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
- Apr 10, 2008
- Format
- White Papers
- Topics
- Wireless LAN, Modems
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