Subcarrier allocation in OFDMA systems: beyond water-filling

Subcarrier allocation in OFDMA systems: beyond water-filling
复制标题

OFDMA 系统中的子载波分配:超越注水

DOI:
--
复制
发表时间:
2004
期刊:
Conference Record of the Thirty-Eighth Asilomar Conference on Signals, Systems and Computers, 2004.
影响因子:
--
通讯作者:
T. Javidi
T. Javidi
中科院分区:
--
文献类型:
--
作者:
S. Kittipiyakul;T. Javidi

文献摘要

被引文献

相似文献

本文研究了OFDMA中的子载波优化分配问题。当包括随时间变化的数据包到达和信道,我们表明,通过一个反例,注水为基础的子载波分配政策,与传统的智慧,未能提供速率稳定性,否则稳定的OFDMA系统。我们简要地讨论了OFDM中的长期吞吐量最优性,如(S。Kittipiyakul等人,2004年)。特别是在一个简单的通道模型下,我们考虑一个nonidling政策,平衡队列和优于注水政策,实现最小的平均延迟。在本文中,我们提供了简单的计算算法来实现这样的政策,并提供模拟数值比较研究。
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.