Exploiting Decentralized Channel State Information for Slotted ALOHA
Date Issued
2011
Date
2011
Author(s)
Liu, Chi-Tang
Abstract
Conventional Slotted ALOHA is a random access protocol designed for collision channels. In this thesis, we consider a cross layer design that exploits decentralized channel state information (D-CSI) for the Medium Access Control (MAC) layer protocol such as slotted ALOHA under the SINR capture model. In view of the inferior performance of the threshold based transmission, we first propose a single-region based channel aware ALOHA strategy that can reduce the multiple access interference (MAI). The system throughput is analyzed and optimized for a wireless network with homogeneous fading. We then propose a two-region extension. Both strategies have a significant gain over other common used protocols.
We conclude that the Single-Region strategy is preferable when the SINR capture ratio is smaller than one and the Two-Region strategy is better when the SINR capture ratio is large than one.
Subjects
random access ALOHA
Multipacket reception
channel awareness
Type
thesis
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