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
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
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
COPYRIGHT NOTICE: All the documents on this server
have been submitted by their authors to scholarly journals or conferences
as indicated, for the purpose of non-commercial dissemination of
The manuscripts are put on-line to facilitate this purpose.
These manuscripts are copyrighted by the authors or the journals in which
they were published.
You may copy a manuscript for scholarly, non-commercial purposes, such
as research or instruction, provided that you agree to respect these
Last Updated 01/27/04.