Tim Ireland, Adam Nyzio, Michael Zink, Jim Kurose

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The Impact of Directional Antenna Orientation,
Spacing, and Channel Separation on Long-distance
Multi-hop 802.11g Networks A Measurement Study

• Tim Ireland, Adam Nyzio, Michael Zink, Jim Kurose
• Department of Computer Science
• University of Massachusetts Amherst

WiNMee07, April 20th 2007
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Motivation
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Overview

• Motivation
• Measurement Setup
• Antenna Orientation
• Antenna Separation
• Routing vs. Non-routing
• Conclusion and Outlook

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Measurement Setup

• Laptops
• Proxim 802.11 b/g WLAN
• 14.5 dBi Yagi antennas

• TCP-based throughput measurements (Iperf)
• 10 times 30 seconds for each setup

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Antenna Orientation

• 10 Mbps increase depending on antenna orientation
• Almost full channel capacity with fully separated
  channels
• The answer lies in the antenna gain pattern

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Antenna Separation

• 8.2 Mbps increase through 2 meters vertical
  separation
• Throughput increase independent from azimuthal
  orientation

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Routing vs. Non-routing
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Routing vs. Non-routing
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Conclusions Future Work

• Orientation and separation have significant
  impact on throughput
• Influence of data handling at the multi-hop node
• Antenna beam pattern
• Max. throughput for complete channel separation