{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

CE-451 Spring 10-lec9 - MOBILE COMMUNICATIONS 1 Lecture9...

Info icon This preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
CE-451 SPRING 2010 MOBILE  COMMUNICATIONS Lecture 9 Mobile Radio Propagation:  Large-Scale Path Loss  I n s t i t u t e o f S p a c e T e c h n o l o g y 1
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
FRESNEL SCREENS 2 I n s t i t u t e o f S p a c e T e c h n o l o g y
Image of page 2
The  excess path length  ( Δ) is the difference between the direct path and the diffracted path, given by for fig 4.10b: The corresponding phase difference is: Fresnel – Kirchoff  diffraction parameter  v  is given by: 3 I n s t i t u t e o f S p a c e T e c h n o l o g y ( 29 2 1 2 1 2 2 d d d d h + = ( 29 2 1 2 1 2 2 2 2 d d d d h + = = λ π λ π φ ( 29 ( 29 2 1 2 1 2 1 2 1 2 2 d d d d d d d d h v + = + = λ α λ
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
FRESNEL DIFFRACTION GEOMETRY 4 I n s t i t u t e o f S p a c e T e c h n o l o g y Figure 4.12 Illustration of Fresnel zones for different knife-edge diffraction scenarios.
Image of page 4
KNIFE-EDGE DIFFRACTION MODEL Treat single obstruction as a diffracting  knife-edge. Consider  a  receiver  in  the  shadowed  region (called diffraction zone), R Field  strength  at  this  point  is  a  vector  sum of fields due to all of the secondary  Huygen’s sources 5 I n s t i t u t e o f S p a c e T e c h n o l o g y
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
6 I n s t i t u t e o f S p a c e T e c h n o l o g y
Image of page 6
KNIFE-EDGE DIFFRACTION LOSS 7 I n s t i t u t e o f S p a c e T e c h n o l o g y
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
MULTIPLE KNIFE-EDGE  DIFFRACTION 8 I n s t i t u t e o f S p a c e T e c h n o l o g y
Image of page 8
SCATTERING I n s t i t u t e o f S p a c e T e c h n o l o g y 9
Image of page 9

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
When  radio  wave  impinges  on  a  rough  surface,  the  reflected  energy  is  spread  out  (diffused)  in  all  directions  due  to  scattering Surface  is  smooth  if  its  min  to  max  protuberance  h  is less than  h c , Surface  is  considered  rough  if  protuberance is greater than  h c Where  h (critical  height  of  surface  protuberance  for  a  given  incident  angle  θ i ) is given by: 10 I n s t i t u t e o f S p a c e T e c h n o l o g y i c h θ λ sin 8 =
Image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern