多输入多输出(MIMO)技术是突破香农(Shannon)容量限制的一项有效手段。而认知无线电(CR)是近几年的热点研究领域,它能够极大的提高网络资源使用效率。结合这两种技术,研究了基于MIMO的认知无线网络的跨层优化:路由选择、能量分配和带宽分配。采用对偶分解算法将主问题分解为网络层和物理层子问题,并提出了交替更新算法有效解决了物理层子问题。
Multiple-input multiple-output(MIMO) technology is an effective means of breaking the limited capacity of Shannon.The cognitive radio(CR) is a hot research field in recent,it can greatly improve efficiency in the use of network resources.This paper combines these two technologies,and concentrate on MIMO cognitive radio cross-layer optimization of wireless networks:routing,energy allocation and bandwidth allocation,and use the dual decomposition algorithm to decompose the master problem into the network layer and physical layer sub-problems.