Sirius Sat Building Propogation IEEE

Sirius Sat Building Propogation IEEE - 954 IEEE...

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954 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 41, NO. 7, JULY 1993 Propagation Measurements for Satellite Radio Reception Inside Buildings Wolfhard J. Vogel, Senior Member, IEEE, and Geoffrey W. Torrence Abstract-Swept CW signals (from 700 to 1800 MHz) were re- ceived inside six buildings of brick, corrugated sheet-metal, wood- frame, mobile-home, and reinforced concrete-wall construction. A transmitter antenna was mounted outdoors on top of an 18 m tower to simulate a satellite, and a linearly scanned directional receiver antenna was used to probe the spatial, spectral, and temporal variability of the signal indoors. Levels were found to have much structure in the spatial and frequency domain, but were relatively stable in time. Typically, people moving nearby produced variations of less than 0.5 dB, whereas a person blocking the transmission path produced fades of 6 to 10 dB. At an average position in a room, losses increased with frequency from 6 to 12 dB, but could be mitigated to just 2 to 6 dB by moving the antenna typically less than 30 cm. Severe losses (17.5 dB, mitigated to 12.5 dB) were observed in the concrete-wall building, which also exhibited the longest multipath delays (>lo0 ns). Losses inside a mobile home were even larger (>20 dB) and were independent of antenna orientation. The median trough- to-crest distance was near 40 cm; the median trough length decreased from 30 cm at -3 dB to 10 cm at -18 dB and was direction independent. The power-frequency distortion increased with the logarithm of the bandwidth, but could be reduced by moving to a position of higher power. Only the losses showed a clear frequency dependence. I. INTRODUCTION EVERAL efforts [ I]-[3] are under way to develop systems S for direct broadcasting of radio programs, ranging from geostationary satellites (BSS-Sound) to inexpensive personal receivers in houses and cars. System features such as a shareable space segment in a safe location, footprints tailored from global to local coverage using multiple spot beams, and flexible sound quality through digital signal processing combine to make this an attractive technology. In recognition of this potential, the 1452-1492 MHz band was allocated for BSS-Sound use on a global basis at the 1992 World Administrative Radio Conference (WARC 92) [4]. One of the BSS-Sound scenarios envisioned by system designers consists of a portable receiver operated in the interior of a building, but without the benefit of an exterior antenna. In order to provide data on which robust design decisions can be based, this paper presents signal strength measurements made inside of six buildings over the 700-1800 MHz band, using a tower-mounted transmitter in lieu of a satellite. Satellite-earth radio wave building attenuation Manuscript received September 15, 1992; revised February I, 1993.
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This note was uploaded on 01/31/2012 for the course EE 4002 taught by Professor Scalzo during the Fall '06 term at LSU.

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Sirius Sat Building Propogation IEEE - 954 IEEE...

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