期刊文献+
共找到14篇文章
< 1 >
每页显示 20 50 100
蜂窝网络中基于D2D用户总能量效率保证的资源分配策略
1
作者 易海岷 何小利 +2 位作者 李宏伟 尹晓冬 曾震 《长江信息通信》 2024年第3期133-137,共5页
在基于终端直连(D2D)通信的蜂窝网络中,文章提出了一种基于D2D用户能量效率保证的资源分配策略,我们的目标是尽量增大系统传输速率,并在同一时间,保证目标D2D用户能量效率。在文章提出的策略的第一阶段,采用加权二分匹配算法最大化系统... 在基于终端直连(D2D)通信的蜂窝网络中,文章提出了一种基于D2D用户能量效率保证的资源分配策略,我们的目标是尽量增大系统传输速率,并在同一时间,保证目标D2D用户能量效率。在文章提出的策略的第一阶段,采用加权二分匹配算法最大化系统传输速率,在目标D2D用户能效需求较低时,一阶段也可以满足需求,但D2D用户总能效需求变高时就需要进入第二阶段。因此,在第二阶段,先利用加权二分匹配算法最大化D2D用户能效并得到初始复用策略,然后使用局部搜索技术来改善初始复用策略。仿真结果表明,与已存在的基准策略相比,所提出的策略能够保证D2D用户能效并获得较高的系统传输速率性能收益。 展开更多
关键词 D2D 系统传输速率 D2D用户能量效率 加权二分匹配算法
下载PDF
MDT5.0新增功能与优点(三) 提高用户设计效率
2
《计算机辅助设计与制造》 2001年第1期83-85,共3页
关键词 应用软件 MDT5.0 用户设计效率 工程制图
下载PDF
TD-LTE系统3D-MIMO多用户性能研究 被引量:3
3
作者 姜雍 王亚峰 《现代电信科技》 2014年第4期19-24,共6页
根据3GPP RAN1会议达成的协议,基于TDLTE-Advanced系统建立3D信道模型。结合3DMIMO多用户(MU)配对调度传输、信道质量指示(CQI)的计算和反馈等关键技术,对TD-LTE-Advanced系统中的3D-MIMO关键性能指标进行评估。仿真结果表明,在不同场... 根据3GPP RAN1会议达成的协议,基于TDLTE-Advanced系统建立3D信道模型。结合3DMIMO多用户(MU)配对调度传输、信道质量指示(CQI)的计算和反馈等关键技术,对TD-LTE-Advanced系统中的3D-MIMO关键性能指标进行评估。仿真结果表明,在不同场景、不同传输模式、不同天线配置下,3D-MIMO的小区平均频谱效率(ASE)和边缘频谱效率(ESE)相对于2D-MIMO有较大提升。 展开更多
关键词 TD-LTE-Advanced 3D-MIMO 用户 频谱效率
下载PDF
基于多维度数据的无线网效能评价及改善体系研究
4
作者 邓智群 杜呈旭 《移动通信》 2016年第4期58-63,共6页
通过研究无线网用户侧(B侧)和网络侧(O侧)多维度数据,选取其中关键指标进行基于大数据系统的数据联合分析,建立网络效能评价体系,对网络进行综合评判,给出具有针对性的改善建议,从而提升整网的效益和效率。现网实践表明该评价体系可有... 通过研究无线网用户侧(B侧)和网络侧(O侧)多维度数据,选取其中关键指标进行基于大数据系统的数据联合分析,建立网络效能评价体系,对网络进行综合评判,给出具有针对性的改善建议,从而提升整网的效益和效率。现网实践表明该评价体系可有效解决低效能基站定位问题并可提供具有参考性的解决方案。 展开更多
关键词 网络效能 用户效率 区域价值 精细化评价管理 B+O联合分析
下载PDF
Energy Efficient Power Allocation for Relay-Aided D2D Communications in 5G Networks 被引量:13
5
作者 Ru Wang Jia Liu +2 位作者 Guopeng Zhang Shuanghong Huang Ming Yuan 《China Communications》 SCIE CSCD 2017年第6期54-64,共11页
As one of the key technologies for the fifth generation(5G) wireless networks,device-to-device(D2D) communications allow user equipment(UE) in close proximity to communicate with each other directly.Forwarded by a rel... As one of the key technologies for the fifth generation(5G) wireless networks,device-to-device(D2D) communications allow user equipment(UE) in close proximity to communicate with each other directly.Forwarded by a relay,the relay-aided D2D(RA-D2D) communications can not only be applied to communications in much longer distance but also achieve a high quality of service(Qo S) .In this paper,we first propose a two-layer system model allowing RA-D2 D links to underlay traditional cellular uplinks.Then we maximize the energy efficiency of the RA-D2 D link while satisfying the minimum data-rate of the cellular link.The optimal transmit power at both D2 D transmitter and D2 D relay sides is obtained by transforming the nonlinear fractional programming into a nonlinear parameter programming.Simulation results show that our proposed power allocation method is more energy efficient than the existing works,and the proposed RA-D2 D scheme outperformed direct D2 D scheme when the distance between two D2 D users is longer. 展开更多
关键词 D2D communication relay-aided underlay green communication energy efficiency power allocation
下载PDF
Spectral and Energy Efficiency of Downlink MU-MIMO Systems with MRT 被引量:4
6
作者 Weiqiang Tan Shi Jin Jide Yuan 《China Communications》 SCIE CSCD 2017年第5期105-111,共7页
This paper studies the achievable spectral efficiency(SE)of downlink multiuser multiple-input-multiple-output(MIMO)system,where the base station(BS)is deployed an arbitrary finite antenna number and communicates simul... This paper studies the achievable spectral efficiency(SE)of downlink multiuser multiple-input-multiple-output(MIMO)system,where the base station(BS)is deployed an arbitrary finite antenna number and communicates simultaneously with many users. We assume that the BS has accurate channel state information(CSI)and adopt maximum ratio transmission(MRT)precoding. An accurate analytical result for the achievable SE is obtained. Based on the analytical result on the achievable SE,we further study the achievable energy efficiency(EE)of multiuser MIMO system by considering an energy consumption model. Results indicate that the increasing number of BS antennas can boost the achievable SE of system,whilst the achievable SE tends to a saturated rate in the high signal-tonoise ratios(SNR)regime. Furthermore,an important conclusion is that the increasing number of users is beneficial for the achievable EE and there is an optimal antenna number to maximize the EE of system. 展开更多
关键词 energy efficiency multiuser MIMO maximum ration transmission spectral efficiency
下载PDF
Broadband & Digital Content-Couple Subscriber Cooperative Relaying Networks for Uplink Transmission using Hierarchical Game Approach 被引量:3
7
作者 Song Meil Teng Yinglei Niu Fang Zhang Yong Wang Li 《China Communications》 SCIE CSCD 2010年第2期16-31,共16页
Cooperation allows wireless network users to benefit from various gains such as an in- crease in the achieved rate or an improvement in the bit error rate. In the paper, we propose a distributed Hierarchical Game (HG... Cooperation allows wireless network users to benefit from various gains such as an in- crease in the achieved rate or an improvement in the bit error rate. In the paper, we propose a distributed Hierarchical Game (HG) theoretic framework over multi-user cooperative communication networks to stimulate cooperation and improve the network performance. First, we study a two- user decision making game in the OFDMA based subscriber cooperative relaying network, in which subscribers transmit their own data in the first phase, while helping to retransmit their partner's or choosing to freeride in the second phase. Instead of consulting to a global optimal solution, we decouple the cooperation resource allocation into two level subproblems: a user level Nash game for distributed cooperation decision and a Base Station (BS) level coalition game for centralized resource allocation. In the proposed HG algorithm, where mutual cooperation is preferred and total payoff is transferable, we prove it converges to a unique optimal equilibrium and resolve the subcarrier as-signment and power allocation among the couples. Besides, we discuss the existence of the publishing and rewarding coefficients in order to encourage cooperation. Then, we extend the HG to multi-user cases by coupling among subscribers according to the location information. The simulation results show that the proposed scheme with the distributed HG game achieves a well tradeoff between fairness and efficiency by improving the transmission efficiency of adverse users and outperforms those employing centralized schemes. 展开更多
关键词 cooperative relay hierachical game infrastructure relay subscriber relay Nash Equilibrium
下载PDF
Energy Efficient Switch Policy for Small Cells 被引量:1
8
作者 GAN Xiaoying WANG Luyang +4 位作者 FENG Xinxin LIU Jing YU Hui ZHANG Zhizhong LIU Haitao 《China Communications》 SCIE CSCD 2015年第1期78-88,共11页
Switch policy is essential for small cells to properly serve variable number of users in an energy efficient way.However,frequently switching small cell base stations(SBSs) may increase the network operating cost,espe... Switch policy is essential for small cells to properly serve variable number of users in an energy efficient way.However,frequently switching small cell base stations(SBSs) may increase the network operating cost,especially when there is an nonnegligible start-up energy cost.To this end,by observing the variety of user number,we focus on the design of a switch policy which minimize the cumulative energy consumption.A given user transmission rate is guaranteed and the capability of SBSs are limited as well.According to the knowledge on user number variety,we classify the energy consumption problem into two cases.In complete information case,to minimize the cumulative energy consumption,an offline solution is proposed according to critical segments.A heuristic algorithm for incomplete information case(HAIIC) is proposed by tracking the difference of cumulative energy consumption.The upper bound of the Energy Consumption Ratio(ECR) for HAIIC is derived as well.In addition,a practical Q-learning based probabilistic policy is proposed.Simulation results show that the proposed HAIIC algorithm is able to save energy efficiently. 展开更多
关键词 heterogeneous network small cell switch policy Q-LEARNING
下载PDF
Joint Dynamic Clustering and User Scheduling for Downlink Cloud Radio Access Network with Limited Feedback 被引量:2
9
作者 XU Dongyang REN Pinyi +1 位作者 DU Qinghe SUN Li 《China Communications》 SCIE CSCD 2015年第12期147-159,共13页
In limited feedback-based CloudRAN(C-RAN) systems,the inter-cluster and intra-cluster interference together with the quantification error can seriously deteriorates the system spectral efficiency.We,in this paper,prop... In limited feedback-based CloudRAN(C-RAN) systems,the inter-cluster and intra-cluster interference together with the quantification error can seriously deteriorates the system spectral efficiency.We,in this paper,propose an efficient three-phase framework and corresponding algorithms for dealing with this problem.Firstly,a greedy scheduling algorithm based on the lower bound of the ergodic rate is performed for generating an elementary cluster in the first phase.And then the elementary cluster is divided into many small clusters according to the following proposed algorithms based on the short term instantaneous information in the second phase.In the end,based on the limited feedback two zero-forcing(ZF) precoding strategies are adopted for reducing the intra-cluster interference in the third phase.The provided Monte Carlo simulations show the effectiveness of our proposed algorithms in the respect of system spectral efficiency and average user rate. 展开更多
关键词 Scheduling seriously clustering elementary scheduling Feedback generating greedy dealing fading
下载PDF
User Preference Survey on Staircase Rotation
10
作者 Ping An Biao Wang 《Journal of Civil Engineering and Architecture》 2015年第7期836-844,共9页
Staircase is an important means of vertical transportation. Staircase design exerts a great influence on the aesthetics, transportation efficiency, user comfort and experience level. In this paper, a survey on the sta... Staircase is an important means of vertical transportation. Staircase design exerts a great influence on the aesthetics, transportation efficiency, user comfort and experience level. In this paper, a survey on the staircase rotation preference was conducted, based on the environment behavior studies. Different user frequencies of a pair of scissors stairs in the 2nd teaching building of North China University of Technology were analyzed. The psychological effect was evaluated and quantified, and the user preference on the two staircase rotations was then withdrawn. The survey found that the type of staircase with clockwise upstairs was much more preferred (78%) than the other staircase rotation anti-clock upstairs. Considering different genders, the female shows a 66% higher preference inclination of this type of staircase rotation than the male. To improve the transportation efficiency of the staircase in case of fire, the result of this paper can be very constructive for the evacuation staircase rotation choice for the high-rise buildings. 展开更多
关键词 Evacuation stairs staircase rotation user preference environmental behavior.
下载PDF
Service Model Transformation of the Standards Library in the Network Environment
11
作者 魏利伟 《China Standardization》 2012年第1期52-53,共2页
In the network environment, changes of resources structure, information technology and users requirements of standards library cause series of problems such as unobvious effect of services, low efficiency of resource ... In the network environment, changes of resources structure, information technology and users requirements of standards library cause series of problems such as unobvious effect of services, low efficiency of resource utilization, poor innovation ability, etc. And we point out the problems and challenges faced by traditional standards library in the network environment. The standards library must redesign the organization structure and business process radically so that standards library could improve the service model, enhance the service quality and utilization rate of various document resources. 展开更多
关键词 Network Environment Knowledge Economy Standards Library.
下载PDF
提高集中供热系统能源利用效率的途径 被引量:5
12
作者 綦升辉 王新雷 韩瑞香 《煤气与热力》 2008年第12期31-33,共3页
通过对我国社会能耗、建筑能耗及供热能耗数据的分析,阐述了供热节能的重要性。从提高热源效率、热网效率、热用户效率3个方面分析了提高集中供热系统能源利用效率的途径。
关键词 集中供热系统 能源利用效率 热源效率 热网效率 用户效率
下载PDF
A social tag clustering method based on common co-occurrence group similarity 被引量:6
13
作者 Hui-zong LI Xue-gang HU +2 位作者 Yao-jin LIN Wei HE Jian-han PAN 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2016年第2期122-134,共13页
Social tagging systems are widely applied in Web 2.0.Many users use these systems to create,organize,manage,and share Internet resources freely.However,many ambiguous and uncontrolled tags produced by social tagging s... Social tagging systems are widely applied in Web 2.0.Many users use these systems to create,organize,manage,and share Internet resources freely.However,many ambiguous and uncontrolled tags produced by social tagging systems not only worsen users' experience,but also restrict resources' retrieval efficiency.Tag clustering can aggregate tags with similar semantics together,and help mitigate the above problems.In this paper,we first present a common co-occurrence group similarity based approach,which employs the ternary relation among users,resources,and tags to measure the semantic relevance between tags.Then we propose a spectral clustering method to address the high dimensionality and sparsity of the annotating data.Finally,experimental results show that the proposed method is useful and efficient. 展开更多
关键词 Social tagging systems Tag co-occurrence Spectral clustering Group similarity
原文传递
Bounding the Inefficiency of the C-Logit Stochastic User Equilibrium Assignment 被引量:3
14
作者 YONG Gui HUANG Haijun +1 位作者 LIU Tianliang XU Yan 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2016年第6期1629-1649,共21页
Compared with standard logit-based stochastic user equilibrium assignment model,the C-logit model describes route choice behavior in a more realistic way by considering the overlapping effect between routes.This paper... Compared with standard logit-based stochastic user equilibrium assignment model,the C-logit model describes route choice behavior in a more realistic way by considering the overlapping effect between routes.This paper investigates the inefficiency upper bounds of this model against the deterministic system optimum and the C-logit stochastic system optimum in terms of the total network travel time.It is found that the commonality factor of overlapping routes significantly affects the inefficiency bound,besides link congestion degree,total demand and the number of feasible routes.If the commonality factor is not considered,the efficiency loss resulting from selfishly stochastic travel behavior will be to large extent underestimated. 展开更多
关键词 Inefficiency bounding logit-based stochastic user equilibrium route overlapping.
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部