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Interference from the Robledo DSN transmitters to central Madrid IMT-2000/UMTS Ssystem through terrain diffraction at s-Band

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dc.contributor.author Ho, Christian M.
dc.contributor.author Sue, Miles K.
dc.contributor.author Peng, Ted K.
dc.contributor.author Smith, Ernest K.
dc.date.accessioned 2007-09-07T22:14:49Z
dc.date.available 2007-09-07T22:14:49Z
dc.date.issued 2002-01-09
dc.identifier.citation National Radio Science Meeting, Boulder, Colorado, January 9-12 2002 en
dc.identifier.uri http://hdl.handle.net/2014/40395
dc.description.abstract This study evaluates the possible interference from DSN Robledo 70-m transmitter with Madrid IMT-2000/UMTS wireless users in Spain as both systems will share the same frequency band. Using the effective earth radius, the 50 km terrain profile between Robledo and Madrid is modified and reconstructed. The diffraction propagation losses due to mountain peaks are calculated for the receivers in Madrid urban area. The mountains along the path are simplified into a rounded knife-edge and a rounded obstacle. The results show that for a near surface receiver (1.5 m above the ground) in Madrid, interference signal powers received are less than -135 dBm, which is far below the -109 dBm, the IMT-2000 wireless phone threshold. When a receiver is located at about 40 m above the ground (e.g., the top of Clock Tower of Cibeles Palace), diffraction will generate interference power less than -1 15 dBm. We find that our calculation results are basically consistent with those from the Longley-Rice model, while the latter has smaller loss because of the low resolution terrain profile used. As a comparison, we also find that the measurements of interference powers of -121.2 dBm at the top of Clock tower is in the range of the estimation. We conclude that the interference through the diffraction mechanism will not cause any problem to Ih4T-2000/UMTS users at near the surface of Madrid urban area. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 2225604 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2002 en
dc.subject interference en
dc.subject diffraction en
dc.subject propagation en
dc.subject telecommunications
dc.subject S-band
dc.title Interference from the Robledo DSN transmitters to central Madrid IMT-2000/UMTS Ssystem through terrain diffraction at s-Band en
dc.type Preprint en


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