JOURNAL OF COMMUNICATIONS (JCM)
ISSN : 1796-2021
Volume : 4    Issue : 4    Date : May 2009

A Novel Interference Safety Margin for Cognitive Radio MANET using Smart Antennas
Mathieu Boutin, Charles Despins, Tayeb Denidni, and Sofiène Affes
Page(s): 257-266
Full Text:
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Abstract
A new interference estimation technique is proposed for the deployment of a
smart-antenna-equipped MANET (Mobile Ad hoc NETwork), acting as a secondary network, sharing
the same scarce frequency band as many legacy fixed antennas (primary network) in the same
area. With the help of only a coarse probabilistic estimate of each primary antenna location, the
MANET can voluntarily overestimate the aggregate interference it causes to the primary network. The
latter indeed imposes an aggregate interference safety margin for the former to respect, following a
chosen minimum probability. By means of simulations prior to deployment, the MANET can thus
assess the impact of its future spectrum sharing with the primary network, and take
countermeasures accordingly. The proposed technique offers great potential, for the deployment of
a cognitive MANET, since advances in millimeter radio waves technologies will soon make smart
antennas easily portable in size.

Index Terms
cognitive radio, interference estimation, interference safety margin, mobile ad hoc network,
probabilistic location, smart antennas, uncertainty circle.