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<html><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><!--Converted with jLaTeX2HTML 2002 (1.62) JA patch-1.4patched version by:  Kenshi Muto, Debian Project.LaTeX2HTML 2002 (1.62),original version by:  Nikos Drakos, CBLU, University of Leeds* revised and updated by:  Marcus Hennecke, Ross Moore, Herb Swan* with significant contributions from:  Jens Lippmann, Marek Rouchal, Martin Wilck and others --><HTML><HEAD><TITLE>18. Radio Propagation Models</TITLE><META NAME="description" CONTENT="18. Radio Propagation Models"><META NAME="keywords" CONTENT="everything"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"><META NAME="Generator" CONTENT="jLaTeX2HTML v2002 JA patch-1.4"><META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"><LINK REL="STYLESHEET" HREF="everything.css" tppabs="http://www.isi.edu/nsnam/ns/doc/everything.css"><LINK REL="next" HREF="node223.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node223.html"><LINK REL="previous" HREF="node195.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node195.html"><LINK REL="up" HREF="node29.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node29.html"><LINK REL="next" HREF="node216.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node216.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html4569"  HREF="node216.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node216.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html4563"  HREF="node29.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node29.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html4557"  HREF="node214.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node214.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html4565"  HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html"><IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="file:/usr/share/latex2html/icons/contents.png"></A> <A NAME="tex2html4567"  HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html"><IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="file:/usr/share/latex2html/icons/index.png"></A> <BR><B> Next:</B> <A NAME="tex2html4570"  HREF="node216.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node216.html">18.1 Free space model</A><B> Up:</B> <A NAME="tex2html4564"  HREF="node29.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node29.html">2 Simulator Basics</A><B> Previous:</B> <A NAME="tex2html4558"  HREF="node214.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node214.html">17.4 Commands at a</A> &nbsp <B>  <A NAME="tex2html4566"  HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>  &nbsp <B>  <A NAME="tex2html4568"  HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H1><A NAME="SECTION031500000000000000000"></A><A NAME="chap:propagation"></A><BR>18. Radio Propagation Models</H1><P>This chapter describes the radio propagation models implemented in .These models are used to predict the received signal power ofeach packet. At the physical layer of each wireless node, there is a receivingthreshold. When a packet is received, if its signal power is below the receivingthreshold, it is marked as error and dropped by the MAC layer.<P>Up to now there are three propagation models in , which are the freespace model<A NAME="tex2html42"  HREF="footnode.html#foot8776" tppabs="http://www.isi.edu/nsnam/ns/doc/footnode.html#foot8776"><SUP>18.1</SUP></A>, two-ray ground reflection model<A NAME="tex2html43"  HREF="footnode.html#foot8777" tppabs="http://www.isi.edu/nsnam/ns/doc/footnode.html#foot8777"><SUP>18.2</SUP></A> and the shadowing model<A NAME="tex2html44"  HREF="footnode.html#foot8778" tppabs="http://www.isi.edu/nsnam/ns/doc/footnode.html#foot8778"><SUP>18.3</SUP></A>. Their implementation can be found in propagation.{cc,h},tworayground.{cc,h} and shadowing.{cc,h}. This documentationreflects the APIs in ns-2.1b7.<P><BR><HR><!--Table of Child-Links--><A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A><UL><LI><A NAME="tex2html4571"  HREF="node216.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node216.html">18.1 Free space model</A><LI><A NAME="tex2html4572"  HREF="node217.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node217.html">18.2 Two-ray ground reflection model</A><LI><A NAME="tex2html4573"  HREF="node218.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node218.html">18.3 Shadowing model</A><UL><LI><A NAME="tex2html4574"  HREF="node219.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node219.html">18.3.1 Backgroud</A><LI><A NAME="tex2html4575"  HREF="node220.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node220.html">18.3.2 Using shadowing model</A></UL><BR><LI><A NAME="tex2html4576"  HREF="node221.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node221.html">18.4 Communication range</A><LI><A NAME="tex2html4577"  HREF="node222.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node222.html">18.5 Commands at a glance</A></UL><!--End of Table of Child-Links--><BR><HR><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>

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