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功率控制是感知无线电重配置的重要内容之一。结合功率控制的动态频谱分配策略可以有效提高频谱分配的性能。文章构建了一种潜博弈模型,通过在授权链路保护算法中加入功率控制机制,进一步降低对系统中授权用户和其它感知用户的干扰,提高通信链路的信干噪比,改善分配算法的性能。仿真结果表明算法达到了预期的效果,保证了感知无线电系统可靠通信。 相似文献
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认知无线电频谱分配的博弈论方法 总被引:2,自引:0,他引:2
认知无线电中频谱分配问题目前受到了极大的关注。在问题的分析中,涉及了大量策略选择问题,因而可以利用博弈论的相关原理对其进行分析研究。文章介绍了认知无线电频谱分配的一些关键问题,分析了博弈论方法在认知无线电研究中的应用条件,并阐述了认知无线电频谱分配问题的博弈论框架,为今后的相关研究起到积极的促进作用。 相似文献
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研究了在多主用户参与的完全竞争模式下的频谱价格问题,建立基于博弈理论的经济模型,分析主用户的频谱利润和频谱价格与认知用户的频谱需求之间的关系。考虑了主用户数、频谱替代因子和学习速率对频谱价格、纳什均衡、收敛性及稳定性的影响。仿真结果表明,合理的频谱价格及传输参数,可以使主用户获得的利润最大化,合理的学习速率可以使主用户的频谱价格快速收敛,通过有偿频谱共享,充分调动了主用户的积极性,从而有效的缓解了认知用户频谱资源紧张的局面。 相似文献
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基于博弈论的认知无线电频谱分配模型 总被引:3,自引:2,他引:1
基于博弈论的认知无线电频谱分配问题,是目前认知无线电领域的研究热点之一.文章首先阐述如何利用博弈论对认知无线电进行分析,提出算法设计需要解决的四个方面的基本问题.在此基础之上进一步提出了基于博弈论的认知无线电频谱分配问题模型,并重点对模型中效用函数的选择做了详细的探讨. 相似文献
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针对恶意干扰场景下无人机群动态频谱分配问题,构建了基于斯坦伯格博弈的动态频谱分配模型,干扰机为斯坦伯格博弈的领导者,无人机群为斯坦伯格博弈的跟随者,设计了不同博弈参与者的效益函数,并证明了该博弈存在稳定的斯坦伯格均衡解。在此基础上设计了一种分层动态频谱分配算法,针对领导者采用Q学习选择干扰信道的场景下,跟随者采用随机学习自动机来确定信道分配策略。仿真结果表明,所提算法能够得到无人机用户的最优信道分配策略,有效提升无人机用户的总吞吐量性能,实现效益最大化。 相似文献
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In adaptive channel allocation for secondary user(SU) of cognitive radio(CR) system,it is necessary to consider allocation process from the temporal perspective.In this article,a chain store game is modeled to achieve SU's equilibrium state.Due to the computational complexity of solving equilibrium states,the authors explore the correlated equilibrium(CE) by importing signal mechanisms based on time and sequence number.Also,correlated equilibrium based game algorithms are presented.Simulations show that the... 相似文献
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针对多用户多输入多输出( MU-MIMO)天线系统,提出了一种基于非合作博弈论的功率分配方案。此博弈模型中,以用户在系统中的信号泄漏噪声比值( SLNR)作为用户功率分配和公平性参数设置的依据,保证用户所期望的服务质量和公平性,并证明了纳什均衡的存在性。其次,考虑信道估计误差的影响,提出了一种基于滑动模型的迭代功率分配控制算法满足所有用户的最小通信质量要求。仿真结果显示此方案在信道误差的情况下,相比现有方案可提高系统吞吐量。 相似文献
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The invention of cognitive radio (CR) concept aims to overcome the spectral scarcity issues of emerging radio systems by exploiting under‐utilization of licensed spectrum. Determining how to allocate unused frequency bands among CR is one of the most important problems in CR networks. Because different CRs may have different quality‐of‐service requirements, they may have different objectives. In voice communication, high‐speed transmission is the most important factor; hence, voice radios always try to maximize their transmission rate. However, in data communication, the most important factor is the bit error rate. The data radios always try to maximize their signal‐to‐interference‐plus‐noise ratio (SINR). In this paper, two non‐cooperative games named interference minimization game and capacity maximization game, which reflect the target of data radios and voice radios, respectively, are proposed. From the simulations, after these games are applied, the average SINRs of all players at each channel are improved. The average SINR of players in each channel after applying the capacity maximization game is smaller than that after applying the interference minimization game. However, in comparison with that after applying the interference minimization game, the average capacity of players after applying capacity maximization approach is larger. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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为了提高认知无线网络中频谱共享所产生的效益,研究了认知网络的频谱管理技术,提出了一种基于代理的频谱交易算法。该方法以代理商作为频谱交易和分配的中介,减轻了多主用户、多次用户频谱交易过程中的系统开销;在各主用户服务提供商之间采取相互竞争或相互合作的模式以最大化自身利益或总体利益为目标与代理商达成最终的频谱交易价格和频谱出售量量,代理商把交易得来的频谱在次用户之间进行拍卖,各次用户向代理商投标,代理商根据其投标分配相应的频谱,次用户自适应地调整投标以使自身利益最大化。主用户服务提供商之间的竞争或合作和次用户之间的竞拍均采用纳什均衡作为最终的结果。基于MATLAB对所提算法的性能进行了仿真,仿真结果验证了该算法的有效性。 相似文献
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Dynamic spectrum access(DSA),consisting of spectrum sharing and spectrum trading stage,becomes a promising approach to increase the efficiency of spectrum usage and system performance.In this paper,from the perspective of individual interest optimization,we focus on strategy adaptation of network users and their interaction in spectrum trading process.Considering adverse effects on decision-making accuracy and the fairness among network users via local information acquirement,a hybrid game model based on global information of relevant spectrum is proposed to formulate intelligent behaviors of both primary and secondary users.Specifically,by using the evolutionary game theory,a spectrum-selection approach for the evolution process of secondary users is designed to converge to the evolutionary equilibrium gradually.Moreover,competition among primary users is modeled as a non-cooperative game and an iterative algorithm is employed to achieve the Nash equilibrium.The simulation results show that the proposed hybrid game model investigates network dynamics under different network parameter settings. 相似文献
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Heterogeneous networks are employed in the next generation communication systems to enhance the area spectral efficiency (ASE), where cell range extension (CRE) is a promising technique to improve the cell edge performance and utilize the low power node (LPN) resources more effectively. In this paper we propose a dynamic spectrum allocation scheme for Macro-Pico scenario to mitigate both the co-tier and cross-tier interferences. The available system spectrum is divided into different parts by four steps, i.e. user set partition, service request collection, cross-tier occupation and CRE occupation decision, while the service request of each user is taken into consideration. During the process implementation, the reference signal receiving power (RSRP) threshold is derived by mathematical means to judge cell edge macro users when a predefined ratio is given. Simulation results show that the proposed scheme reaches almost the same cell edge performance with the best existing option, meanwhile provides higher overall system throughput and better spectral efficiency. Therefore, much better balance is achieved. 相似文献
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中继蜂窝网络是近年来移动通信领域的热点,为了解决传统蜂窝网络的缺点,本文提出了在中继蜂窝网中基于功率控制的频谱分配方案,通过中继方式,解决了远近效应的问题,通过频率复用可以显著的提高系统频率资源利用率和系统性能,通过采用基站功率控制技术解决了由于资源复用带来的链路干扰过大问题。 相似文献