共查询到20条相似文献，搜索用时 31 毫秒
1.
对高速铁路下行MIMO-OFDM系统中的动态资源分配问题进行研究.联合考虑子载波、天线、时隙和功率,将多维资源分配问题建模为混合整数非线性规划问题.分析移动速度对多普勒频移的影响,并计算子载波间干扰功率.在总发射功率不超过一定阈值的约束条件下,将最大化系统吞吐量作为优化目标.为了降低求解最优化问题的计算复杂度,采用两步求解法得到次优解.首先,在等功率分配的前提下,将子载波、天线和时隙分配给不同用户.然后,根据第1步资源分配的结果,进行功率分配.仿真结果显示,提出的多维资源分配策略与已有策略相比在系统吞吐量方面具有较大的性能提高. 相似文献
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随着智能终端用户的大规模增长,迫切需要提高网络带宽和资源使用效率。5G网络中的认知D2D（device-to-device） 通信技术可直接通过通信设备建立通信链路,两个建立好链路的通信设备可直接通信,既能高效利用通信资源,又能满足爆发式增长的数据流量需求。如何进行通信资源管理及通信链路选择成为研究重点。基于5G网络的认知D2D通信技术提出了一种基于博弈论的信道分配方法,以解决资源分配问题,最大化D2D通信设备运行效率。将该方法与传统通信方法进行对比仿真,实验验证所提方法更加优越。 相似文献
3.
Wavelength and bandwidth allocation is important for multicast communication in optical networks. In this paper, a new method based on scheduling theory is proposed. The proposed method formulates wavelength bandwidth capacity as a large rectangle and these multicast stream bandwidth requirements as small rectangles. It treats the wavelength and bandwidth allocation question as a rectangle packing problem. The proposed algorithm solves the problem by taking quasi-human strategy with Euclidian distance. It is an effective heuristic algorithm to quickly solve multicast stream bandwidth allocation problem in optical networks by theoretic analysis. Further simulation experiments show the bandwidth allocation algorithm can increase network utilization and have a good fairness performance for unicast stream and multicast stream in optical networks. The results indicate the effectiveness of the algorithm. 相似文献
4.
Optimal resource allocation is critical to the efficiency of cooperative communications. In this paper, we develop an auction-based
power allocation mechanism for network-coded cooperation in wireless networks, in which the sources compete for the relay
power for maximum utility, while the relay node assigns the resource in accordance with the bids from the sources. Moreover,
to improve the resource utilization, the relay node is allowed to perform network coding across the received information for
the same destination. Finally, numerical results validate the performance of the proposed algorithm, and show that there exists
a tradeoff between the system outage probability and the power consumed at the relay node. 相似文献
5.
为了满足OFDMA-WLAN系统下行通信中多用户的不同业务需求,提出一种基于公平性和QoS服务保障的资源分配算法.不同的QoS要求被转换成不同的速率要求来计算QoS满意等级;优化目标被修改为公平性驱动的优化函数以提供公平性保障;复杂的资源分配问题被划分为信道分配和功率分配问题,并通过二分图匹配和注水法得到分配结果.与其他算法相比,所提出的算法牺牲了较少的数据速率换取更高的公平性和QoS满意度.仿真结果表明所提算法具有保障QoS和公平性的能力,且在QoS、公平性和速率之间权衡折中时表现更好. 相似文献
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研究了多用户场景下多载波码分多址系统（MC—CDMA）的下行信道和功率分配,并将吞吐最大化问题建模成一个混合整数优化问题．为了简化分析,将问题分成2个低复杂度的子问题：功率分配和信道分配．这2个子问题可分别被一个次最优自适应功率分配算法（APA）和一个最优自适应信道分配算法（ACA）解决．通过联合APA和ACA算法,进一步提出了一个自适应信道和功率的分配方案．仿真结果表明：与传统的均匀功率分配算法相比,提出的APA算法更加适用于MC—CDMA系统;此外,提出的自适应信道和功率分配方案可以显著地提高系统吞吐量性能． 相似文献
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随着物联网与大数据时代的到来,频谱资源日益紧缺。为缓解频谱资源紧张,提高频谱资源利用率,将D2D通信技术引入蜂窝网络,同时与NONA、EH、Relay等技术结合,通过合理的资源分配与功率控制,改善蜂窝通信网络服务性能,降低通信时延,提高频谱资源利用率。与传统蜂窝通信网络比,D2D通信技术加入蜂窝网络可扩大蜂窝网络覆盖范围,提高边缘用户吞吐量与蜂窝用户和D2D用户的吞吐量,具有广阔的应用前景。 相似文献
9.
CHAKARESKI Jacob 《浙江大学学报(A卷英文版)》2006,7(5):773-783
INTRODUCTION According to yearly statistics the demand for multimedia traffic over computer networks is con- stantly on the increase (Nielsen//NetRatings, http:// www.nielsen-netratings.com/). Therefore, it is inevi- table that situations where different media streams will need to share communication resources will be- come commonplace. In such cases, it would be of interest to optimize the overall performance of the network. In other words, resources should be allo- cated across the com… 相似文献
10.
云数据中心的资源分配是云计算应用的核心,它决定了用户任务执行的效率、系统的资源数与平台整体性能。文章首先指出在云计算中资源配置的必要性,以及一个好的分配策略的标准;然后从采用的技术角度将资源分配策略分类,并针对不同的技术阐述了其原理,介绍了研究现状,分析了各自的优缺点;最后指出当前研究中存在的一些主要问题,并进一步展望本领域未来的研究方向。 相似文献
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This paper proposes an advanced substation integrated protection communication sys- tem based on the latest development in power system. The integrated protection communication system within a substation comprises a number of major components such as the merging unit, communication network and integrated protection unit. The design and capability evaluation of the communication network based on IEC61850 are focused on. Results show that huge information from 4 merging units can be transmitted real-time via adopting 100 Mbit/s optical fiber in a sub-station, and the proposed communication network is able to achieve required performance. 相似文献
13.
Cognitive radio (CR) is a promising technology deemed to improve the efficiency of spectrum utilization. This paper considers
a spectrum underlay cognitive radio network, in which the cognitive users (CUs) are allowed to use the radio spectrum concurrently
with the primary users (PUs) under the interference temperature constraint. We investigate the system performance by using
the proposed joint channel and power allocation scheme under two transmit strategies to achieve higher data rates and performance
diversity gain respectively. Simulation results show that the proposed scheme provides a significant improvement on the bit
error rate (BER) performance and spectrum efficiency of a cognitive wireless network. 相似文献
14.
In order to improve the transmission accuracy and efficiency of sensing and actuating signals in Internet of Things(IoT) and ensure the system stability,an adaptive resource allocation algorithm is proposed,which dynamically assigns the network bandwidth and priority among components according to their signals’ frequency domain characteristics.A remote sensed and controlled unmanned ground vehicle(UGV) path tracking test-bed was developed and multiple UGV’s tracking error signals were measured in the simulation for performance evaluation.Results show that with the same network bandwidth constraints,the proposed algorithm can reduce the accumulated and maximum errors of UGV path tracking by over 60% compared with the conventional static algorithm. 相似文献
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企业在不同的发展阶段面临着不同的环境和特点,这决定了其经营发展的战略和人力资源需求与配置要求也各不相同。同时,企业在高层认识、战略体系、组织结构中存在诸多问题,企业应根据不同的战略类型制定差异化的人力资源配置方案,以适应企业的经营发展战略。 相似文献
16.
邓慧琼 《福建工程学院学报》2016,(3):255-261
针对电网的连锁跳闸现象,对考虑连锁跳闸的电网安全裕度问题进行研究。首先根据连锁跳闸事件中继电保护的动作行为以及连锁跳闸的一般表现,通过分析论证,分别给出利用支路电气参数表示的安全裕度指标,以及利用系统总负荷表示的安全裕度指标,在此基础上,给出求取安全裕度的算法及一种用于定量分析安全裕度的方法;最后通过IEEE39节点系统和IEEE14节点系统上的算例演示进一步验证该方法的合理性和有效性。 相似文献
17.
从办学条件、教学及经费、学生发展、交流培训与服务4个维度选取了21个高等职业教育资源指标,构建了高等职业教育资源配置绩效评价指标体系。运用AHP-TOPSIS模型测算了我国30个省份2018年高等职业教育资源配置绩效的评价值,并利用SOM聚类分析,确定各省份高职教育资源配置绩效的等级。结果显示:纵向科研经费、对外交流和学生就业三种资源配置绩效最优,信息化教学宽带、年生均财政拨款、师生比和高职院校数量四种资源配置绩效最差;从省份中观层面来看,江苏省的高等职业资源配置绩效最优,广东、山东、浙江和北京次之;从区域宏观层面来看,东部地区高等职业教育资源配置绩效优异,中部地区资源配置绩效较差,西部和东北地区的资源配置绩效最差。 相似文献
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1Introduction The orthogonal frequency division multiplexing(OFDM)system is becoming a chosen modulationtechnique for wireless communications,which canprovide large data rates with sufficient robustness toradio channel i mpairments.Recently,there have beenmany attempts to further i mprove the OFDM systemperformance.Among them,an adaptive OFDMscheme has attracted much attention[1,2],in whichmodulation mode of each subcarrier is adaptivelychanged with the channel quality.However,such i m-pr… 相似文献
19.
文章以优化网络教学平台及其搭建环境为切入点,针对跨校区校园网需求,强调需要制定全校统一的信息标准、建立集中的用户管理和认证入口,通过改善平台系统的管理应用方式和资源开发途径,采用因素提取和应用类比的方法,提出适用于一校多区的网络教学平台功能体系结构和系统管理策略,一定程度上解决了教务信息和教育教学资源异构平台的有效共享。并结合实践案例,分析了我校网络教学平台系统的优化对策及发展特点。 相似文献
20.
1IntroductionWe consider the following multi-di mensional nonlin-ear knapsack problem(MNKP)maxf(x)=∑nj=1fj(xj)s.t.gi(x)=∑nj=1gij(xj)≤bi,i=1,…,m,x∈X={x|lj≤xj≤uj,xjinteger,j=1,…,n},where allfjand allgijare nondecreasing functions ofxjon[lj,uj]forj=1,…,n,i=1,…,m,andljandujare integer lower and upper bounds forxj,re-spectively,j=1,…,n.It has been proved that0-1linear knapsack problemis NP-hard[1].Nonlinear knapsack problems have numerous appli-cations in various fields,for example,ca… 相似文献