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Space and frequency diversity measurements of the 1.7 GHz indoor radio channel for wireless personal communications

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3 Author(s)
Todd, S.R. ; Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, Ont., Canada ; El-Tanany, M.S. ; Mahmoud, S.A.

The authors empirically evaluate three diversity schemes for indoor wireless personal communications. Measurements at 1.75 GHz, using a four-branch diversity receiver and selection combining (SC), are analyzed to determine the effects of physical parameters, signal fading statistics and a switched combiner on diversity performance. Results are obtained from numerous locations and over 800 measurements. These indicate that antenna separations of as small as a quarter wavelength provide significant diversity gains. For similar performance, frequency diversity requires separations of at least 5 MHz. A 4-branch combination of these schemes (hybrid diversity) yields on average a 16 dB improvement at 99% signal availability. The local mean variations between branches in these measurements is ±3 dB but this has a negligible effect on average diversity performance using ideal SC. The diversity gains are shown to have a variability of ±2.5 dB. Switch and stay combining (SAS), a form of SC, is sensitive to the input fading statistics and to switch delay. These variations in diversity performance should be considered for a worst case link design

Published in:

Universal Personal Communications, 1992. ICUPC '92 Proceedings., 1st International Conference on

Date of Conference:

29 Sep-1 Oct 1992