卫星认知无线电CDMA上行链路功率控制

功率控制和动态频谱接入是提高卫星通信中频谱利用率的关键技术。非注册用户以频谱租赁方式可对注册用户付出的代价进行补偿，亦可完成自身通信需求。针对注册用户和非注册用户给出不同的效用函数，对由两种用户作为参与者建立的博弈模型进行纳什均衡求解，之后通过最大化系统容量条件完成效用占优选择，得到最优化功率分配策略。该策略可满足两种用户自身需求，亦可使系统通信容量最大。对于其性能，给出了两种用户数量和发送功率的关系，仿真结果表明，非注册用户数量在系统容限内愈多则系统总容量愈大，注册用户所要求的最低信干噪比则在一定范围内最佳。

Uplink power control for CDMA satellite cognitive radio

Power control and dynamic spectrum access are key technologies for improving spectrum utilization ratio in satellite communication. Primary users are rewarded for allowing secondary users to communication in their licensed spectrum by dynamic spectrum leasing. A game theoretic framework with primary users and secondary user as players and with two different utility functions is developed. An optimal power allocation strategy that could satisfy both types of users and could max system throughput by payoff dominance selection of Nash equilibrium is addressed. The relation between users number and transfer power is performed, and simulation results show the increase of the secondary users number that system could afford and the minimum SINR required by primary users within the confines of a certain extent could enhance system throughput.