合肥市轨道交通线网专用无线通信系统频率规划研究

根据合肥轨道交通建设规划情况,分析合肥市轨道交通专用无线通信系统频率的复用模式,合理规划频率,节约频率资源,提高频率利用率。     

GSM网络高密度环境下的频率规划方法

随着移动通信的发展,GSM网络规模不断扩大,基站密度以及单小区载波配置越来越高,话务密集化程度的提高对频率规划提出了新的要求,一些传统的频率规划方法已经不适用,如何最大限度的提高频谱利用率,提升网络性能,是目前网络优化工作中的一项重要工作.从频率复用模型、干扰矩阵构造、自动规划算法三方面对密集区频率规划方法进行探讨,并以实际案例作为验证.     

GSM网络干扰定位及解决方案研究

随着GSM网络数据业务持续快速发展,频谱资源日益紧缺。为缓解频谱资源紧张,一般会采用更紧密的频率复用方式来提升网络容量。但是对于一定的频谱资源,紧密的频率复用在扩大网络容量的同时也会增强干扰。研究了GSM系统内干扰、干扰的定位及基于频率复用技术的解决方案,并结合江门市区同邻频干扰案例和实际工作经验,分别对干扰产生的原因及解决办法进行了分析和研究,可为网络维护提供参考。     

中兴通讯GSM最新产品及解决方案系列之二中兴通讯推出更紧密频率复用解决方案

频率复用是网络规划和优化中的一个重要问题.在频率规划中,通常采用频率复用因子来衡量频率利用效率或频率复用的宽松程度,对于n×m频率复用方式,频率复用度为:freuse=n×m,但通常实际规划时所分配的频点数会大于n×m,因此实际的freuse往往大于上述值. 如图1所示,频率复用度越小,其频率复用越紧密,频率的利用率越高,但随着频率复用紧密程度的增加,带来网上的干扰增大,需要相关技术的支持,如DTX、功率控制等;频率复用度越大,其频谱利用率率小,但容易获得较高的网络话音质量.     

中兴通讯推出更紧密频率复用解决方案

频率复用是网络规划和优化中的一个重要问题。在频率规划中，通常采用频率复用因子来衡量频率利用效率或频率复用的宽松程度，对于n×m频率复用方式，频率复用度为：freuse=n×m，但通常实际规划时所分配的频点数会大于n×m，因此实际的freuse往往大于上述值。[第一段]     

GSM网络的频率规划

频率规划对于无线网络的运行起着相当重要的作用,本文简要介绍了频率规划的方法和过程,重点对频率复用模式和自动频率分配进行了介绍。由于频率资源紧缺,现在频率规划一般都采用MRP（Multiple Reuse Pattern）、同心圆等紧密复用方式。利用计算机进行自动频率分配可比手工分配频率更为快速、准确。     

GSM网络中的干扰定位及解决方案的研究

随着GSM网络数据业务持续快速发展,频谱资源日益紧缺,为缓解频谱资源紧张,一般会采用更紧密的频率复用方式,但是对于一定的频率资源,频率复用越紧密,网络容量越大,同频复用距离越小,干扰就越大。文章研究了GSM系统内干扰、干扰的定位及基于频率复用技术的解决方案,并结合江门市区干扰案例和实际工作经验,分别对干扰产生的原因及解决办法进行了分析和研究,可为网络维护提供参考。     

移动通信网络中频率规划与优化的研究

随着移动通信网络不断的建设和扩容，频率资源的规划已成为移动通信网络规划的重要环节。如果在网络整体规划时频率规划得不好．则会造成整个网络建成或扩容后某些性能指标不合要求，如相邻小区分配了相同的载频．用户在其中一个小区内通话时就可能会受到相邻小区在同一载频上的干扰．造成接收电平较好．但接收质量却较差的情况，甚至引起掉话。如何更有效地利用有限的频率资源，以最少的频点满足现网的要求，达到最佳的频率配置效果，一直是网络规划人员研究的课题。     

模拟蜂窝移动通信网的簇内非规则频率复用方式

提出了在模拟蜂窝移动通信网络规划中一些非规则频率复用方式,并针对其特点和实际应用所采取的措施进行了分析,介绍了这一方法在广泛模拟蜂窝移动通信网的应用情况。非规则频率复用方式是提高移动通信网频谱利用率的较好途径。     

移动WiMAX的频率复用分析

本文首先简述了网络规划和频率复用问题,然后重点介绍了移动WiMAX在频率复用系数分别为1和3时的对比及分析,得出系统单扇区复用系数为3时的效率要优于复用系数1,但是基站的整体效率则是复用系数为1占优,而这时又会产生较大的干扰,采用部分频率复用则可很好地解决这个问题,最大化了整体频谱效率.     

A design concept for reconfigurable mobile radio networks with slowfrequency-hopping signaling

A design concept to support both the initial planning and the management of land mobile radio networks with slow frequency-hopping signaling is proposed. It is applicable to the networks with advanced architecture of which the Pan European networks may be an example. The design consists of two planning processes: spatial and frequency planning. A novel heuristic is used to optimize the base station locations with respect to the total interference-to-signal ratio in a network. This ensures economic coverage of the network service area as well as efficient frequency reuse. A repeated application of the same heuristic to the currently measured and/or predicted data offers powerful means to manage a network in order to keep its resources highly available to their users, as is shown in a simulation example which includes not only sources of unintentional (cochannel, adjacent channel, and intermodulation) interference but also sources of intentional (jammer) interference     

Improving the capacity in wireless networks through integratedchannel base station and power assignment

The limited availability of radio frequency spectrum will require future wireless systems to use more efficient and sophisticated resource allocation methods to increase network capacity. In this work, we propose a joint resource allocation algorithm (JRAA) that makes the channel base station and power assignment in a wireless network with an arbitrary number of base stations and mobiles attempting to minimize the number of channels needed to provide each user in the system with an acceptable radio connection. We compare the performance of the JRAA for both the forward (downstream) and reverse (upstream) directions, in terms of the achievable traffic capacity, with some bounds on the performance of the maximum packing (MP), clique packing (CP), and reuse partitioning (RP) techniques, which are usually used as benchmarks on the capacity that can be achieved by any traffic-adaptive dynamic channel assignment strategy, where the quality is guaranteed by the reuse distance. Those performance results verify the improvement that can be achieved by the integration of the channel base station and power assignment. Finally, several versions of the two-way channel assignment problem are studied and evaluated     

中继蜂窝网中基于功率控制的频谱分配方案

中继蜂窝网络是近年来移动通信领域的热点,为了解决传统蜂窝网络的缺点,本文提出了在中继蜂窝网中基于功率控制的频谱分配方案,通过中继方式,解决了远近效应的问题,通过频率复用可以显著的提高系统频率资源利用率和系统性能,通过采用基站功率控制技术解决了由于资源复用带来的链路干扰过大问题。     

光载射频拉远技术的应用

光载射频拉远系统是一种新型的分布式网络覆盖模式,它通过基带与射频分离的方式,将基带部分集中处理,采用光纤将基站中的射频模块拉到远端射频单元,分置于需要覆盖的站点上,从而节省了常规解决方案所需要的大量机房。同时,通过采用大容量宏基站支持大量的光纤拉远,可实现容量与覆盖之间的转化。此外,射频拉远系统可以还可以支持高速铁路,超远距离覆盖等场景,是3G网络中应用最为广泛的一种技术。     

A simple generalization of the CDMA reverse link pole capacityformula

A formula that computes the maximum number of users supported per base station in a cellular radio network is generalized to consider the frequency reuse number and arbitrary processing gains. The generalization quantifies a cost associated with in-cell interference by accounting for the lack of interference from the desired user on the total interference and by considering the impact of the frequency reuse number on the out-of-cell interference. This interference cost results in an increase in the received Eb/Io relative to FDMA which should be weighted against a reduction in the Eb/Io requirement resulting from using CDMA     

Local Base Station Cooperation Via Finite-Capacity Links for the Uplink of Linear Cellular Networks

Cooperative decoding at the base stations (or access points) of an infrastructure wireless network is currently well recognized as a promising approach for intercell interference mitigation, thus enabling high frequency reuse. Deployment of cooperative multicell decoding depends critically on the tolopology and quality of the available backhaul links connecting the base stations. This work studies a scenario where base stations are connected only if in adjacent cells, and via finite-capacity links. Relying on a linear Wyner-type cellular model with no fading, achievable rates are derived for the two scenarios where base stations are endowed only with the codebooks of local (in-cell) mobile stations, or also with the codebooks used in adjacent cells. Moreover, both uni- and bidirectional backhaul links are considered. The analysis sheds light on the impact of codebook information, decoding delay, and network planning (frequency reuse) on the performance of multicell decoding as enabled by local and finite-capacity backhaul links. Analysis in the high-signal-to-noise ratio (SNR) regime and numerical results validate the main conclusions.      

A low-cost cellular mobile communication system: a hierarchicaloptimization network resource planning approach

This paper deals with the optimization of the design and radio network resource planning for cellular mobile communication systems. The key element to be considered for mobile network planning is cost. A hierarchical optimization planning method (HOP) is utilized since there are so many factors like system performance, terrain features, base station parameters, and cost factors which are involved in the large-scale system design. We present a three-level optimization approach for designing a cellular mobile system. It determines the cell number, cell site allocation, and the specific base station parameters in order to minimize the total system cost and to comply with the required system performance. The problem is formulated as a large combinatorial optimization model which can determine the optimal number of cells and select the best base stations' locations. The simulated annealing approach is developed to solve the hard combinatorial problem. Simulation results demonstrate the feasibility and effectiveness of the HOP approach for radio network planning     

GSM900/1800双频网规划及其与3G网络的互操作

就双频网规划中的若干关键问题，如组网方式、无线网络覆盖规划、频率复用方式选择、话务流向控制等进行了探讨。     

多媒体光纤无线宽带系统及其相关技术

采用无线链路与光纤路中频传输方式的多媒体通信网络一直是业内人士关注的焦点，它不仅可以简化基站功能，而且可以与现存的网络接线端和混合网终端连接，具有可塑性强。详细讨论和分析了多媒体光纤无线宽带系统的结构、原理及相关的技术问题。     

移动WiMAX的组网方式研究及性能仿真

本文从目前常见的移动网组网方式和频率复用方式出发,重点分析了在不同频率复用方式下网络性能的优劣,并通过系统仿真,量化地比较不同组网方式下网络覆盖和小区吞吐量的差异,从而为移动WiMAX的规划建设提出具有指导意义的建议.