On the Effectiveness of Switched Beam Antennas in Indoor Environments
by Marc Blanco, Ravi Kokku, Kishore Ramachandran, Sampath Rangarajan, Karthik Sundaresan
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| url: | http://www.nec-labs.com/~ravik/RESEARCH/directional.pdf | | abstract: | Switched beam antennas are an attractive extension to indoor wireless LANs due to their increased signal gain in a chosen direction; the gain can be exploited for improving the wireless link quality, increasing spatial reuse and node localization.
However, indoor environments are susceptible to multipath re
ections that may
reduce the degree of directionality of the antennas. To this end, in this paper,
we address the following questions that have not been explored well in the open
literature: how directional in reality is a beam with a switched beam antenna in a
re
ection-rich environment, and what are the implications of the observed directionality
on spatial reuse and node localization? And how does the directionality
get affected with the characteristics of a beam such as main and side lobe width,
and front to side lobe ratio? We present results of measurements in a real office setting with a switched beam antenna built out of an 8-element phase array. |
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