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arXiv 1402.7247cs.ITmath.IT
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泊松分布Ad Hoc网络的最优离散功率控制

Optimal Discrete Power Control in Poisson-Clustered Ad Hoc Networks

Chun-Hung Liu, Beiyu Rong, Shuguang Cui

摘要:

数字手机中的功率控制实际上是以离散方式实现的,并且通常这种离散功率控制(DPC)方案是次优的。在本文中,我们首先表明,在泊松分布的ad hoc网络中,如果DPC是适当的设计,满足一定的条件下,它可以严格优于恒定功率控制(即没有功率控制)的平均信号干扰比,中断概率和空间重用。这促使我们提出了一个$N$层DPC计划在无线分簇自组织网络中,在圆形集群中的发射机和他们的预期接收机的特点是由一个泊松集群过程(PCP)的平面$\mathbb{R}^2$。每个发射机的集群被镶嵌到$N$层环中,如果预期接收机位于第$i$层,则采用发射功率$P_i$。在$N$层DPC的基础上,重新定义了传输容量和无中断空间复用因子两个性能指标。每个层在一个集群的中断概率的特点,并用于推导出最佳的功率缩放定律$P_i=Θ\left(η_i^{-\fracα{2}}\right)$,与$η_i$选择功率$P_i$和$α$的路径损耗指数的概率。此外,还讨论了基于$η_i$优化$P_i$和$N$的具体设计方法。仿真结果表明,所提出的最佳$N$层DPC显着优于其他现有的功率控制方案的TC和空间重用。

英文摘要:

Power control in a digital handset is practically implemented in a discrete fashion and usually such a discrete power control (DPC) scheme is suboptimal. In this paper, we first show that in a Poison-distributed ad hoc network, if DPC is properly designed with a certain condition satisfied, it can strictly work better than constant power control (i.e. no power control) in terms of average signal-to-interference ratio, outage probability and spatial reuse. This motivates us to propose an $N$-layer DPC scheme in a wireless clustered ad hoc network, where transmitters and their intended receivers in circular clusters are characterized by a Poisson cluster process (PCP) on the plane $\mathbb{R}^2$. The cluster of each transmitter is tessellated into $N$-layer annuli with transmit power $P_i$ adopted if the intended receiver is located at the $i$-th layer. Two performance metrics of transmission capacity (TC) and outage-free spatial reuse factor are redefined based on the $N$-layer DPC. The outage probability of each layer in a cluster is characterized and used to derive the optimal power scaling law $P_i=Θ\left(η_i^{-\fracα{2}}\right)$, with $η_i$ the probability of selecting power $P_i$ and $α$ the path loss exponent. Moreover, the specific design approaches to optimize $P_i$ and $N$ based on $η_i$ are also discussed. Simulation results indicate that the proposed optimal $N$-layer DPC significantly outperforms other existing power control schemes in terms of TC and spatial reuse.

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