Over  the  past  decade,  spectrum  sharing  has  evolved  from  numerous  research  projects  into viable commercial systems poised to meet the ever-increasing spectrum demand from service providers and end users. In the United States, the first deployments of spectrum sharing systems fall into the broad category of  Administratively  Managed  --  where  access  to  the  spectrum,  as  well  as  interference resolution, is overseen by one  or  more band  managers. The key to the success of these systems is accurate and reliable propagation models that will simultaneously maximize the number of users able to access the spectrum and minimize the interference to incumbent or protected users.  The classical propagation models currently utilized by these systems -- the Irregular Terrain Model (ITM) and Extended Hata (eHata) -- do not account for features such as foliage or endpoint clutter that can have a large impact on propagation loss. This  talk  presents  a  measurements-based  framework  for  updating  these  classical  models  as  well  as proposing a new integrated terrain and clutter model using publicly-available geographic information system datasets.  Over 400,000 path loss measurements were recorded in nine diverse locations across the United States at 1.7 and 3.5 GHz.  Our updates improved the RMS difference between measurements and model by  3-7  dB  for  ITM  and  3-14  dB  for eHata. Additionally, we demonstrate several integrated terrain and clutter models that have RMS differences ranging from 9.5 -- 17.8 dB, with improvements of up to 4.7 dB over ITM and 6.7 dB over eHata.  Finally, cross-validation was used to demonstrate the generalizability our models to a wide variety of propagation environments.

 

Bio

Host

Prof. Leah Jamieson, lhj@purdue.edu, 765-494-3653