检索结果-南通市图书馆

cognitive radio networks Using Intelligent Reflecting Surfaces

Computer Systems Science & Engineering 2022年第11期43卷 751-765页

作者： Raed Alhamad Information Technology Department Saudi Electronic UniversityRiaydhKingdom of Saudi Arabia

In this article,we optimize harvesting and sensing duration for cognitive radio networks(CRN)using Intelligent Reflecting Surfaces(IRS).The secondary source harvests energy using the received signal from node ***,it performs spectrum sensing to detect Primary Source PS *** PS activity is not detected,The Secondary Source SS transmits data to Secondary Destination SD where all reflected signals on IRS are in phase at *** show that IRS offers 14,20,26,32,38,44,50 dB enhancement in throughput using M=8,16,32,64,128,256,512 reflectors with respect to CRN without *** also suggested to add a second IRS between A and SS to increase the harvested *** use of 2 IRS with M1=8 reflectors in the first IRS and M2=8 reflectors in the second IRS offers 18 dB gain(respectively 32 dB)gain with respect to a single IRS with M2=8 reflectors(respectively without IRS).The use of 2 IRS with M1=16 reflectors in the first IRS and M2=8 reflectors in the second IRS offers 28 dB gain(respectively 42 dB)gain with respect to a single IRS with M2=8 reflectors(respectively without IRS).Our results are valid for Nakagami channels of fading figure *** also provide the throughput of IRS with energy *** have studied packet waiting time and total delay in the presence and absence or *** Signal to Noise Ratio(SNR)per bit equal to 0 dB,packet waiting time is 0.9 ms when there is no IRS and 0.5 ms when there is an IRS with M=8 *** SNR per bit equal to 0 dB,total transmission delay is 54 ms when there is no IRS and 1.5 ms when there is an IRS with M=8 *** show that the energy efficiency is larger when both harvesting and sensing durations are *** maximum of energy efficiency is 260 Mbit/s/Hz/J when harvesting and sensing durations are optimized while the maximum is 80 Mbit/s/Hz/J when harvesting and sensing durations are not optimized.

关键词： cognitive radio networks energy harvesting spectrum sensing throughput analysis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Robust beamforming for IRS-aided SWIPT in cognitive radio networks

引用

Digital Communications and networks 2023年第3期9卷 645-654页

作者： Zining Wang Min Lin Shupei Huang Ming Cheng Wei-Ping Zhu Yan Guo College of Telecommunications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing210003China Department of Electrical and Computer Engineering Concordia UniversityMontrealQCH3G 1M8Canada

Intelligent reflecting surface(IRS)is widely recognized as a promising technique to enhance the system perfor-mance,and thus is a hot research topic in future wireless *** this context,this paper proposes a robust BF scheme to improve the spectrum and energy harvesting efficiencies for the IRS-aided simultaneous wireless information and power transfer(SWIPT)in a cognitive radio network(CRN).Here,the base station(BS)utilizes spectrum assigned to the primary users(PUs)to simultaneously serve multiple energy receivers(ERs)and information receivers(IRs)through IRS-aided multicast *** particular,by assuming that only the imperfect channel state information(CSI)is available,we first formulate a constrained problem to maximize the minimal achievable rate of IRs,while satisfying the harvesting energy threshold of ERs,the quality-of-service requirement of IRs,the interference threshold of PUs and transmit power budget of *** address the non-convex problem,we then adopt triangle inequality to deal with the channel uncertainty,and propose a low-complexity algorithm combining alternating direction method of multipliers(ADMM)with alternating optimi-zation(AO)to jointly optimize the active and passive beamformers for the BS and IRS,***,our simulation results confirm the effectiveness of the proposed BF scheme and also provide useful insights into the importance of introducing IRS into the CRN with SWIPT.

关键词： cognitive radio networks Intelligent reflecting surface Simultaneous wireless information and power transfer Robust beamforming

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Reputation-based linear cooperation for spectrum sensing in cognitive radio networks

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第12期10卷 1688-1695页

作者： Hui-fang CHEN Xu JIN Lei XIE Department of lnformation Science and Electronic Engineering Zhejiang University Hangzhou 310027 China Zhejiang Provincial Key Laboratory of Information Network Technology Hangzhou 310027 China

We propose a reputation-based cooperative spectrum sensing scheme in cognitive radio (CR) networks to solve the uncertainty resulting from the multipath fading and shadowing effect. In the proposed scheme, each cooperative CR user has a reputation degree that is initialized and adjusted by the central controller, and used to weight the sensing result from the corresponding CR user in the linear fusion process at the central controller. A simple method for adjusting the reputation degree of CR users is also presented. We analyzed and evaluated the detection performance of the reputation-based cooperative spectrum sensing scheme. Simulation results showed that our proposed scheme alleviates the problem of corrupted detection resulting from destructive channel conditions between the primary transmitter and the CR user. The performance of our proposed scheme was improved compared to the average-based linear cooperation scheme, and was similar to that of the optimal linear cooperation scheme with feasible computational complexity. Moreover, our proposed scheme does not require knowledge of channel statistics.

关键词： cognitive radio networks Cooperative Reputation Spectrum sensing

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multiple Relay Selection Based on Game Theory in Cooperative cognitive radio networks

引用

Chinese Journal of Electronics 2017年第3期26卷 624-633页

作者： WU Renyong WANG Wenru LI Renfa The College of Information Science and Engineering Hunan University

Due to the inefficiency of traditional fixed spectrum allocation policies,the paradox of apparent spectrum scarcity occurs while most of the bands are *** has prompted proposals for Dynamic spectrum sharing(DSS),which explains why cognitive radio network(CRN)has been widely accepted as a promising approach to settle inefficient usage of scarce available radio *** a subset of DSS,Dynamic spectrum leasing(DSL)strategy has been proposed based on game idea,where Primary user(PU)has an incentive to allow cognitive users(CUs)to access its licensed spectrum for a fraction of time in exchange for *** paper proposes an approach,named multiple relay selection based on Game theory(GTMRS),to optimize the utilities of PU and CUs as a whole,where a pricing-based spectrum leasing mechanism is *** the parameter price c is jointly determined by PU and CUs,all selected cognitive user’s optimal cooperative powers can be satisfied through a non-cooperative game among *** results show that more CUs are involved in the cooperation and both utilities of PU and CUs as a whole are improved,which means the whole system throughput is increased.

关键词： cognitive radio networks Dynamic spectrum leasing Cooperative transmission Nash equilibrium

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Pricing Policy for a Dynamic Spectrum Allocation Scheme with Batch Requests and Impatient Packets in cognitive radio networks

引用

Journal of Systems Science and Systems Engineering 2022年第2期31卷 133-149页

作者： Haixing Wu Shunfu Jin Wuyi Yue School of Information Science and Engineering Yanshan UniversityQinhuangdao 066004China Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province Yanshan UniversityQinhuangdao 066004China Department of Intelligence and Informatics Konan UniversityKobe 658-8501Japan

In cognitive radio networks(CRNs),multiple secondary users may send out requests simultaneously and one secondary user may send out multiple requests at one time,i.e.,request arrivals usually show an aggregate ***,a secondary user packet waiting in the buffer may leave the system due to impatience before it is transmitted,and this impatient behavior inevitably has an impact on the system *** to investigate the influence of the aggregate behavior of requests and the likelihood of impatience on a dynamic spectrum allocation scheme in CRNs,in this paper a batch arrival queueing model with possible reneging and potential transmission interruption is *** constructing a Markov chain and presenting a transition rate matrix,the steady-state distribution of the queueing model along with a dynamic spectrum allocation scheme is derived to analyze the stochastic behavior of the ***,some important performance measures such as the loss rate,the balk rate and the average delay of secondary user packets are ***,system experiments are carried out to show the change trends of the performance measures with respect to batch arrival rates of secondary user packets for different impatience parameters,different batch sizes of secondary user packets,and different arrival rates of primary user ***,a pricing policy for secondary users is presented and the dynamic spectrum allocation scheme is socially optimized.

关键词： cognitive radio networks dynamic spectrum scheme batch arrival impatient packets Markov chain social optimization

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Secrecy outage analysis for underlay cognitive radio networks over correlated channels

引用

Science China(Information Sciences) 2017年第2期60卷 107-115页

作者： Jiliang ZHANG Hui ZHAO Gaofeng PAN Chongqing Key Laboratory of Nonlinear Circuits and Intelligent Information Processing School of Electronic and Information Engineering Southwest University

This paper investigates the secrecy outage performance of underlay cognitive radio networks, in which a source in a secondary system transmits its confidential information to a legitimate destination in the presence of an eavesdropper. Specifically, the main(the source-to-destination) and eavesdropping(the sourceto-eavesdropper) channels are assumed to be correlated. Moreover, it is also assumed that the main channel and the channel from the source to the primary user's receiver are correlated. Tight closed-form analytical expression for secrecy outage probability and the closed-form analytical expression for the probability of non-zero secrecy capacity are derived and validated by simulation results when the interference temperature limit is comparably large.

关键词： cognitive radio networks correlated fading channels probability of non-zero secrecy capacity secrecy outage probability

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Guaranteed Rendezvous Algorithms for cognitive radio networks

引用

China Communications 2018年第5期15卷 111-127页

作者： Li Gou Xiaohua Xu Chongqing Zhang Min Song Department of Computer Science Michigan Technological University Department of Computer Science Kennesaw State University College of Computer Science & Engineering Shandong University of Science and Technology

Rendezvous is a blind process establishing a communication link on a common channel between a pair of nodes in cognitive radio networks. We propose two guaranteed rendezvous algorithms for cognitive radio networks under both single-radio and multi-radio scenarios with an asynchronous setting. For single-radio scenario, each cycle length is a prime number associated with a channel hopping *** rendezvous can be guaranteed as long as the IDs of the two nodes are different. For multi-radio scenario, we propose a cycle length and rotation based rendezvous algorithm. Each node generates a channel hopping sequence with only one cycle length. Then these radios of each nodes rotate on the generated sequence with different rotation numbers at each hopping cycle. The rendezvous between two nodes is guaranteed as long as they have different cycle lengths or the same cycle length with different number of rotations. We conduct simulations on three metrics and the results show that the proposed algorithms outperform the existing ones.

关键词： cognitive radio networks blind rendezvous channel hopping cycle length

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dynamic control approaches of spectrum sensing in multi-band cognitive radio networks

引用

The Journal of China Universities of Posts and Telecommunications 2010年第5期17卷 20-25页

作者： AN Chun-yan JI Hong SI Peng-bo MAO Xu College of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China College of Electronics Information and Control Engineering Beijing University of Technology Beijing 100022 China

In this paper,the dynamic control approaches for spectrum sensing are proposed,based on the theory that prediction is synonymous with data compression in computational ***,a spectrum sensing sequence prediction scheme is proposed to reduce the spectrum sensing time and improve the throughput of secondary *** use Ziv-Lempel data compression algorithm to design the prediction scheme,where spectrum band usage history is *** addition,an iterative algorithm to find out the optimal number of spectrum bands allowed to sense is proposed,with the aim of maximizing the expected net reward of each secondary user in each time ***,extensive simulation results are shown to demonstrate the effectiveness of the proposed dynamic control approaches of spectrum sensing.

关键词： spectrum sensing sequence optimal number of spectrum bands cognitive radio networks Ziv-Lempel algorithm

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Joint channel selection and power control for video streaming over D2D communications based cognitive radio networks

引用

The Journal of China Universities of Posts and Telecommunications 2018年第1期25卷 1-14页

作者： Gao Ya Zhang Hailin Lu Xiaofeng State Key Laboratory of Integrated Services networks Xidian University College of Physics and Electronic Information Luoyang Normal University

A joint channel selection and power control scheme is developed for video streaming in device-to-device （D2D） communications based cognitive radio networks. In particular, physical queue and virtual queue models by applying ＇M/G/1 queue＇ and ＇M/G/1 queue with vacations＇ theories are built up, respectively, to evaluate the delays experienced by various video traffics. Such delays play a vital role in calculating the packet loss rate for video streaming, which reflects the video distortion. Based on the distortion model, a video distortion minimization problem is formulated, subject to the rate constraint, maximum power constraint, primary users＇ tolerant interference constraint, and secondary users＇ minimum data rate requirement constraint. The optimization problem turns out to be a mixed integer nonlinear programming （MINLP） , which is generally nondeterministic in polynomial time. A Lagrangian dual method is thus employed to reformulate the video distortion minimization problem, based on which the sub-gradient algorithm is used to determine a relaxed solution. Thereafter, applying the iterative user removal yields the optimal joint channel selection and power control solution to the original MINLP problem. Extensive simulations validate our proposed scheme and demonstrate that it significantly increases the peak signal- to-noise ratio （PSNR） compared with the existing schemes.

关键词： channel selection power control cognitive radio networks D2D communications video streaming convex optimization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An Effective Secure MAC Protocol for cognitive radio networks

引用

Computer Systems Science & Engineering 2022年第7期42卷 133-148页

作者： Bayan Al-Amri Gofran Sami Wajdi Alhakami Department of Information Technology College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia Department of Computer Science Joint First Year DeanshipUmm Al-Qura UniversityMakkah21955Saudi Arabia

The vast revolution in networking is increasing rapidly along with tech-nology advancements,which requires more effort from all cyberspace profes-sionals to cope with the challenges that come with advanced technology privileges and ***,cognitive radio Network is one of the promising approaches that permit a dynamic type of smart network for improving the utili-zation of idle spectrum portions of wireless ***,it is vul-nerable to security threats and attacks and demands security mechanisms to preserve and protect the cognitive radio networks for ensuring a secure commu-nication *** paper presents an effective secure MAC protocol for cognitive radio networks,signiﬁcantly enhancing the security level of the existing DSMCRN and SSMCRN protocols by eliminating the authentication server’s necessity,which can be a single point of failure to compromise the entire network *** proposed protocol has proven to be effective and reliable since it does not rely on a centralized entity for providing the required security for a single pair of cognitive *** protocol also improves the performance in the context of fast switching to data channels leading to higher throughput is achieved compared to the benchmark protocols.

关键词： cognitive radio networks shared key authentication elliptic curve cryptography throughput

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：