摘要
感知无线电(CR)网络中的机会频谱接入(OSA)可以有效提高频谱的利用率。研究了OSA中的信道分配和功率控制问题,通过将Overlay模式和Underlay模式相结合,求解了次用户吞吐量的最优化问题。在满足干扰温度约束的前提下,优化目标为所有次用户的带权速率之和,同时可提供QoS支持和最小速率保障。此优化问题可转化为二部图最大带权匹配问题并使用匈牙利方法进行求解。仿真结果显示,采用混合模式的信道分配和功率控制算法较单一模式可以获得更大的频谱资源利用率。
Opportunistic spectrum access（OSA） in cognitive networks significantly improves spectrum efficiency.We study the problems of channel allocation and power control in OSA.Considering both Overlay mode and Underlay mode,we address the optimization problem of maximizing secondary user throughput.Under the interference temperature constraint,the objective is to maximize the weighted sum rate of the cognitive radio network.Moreover,our approach provides diverse QoS support and the minimum data rate guarantee.The optimization problem can be converted to a maximum weighted bipartite matching problem thus solved by the Hungarian method.Simulation results demonstrate that the hybrid mode approach achieves better spectrum efficiency than single mode.
出处
《无线电工程》
2011年第10期47-49,共3页
Radio Engineering
关键词
认知无线电
资源分配
混合模式
优化
cognitive radio
resource allocation
hybrid mode
optimization
