Cooperative Diversity Routing in Wireless Networks
Date
2009-10-07T16:01:56Z
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
In this paper, we explore physical layer cooperative communication in order to design network
layer routing algorithms that are energy efficient. We assume each node in the network is equipped with
a single omnidirectional antenna and that multiple nodes are able to coordinate their transmissions in
order to take advantage of spatial diversity to save energy. Specifically, we consider cooperative diversity
at physical layer and multi-hop routing at network layer, and formulate minimum energy routing as a
joint optimization of the transmission power at the physical layer and the link selection at the network
layer. We then show that as the network becomes larger, finding optimal cooperative routes becomes
computationally intractable. As such, we develop a number of heuristic routing algorithms that have
polynomial computational complexity, and yet achieve significant energy savings. Simulation results
are also presented, which indicate that the proposed algorithms based on optimal power allocation
significantly outperform existing algorithms based on equal power allocation, by more than 60% in
some simulated scenarios.
Description
Keywords
wireless networks