| Publisher | University of Texas | ||
|---|---|---|---|
| Format | 191.8KB PDF | Date added | 10 May 2004 |
| Topics | Wireless LAN, Mobile - Wireless Communications | ||
| Downloads | 265 | ||
Orthogonal Frequency Division Multiple Access (OFDMA) basestations allow multiple users to transmit simultaneously on different subcarriers during the same symbol period. This paper considers basestation allocation of subcarriers and power to each user to maximize the sum of user data rates, subject to constraints on total power, bit error rate, and proportionality among user data rates. Previous allocation methods have been iterative nonlinear methods suitable for offline optimization. In the special high subchannel SNR case, an iterative root-finding method has linear-time complexity in the number of users and N logN complexity in the number of subchannels. This paper proposes a non-iterative method that is made possible by the relaxation of strict user rate proportionality constraints.
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