| 认知无线电系统中一种新的自适应功率控制算法 |
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| 引用本文： | 罗荣华,杨震.认知无线电系统中一种新的自适应功率控制算法[J].信号处理,2010,26(8):1257-1262. |
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| 作者姓名： | 罗荣华 杨震 |
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| 作者单位： | 南京邮电大学信号处理与传输研究院 |
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| 基金项目： | 国家863项目，国家自然科学基金 |
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| 摘 要： | 本文针对认知无线电系统中的远近不公平性，提出将信道增益因子引入到基于信干比（SIR）的分布式非合作博弈功率控制算法中，并证明了其纳什均衡的存在性及唯一性。同时在此算法的基础上，针对部分用户的SIR不能满足下限阀值的情况，设计了一种新的自适应加权系数以控制发射功率，满足不同用户的输出SIR需求。仿真结果表明，与其它的分布式功率控制算法相比，该算法不仅有效地解决了远近不公平现象，满足了认知用户公平共享频谱资源的需求，同时使认知用户的SIR能同时满足上下限阀值的要求，且具有快速收敛的特性。
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| 关 键 词： | 认知无线电系统 远近不公平性 非合作博弈 功率控制 纳什均衡 |
| 收稿时间： | 2009-10-12 |
A Novel Adaptive Power Control Algorithm in Cognitive Radio System |
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| LUO Rong-hua,YANG Zhen.A Novel Adaptive Power Control Algorithm in Cognitive Radio System[J].Signal Processing,2010,26(8):1257-1262. |
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| Authors: | LUO Rong-hua YANG Zhen |
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| Affiliation: | The Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications |
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| Abstract: | For solving the near-far unfairness in cognitive radio system, the path gain factor was added on the pricing function in SIR-based (Signal-to-Interference Ratio) distributed non-cooperative game theoretic power control algorithm, and the existence and uniqueness of the Nash equilibrium are also proved. Meanwhile, based on this new power control algorithm, aiming at some secondary users’ SIR may be lower than the lowest threshold of SIR, a novel adaptive power control algorithm was proposed for cognitive radio system, and so, different secondary users’ SIR attain their individual SIR requirement. Simulation results show that the proposed algorithm can resolve the near far unfairness and regulate the transmitter power to meet the different SIR requirements of secondary users effectively, and furthermore, it can make different secondary users’ SIR satisfy the highest and the lowest threshold requirement of SIR with faster convergence compared with other classical SIR-based distributed non-cooperative game theoretic power control algorithms. |
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