Proc. IEEE Global
Comm. Conf., Dec. 1-5, 2003, vol. 1, pp. 337-341,
San Francisco, CA USA.
Optimal Power Allocation in Multiuser OFDM Systems
Zukang Shen,
Jeff Andrews, and
Brian L. Evans
Wireless Networking and Communications Group,
Department of Electrical and Computer Engineering,
The University of Texas at Austin,
Austin, TX 78712 USA
shen@ece.utexas.edu -
jandrews@ece.utexas.edu -
bevans@ece.utexas.edu
Paper -
Talk
Abstract
Multiuser orthogonal frequency division multiplexing (MU-OFDM) is a
promising technique for achieving high downlink capacities in future
cellular systems. A key issue in MU-OFDM is the allocation of the OFDM
subcarriers and power among users sharing the channel. Previous
allocation algorithms cannot ensure fairness in advance. In this paper,
a proportional rate adaptive resource allocation method for MU-OFDM
is proposed. Subcarrier and power allocation are carried out sequentially
to reduce the complexity, and an optimal power allocation procedure is
derived, through which proportional fairness is achieved. Simulation
results show that this low-complexity MU-OFDM system achieves double
the capacity of a fixed time division approach to OFDM multiple access,
and also has higher capacity than previously derived suboptimal power
distribution schemes.
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