ISSN : 1796-2021
Volume : 1    Issue : 1    Date : April 2006

Collaborative Allocation of Orthogonal Frequency Division Multiplex Sub-Carriers using the
Swarm Intelligence
J.C. Dunat, D. Grandblaise and C. Bonnet
Page(s): 68-76
Full Text:
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Future generations of wireless systems require opportunistic spectrum access techniques to
effectively detect and access temporarily unused spectrum bands. Cognitive radios, with their ability
to learn and adapt to their environment, promise to possess such powerful capabilities. As a
consequence, the spectrum allocation of a wireless system could quickly and appropriately
auto-adapt to react to a sudden traffic variation.
In this article, we propose an innovative and efficient distributed spectrum allocation algorithm,
whose objective is to maximize the system UL capacity by exploiting multiuser diversity. The
algorithm is capable of learning over time and of adapting the spectrum allocation when changes
occur in the radio environment. Such an algorithm finds its application in the scope of future WLAN
systems (e.g. 802.11x).

Index Terms
swarm intelligence, distributed optimization, OFDMA, multi-user diversity, multi-channel
opportunistic scheduling, cognitive radio