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arXiv 0810.2529cs.ITmath.IT
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分布式无线网络中的吞吐量最大化问题研究

On the Throughput Maximization in Dencentralized Wireless Networks

Jamshid Abouei, Alireza Bayesteh, Masoud Ebrahimi, Amir K. Khandani

摘要:

一个分布式的单跳无线网络与$K$链路被认为是,其中的链路被划分成一个固定数量($M$)的集群,每个操作在一个子信道的带宽$\frac{W}{M}$。假设子信道彼此正交。一般的阴影衰落模型,描述参数$(α,\varpi)$,被认为是$α$表示的阴影和$\varpi$($\varpi \leq 1$)的概率表示的平均交联增益。本文的主要目标是在$K \to \infty$的渐近状态下找到最大网络吞吐量,这通过以下方式实现:i)提出分布式和非迭代功率分配策略,其中每个用户的目标是最大化其最佳估计(基于其本地信息,即,直接信道增益),以及ii)选择$M$的最佳值。在本文的第一部分中,网络吞吐量被定义为网络的\textit{average sum-rate},其被示出为$Θ(\log K)$。此外,证明了在强干扰情况下,每个用户的最佳功率分配策略是基于阈值的开关方案。在第二部分中,网络吞吐量被定义为\textit{guaranteed sum-rate},当中断概率接近零时。在这种情况下,它表明,开关功率分配方案最大化的吞吐量,其规模为$\frac{W}{α\varpi} \log K$。此外,在M=1时实现了用于最大化平均和速率和保证的和速率的最佳频谱共享。

英文摘要:

A distributed single-hop wireless network with $K$ links is considered, where the links are partitioned into a fixed number ($M$) of clusters each operating in a subchannel with bandwidth $\frac{W}{M}$. The subchannels are assumed to be orthogonal to each other. A general shadow-fading model, described by parameters $(α,\varpi)$, is considered where $α$ denotes the probability of shadowing and $\varpi$ ($\varpi \leq 1$) represents the average cross-link gains. The main goal of this paper is to find the maximum network throughput in the asymptotic regime of $K \to \infty$, which is achieved by: i) proposing a distributed and non-iterative power allocation strategy, where the objective of each user is to maximize its best estimate (based on its local information, i.e., direct channel gain) of the average network throughput, and ii) choosing the optimum value for $M$. In the first part of the paper, the network hroughput is defined as the \textit{average sum-rate} of the network, which is shown to scale as $Θ(\log K)$. Moreover, it is proved that in the strong interference scenario, the optimum power allocation strategy for each user is a threshold-based on-off scheme. In the second part, the network throughput is defined as the \textit{guaranteed sum-rate}, when the outage probability approaches zero. In this scenario, it is demonstrated that the on-off power allocation scheme maximizes the throughput, which scales as $\frac{W}{α\varpi} \log K$. Moreover, the optimum spectrum sharing for maximizing the average sum-rate and the guaranteed sum-rate is achieved at M=1.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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