| Publisher | The University of Texas at Austin | ||
|---|---|---|---|
| Format | 216.8KB PDF, requires Acrobat Rdr 5 | Date added | 13 Jun 2004 |
| Topics | Wireless LAN, Modems | ||
| Downloads | 67 | ||
Multiuser orthogonal frequency division multiplexing (MU-OFDM) is a promising technique for achieving high downlink capacities in future cellular and wireless LAN systems. The sum capacity of MU-OFDM is maximized when each subchannel is assigned to the user with the best channel-to-noise ratio for that subchannel, with power subsequently distributed by water-filling. However, fairness among the users cannot generally be achieved with such a scheme. In this paper, we impose a set of proportional fairness constraints to assure that each user can achieve a required data rate, as in a system with quality of service guarantees. Since the optimal solution to the constrained fairness problem is extremely computationally complex to obtain, this paper proposes a low-complexity suboptimal algorithm that separates subchannel allocation and power allocation.
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