The Propagation Group

Georgia Tech ECE Research Group

Home of the Georgia Tech Propagation Group

News and Resources for the Durgin Research Group
  • Home
    • News
    • Positions
  • Education
    • Problem of the Day
    • ECE 3025 Electromagnetics
    • ECE 4370 Antenna Engineering
    • ECE 6361 Microwave Design Lab
    • ECE 6390 Satellite Communications
    • ECE 8833 Advanced Analytical Emag
  • Research
    • Backscatter Radio
    • Radiolocation
    • Wireless Power
    • Propagation Measurement and Modeling
  • Publications
    • Google Scholar Page
    • IEEExplore
    • YouTube Channel
    • Research Gate
  • People
    • Prof. Gregory D. Durgin
    • Current Members
    • PhD Alumni
    • Other Alumni
  • Partners
    • Sponsors
    • Opportunity Research Scholars
    • Georgia Tech ECE

Logos Explained

Posted on January 8, 2018 Written by Gregory Durgin

Where did the GT Prop Group’s logo come from and what does it mean?

The logo was formulated in 2003 as part of the newly launched GT Prop Group laboratory.  The three bubbles joined by three bars represent the three main domains that an electrical engineer specializing in propagation must work in: time, space, and frequency.  The three bubbles are filled with three common power spectral densities describing propagation in complicated, stochastic media.  These simple shapes bely some very sophisticated concepts in radio wave propagation and electrical engineering in general.

For time-varying channels, the lower-left bubble has a Gaussian Doppler spectrum.  The Doppler (frequency) domain is the spectral compliment of the time domain.  The Gaussian spectrum is useful for characterizing typical time-variations because of its symmetrical shape that tapers dramatically away from its center.  Faster-moving scatterers displace frequency more dramatically in the Doppler domain, but are less common or large.  In other words, the bigger something is, the more it scatters but the less likely it is to move.

For frequency-varying channels, the upper bubble has an exponential delay spectrum.  The delay domain is the spectral compliment of the frequency domain.  The exponential spectrum is useful for characterizing typical delay-variations because of its causal, decaying shape that mimics the profiled of radio echoes in a dispersive channel.

For space-varying channels, the lower-right bubble has a U-shaped wavenumber spectrum.  The wavenumber domain is the spectral compliment of the space domain.  This U-shaped spectrum is useful for characterizing typical multipath directions in space for heavy-scattering regions.  This shape was first formulated by R.H. Clarke from Bell labs to model small-scale fading channels in mobile radio.

Filed Under: Propagation Modeling

Conference Watch

IEEE RFID 2018
10-12 April 2018, Orlando, FL

IEEE ICC 2018
20-24 May 2018, Kansas City, MO

IEEE WPTC 2018 
3-7 June 2018, Montreal CA

IEEE IMS 2018
10-15 June 2018, Philadelphia, PA

IEEE SPAWC 2018
25-28 June 2018, Kalamata, Greece

IEEE APS 2018
8-13 July 2018, Boston, MA

IEEE RFID-TA 2018
26-28 September 2018, Macau

IEEE GLOBECOM 2018
9-13 December 2018, Abu Dhabi UAE
Submission: 15 April 2018

IEEE WiSEE 2018
11-13 December 2018, Huntsville, AL
Submission:  1 July 2018

Archives

  • April 2018
  • March 2018
  • February 2018
  • January 2018
  • December 2017
  • November 2017
  • October 2017

Copyright © 2018 · Focus Pro Theme on Genesis Framework · WordPress · Log in