摘要
分簇是Ad hoc网络规模较大时采用的主要结构,而频谱分配是Ad hoc网络的关键技术之一。该文针对认知无线电环境的分簇Ad hoc网络,提出了一种新的基于市场的频谱分配方案,该方案中簇首节点依据业务比例从频谱管理中心购买频谱,簇内采用基于供需市场理论的频谱分配算法。分析了簇内频谱市场的两种迭代定价算法额外需求迭代算法和连续松弛迭代算法以及簇首需求订购的过程。该方案能实现各簇收益的最大化,簇首基于需求的频谱购买相对于等量购买进一步提高了频谱效用。仿真结果表明这种频谱分配方案能有效提高系统频谱效用,额外需求迭代算法和连续松弛迭代算法均表现出良好的收敛性能。
Clustering is the main framework of large scale Ad Hoc networks,and one of its key technologies is spectrum allocation.In this paper,a novel three-level market-based scheme of spectrum allocation is proposed for cognitive clustered Ad Hoc networks.In this scheme,cluster headers buy spectrum from spectrum administrator of primary service according to the estimation of their demands,and a market-based algorithm which stems from microeconomic theory is adopted in the spectrum allocation within each cluster.An analysis is given on the iterative pricing algorithms of Excess Demand-Based （EDB） and Successive Over-Relaxation （SOR） for in-cluster market as well as on the process of spectrum purchase based on demand executed by cluster headers.The simulation results show that cluster profit is maximized by adopting the market-based algorithm,and that a significantly utility improvement is achieved by demand-based purchase of cluster headers compared with equal purchase.As a result,the spectrum allocation scheme proposed in this paper can improve the system performance efficiently.The convergence of EDB and SOR iterative algorithms is also proved by simulation.
出处
《电子与信息学报》
EI
CSCD
北大核心
2010年第3期643-648,共6页
Journal of Electronics & Information Technology
基金
国家自然科学基金(60772062)
国家重点基础研究发展计划项目(2007CB310607)
东南大学移动通信国家重点实验室开放研究基金(N200813)资助课题
关键词
认知无线电
频谱分配
额外需求迭代
连续松弛迭代
分簇Ad
HOC网络
Cognitive Radio
Spectrum Allocation
Excess Demand-Based（EDB） iteration
Successive Over- Relaxation （SOR） iteration
Clustered Ad hoc networks
