Optimal Power Allocation in Multiuser OFDM Systems
- 8 July 2004
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 1, 337-341
- https://doi.org/10.1109/glocom.2003.1258257
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.Keywords
This publication has 7 references indexed in Scilit:
- Transmit power adaptation for multiuser OFDM systemsIEEE Journal on Selected Areas in Communications, 2003
- Multiuser OFDMPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Capacity and optimal power allocation for fading broadcast channels with minimum ratesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- A fourth-generation MIMO-OFDM broadband wireless system: design, performance, and field trial resultsIEEE Communications Magazine, 2002
- Wireless communications: past events and a future perspectiveIEEE Communications Magazine, 2002
- Elements of Information TheoryPublished by Wiley ,2001
- Multicarrier modulation for data transmission: an idea whose time has comeIEEE Communications Magazine, 1990