Publication: Behind-the-scenes of IEEE 802.11a based multi-radio mesh networks: a measurement driven evaluation of inter-channel interference
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2010
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Tutors
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Iaria
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Abstract
To successfully develop IEEE 802.11a based wireless
mesh network solutions that can achieve the reliability and
capacities required to offer high quality triple play services
the use of multiple radios in each mesh node is essential.
Unfortunately, the co-location of multiple antennas in a single
device leads to a number of interference problems. In this paper
the impact of non-overlapping channel interference in IEEE
802.11a based multi-radio nodes is investigated. A detailed
explanation of the performance decreases and their relation
to radio settings is presented. The primary contribution of
this paper is the discovery of a channel interference effect
which is present over the entire 802.11a frequency space.
This interference appears if two radios are located less than
50 cm from each other and both are attempting to operate
as usual. The results were obtained by conducting experiments
in a well planned testbed to produce reliable and
reproducible results. The presented results incorporate multiple
parameters including transmission power, modulation coding
scheme, channel separation and physical layer effects such as
adjacent channel interference, carrier sensing, retransmissions
and packet distortion.
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Keywords
Wireless LAN, Measurement, 802.11a, Multi-radio wireless mesh network
Bibliographic citation
International Journal on Advances in Internet technology (2010), 3(1-2), 65-73