CR-MIMO-OFDMA/TDM系统中基于效用的无线资源分配与调度  

Utility-based resource allocation and scheduling for CR-MIMO-OFDMA/TDM system

作　　者：胡浩[1] 宋俊德[2] 慈松[1] 唐晖[1] 

机构地区：[1]中国科学院声学研究所,北京100190 [2]北京邮电大学计算机学院,北京100876

出　　处：《通信学报》2010年第7期1-8,共8页Journal on Communications

基　　金：国家高技术研究发展计划("863"计划)基金资助项目(2009AA011804);国家科技重大专项基金资助项目(2009ZX03007-004;2009ZX03003-007)~~

摘　　要：针对多用户MIMO-OFDMA/TDM认知无线电系统,提出一种基于用户效用和最大化的动态资源分配与调度方案,通过松弛约束条件将NP-hard的组合最优化问题转化为凸优化问题并通过拉格朗日对偶法进行分解,利用次梯度迭代算法求解对偶问题求得原始问题最优解。仿真结果表明,该方案可最大化用户效用和,获得主用户与认知用户的最优功率/速率分配并实现用户调度,且算法复杂度低收敛速度快。A novel dynamic resource allocation and scheduling scheme based on user sum-utility maximization in multiuser MIMO-OFDMA cognitive radio system was proposed.After being transformed into a convex optimization problem via relaxation method,the NP-hard combinatorial optimization problem could be solved by a Lagrangian primal-dual approach.The optimal solution of the primal problem could be obtained through a sub-gradient iterative algorithm.Simulation results indicate that the propositional algorithm converges to optimal power/rate allocation for primary users and cognitive radio users with maximal sum-utility and achieves optimal user scheduling with low complexity and fast convergence speed.

关 键 词：认知无线电 多输入多输出 正交频分多址 动态资源分配与调度 

分 类 号：TN929.5[电子电信—通信与信息系统]