Analysis of Ultra-wide Band Signal Propagation in Urban Environments

G. Schiavone, P. Wahid, and R. Palaniappan (USA)

Keywords

ultrawide band, FDTD, ray tracing,simulation.

Abstract

The ultra-wide band signal propagation in urban environment is measured and studied in this paper. A The basic concept is to develop, transmit and receive an extremely short duration burst of radio frequency energy typically a few tens of Pico seconds to a few nanoseconds in duration. The resultant waveforms are extremely broadband, so much so that it is often difficult to determine an actual RF center frequencythus the term “carrier free”[1]. In this paper we study the indoor propagation of UWB signal inside of an office room. We compare a simulation model of this system with the actual test results. . The modeling is computationally intensive and will require large memory capacity. To overcome this, the modeling application is designed to optionally run on general cluster computing. IST is equipped with a number of platforms to facilitate development and testing of this application. In 1999, IST built a CLASS I Beowulf cluster, consisting of 17 nodes and 34 Pentium II processors, with 256 Mb of RAM and 8.6 Gb of local storage per node. Cluster communications take place over a three channel-bonded fast Ethernet network, using low-latency switches to minimize network traffic. Recently, funding has been obtained to construct two large clusters that will place UCF as one of the premier cluster computing research centers in the world. Currently, we are completing a 128 node cluster consisting of 128 900 Mhz Athlon processor, with 32 Gb total RAM and 1.6 Terabytes total secondary storage. Funding also has been obtained to extend this cluster to 256 processors, and to build an additional 192-node cluster. These advanced clusters will be among the top 500 most powerful computers in the world.

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