Wireless LAN White Papers
A Fresh Look at Optimal Subcarrier Allocation in OFDMA Systems
Overview This paper considers the issue of optimal subcarrier allocation in OFDMA. This paper shows, via a counter example, that water-filling based subcarrier allocation policies, contrary to conventional wisdom, fail to provide rate-stability for an otherwise stabilizable OFDMA system. Water-filling is too myopic when considering long-time average performance, e.g. delay, queue lengths, and even long-run throughput. This is because such policies ignore variable state (queue length) information, while, in fact, such an information is necessary to guarantee rate stability and/or to minimize average delay. This paper identifies an optimal non-idling policy which balances the queue lengths, when the channel follows an ON/OFF model.
| Publisher | University of Washington | File Format | |
|---|---|---|---|
| Date Published | September 2004 | ||
| Format | White Papers | ||
| Topics | |||
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