| 摘要: |
| 考虑到无线电频谱资源日益紧缺，提出了一种基于组间组内协作传输的多播组新机制，涉及多个多播组并使用同一频谱资源以协作方式传输信息。基于认知无线网络中该机制，研究了系统的资源优化配置，理论分析得出了功率分配方案，进而讨论了系统加权总传输速率的优化，同时考虑了主用户和认知用户之间信号干扰及功率限制对传输速率的影响，最优化用户性能。仿真结果表明，优化方案下多播组传输速率随用户人数的增加而上升，达到最优化用户服务质量；当功率限制时，通过设置加权因子，能够保证主用户拥有良好的通信性能。 |
| 关键词: 认知无线电网络 多播组 干扰限制 功率优化 资源优化配置 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（61271421） |
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| Optimal resource allocation for cognitive radio networks with multi-group multicast |
| SHI Lulu,YANG Shouyi,ZHANG Ruizhe,LI Yan |
| () |
| Abstract: |
| For the increasing shortage of radio spectral resource,a new multi-group multicast(MGMC) mechanism based on inter-group and inner-group cooperative transmission is proposed,which relates to multiple multicast groups and uses the same spectrum resource to transmit information in a cooperative way. In cognitive radio(CR) network based on this new transmission mechanism,the optimal resource allocation of system is presented. The power allocation scheme is derived from theoretical analysis,and then the optimization of system weighted overall rate is discussed. Moreover,the impact of the signal interference between primary user(PU) and CR users and the power constraint on the transmission rate is considered to optimize user performance.Simulation result indicates that the transmission rate of multi-group multicast rises with the increasing number of users,and optimal user quality of service(QoS) is achieved;when power is constrainted,the PU can be ensured to have good communication performance by setting weighted factors for every multicast group. |
| Key words: cognitive radio network multi-group multicast interference constraint power optimization optimal resource allocation |
