Subcarrier allocation in OFDMA systems: beyond water-filling
Subcarrier allocation in OFDMA systems: beyond water-filling
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OFDMA 系统中的子载波分配:超越注水
DOI:
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发表时间:
2004
期刊:
影响因子:
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通讯作者:
T. Javidi
中科院分区:
文献类型:
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作者:
S. Kittipiyakul;T. Javidi
This paper considers the issue of optimal subcarrier allocation in OFDMA. When including time-varying packet arrivals and channels, 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. We briefly discuss the long-run throughput optimality in OFDM as demonstrated in (S. Kittipiyakul et al., 2004). In particular under a simple channel model, we consider a nonidling policy which balances the queues and outperforms water-filling policies by achieving the minimum average delay. In this paper, we provide simple computation algorithms for implementing such policies and provide simulations for a numerical comparative study.