Downlink Power Allocation of Satellite Underlay Cognitive Radio
In this paper,we consider power control problem for a secondary cognitive satellite network to reuse the underutilized spectrum which is licensed by an existing primary system.Secondary users can be allocated power provided that the interference caused by secondary system to any primary user is below a critical threshold.We focus on the downlink.We formulate the problem as a game theoretic problem with the participants in cognitive network as the players.We propose an optimal control scheme that can be accepted willingly by secondary users and can maximize the spectrum utilization for satellite communication.By calculating Nash Equilibrium iteratively and using payoff dominance selection,we address the optimal power allocation within the constraints including quality of service protection for all users and maximum transmission power of the onboard power amplifier.Simulation is preformed to study the performances of both networks and of each user.We find that throughput and spectrum efficiency is greatly increased by the proposed scheme compared with traditional satellite networks where fixed power is allocated to only primary users.Also,the complexity is analyzed.
satellite communication underlay cognitive radio power control downlink spectrum utilization Nash Equilibrium
Peng Chen Lede Qiu Yu Wang
China Academy of Space Technology(Xian)Xian 710100, China China Academy of Space Technology Beijing 10009, China
国际会议
2012 IEEE 14th International Conference on Communication Technology(2012年第十四届通信技术国际会议(ICCT 2012))
成都
英文
445-451
2012-11-09（万方平台首次上网日期，不代表论文的发表时间）