September 1993 | NTIA Technical Report TR-93-299
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; correlation bandwidth; coherence bandwidth; impulse response measurements; power delay profiles; RMS delay spread; wideband measurements; personal communications services (PCS)
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Jeffery A. Wepman
Institute for Telecommunication Sciences
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