基于OFDM的协同认知网络跨层资源调度  

Cross-layer Resource Scheduling in OFDM-based Cooperative Cognitive Radio Networks

作　　者：刘忠军[1] 徐友云[1,2] 张冬梅[1] 宫兵[1] 

机构地区：[1]解放军理工大学通信工程学院,南京210007 [2]上海交通大学电子工程系,上海200240

出　　处：《电子与信息学报》2011年第7期1556-1560,共5页Journal of Electronics & Information Technology

基　　金：国家973计划项目(2009CB3020402);国家863计划项目(2009AA01Z249)资助课题

摘　　要：协同通信与认知无线电是未来移动通信的重要技术。针对基于OFDM的无线协同认知网络中的资源分配问题,该文提出了一种有效的跨层资源调度方案。该调度方案在考虑对主用户所受干扰功率进行控制的前提下,以最大化认知用户超帧中总的传输速率为目标,在调度帧中对各传输帧两阶段的子载波进行最佳配对,并为配对子载波分配最优的发送功率。通过分步求解的方法,该调度方案形成的优化问题得到有效解决。仿真结果表明该资源调度方案使得认知用户传输速率有显著提升,方案的可行性与有效性得到了验证。Cooperative communication and cognitive radio are the key candidates for the future mobile communication technologies.Focusing on the resource allocation issue in OFDM-based cooperative cognitive radio networks,an efficient cross-layer scheduling scheme is proposed.In the scheme,while taking strict interference control to protect the primary user,the most appropriate subcarrier pairs for the two phases transmission in each frame as well as optimal power is allocated to obtain a maximal rate during a superframe＇s transmission.The optimization issue for scheduling scheme is solved effectively with a decomposition method.Simulation results indicate that the proposed cross-layer scheduling scheme brings a notable increase in the transmission rate,which confirms the feasibility and validity of the proposed scheduling scheme.

关 键 词：协同通信 认知无线电 OFDM 资源分配 跨层调度 

分 类 号：TN929.5[电子电信—通信与信息系统]