2025-L23 - ECE-2025 Spring-2009 The way communication...

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ECE-2025 Spring-2009 Lecture 23 Amplitude Modulation (AM) 10-Apr-09 The way communication ystems work systems work ow do we share How do we share bandwidth ? 4/9/2009 ECE-2025 Spring-09 jMc 2 Frequency Allocation (Govt) http://www.ntia.doc.gov/osmhome/allochrt.pdf 4/9/2009 ECE-2025 Spring-09 jMc 3 fo: Lab and HW Info: Lab and HW ab 2 uring the last week ± Lab #12-B during the last week ± Interference Removal from Electrocardiograms ± Done completely in-Lab ± GRADES: ± T-square is the OFFICIAL gradebook ± Quiz #3 will be 17-April (Friday) ± Coverage: HW #10, 11 and 12 ± Chapters 9, 10, and 11 ± Review Session, 16-April, Thursday @ 6:00pm 4/9/2009 ECE-2025 Spring-09 jMc 4 Lecture
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op Quiz Pop Quiz ? ) 1 ( ) ( 2 = + t t u e t δ ( ) ? ) 1 ( ) ( 2 = + t t u e t 2 t t ( ) ? ) 1 ( ) ( = dt t t u e 4/9/2009 ECE-2025 Spring-09 jMc 5 Lecture ECTURE OBJECTIVES LECTURE OBJECTIVES eview of FT properties ± Review of FT properties ± Convolution <--> multiplication requency shifting ± Frequency shifting inewave Amplitude Modulation ± Sinewave Amplitude Modulation ± AM radio requency ivision multiplexing ± Frequency-division multiplexing ± FDM eading: Chapter 12 Section 12 4/9/2009 ECE-2025 Fall-03 jMc 6 ± Reading: Chapter 12, Section 12-2 able of Easy FT Properties Table of Easy FT Properties Linearity Property ax 1 ( t ) + bx 2 ( t ) aX 1 ( j ω ) + bX 2 ( j ) elay Property x ( t t ) e j t d X ( j ) Delay Property d j t Frequency Shifting x ( t ) e 0 X ( j ( ω−ω 0 )) t Scaling 4/9/2009 ECE-2025 Fall-03 jMc 7 x ( at ) 1 | a | X ( j ( a )) able of FT Properties Table of FT Properties x ( t ) h ( t ) H ( j ) X ( j ) x ( t ) p ( t ) 1 2 π X ( j ) P ( j ) x ( t ) e j 0 t X ( j (
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This note was uploaded on 01/27/2011 for the course ECE 2025 taught by Professor Juang during the Spring '08 term at Georgia Tech.

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2025-L23 - ECE-2025 Spring-2009 The way communication...

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