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A fresh look at optimal subcarrier allocation in OFDMA systems | IEEE Conference Publication | IEEE Xplore

A fresh look at optimal subcarrier allocation in OFDMA systems


Abstract:

This paper considers the issue of optimal subcarrier allocation in OFDMA. We show, via a counter example, that water-filling based subcarrier allocation policies, contrar...Show More

Abstract:

This paper considers the issue of optimal subcarrier allocation in OFDMA. We show, 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. In this paper, we identify an optimal non-idling policy which balances the queue lengths, when the channel follows an ON/OFF model. In such case, we show that such a policy achieves the minimum average holding cost (mean response time) at any time.
Date of Conference: 14-17 December 2004
Date Added to IEEE Xplore: 16 May 2005
Print ISBN:0-7803-8682-5
Print ISSN: 0191-2216
Conference Location: Nassau, Bahamas

References

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