共查询到20条相似文献,搜索用时 15 毫秒
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为有效利用频谱资源,提高频谱效率,文中利用环境感知技术,设计出认知无线电跨层结构框架,提出一种新的功率控制博弈BPCG(Bandwidth and Power Control Game Algorithm)算法。研究不同用户的频谱带宽分配和功率控制,该算法在确保频谱带宽有效分配前提下,通过对用户功率的有效控制,实现网络总吞吐量的提高。仿真结果表明该算法在相同的功率消耗前提下,网络吞吐量显著提高,并随频谱带宽的增加,实现网络吞吐量的最大化。 相似文献
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针对多用户协作中继系统中的资源分配问题,提出了一种在满足用户速率比例公平约束条件下的新算法。该算法先将由2个时隙组成的中继用户传输链路转换为一个等效信道链路,将涉及子载波分配、中继选择和功率分配的组合优化问题转化为分步的次优化问题。该算法在等功率分配情况下,根据各用户速率比例公平系数进行初步子载波数目分配;以瞬时信道增益最佳原则,进行剩余子载波数目分配及具体子载波分配,同时完成中继选择;在速率比例公平约束条件下推导出次优化功率分配的闭式表达式,从而完成各子载波上的功率分配。仿真结果表明,该算法在有效提高系统容量的同时,保证了各用户速率之间的比例公平性。 相似文献
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为了满足无线数据流量大幅增长的需求,异构云无线接入网(H-CRAN)的资源优化仍然是亟待解决的重要问题。该文在H-CRAN下行链路场景下,提出一种基于深度强化学习(DRL)的无线资源分配算法。首先,该算法以队列稳定为约束,联合优化拥塞控制、用户关联、子载波分配和功率分配,并建立网络总吞吐量最大化的随机优化模型。其次,考虑到调度问题的复杂性,DRL算法利用神经网络作为非线性近似函数,高效地解决维度灾问题。最后,针对无线网络环境的复杂性和动态多变性,引入迁移学习(TL)算法,利用TL的小样本学习特性,使得DRL算法在少量样本的情况下也能获得最优的资源分配策略。此外,TL通过迁移DRL模型的权重参数,进一步地加快了DRL算法的收敛速度。仿真结果表明,该文所提算法可以有效地增加网络吞吐量,提高网络的稳定性。
相似文献6.
T. Renk C. Kloeck D. Burgkhardt F. K. Jondral D. Grandblaise S. Gault J.-C. Dunat 《Mobile Networks and Applications》2008,13(5):431-441
Regulation will experience enormous changes in the near future resulting in seamless connectivity by spectrum borders. A promising
approach in this context is dynamic spectrum allocation which leads to a more flexible access to spectral resources by employing
intelligent radio devices called cognitive radios. This paper is concerned with bio-inspired approaches that exploit distribution
in multi-radio environments where many users have to share a finite resource harmoniously. Three applications of bio-inspired
techniques are described. The first one deals with the detection of spectrum holes whereas the second one describes resource
allocation in orthogonal frequency division multiple access based systems. The third one is concerned with distributed resource
auctioning.
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J.-C. DunatEmail: |
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针对6G物联网中信道误差影响与用户采集能量的公平性问题,该文在用户信干噪比受限、发射功率约束和反射相位模一约束的条件下,研究了智能反射面(IRS)辅助的信息与能量同传(SWIPT)系统中公平性采集能量最大化问题。为了解决该非凸问题,分别运用Schur-Complement和S-Procedure将无限维约束转换为有限维的矩阵线性不等式,然后利用罚函数和连续凸逼近的方法将难以求解的原问题转化为标准的凸优化问题,进而提出了一种迭代的鲁棒公平性能量采集算法。数值结果表明,所提鲁棒优化算法能够明显提升网络采集的公平性能量。 相似文献
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在多用户正交频分复用(Orthogonal Frequency Division Muhiplexing,0FDM)系统中,系统容量和用户公平性不能同时兼顾,本文提出了一种综合考虑系统容量和用户公平性的资源分配算法.该算法利用多用户的分集增益,根据用户的实时信道状态和传输速率要求,合理的选择用户接人的时刻,既保证了用户公平性又提高了系统容量,达到时频二维空间优化系统的效果.仿真结果表明,本算法在不增加算法复杂度和不损失用户公平性的前提下,有效的提高了系统容量。 相似文献
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A cognitive engine with dynamic priority resource allocation (CE-DPRA) is proposed for wireless networks by utilizing a maximum
likelihood estimation method. The receiving signal strength (RSS) from an unlicensed cognitive radio (CR) user can be measured
through estimating the unknown position of a licensed mobile user. The priority algorithm for access control enables the selection
of a proper CR user waiting for transmission. Both data rate and spectral efficiency can be increased after adapting CE-DPRA.
Also the power constraint method can avoid excessive interference caused by signal transmitting from CR users so as to improve
the communication quality of mobile users. Simulation results show that the proposed CE-DPRA achieves the performance of high
transmission data rate, less interference power, and low average outage probability. 相似文献
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动态频谱分配技术是认知无线电的一项关键技术,本文针对以OFDM为传输技术的认知无线电系统,提出了固定速率认知用户和变速率认知用户并存情况下的动态频谱分配新算法。本文算法以最小化每比特发射功率为目标,运用最小最大准则与分步求解的方法,对系统目标函数予以简化,在最大公平意义上对认知小区的空闲频谱资源进行动态分配。仿真结果表明,该算法具有较好的公平性,在固定速率用户功率最小化需求和变速率用户吞吐量最大化的需求之间取得了比较好的平衡,适用于两种需求用户并存环境下的认知无线电系统。 相似文献
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将认知无线电技术与正交频分复用(OFDM)相结合是解决目前频谱资源匮乏的首选方案之一。通过采用多播技术, 将对同一内容感兴趣的用户作为一个多播组,为系统提供多播业务,使得相同的无线网络资源能够服务更多的用户,有效地利用有限的频谱资源以及发射功率,有效缓解目前频谱资源紧缺现状,具有重要意义。通过对认知 OFDM 系统的单播多播等方面进行归纳分析,介绍了不同的资源分配方法,研究了基于能量效率最大化的认知 OFDM 系统多播资源分配问题,并分析了解决方法,仿真结果表明该算法的有效性。 相似文献
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Nazir Mohsin Sabah Aneeqa Sarwar Sana Yaseen Azeema Jurcut Anca 《Wireless Personal Communications》2021,119(4):3529-3552
Wireless Personal Communications - Present-day wireless methods are necessary to support a variety of higher-speed data communication facilities for its subscribers such as cloud-based video... 相似文献
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Resource Allocation Algorithm for Multi‐cell Cognitive Radio Networks with Imperfect Spectrum Sensing and Proportional Fairness 下载免费PDF全文
This paper addresses the resource allocation (RA) problem in multi‐cell cognitive radio networks. Besides the interference power threshold to limit the interference on primary users PUs caused by cognitive users CUs, a proportional fairness constraint is used to guarantee fairness among multiple cognitive cells and the impact of imperfect spectrum sensing is taken into account. Additional constraints in typical real communication scenarios are also considered—such as a transmission power constraint of the cognitive base stations, unique subcarrier allocation to at most one CU, and others. The resulting RA problem belongs to the class of NP‐hard problems. A computationally efficient optimal algorithm cannot therefore be found. Consequently, we propose a suboptimal RA algorithm composed of two modules: a subcarrier allocation module implemented by the immune algorithm, and a power control module using an improved sub‐gradient method. To further enhance algorithm performance, these two modules are executed successively, and the sequence is repeated twice. We conduct extensive simulation experiments, which demonstrate that our proposed algorithm outperforms existing algorithms. 相似文献
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To solve the contradiction between limited spectrum resources and increasing communication demand, this paper proposes a wireless resource allocation scheme based on the Deep Q Network(DQN) to allocate radio resources in a downlink multi-user cognitive radio(CR) network with slicing. Secondary users(SUs) are multiplexed using non-orthogonal multiple access(NOMA). The SUs use the hybrid spectrum access mode to improve the spectral efficiency(SE). Considering the demand for multiple services, the ... 相似文献