基于空间位置的混合频谱共享系统功率分配研究  

Power allocation of hybrid spectrum sharing based on the spatial location

作　　者：蔡艳[1] 张晶[2] 朱洪波[1] 

机构地区：[1]南京邮电大学通信与信息工程学院江苏省无线通信重点实验室,江苏南京210003 [2]南京邮电大学电子科学与工程学院江苏省无线通信重点实验室,江苏南京210003

出　　处：《通信学报》2014年第2期104-110,共7页Journal on Communications

基　　金：国家重点基础研究发展计划("973"计划)基金资助项目(2013CB329005);江苏"973"基金资助项目(BK2011027);国家自然科学基金资助项目(61101104;61271237);南京邮电大学基金资助项目(NY211055)~~

摘　　要：针对次用户空间位置分布的随机性,提出空域混合Overlay/Underlay频谱共享模型以提高无线频谱利用率。根据次用户在不同空间位置对主用户的干扰,在主用户干扰容限约束下推导出次用户工作于Overlay状态和Underlay状态的空间区域;以最大化系统容量为准则建立认知系统功率优化分配模型,推导出次用户的最优功率分配方案,进而得到认知系统可获得的最大容量;理论和仿真结果表明,基于空间位置的混合频谱共享系统可以获得比Overlay系统更高的容量。Based on the random spatial location of the secondary user, a spatial hybrid spectrum sharing model which combines overlay with underlay was proposed to improve spectrum utilization, Considering the different location of sec- ondary user, the interference received by primary receiver was analyzed and the work regions of the overlay and underlay were deduced under the primary user average interference constraint. The power allocation model was built under the criterion of maximizing the system average （ergodic） capacity. Furthermore, the optimal power allocation scheme was deduced as well as the maximum achievable capacity of the spatial hybrid spectrum sharing system. Analysis and simula- tion results indicate the hybrid spectrum sharing system has higher capacity than single overlay system.

关 键 词：无线通信 频谱共享 认知无线电 功率分配 

分 类 号：TN92[电子电信—通信与信息系统]