Lecture5

Lecture5 - Wireless Communications Technology Noise Dr....

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EE475 DR. Kirkman Lecture 5 USC 1 Wireless Communications Technology Noise Dr. George Kirkman EE475 Fall 2006
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EE475 DR. Kirkman Lecture 5 USC 2 Noise 0 1 Detection level Signal Signal + Noise
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EE475 DR. Kirkman Lecture 5 USC 3 Random Processes Electrons in a material have a random motion with a kinetic energy proportional to temperature. Temperature is a measure of the kinetic energy of particles in random motion The mean value of the motion is zero but the rms value produces a voltage on a resistor kTBR V n 4 =
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EE475 DR. Kirkman Lecture 5 USC 4 Noise Power If the noisy resistor is matched to a conjugate load the load voltage is The noise power is 2 n l V V = kTB R V P n n = = 1 2 2
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EE475 DR. Kirkman Lecture 5 USC 5 Spectral Power Density Power / bandwidth can be expressed in dBm/Hz Look at spectrum analyzer Random noise is independent of frequency*, noise power is proportional to bandwidth Narrow bandpass filters reduce noise power dBm Hz B * At microwave frequencies = 10 12 Hz
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EE475 DR. Kirkman
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This note was uploaded on 04/09/2010 for the course EE 475 taught by Professor Kirkman during the Spring '07 term at USC.

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Lecture5 - Wireless Communications Technology Noise Dr....

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