频谱管理研究的重要性浅谈

无线电业务发展越来越广泛．电磁环境越来越复杂．频谱资源越来越稀缺．这与现在的频谱管理制度以及频谱分配方式有很大的关系。频谱管理研究着重于对频谱资源的基础性研究．为频谱规划前期提供技术支持。本文简要介绍了频谱管理研究的作用和研究内容,让读者对频谱管理研究有一定的了解。     

感知无线电中的频谱检测技术

感知无线电可以自动感知外界的无线环境并能调整系统参数以适应环境的变化。频谱检测是感知无线电的关键技术之一，要求感知用户可靠、快速地检测频谱空洞。文中按照主用户发射端检测和主用户接收端检测，对当前的主要频谱检测算法进行了分类，并对频谱检测算法进行了讨论和对比研究，给出了在IEEE802．22和频谱池结构中的频谱检测的具体应用。     

未来海战场电磁频谱管理

在分析海战场电磁频谱管理重要性的基础上,结合对外军战场电磁频谱的分析,研究了海战场电磁频谱管理及其系统集成的基本原则、内容和手段．对如何提升我军未来海战场电磁频谱管理能力进行了探讨。     

认知无线电与未来动态电磁频谱管理设想

当前静态的电磁频谱管理模式已经无法适应无线通信技术的飞速发展．频谱管理模式亟待变革。认知无线电技术可以感知周围无线频谱环境．并且通过实时改变操作参数以更好地利用有限的频谱资源。这种思想给未来的频谱管理带来了希望．基于认知无线电技术的频谱管理模式已成为频谱管理部门的研究热点。本文基于认知无线电技术对未来的频谱管理模式提出了一些设想．供相关部门和研究人员参考。     

多维频谱空间下的动态频谱管理研究

根据频谱管理现状,阐述了多维频谱空间的内涵及研究意义,提出了以多维频谱空间作为动态频谱管理工具的思想,分析了可实现该思想的技术手段,即自适应的频谱利用新技术,并从频谱管理法规和频率指配程序两方面给出了相应的实施建议.     

美国频谱高速公路计划浅析——转变频谱结构,加强频谱管理,实现频谱共享

随着无线技术发展,无线频谱的接入需求激增与现有无线系统的频谱利用率低下形成矛盾。为了解决该矛盾,提升经济竞争力,美国政府提出了1000MHz的宽带频谱共享计划(即频谱高速公路计划)。针对该计划,本文介绍了其新的频谱结构、频谱使用的度量方法、等级接入方式和接入系统以及基于接收机管理等方面内容。最后给出了总结,并阐述了该计划对我国无线电频谱管理的启示。     

基于动态频谱接入的频谱管理方法

频谱管理的目的是控制干扰和提高频谱利用率,从而实现频谱使用价值的最大化。随着新的无线电技术和业务对频谱需求的增加,当前的静态频谱管理方法导致频谱拥塞的问题。动态频谱接入能很好地提高频谱利用率,但可能会给通信系统造成一定的干扰。针对这个问题,本文提出了在动态频谱接入的频谱管理中采用基于服务质量的干扰门限设置和基于频谱占用度统计的频谱感知接入,从而在降低干扰的同时提高频谱利用率。     

动态频谱共享简述

无线电频谱是新一代信息技术的重要载体,频谱共享是解决传统使用方式带来的资源供需矛盾和资源利用率低等重要问题的有效手段,为了对动态频谱共享进行介绍,首先通过解析频谱共享概念,分类阐述频谱共享方式,加深了对频谱共享内涵的理解,之后具体介绍了动态频谱共享技术的发展和两种主流实现技术,最后讨论了推行频谱共享的必要性。     

频谱可支持性分析概述

介绍了频谱可支持性的内涵．详细阐述了美国陆军频谱可支持性的分析程序,突出强调了频谱可支持性风险评估的流程及内容,以期为解决我国频谱可支持性问题提供参考。     

从提高频谱利用率的角度看TD-SCDMA频谱划分

如何合理地为TD-SCDMA运营商划分频段对TD-SCDMA产业的发展有着非常大的影响,高频谱利用率对运营商来说就意味着高收益.从频谱系统利用率的角度分析了不同的频谱划分方案所带来的不同影响,并结合系统仿真结果,提出了合理的频谱划分建议.     

Information utilization and personality

The amount-of-information variable, central to the process of communication and decision making, was subjected to experimental study. Results confirm the common belief that people fail to utilize most of the information to which they have access, and suggest that certain kinds of people—as measured by their personality profiles-are exceptionally efficient in the use of available informaton. For communicators, this suggests the advisability of either reducing persuasive appeals to highly succinct forms or rendering messages with sufficient ambiguity to arouse receivers'curiosity, hence their likelihood of ingesting additional, ambiguity-reducing information.     

8255A的开发利用

为了满足各行各业对计算机通信和控制技术的要求，提高计算机通信的档次和灵活性，本论文应用逻辑代数和人类严密的交互方式总结出了PC机基于用8255A芯片的多种具体可行的通信和控制的方式，最后还结合一个具体通信实例阐述了编码控制方式。本论文总结出的通信和控制的方式具有稳定可靠及节省信号线的特点。     

Maritime satellite requirements and utilization

The basic purpose of this paper is to identify the potential requirements for maritime satellite communication and position fixing as it relates to both present and future operational systems (e.g., MARISAT, INMARSAT, etc.). Particular emphasis is given to the need for position fixing and ship terminal equipment utilization in national waters, as well as other major aspects. Present MARISAT operation and industry evaluation activities are briefly discussed, highlighting a few major programs and some of the potential benefit area thus far generally identified by the users of MARISAT. A comparison is made between satellite communication and the existing MF/HF system, including direct-printing radio telegraph (marine radio telex). From various standpoints, it appears that maritime satellite systems are more desirable than conventional (nontelex) marine telegraph/telephone. In addition, the improved performance, capability, and potential of satellites could outweigh the slightly lower annual traffic and equipment cost for HF marine telex.     

Spectrum conservation by efficient channel utilization

The growth of the communication industry has resulted in ever-increasing demands on the radio spectrum. This, in turn, has spurred the exploitation of previously unused frequency bands and the development of techniques for making better use of those already available. In this paper, spectral utilization is examined using the information-theory techniques of Shannon. The power-bandwidth tradeoff for the ideal channel is established and the performance of practical analog and digital modulation techniques is compared with this ideal. It is shown that well-designed systems tend to operate near the "knee" of the power-bandwidth tradeoff curve for the ideal channel and that they are frequently within 10 dB or less of the performance of the ideal.     

FULL-RCMA: a high utilization EPON

This paper proposes an alternate solution for Ethernet passive optical networks. Our solution uses a novel protocol named full utilization local loop request contention multiple-access protocol to efficiently provide communications in passive optical networks. We study the physical layer implementation, as well as medium access control (MAC) layer protocol performance to illustrate the feasibility and benefit of our solution. The performance studies show that the MAC protocol is capable of offering 95% channel utilization under heavy load conditions. The performance results also indicate that delivery of multimedia traffic with a high quality-of-service can be achieved with our solution.     

DSP utilization in digital color printing

This article discusses the utilization of DSP techniques to digital printing systems, particularly in transforming multidimensional signals from electronic to hardcopy formats by utilizing digital printing solutions and controlling the "marking" engine that is at the heart of the electrophotographic system. Researchers and DSP practitioners are urged to share their vision on the novel use of signal processing algorithms to analyze, manipulate, and solve problems related to high-end digital printing.     

舰载对空传感器的综合使用

舰空导弹负责对来袭的低空反舰导弹进行拦截.舰载对空传感器(搜索雷达、红外警戒设备、跟踪雷达、光电跟踪仪和电子侦察设备)对目标进行探测,为舰空导弹提供目标指示信息.为提高捕获目指精度进而提高对来袭导弹的稳定跟踪能力,将传感器融合理论和效能评估方法引入复杂环境中的舰载传感器综合使用,构建了一个传感器综合使用仿真系统,完成对...     

TG分流提升TD-SCDMA网络利用率

三大TG分流措施提升TD-SCDMA网络利用率：适当提升PCCPCH功率改善TD覆盖。23G互操作参数精细优化,使用户尽量驻留在TD。采用新技术,保证客户感知,引入基于IMEI的分组切换算法和基于上行链路质量的切换算法两项新技术。     

Optimal adaptive spectrum utilization in cellular communicationssystems

Efficient spectrum utilization in third-generation cellular systems has motivated the study of the traffic adaptive channel allocation problem: given the set of channels, the cell structure and the load to be accommodated in each cell find the optimal allocation of channels to cells, subject to the reuse distance constraints. In this paper, we extend this scheme in order to include time fluctuating traffic loads. The extended problem is formulated and solved by reduction to 0-1 (linear and quadratic) programming     

应用于PSTN的IP中继传输及利用度分析

本文分析了在PSTN中引入IP中继传输的基本需求,给出了承载信道IP中继传输的协议设计,并针对IP中继传输的效益性能做了简要的计算分析。结果表明,在典型话务量负载下,通过IP中继传输,带宽利用率能降至约13%。