潜铺型卫星认知通信中上行链路功率控制  

Uplink power allocation of satellite underlay cognitive radio

作　　者：陈鹏[1] 邱乐德[2] 王宇[1] 

机构地区：[1]中国空间技术研究院西安分院,陕西西安710100 [2]中国空间技术研究院,北京100094

出　　处：《电子技术应用》2012年第12期109-113,共5页Application of Electronic Technique

摘　　要：针对卫星通信中存在有效信道远小于注册频率的情况,提出了以潜铺型认知无线电为技术依靠的卫星上行链路功率控制算法。该算法以次要用户所获吞吐量与付出代价之差为效用函数,通过次要用户作为参与者建立的博弈模型进行纳什均衡求解,得到最优功率分配策略。该策略可满足次要用户自身需求,亦不影响主要用户系统正常通信,能有效提高频带使用率。在性能方面,指出了次要用户系统容量和预留信噪比的关系。仿真结果表明,在主要用户系统容许范围内次要用户数量越多则其系统吞吐量和系统收益越大,最后讨论了算法的实现复杂度。In this paper, we develop scheme for uplink power allocation based on underlay cognitive radio technology in case of frequency underutilization. We address a game theoretic framework with secondary user as players and with the difference between throughput and price as utility function. By finding Nash Equilibrium, we gain the optimal power allocation strategy that could enhance frequency utilization and could protect primary users from infection by secondary users. We perform the relation between secondary users number and system performances, and then, we also show the connection between reserved SINR for primary users and secondary system capability for users access. Simulation results show the increase of secondary users number that system could afford could enhance system throughput and income. The complexity is also discussed.

关 键 词：卫星通信 潜铺认知无线电 上行链路 功率控制 博弈论 纳什均衡 

分 类 号：TN927.23[电子电信—通信与信息系统]