CR系统中基于微分博弈的功率控制算法
doi: 10.3724/SP.J.1146.2008.01776
Power Control Algorithm Based on Differential Game for CR System
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摘要: 该文针对认知无线电系统动态性的特点，将微分博弈理论应用在认知无线电系统的功率控制中，建立了功率控制的非合作微分博弈模型，提出了一种基于微分博弈的分布式非合作功率控制算法。该算法在满足认知用户平均功率门限和QoS需求的基础上，实现了分布式动态功率控制，获得了反馈纳什均衡解析解。仿真结果表明，该算法可有效控制各认知用户的发射功率，增加系统吞吐量，提高系统性能。Abstract: Considering the dynamic nature in Cognitive Radio (CR) system, differential game theory is adopted in power control for CR system and a novel model of noncooperative differential game for power control is presented. Then a distributed noncooperative power control algorithm based on differential game is proposed in this paper. The proposed algorithm achieves the distributed dynamic power control under the condition that the requirements, including the average power threshold and QoS of secondary users, are guaranteed. Furthermore, an analytical solution to feedback Nash equilibrium is obtained. Simulation results show that the proposed algorithm can regulate the transmitted power of secondary users effectively to enhance the total throughput, and the performance of CR system is thereby improved.
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