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<p>is the sum of two such processes.</p>

<p><big>Applicability</big></p>
<p>The requirement that there be many scatterers present means that Rayleigh fading can be a useful model in heavily built-up city centres where there is <a href="page.php?w=NLOS">no line of sight</a> between the transmitter and receiver and many buildings and other objects <a href="page.php?w=attenuation_%28electromagnetic_radiation%29">attenuate</a>, <a href="page.php?w=Reflection_%28physics%29">reflect</a>, <a href="page.php?w=refraction">refract</a>, and <a href="page.php?w=diffraction">diffract</a></p><p>
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