Summary: Optimal Relay Assignment and Power Allocation in
Selection Based Cooperative Cellular Networks
Sachin Kadloor and Raviraj Adve
Department of Electrical and Computer Engineering, University of Toronto
Email: email@example.com, firstname.lastname@example.org
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 selection, i.e., a single relay helping the source, is
the best option in terms of the resulting complexity and overhead.
However, in a multiuser setting, optimal relay assignment is a
combinatorial problem. In this paper, using the sum rate as
our design metric, we develop a convex optimization problem
that provides an extremely tight upper bound on performance.
We also provide a heuristic to find a close-to-optimal relay
assignment. Simulation results using realistic channel models
demonstrate the efficacy of the proposed scheme.
Traditionally, spatial diversity in a wireless communica-
tion system is harnessed by having multiple antennas at the