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DTSTART:20091008T160000
SUMMARY:ECE Colloquium (500): "Free Space Propagation and Thermal Noise"
DESCRIPTION:<p><strong>Abstract:</strong><br />Signal propagation and noise form the basis of communication system performance. Although propagation is generally more complex than that in free space and noise may have non-thermal contributions, there are interesting, often overlooked points to discuss about free space propagation and thermal noise. Surprisingly the two topics are related by the concept of effective aperture.</p>
<p>We will consider: 
<ul>
<li>What is antenna effective area and why is it proportional to l<sup>2</sup>? </li>
<li>Why propagation (the Friis equation) has both a <em>distance</em> and a <em>frequency</em> component </li>
<li>The impedance of free space is generally considered to be 377 ohms. How is this computed, and what does it mean for antennas?</li>
<li>How is circuit noise related to black body radiation?</li>
<li>Why sky noise appears &ldquo;white&rdquo; when the black body curve has a bump</li>
<li>Why is the noise power from a resistor not infinite?</li>
<li>Why -174 dBm/Hz + Noise Figure is only an approximation</li>
<li>Why can we still see the noise left over from the Big Bang?</li>
</ul>
</p>
<p><strong>Biography:</strong><br />Rob Gilmore serves as Vice President, ASIC Engineering in Qualcomm&rsquo;s Corporate Research and Development. He has more than 30 years of experience in engineering, communication systems design, and development. He is currently involved in a number of programs, including project engineer of an ultrawideband impulse radio, semiconductor roadmap, and healthcare initiatives.</p>
LOCATION:151 Everitt
UID:20091123T23544498@ece.uiuc.edu
DTSTAMP:20091123T235444
CONTACT:Naresh Shanbhag and Venu Veeravalli
CATEGORY:ECE 500
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