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Measurement-based assessment of space diversity for indoor fixed wireless channels

University of British Columbia

We have employed a measurement-based approach to investigate the effectiveness of space diversity in indoor fixed wireless environments where body shadowing (blockage of the line-of-sight between the transmitter and receiver by the movement of people) is a significant impairment. In order to assist those planning measurement campaigns in indoor fixed wireless environments, we present simulation results that give the sample duration required to accurately estimate path gain and Rician K-factor given the parameters of the Doppler spectrum (type and cut-off) and the sample rate. Next, we present measurement results that show the received signal envelope generally follows the Rician distribution when people move between the transmitter and receiver. We also reveal details of the manner in which body shadowing affects the shape of the Doppler spectrum observed in indoor fixed environments. In particular, we show that body movement can give rise to small sidebands in the Doppler spectrum. Finally, we compare theoretical predictions of spatial correlation as a function of antenna spacing to the measurement results and found reasonable agreement. The results give us confidence that our measurement system is suitable for use in more ambitious measurement campaigns in the future. Finally, we show how measurement-based models could be used in dynamic simulations of space diversity channels in indoor fixed wireless environments.

Text

2009-12-11

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http://hdl.handle.net/2429/16437

Electrical and Computer Engineering

University of British Columbia

UBCV

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