一种TD-LTE室内分布系统设计模型

引入室内分布与室分外引互为补充的室内分布系统设计模型,在实际工程中采用室内分布与室分外引的设计模型实现对楼宇小区的覆盖,通过现场模测证明了室内分布与室分外引相结合的室内覆盖方式的有效性,为物业敏感、室分入户困难等类似场景的室分覆盖提供整体解决方案。     

MEO卫星通信系统的小区驻留时间分布

在MEO卫星移动通信系统中,确定小区驻留时间分布对于合理地规划切换策略具有十分重要的意义。指出了地球固定覆盖与卫星固定覆盖两种方式下小区驻留时间分布的不同原因。提出了计算和仿真卫星固定覆盖方式下小区驻留时间分布的方法,得出了数值结果,并与地球固定覆盖方式下的小区驻留时间分布进行了比较。     

基于非告警类的LTE室分小区MR弱覆盖问题定位方法的研究

针对目前影响室内用户感知的信号弱、速率低等一系列问题,本文从MR数据、室内分布系统设计、无源器件、小区参数等多个角度出发,进行室内分布系统问题的定位与优化方法的探讨,以解决弱覆盖问题导致的一系列影响用户感知的投诉,从而作为研究方法提供给室内分布系统建设、整改及维护相关指导意见.     

多运营商光分布系统高层住宅小区深度覆盖对策

多运营商竞争的格局进一步提升了各运营商的服务质量,使消费者获得更多的实惠,但随着城市化发展的加剧,大型的高层住宅小区的数量不断攀升,对各运营商无线信号的覆盖带来了诸多困难和影响,容易导致信号接收的不稳定,从而影响通信质量.在这种背景下,科学进行多运营商光分布系统高层住宅小区深度覆盖研究,对高层小区住宅进行光分布系统科学设计,从而实现对高层住宅小区深度覆盖,提升各运营商的通信服务质量.     

高清电视转播车定制趋势的研讨(下)

(接上期第57页)5.通话系统设计图8是典型大型转播车内部通话系统设计,通话系统一般采用数字通话矩阵方式。系统设计采用了Telex Cronus DSP数字通话矩阵,矩阵规模为32×32,2U机箱冗余电源,支持点对点(P-P)、多点对多点(PL)、一点对多点(SL)、     

移动已覆盖小区共享改造解决方案

文章通过对小区改造应遵循的原则及小区分布系统多网合路方式进行分析,提出了针对移动已覆盖小区共享改造的解决方案,有利于共建共享的推进。     

基于TD-LTE的室内分布系统设计研究

本文首先介绍了分布系统、需求分析、系统建设相关物理元器件,并以实际小区的室内分布系统设计为例,介绍了其TD-LTE室内分布系统的设计及采用的各种物理元器件,选择分布式基站系统作为信源,即直放站、BBU(室内基带处理单元)、RRU(射频拉远单元)相连组成的信源。最后,在建设完成后,对整个系统的实际工作进行了简单的测试。     

高层小区覆盖结合优化方式探析

文章从小区覆盖结合优化方式原理、链路预算、新技术手段等方面与传统室内分布系统建设对比,阐述了如何用低成本解决小区及高层住宅的深度信号覆盖.     

零星驻地网小区DP点设计优化思路探讨

目前,运营商由前期以密集型商品房小区和大型住宅小区为主的大规模驻地网建设,逐渐转向一些用户总量较小的零星小区。文章从小区驻地网参考模型入手,简述零星驻地网小区设计的传统思路,提出存在的问题。通过建立不同配线需求下的零星小区接入模型,比较靠近馈线侧、靠近用户中心两种DP(光分配点)设置方式的建设工程量及造价,提出DP点最优设置方案。     

移动通信无线室内分布系统的应用与优化措施探讨

不断增加的城市人口、愈发复杂的电磁环境,再加上逐年增加的大型建筑,这些都对网络实现全面覆盖造成了一定的困难。文章就无线室内分布系统在大型场馆建设、密集小区建设、综合性医院建设中的应用进行优化分析,以期对相关技术研究人员有所借鉴作用。     

Customer Access System Design

The key to the successful emergence of the information society [1] is an access system that permits new and diverse communication services to flourish. A fundamental component of such a network is a digital end-to-end communication capability. This paper presents an approach to the design of a digital access system for application in both residential and business environments. Switch, customer premises, and distribution design concepts are presented, and the results of field and laboratory tests of a multichannel digital distribution system are described.     

Design and evaluation of an Ethernet-based residential network

When the information superhighway arrives at the neighborhood, a residential network will connect home appliances to the community access network. These appliances include personal computers, printers, and video clients. Among all local-area network (LAN) protocols, Ethernet is the most economic and the most popular. The unique characteristics of residential networks call for new performance studies. A residential network typically has few nodes and runs different applications than business and academic LANs. Consequently, residential networks have traffic characteristics different from the subject of existing studies. We constructed a residential network testbed to collect typical application traffic statistics. Additional live traffic characterization was obtained from campus networks. Also, we investigated the suitability of Ethernet for video distribution through simulation. This paper discusses the design issues for residential networks and presents a network design that is based on Ethernet technology. Traffic models are established from the actual traffic traces and used for the performance evaluation of residential networks. Furthermore, several future data traffic scenarios are considered with bandwidth up to 6 Mb/s by scaling up current data traffic. The simulation results of the performance suggest that Ethernet can be used as a cost-effective residential network for video and data communications     

Optical fiber cables for residential and business premises

This paper describes a new drop cable, a new cluster-type drop cable for residential premises, a new indoor cable, a new termination cable and a new riser cable for fiber distribution in residential and business premises. The structural design of these cables is investigated and the optimum structures for cost reduction of cable and installation are obtained. Based on the results, these cables are manufactured and their transmission and mechanical characteristics are confirmed to be stable     

有线电视管网设计与施工

结合住宅小区、农村新型别墅小区和现代化工业园区有线电视管道的设计与施工的实践,提出有线电视管网设计与施工的一些做法,并指出了需要注意的事项。     

Cable-Based Metro Area Networks

This paper examines the system design considerations of metropolitan area networks utilizing cable television networks for the delivery of a variety of services to residential customers. Specifically, this paper focuses on the technology, marketplace, and regulatory aspects of this new and expanding market.     

高层小区室分设计分析与应用

随着城市化的进展,各类大型建筑群拔地而起,对于移动通信来讲,随之带来的是给这些高层场景下的用户提供高品质的通话服务。通过哪种设计方式来满足此类需求,保证区域内信号的全方位覆盖,避免边缘地带信号杂乱、信号弱等问题。本文主要从高层小区的设计思路进行分析,以达到解决高层建筑中常见的疑难问题点。     

PCB树脂塞孔工艺技术浅析

随着装配元器件微小型化的发展,PCB的布线面积,图案设计面积也在随之不断的减小。为了适应这一发展趋势,PCB设计和制造者们也在不断的更新设计理念和工艺的制作方法。树脂塞孔的工艺也是人们在缩小PCB设计尺寸,配合装配元器件而发明的一种技术方法。其大胆的设计构思和可规模化的生产确实在PCB的制作领域发挥了极大的推动力,有效的提高了HDI、厚铜、背板等产品的可靠性和制作工艺能力。了解和有效利用这一技术,也是许多PCB业者正在努力进行中的工作。文章概述了树脂塞孔的出现,发展和制作的技术方法,谨供大家参考。     

大范围海域多站纯方位定位精度分布特性估计

针对大范围海域被动定位精度分布特性认识不足、制约测量系统优化设计的问题,提出一种基于多站纯方位定位体制的全区域精度特性估计方法,将定位求解、精度分析与布站优化集成考虑,采用非线性最小二乘法建立定位模型,应用Monte-Carlo方法建立随机误差传播算法,通过大样本、网格化仿真模拟得到全区域定位均方根误差(RMSE)分布。通过仿真验证,模型具有快速收敛特性,能够对测量元素变化产生合理响应,对于在30km×20km测量海区内采用5阵元星形布站、单站测向误差为2°~5°的场景,全区域RMSE中值达到1km精度水平。应用该方法能给出到全区域精度差异的细节特征,进而支持不同布站几何条件下的定位性能比对。仿真算例表明,在5阵元限定下,采用五边形布站能够获取比星形布站、矩形布站、梯形布站更优的精度分布,使区域内RMSE中值降低0.1km,同时高精度覆盖区明显扩大。该方法可为测量系统论证中的精度分析及布站优化设计提供技术途径。      

Birth of the `new city': an exciting creation

Through the careful integration of commerce and industry within the urban residential area, the ideal new city?designed to accommodate a population of up to 200 000 people?should have adequate provision for low-income, middle-income, and luxury housing. Cultural facilities would be concentrated in community centers, and the thoughtful distribution of specialty shops and commercial offices would prevent an oversaturation of similar commodities and services. Scientifically planned public utilities services (water, electricity, and gas) will allow for future industrial expansion and growth. Planned traffic control and adequate parking facilities for today and tomorrow will be a salient feature. The design of such a city would differ radically from the conventional ``blockbuster' techniques for urban renewal, in which an area is leveled by bulldozers, and slums are almost entirely replaced by luxury apartments.     

信息科技时代人口老龄化与居住区规划设计

当前,我国人口老龄化趋势越来越严重,不仅是我国经济社会发展必须关注的问题,更是居住区规划设计必须考虑到的因素。本文首先介绍了老龄化的概述及其对居住区规划设计的影响,然后分析了老年人对居住区的需求特征,最后详细探讨了居住区规划设计中应对人口老龄化的措施。