Mixers_and_Modulation

Mixers_and_Modulation - Wireless Communications Technology...

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EE475 DR. Kirkman Lecture 10 USC 1 Wireless Communications Technology Mixers and Modulation Dr. George Kirkman EE475 Fall 2006
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EE475 DR. Kirkman Lecture 10 USC 2 Frequency Translation ( 29 ( 29 ) cos( 2 1 ) cos( 2 1 ) cos( ) cos( t t t t LO RF LO RF LO RF ϖ + + - = ) cos( t RF ) cos( t LO ( 29 ( 29 ) cos( 2 1 ) cos( 2 1 t t LO RF LO RF + + -
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EE475 DR. Kirkman Lecture 10 USC 3 RX Mixer Output f RF f LO f IF =f RF +/- f LO RF LO IF- IF+ 2320 2300 20 4620 2280 2300 -20 4580 2332.5 2312.5 20 4645 2292.5 2312.5 -20 4605
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EE475 DR. Kirkman Lecture 10 USC 4 QPSK Quadrature Phase Shift Keying Use 2 components separated in phase by 90 degrees 1 1 ) sin( ) cos( ) ( ± = ± = + = Q I Q I i A A t A t A t s ϖ 2 2 ± For normalization I A Q A Binary Data 1 1 1,1 -1 1 0,1 -1 -1 0,0 1 -1 1,0
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EE475 DR. Kirkman Lecture 10 USC 5 Constellation Diagram I Q s 0 s 1 s 2 s 3 Consider errors: If s0 is received as s1 or s3 It is 1 bit error If s0 is received as s2 It is 2 bit error
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EE475 DR. Kirkman Lecture 10 USC 6 Info http://www.educatorscorner.com/index.cgi?CONTENT_ID=2478 Agilent article on modulation QAM article of interest:
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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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Mixers_and_Modulation - Wireless Communications Technology...

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