CSE5345_Lecture4

# CSE5345_Lecture4 - SunSPOT Programming www.sunspotworld.com...

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1 CSE 5345 – Fundamentals of Wireless Networks Yonghe Liu [email protected] 1/26/12 SunSPOT Programming www.sunspotworld.com Group based project 2-3 students per group You will be lent a device kit We have more than 10kits==30nodes • Use all or use a few SunSPOT Programming Resources: general sensor network material http://www.sunspotworld.com/ Last Class Antenna Propagation

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2 Radiation Patterns Radiation pattern Graphical representation of radiation properties of an antenna Depicted as two-dimensional cross section Reception pattern Receiving antenna’s equivalent to radiation pattern Antenna Gain Antenna gain Power output, in a particular direction, compared to that produced in any direction by a perfect omnidirectional antenna (isotropic antenna) Effective area Related to physical size and shape of antenna Antenna Gain Relationship between antenna gain and effective area G = antenna gain A e = effective area f = carrier frequency • c = speed of light  3 10 8 m/s) = carrier wavelength 2 2 2 4 4 c A f A G e e Propagation Modes Ground-wave propagation Sky-wave propagation Line-of-sight propagation
3 Free Space Loss Free space loss, ideal isotropic antenna P t = signal power at transmitting antenna P r = signal power at receiving antenna = carrier wavelength d = propagation distance between antennas c = speed of light  3 10 8 m/s) where d and are in the same units (e.g., meters)  2 2 2 2 4 4 c fd d P P r t Free Space Loss Free space loss accounting for gain of other antennas G t

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## This note was uploaded on 03/22/2012 for the course CSE 5345 taught by Professor Youngheliu during the Spring '12 term at UT Arlington.

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CSE5345_Lecture4 - SunSPOT Programming www.sunspotworld.com...

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