Wireless LAN White Papers
Adaptive Resource Allocation in Multiuser OFDM Systems With Proportional Fairness
Overview 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.
| Publisher | The University of Texas at Austin | File Format | PDF, requires Acrobat Rdr 5 |
|---|---|---|---|
| Date Published | June 2004 | Downloads | 147 |
| Format | White Papers | ||
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