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Energy Efficiency of a Two-Stage Relaying Scheme in Wireless Sensor Networks
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This paper deals with a wireless relay system consisting of one source node, a number of relay nodes and one destination node. The relay nodes amplify and then encode their received signals using a distributed space-time code. Under a non-restrictive asymptotic assumption, we prove some upper bounds on the pairwise error probability for different transmission scenarios. These bounds suggest that significant diversity gains can be achieved in such cooperative systems. Moreover, they can be used to optimize the allocation of transmit powers to the nodes. In wireless sensor networks, however, the power consumption associated with signal processing cannot be neglected. Therefore, we introduce a simple but realistic hardware model to evaluate by means of simulations the overall energy-efficiency of the analyzed space-time coded cooperative relaying scheme. The numerical results show that, for a large range of path losses between the source and destination, direct (non-cooperative) transmission provides the best performance in terms of the overall energy consumption.
@inproceedings{HSS08eeoa,
author = "Ruben Heras-Evangelio and Slawomir Stanczak and Clemens Schnurr",
title = "{Energy Efficiency of a Two-Stage Relaying Scheme in Wireless Sensor Networks}",
booktitle = "{Proc. 42nd Annual Conference on Information Sciences and Systems (CISS 2008)}",
address = "Princeton University, USA",
month = "Mar.",
year = "2008",
}
Last modified 09.04.2008 16:42
Fokusseminar 02.11.2012
