MIT16_36s09_lec12

MIT16_36s09_lec12 - MIT OpenCourseWare http:/ocw.mit.edu...

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MIT OpenCourseWare http://ocw.mit.edu 16.36 Communication Systems Engineering Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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Lecture 12: Link Budget Analysis and Design Eytan Modiano Eytan Modiano Slide 1
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Signal attenuation Tx Rx Channel + n(t) P T P R L The signal suffers an attenuation loss L Received power P R = P T /L Received SNR = E b /N 0 , E b = P R /R b Antennas are used to compensate for attenuation loss Capture as much of the signal as possible G T G R Tx Rx P R = P T G T G R /L P T L = (4 π d/ λ ) 2 L = free space loss, d = distance between Tx and Rx Eytan Modiano Slide 2 λ = signal wavelength
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Antenna Gains G R = A R 4 π / λ 2 A R is the effective area of the antenna For Parabolic antenna A R = πη D 2 /4 η = illumination efficiency factor , 0.5 < η < 0.6 D = dish diameter => G R = η ( π D/ λ ) 2 => PR = P T G T D 2 η /(4d) 2 Eytan Modiano Slide 3
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Antenna Beamwidth θ B Beamwidth is a measure of the directivity of the antenna
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This note was uploaded on 11/07/2011 for the course AERO 16.38 taught by Professor Alexandremegretski during the Spring '09 term at MIT.

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MIT16_36s09_lec12 - MIT OpenCourseWare http:/ocw.mit.edu...

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