Energy balancing cooperative diversity for wireless sensor networks

Authors:
Barnabas Hegyi;Janos Levendovszky
Affiliations:
Faculty of Information Technology, Peter Pazmany Catholic University, 1083 Budapest Prater u. 50/a., Hungary.;Faculty of Information Technology, Peter Pazmany Catholic University, 1083 Budapest Prater u. 50/a., Hungary/ Department of Telecommunications, Budapest University of Technology and Economics, 111 ...
Venue:
International Journal of Communication Networks and Distributed Systems
Year:
2008

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Abstract

The paper is concerned with developing energy balancingcooperative diversity schemes for wireless sensor networks in aRayleigh fading environment. In the network scenario we consider,the network is composed of a bottleneck node (BN) - for whichenergy consumption is of crucial importance - and a number of otherless energy constrained nodes. Energy balance is maintained betweenthe BN, i.e. the source and the rest of the network - the relaysand the destination. The latter nodes are elected dynamically in adistributed fashion. In the paper, the optimal decision rules forthe destination node as well as the corresponding bit errorprobability formulas are derived. Besides the theoretical analysis,the gain achieved by cooperative decision has also been evaluatedby extensive simulations, which demonstrated that the lifetime ofthe BN can considerably be increased by the proposedenergy-balancing, cooperative diversity scheme.