Power evaluation and performance enhancement of CSMA/CA based WLANs.
Masters thesis, National University of Ireland Maynooth.
Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) based Wireless
Local Area Networks (WLANs) are becoming pervasive. As the most commonly employed
standard in WLANs, IEEE 802.11 not only gives rise to health and safety
concern from the general public, but also has the potential for enhanced performance.
Our contributions in this thesis are twofold: (1) We extend a recently introduced
model of transmitted power in WLANs to cover unsaturated conditions when stations
do not always have packets to send. we implement an experimental verification
of the original analytic model and the extended one. We confirm the estimated maximum
power is substantially lower than the International Commission on Non-Ionizing
Radiation Protection (ICNIRP) limit; (2) We propose two decentralized Multiple Access
Control (MAC) schemes that converge to collision-free schedules almost surely
and therefore improve throughput performance. In adopting decentralized learning
techniques, the convergence times of both schemes are brief. Decentralized schedule
length adaption is introduced to provide long-run fair access to the medium and
scalability of the MAC schemes to networks of any size.
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