【摘要】 无线自组织网络是没有预置基础设施支撑的自组织可重构的自治网络。由于需要克服远近效应问题、干扰问题以及提高信道的空间复用度,并且为了降低网络节点的能耗,提高网络的生存时间和系统的能量效率,网络节点的发射功率受到限制。因此,如何在功率受限的情况下保证网络数据传输性能,成为无线网络的关键问题。提出了功率受限的无线自组织网络模型,该模型用发送功率的凸函数作为度量效用的指标之一,更加贴切地反映了网络节点功率受限的特点。采用对偶分解的方法求解模型,得到分布式算法,协调节点的传输功率和数据速率,达到全网效用最大化。最后用具体的拓扑和效用函数进行仿真,验证了算法的收敛性,并考察传输速率和功率的关系对网络性能的影响。更多还原

【Abstract】 Wireless Ad-hoc network is composed by wireless nodes with the ability of sensing,data processing and wireless communications which can work in a self-organization manner.To solve Near-far effect and interference problem,to increase the spatial reuse of spectrum,and to reduce the consumed energy,increase the network lifetime,the transmi-ssion power of network nodes was constrained.How to satisfy data transmission requirement with constrained power is an important problem in wireless neworks.This paper proposed a new model for power-constrained wireless ad-hoc networks.In the model,the convex function of power was taken into consideration to measure the network utility.Dual decomposition technology was adopted to solve the optimization problem.Through solving the model,a distributed power and rate control algorithm had been achieved;numerical simulation shows the convergence of the proposed algorithm,and investigates the effect of the relationship between transmission power and data rate.更多还原