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Documents 多跳无线网络中基于跨层优化的资源分配研究
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  • Author Author: sophie0love
  • Date Created: 28 Nov 2010 3:45 AM Date Created
  • Last Updated Last Updated: 9 Nov 2021 4:54 PM
  • Views 436 views
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多跳无线网络中基于跨层优化的资源分配研究

随着移动用户规模的增大,以及人们对移动业务的追求不断的提高,无线网络有限资源和传统网络模式制约着网络的性能。多跳无线网络和单跳无线网络相比,以其高可靠性、具有冲突保护机制、简单的链路设计、覆盖范围广的优点,越来越被人们所重视。OFDM作为一种多载波的调制技术,可以通过动态的子载波和功率分配,有效的增加系统容量和提高无线频谱的效率,它和多跳无线网络的结合也必然是无线通信技术发展的趋势。基于无线网络分层结构模型的动态资源分配因为无线介质的自然属性,如时变信道衰落,相互干扰,拓扑多样性,仍然不能对频谱资源和功率资源进行有效利用,因此,需要研究基于跨层结构的动态资源分配算法。 本文研究在采用OFDM技术多跳无线网络中,节点跨物理层-媒体接入层(PHY-MAC)的优化动态资源分配算法,目的是在多跳无线网络中利用层间信息的交互对每个节点的子载波和功率资源进行优化分配,达到整个网络的系统性能的提升。本文工作建立在多跳无线网络结构下,网络中每个节点采用OFDM调制技术,综合考虑PHY层和MAC层的信道状态信息及队列状态信息,根据无线信道状态的动态性,来动态选择自适应调制编码方式及分配子载波、功率分配等资源。本文分为单用户和多用户两种情况进行研究,在单用户情况下,节点采用跨层思想,对现有的基于效用函数的算法进行改进,提出了一种动态功率分配方法,使得网络性能得到提升。在多用户情况下,给出了一个基于跨层设计的多用户优化资源分配算法。算法以用户等待时间为QoS保证指标,根据该指标和传输速率的关系函数进行子载波和功率分配,以优化系统性能。 仿真结果和其他传统动态资源分配算法进行了一系列的比较。结果表明在单用户和多用户情况下,本文提出的算法对多跳无线网络的节点资源能进行优化分配,使网络性能得到改善。

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