Dynamic Resource Allocation in OFDMA Uplink for MAI Mitigation and Throughput Improvement
Dynamic Resource Allocation in OFDMA Uplink for MAI Mitigation and Throughput Improvement
复制标题
OFDMA 上行链路中的动态资源分配可缓解 MAI 并提高吞吐量
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
A. Wolisz
中科院分区：
文献类型：
--
作者：
Hieu Le;A. Behboodi;A. Wolisz
在 OFDMA 上行链路中，由用户信号中的同步偏移引起的多址干扰 (MAI) 会显着降低用户吞吐量。在本文中，我们研究了应用动态资源分配 (DRA) 来减轻 MAI 并同时提高用户吞吐量的问题。首先，我们在 DRA 之后引入了一种新颖的可解优化问题（OP），以最大化最小用户吞吐量。使用这个提出的 OP，我们表明，与现有的 DRA 启发式方法相比，最佳资源分配方案可以将最小用户吞吐量提高高达 300%，与基于估计和校正的方法相比，可将最小用户吞吐量提高 25%。其次，通过研究频率分配，我们深入了解了 DRA 在上行链路中的优势，其中更好地利用频率和多用户分集可实现有效的 MAI 缓解和显着的吞吐量增益。最后，我们引入次优OP来降低复杂性，其中基于分块的OP可以显着降低复杂性，并且仍然提供可比较的吞吐量增益。
In OFDMA uplink, Multiple Access Interference (MAI) caused by synchronization offsets in user signals can considerably degrade user throughputs. In this paper, we investigate the problem of applying Dynamic Resource Allocation (DRA) to mitigate MAI and simultaneously improve user throughputs. Firstly, we introduce a novel solvable optimization problem (OP) following DRA to maximize the minimum user throughput. Using this proposed OP, we show the optimal resource allocation schemes can increase minimum user throughput up to 300% compared to existing DRA heuristics, and to 25% compared to the estimation and correction based approach. Secondly, by investigating the frequency assignment, we show an insight about the advantage of DRA in uplink, where better exploitation of frequency and multiuser diversities leads to efficient MAI mitigation and significant throughput gain. Finally, we introduce suboptimal OPs to reduce the complexity, among that the one based on chunking can significantly reduce the complexity and still provide comparable throughput gain.