a case study on it. Also on Gas mater...

Manual 2 pavco cad

Manual 2 pavco cad

November 2, 2014


Tire sua duvidas a respeito da implementação da NR 12 Converse com um especialis...

Related pages

Helsinki University of Technology: Echo Path Loss - Aalto

S-72.333 Physical layer methods in wireless communication systems Path loss Models Slide 2 HELSINKI UNIVERSITY OF TECHNOLOGY SMARAD Centre of Excellence
Read more

Radio Propagation Models - Harvard University

From Wireless Communication. Radio Propagation Models Contents. Introduction; Path Loss: models of "large-scale effects" Free space loss; Plane earth loss ...
Read more

Path loss - Wikipedia, the free encyclopedia

Path loss (or path attenuation) is the reduction in power density (attenuation) ... Log-distance path loss model; 2-Ray Ground Reflection Model; References
Read more

Path Loss - WirelessCommunication.NL

Path Loss Path loss models describe the signal attenuation between a transmit and a receive antenna as a function of the propagation distance and other ...
Read more

Path loss models, Giacinto Gelli « Wireless Networks ...

Outline. Introduction to multipath propagation Channel variability. Path loss/shadowing/multipath fading; Path loss models. Free-space model; Two-ray model
Read more

Log-distance path loss model - Wikipedia, the free ...

The log-distance path loss model is a radio propagation model that predicts the path loss a signal encounters inside a building or densely populated areas ...
Read more

Path Loss Models for LTE and LTE-A Relay Stations

B5f model was developed by IST-WINNER II project [9]. WINNER models cover a wide range of propagation scenarios. Path loss models for the various WINNER
Read more

Comparison of Empirical Propagation Path Loss Models for ...

Comparison of Empirical Propagation Path Loss Models for Fixed Wireless Access Systems V.S. Abhayawardhana∗, I.J. Wassell†,D.Crosby ‡, M.P. Sellars ...
Read more

Path Loss Models | Webdemo | Institute of ...

Webdemo about 'Path Loss Models', 'for wireless link budget and coverage planning' from Institute of Telecommunications, University of Stuttgart.
Read more

Path Loss - University of Texas at Dallas

Linear Path Loss Suppose s(t) of ... Simplified Path Loss Model ... in conjunction with antenna gains and path losses, determines the fade margin ...
Read more