Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Jeffery Wepman; J. Randy Hoffman; Lynette H. Loew; Vincent S. Lawrence

Abstract: Impulse response measurements were taken simultaneously in both the 902-928 and 1850-1990 MHz bands using a wideband measurement system consisting of a fixed transmitter and a mobile receiver. Four different macrocells representing typical semi-rural, suburban, urban, and urban high-rise environments were used for the measurements. Vertically polarized transmit and receive antennas were used for all cell; circularly polarized transmit antennas were also used in the suburban and urban high-rise cells. RMS delay spread, correlation bandwidth, and various other multipath power statistics were used to characterize the wideband propagation and to provide a comparison between the two frequency bands, the two transmit antenna polarizations, and the different cell environments. Major differences were not seen in the propagation behavior between the two frequency bands. The urban high-rise cell exhibited the most multipath, showing more delayed signals having higher power and longer delays than in the other cells. An improvement in propagation (less multipath) was seen when using the circularly polarized transmit antennas instead of the vertically polarized ones for 1920 MHz.

Keywords: PCS; Personal Communication Services; correlation bandwidth; coherence bandwidth; impulse response measurements; power delay profiles; RMS delay spread; wideband measurements

To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572

For technical information concerning this report, contact:

Jeffery A. Wepman
Institute for Telecommunication Sciences
(303) 497-3165

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

Back to Search Results