Papandriopoulos, John and Evans, Jamie S. and Dey, Subhrakanti
(2005)
Optimal Power Control for Rayleigh-Faded
Multiuser Systems With Outage Constraints.
IEEE Transactions on Wireless Communications, 4 (6).
pp. 2705-2715.
ISSN 1536-1276
Abstract
How can we achieve the conflicting goals of reduced
transmission power and increased capacity in a wireless network,
without attempting to follow the instantaneous state of a fading channel? In this paper, we address this problem by jointly
considering power control and multiuser detection (MUD) with
outage-probability constraints in a Rayleigh fast-fading environment. The resulting power-control algorithms (PCAs) utilize the
statistics of the channel and operate on a much slower timescale
than traditional schemes. We propose an optimal iterative solution
that is conceptually simple and finds the minimum sum power of
all users while meeting their outage targets. Using a derived bound
on outage probability, we introduce a mapping from outage to
average signal-to-interference ratio (SIR) constraints. This allows
us to propose a suboptimal iterative scheme that is a variation
of an existing solution to a joint power control and MUD problem involving SIR constraints. We further use a recent result
that transforms complex SIR expressions into a compact and
decoupled form, to develop a noniterative and computationally
inexpensive PCA for large systems of users. Simulation results
are presented showing the closeness of the optimal and mapped
schemes, speed of convergence, and performance comparisons.
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