第三代移动通信的小区规划（上）

对第三代移动通信中的WCDMA系统小区规划时基站数目的确定作了全面的阐述。首先从满足话务量角度出发计算最小基站数目，然后从覆盖角度出发计算出最小基站数目，最后综合两种计算方法的结果。     

谈3G无线网络规划

1、3G无线网络的规划原则 1．13G无线网络规划内容 3G无线网络规划包括在各种情况下计算链路预算、容量和小区基站数目，同时要对基站覆盖进行预测，对其参数进行规划。除此之外，还需要对整个网络进行策划，计算基站中信道单元的数目、传输线路容量、基站控制器、交换机等其他单元的数目。在规划中需引入性能测量，如掉话率和闭塞等指标，用它们来衡量网络性能。     

TD-SCDMA基站和WCDMA基站的共存分析

主要探讨了WCDMA系统与TD—SCDMA系统基站间的共存问题，并从邻频干扰的角度进行了深入的分析；采用确定性计算方法和静态仿真方法研究TD—SCDMA基站对WCDMA基站产生的邻频干扰，并分析了采用智能天线后带来的改善。     

多用户MIMO系统在有限反馈下结合预编码与调度算法的研究

捅要：研究了多用户多输入多输出（MIMO）系统在有限反馈下的一种结合单位预编码与用户调度算法的方案。在该系统中每一用户都具有多个接收天线,该方案具有较大的多用户分集增益和较小的计算复杂度,从而能够减少系统中的用户间干扰。每个用户独立地决定自己的天线合并矢量,并将最优波束矢量以及对应的估计信干噪比通过有限反馈信道反馈给基站,此时基站获取了相应的用户信道信息和用户间干扰信息。基于接收到的反馈信息,基站从预定义的码本中选取和速率最大的最优子集进行系统预编码,然后依照预编码矩阵调度欧氏距离最小的用户且用户个数不超过发送天线的数目。仿真结果显示该方案有效地改善了系统速率,特别是在用户数目较多或者信道环境较好的情况下。     

基站能耗体系模型分析与节能实践

通过对南方某通信运营商基站能耗的现状分析,从能耗体系的角度阐述了各要素对基站能耗的影响及相应的改造措施,通过理论计算和实际测试,得出基站节能减排需关注的重点。     

基于链路预算WCDMA网基站数量计算

链路预算可计算出各环境下最大允许的路径损耗,将这一损耗带入到校正的传播模型中,即可计算出各环境下基站的覆盖半径和覆盖面积.基于这一数值及之前设定环境区的面积,可计算出各环境区下满足覆盖所需基站数目.     

TD-SCDMA和WCDMA系统基站的共容分析

主要探讨了WCDMA系统与TD-SCDMA系统基站间的共存问题,并从邻频干扰的角度进行了深入的分析,采用确定性计算方法和静态仿真方法研究TD—SCDMA基站对WCDMA基站产生的邻频干扰,并提出相应的解决方法。     

一种超密集网络基站分簇管理算法

为了降低超密集网络中基站管理算法的计算复杂度并提升基站的能源使用效率,根据用户密度、网络负载量等信息,提出了一种基于分簇的动态管理基站算法.该算法首先根据用户测量报告计算出理论最小需求基站数,然后对基站进行合理的网络分簇,最终通过粒子群优化算法确定基站休眠组合.仿真结果表明,与未进行分簇的基站管理算法相比,该算法可以降低约60%的计算复杂度,并能有效降低基站能源消耗.     

基于无人机5G高空基站的低成本应急定位方法

当由于台风、塌方和地震等极端灾害导致地面固定基站损毁时，可以利用无人机搭载5G高空基站来为待测用户(User Under Test, UT)提供应急定位服务。要获得目标的三维位置信息，至少需要4个基站。针对如何降低极端条件下待测目标的定位成本，减少对无人机基站数量的要求，提出了一种基于无人机5G高空基站的低成本应急定位方法。利用最小二乘(Least Square, LS)算法来估计UT的初始位置，并将该初始位置作为虚拟移动基站加入初始基站集合。基于新的基站集，利用二次LS算法对UT的位置进行迭代估计，并将得到的一系列待测目标估计值作为虚拟基站集，随后基于高程精度因子(Vertical Dilution of Precision, VDOP)最小从虚拟基站集中选取一个最佳的虚拟移动基站，并以此作为UT的位置更新。将位于三维空间的无人机基站投影到水平面，联合到达时间差(Time Difference of Arrival, TDOA)和方位角测量值，采用一次加权最小二乘(Weighted LS,WLS)算法求解待测目标的水平位置。利用初始解分量之间的相关性，通过二次WLS算法对目标的水平位...     

最小二乘自适应滤波的广义多信道QR格型算法

对于广义多信道的最小二乘自适应滤波，即允许有信道参数数目不相等，本文提出一种QR格型算法。这个算法完全利用Givens旋转来解广义多道最小二乘问题，具有优越的数值性能和高度的模块化结构，适合于VLSI实现。对于通用处理器实现，这个算法需要O（p2）运算复杂度，其中p为信道数，对于基本处理单元实现，需要2p角度计算单元和3p2－p旋转单元。     

A smart technique for determining base-station locations in anurban environment

With the increasing demand for cheaper and better wireless communication services from customers, and the tendency to move toward smaller cell sizes, it is becoming very important to optimally design the cell geometry and deploy the minimum number of base stations to provide maximum possible coverage. We consider how to optimally determine the locations for the placement of base stations for a wireless system in an urban setting, given the cell coverage. An algorithm is presented that determines the optimal locations of the base stations without performing an exhaustive search. Using this algorithm, a 20-25% decrease in the number of base stations required has been observed for simulated environments. The computational complexity of the proposed algorithm is also discussed     

Probability distributions for the number of radio transceivers which can communicate with one another

This paper considers points which can communicate with one another and which are uniformly and randomly distributed on the plane, assuming an inverse power law for attenuation and log-normal shadowing. First, a probability distribution is obtained for the distance between a pair of such points. Communication is assumed to be possible if the attenuation of a signal transmitted from one point, say a mobile phone, does not exceed some specified value by the time it reaches the other, say a base station. The probability distribution of the number of base stations which can hear such a signal from a given mobile is found. An example shows how the probability that a mobile is in a handover region between two or more base stations can be evaluated. The analysis is extended to the case where the power law changes at a specified distance from the mobile, and also to consider the effect of an area within the plane containing a greater density of mobiles and/or base stations (a hot spot). A final result gives the conditional distribution for the number of base stations within some specified area of the plane, given the number within some larger area containing that specified area. The results also apply to the number of mobiles within range of a base station and, in an ad hoc network, to the number of nodes within range of a given node.     

基于多点协作联合传输的超密集组网性能分析

超密集组网的基站高密度特性会带来严重的小区间干扰,多点协作联合传输应用于超密集组网进行干扰管理是目前的研究热点,该文对多点协作联合传输时基站密度对网络性能的影响进行了分析。首先采用随机几何方法推导了3维空间基站与用户距离的概率密度函数,为选取距离用户最近的多个基站联合传输的协作机制提供了基础;然后结合有界双斜率路径损耗模型,进行用户下行链路的干扰建模,进一步推导出用户下行链路覆盖率和网络区域频谱效率的表达式,并分析了协作基站数、基站密度等参数对网络性能的影响。数值仿真表明:协作基站数为2时就可使下行链路覆盖率增加10%,且实现2到3倍的频谱效率的增益,当协作基站数为3时,费效比更优,同时可得到多点协作下的基站密度极限使区域频谱效率最高。该文工作可为下一代移动通信网络的基站部署提供理论支持。     

An Algorithm for the Design of a Cost-Optimized Topology for the Fixed Part of a GSM Network

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Performance approximation of a multi-base station slotted ALOHA forwireless LAN's

It has been reported that the capture effect can improve the performance of slotted ALOHA systems. Further improvement can be expected when the number of base stations is increased. The performance of such slotted ALOHA systems with multiple base stations is analyzed with the aid of the equilibrium point analysis. Not only the capture effect but also the packet dropping due to the finite number of retransmission trials are taken into account. The numerical results indicate that the finite number of retransmission trials mainly contributes to the improvement of the packet dropping probability in the range of the light input traffic, while the number of base stations mainly contributes to the improvement of the overall throughput and the average transmission delay in the range of the heavy input traffic     

A Method for Determining the Number of Base Stations Connected to a BSC in CDMA Cellular Communication Systems

The number of base stations connected to a BSC (Base Station Controller) should be determined by the capacities of CCP (Call Control Processor) and the other resources of the BSC. We can specify the capacity of the BSC in terms of the rates of call connections, soft handoffs, pagings and location registrations. In this paper, we will calculate the occurrence rates of call connections, soft handoffs, pagings and location registrations in the service area of the BSC when the number of base stations connected to the BSC is known. Based on the formulae for the occurrence rates, a method for determining the number of base stations connected to the BSC will be proposed.     

影响基站应急供电的典型问题分析

随着移动通信的迅速发展,移动基站数量剧增,同时由于经济快速发展造成的电力短缺和日益增多的灾害性天气都给基站的正常运行带来严重的影响,应急油机成为基站应急供电的重要保障。文章着重探讨了在使用应急油机的过程中一些比较重要又容易被维护使用人员忽视的问题,并提出了解决办法。     

5G网络中基于覆盖区域优先级的微基站休眠算法

随着5G移动通信技术日渐成熟，移动终端数量快速增长，5G无线通信系统基站密集能耗问题突出，提出一种微基站区域分级休眠算法。考虑微基站负载、站间距离、层间配合对微基站休眠的影响，宏基站与宏基站之间重叠覆盖区域中微基站状态转换次数少，优先休眠操作节能效果好。仿真结果表明，节能率为23%，能适应不同的网络规模，在大规模网络中节能效果更优越。     

拉远站传输接入方案探讨

目前4G网络建设进入高速发展期,随着移动网络建设速度的加快,拉远基站凭借成本低,适应环境的能力强,工程建设方便的优势,在工程建设中得到了越来越多的应用.本文对如何为大量建设的拉远基站提供快速有效的传输接入方式提出了几种解决方案,对于将来的4G拉远基站的大规模建设提供了参考模型.