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Relay Selection and Power Allocation in Cooperative Cellular Networks
 

Summary: 1
Relay Selection and Power Allocation in
Cooperative Cellular Networks
Sachin Kadloor and Raviraj Adve
Department of Electrical and Computer Engineering, University of Toronto
10 King's College Road, Toronto, ON M5S 3G4, Canada
Email: {skadloor, rsadve}@comm.utoronto.ca
Abstract
We consider a system with a single base station communicating with multiple users over orthogonal channels
while being assisted by multiple relays. Several recent works have suggested that, in such a scenario, selection,
i.e., a single relay helping the source, is the best relaying option in terms of the resulting complexity and overhead.
However, in a multiuser setting, optimal relay assignment is a combinatorial problem. In this paper, we formulate
a related convex optimization problem that provides an extremely tight upper bound on performance and show that
selection is, almost always, inherent in the solution. We also provide a heuristic to find a close-to-optimal relay
assignment and power allocation across users supported by a single relay. Simulation results using realistic channel
models demonstrate the efficacy of the proposed schemes, but also raise the question as to whether the gains from
relaying are worth the additional costs.
I. INTRODUCTION
In distributed wireless systems wherein each node possesses only a single antenna, relays can be
used to provide spatial diversity and combat the impact of fading. Relaying has been an extremely

  

Source: Adve, Raviraj - Department of Electrical and Computer Engineering, University of Toronto

 

Collections: Engineering