Lect11_Analog Modulation (I)

Lect11_Analog Modulation (I) - ECE 620 Introduction to RF...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture Analog Modulation (I) 11 1
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Outline AM Modulation 2
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Communication Systems Communication systems convert information into a format appropriate for the transmission medium Channels convey electromagnetic waves Modulation is the process of encoding a message signal into a carrier signal A higher carrier frequency may be needed for effective transmission (ANT size, high BW, etc…) Modulation permits frequency/time division multiplexing allowing for coexistence of multiple channels Analog communication systems convert (modulate) analog signals into modulated (RF) signals Digital communication systems covert information in the form of bits into RF signals Computers naturally generate information as bits Analog signals can be converted into bits by quantizing and digitizing. 3
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Carrier Modulation ) 2 cos( t f A c 4 Carrier Signal: Message Signal Amplitude Modulation
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This note was uploaded on 11/21/2011 for the course ECE 620 taught by Professor Khalil during the Fall '11 term at Ohio State.

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Lect11_Analog Modulation (I) - ECE 620 Introduction to RF...

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