DocumentCode :
1416297
Title :
Decentralized Relay Selection Schemes in Uniformly Distributed Wireless Sensor Networks
Author :
Etezadi, Farrokh ; Zarifi, Keyvan ; Ghrayeb, Ali ; Affes, Sofiène
Author_Institution :
Univ. of Toronto, Toronto, ON, Canada
Volume :
11
Issue :
3
fYear :
2012
fDate :
3/1/2012 12:00:00 AM
Firstpage :
938
Lastpage :
951
Abstract :
We study three relay selection schemes for uniformly distributed wireless sensor networks: 1) optimal selection where the relays that maximize the signal-to-noise ratio (SNR) at the destination are selected, 2) geometry-based, which is based on selecting the closest nodes to the source, and 3) random selection in which the nodes are selected randomly from a certain neighborhood of the source. In all schemes, we assume that all relays operate in the amplify-and-forward mode and transmit with equal average powers and each relay has only access to its backward channel and location. For each relay selection strategy, we propose a decentralized protocol whereby proper nodes choose to act as relays without requiring any central coordinating entity or any inter-node information transfer. We derive expressions for the average SNR at the relays and destination while assuming that the source-node distances and the inter-terminal channel links are completely random. We show that, for all proposed schemes, the SNR variance at the destination converges to zero as the number of relays increases. While each selection scheme has its pros and cons, we derive a sufficient condition under which the average SNR at the destination becomes independent of the selection scheme employed.
Keywords :
amplify and forward communication; protocols; radio links; random processes; wireless channels; wireless sensor networks; SNR variance; amplify and forward mode; backward channel; decentralized protocol; decentralized relay selection scheme; geometry-based scheme; interterminal channel links; optimal relay selection; random selection; signal-to-noise ratio; source-node distances; uniformly distributed wireless sensor networks; Fading; Network topology; Radiation detectors; Relays; Signal to noise ratio; Switches; Wireless sensor networks; Amplify-and-forward; cooperative communications; relay selection; wireless sensor networks;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2012.010312.101314
Filename :
6123785
Link To Document :
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