软分数频率复用

针对4G移动通信系统提出的提高频谱利用率、同频组网的需求,文章从频率复用问题入手,提出了一种软分数频率复用方案。软分数频率复用方案包括3种表现形式,在实际应用中,可以根据物理层链路增益选择适当的表现形式。文章以第2种表现形式为例介绍了采用该方案的频率复用方法。研究表明,使用软分数频率复用方案,系统的频率复用系数可以达到1/3～1。软分数频率复用方案解决了同频组网问题,并已经在上海4G实验网中得到了良好的应用。     

移动WiMAX的频率复用分析

简述了网络规划和频率复用问题，然后详述了移动WiMAX在频率复用度分别为1和3时的对比分析，最后介绍了部分频率复用。     

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]     

LTE系统频率复用方式的探讨

为了提高LTE系统容量而必须要采取有效的频率复用技术,所以LTE系统中干扰协调的手段之一就是频率复用技术,本文对多种频率复用方式进行了讨论,并进行了总结。     

LTE中频率复用改进算法研究

下一代蜂窝系统中通过频谱复用来克服小区间干扰已成为当前研究热点.针对LTE小区间干扰协调问题,重点讨论比较了几种频率复用方案,并提出一种自适应的部分频率复用优化方案和具体实现算法,仿真表明该算法能显著改善小区边缘用户的吞吐量性能和公平性参数.     

B3G/4G中的软频率复用方案及算法研究

文章首先简要介绍了传统的复用方案和具有代表性的几种小区间干扰协调方案,然后主要介绍了软频率复用方案的原理和性能,最后提出了子载波资源单向分配、子载波资源随机分配和子载波资源双向分配等软频率复用方案及具体实现算法。通过仿真得出结论,子载波资源双向分配方案在业务量不高情况下,具有显著优势,并且实现复杂度低。     

基于复用的.NET组件模型的研究

目前,软件复用的重点在于设计和运用有较高封装性的组件.首先介绍支持软件复用的、支持设计和实现统一的、多种类型的.NET组件模型的定义;接着介绍各种类型组件的实现方式,包括类设计器和控件工具箱等;分析了采用多种组件模型的意义.     

Multi-beam cooperative frequency reuse for coordinated multi-point transmission

Coordinated multi-point (CoMP) joint transmission is considered in the 3rd generation partnership project (3GPP) long term evolution (LTE)-advanced as a key technique to mitigate inter-cell interference and improve the cell-edge performance. To effectively apply CoMP joint transmission, efficient frequency reuse schemes need to be designed to support resource management cooperation among coordinated cells. However, most of the existing frequency reuse schemes are not suitable for CoMP systems due to not considering multi-point joint transmission scenarios in their frequency reuse rules. In addition, the restrictions of frequency resources in those schemes result in a high blocking probability. To solve the above two problems, a multi-beam cooperative frequency reuse (MBCFR) scheme is proposed in this paper, which reuses all the available frequency resources in each sector and supports multi-beam joint transmission for cell-edge users. Besides, the blocking probability is proved to be efficiently reduced. Moreover, a frequency-segment-sequence based MBCFR scheme is introduced to further reduce the inter-cell interference. System level simulations demonstrate that the proposed scheme results in higher cell-edge average throughput and cell-average throughput with lower blocking probability.     

Joint relay station deployment and frequency reuse scheme for two-hop cellular networks

To fully exploit the performance benefits of relay station (RS),in the two-hop cellular networks covering hotspots,when the number of RSs is predetermined,both RS deployment and frequency reuse scheme ...     

Load-adaptive frequency reuse scheme for inter-cell interference coordination in relay networks

Cellular relay networks adopting orthogonal frequency division multiple(OFDM)technology has been widely accepted for next generation wireless communication due to its advantage in enlarging coverage scale as well as improving data rate.In order to improve the performance of user equipments(UEs)near the cell edge,especially to avoid the interference from inter-cell and intra cell,an enhanced soft frequency reuse scheme is adopted in this paper to assure inter-cell interference coordination(ICIC).Compared with traditional frequency allocation work,the proposed scheme is interference-aware and load-adaptive,which dynamically assigns available frequency among UES under certain schedule method in variable traffic load condition and mitigates interference using information provided by interference indicator.It can improve signal-to-interference plus noise ratio(SINR)of the UE in each sub channel thus enable the system achieve better throughput and blocking probability performance.Simulation results prove that the proposed scheme may achieve desirable performance on throughput,blocking probability and spectral utilization in the sector under different traffic load compared with other schemes.     

原油析蜡点计算软件的设计与实现

依据中国石油行业SY/T 0522-2008标准中对于旋转粘度计法计算原油析蜡点的方法,经过大量的摸索和实践,利用Swing框架,通过模拟回归曲线并从中选取最优化回归曲线,实现了原油析蜡点的计算并绘制了反应其计算过程的散点图,以此为核心完成了本软件的研制。     

多小区OFDMA系统中分数频率复用方法的优化分析

在以OFDMA为基本多址方式的第四代移动通信系统中,频率复用作为提高系统性能的有效方法受到了广泛的关注,特别是分数频率复用和软频率复用。然而,如何进一步优化基于这些频率复用方法的OFDMA系统还有待研究。本文分析了多小区OFDMA系统负载和频率集合分配比例对小区总吞吐量和小区边缘用户数据速率的影响。同时,给出了在保证小区边缘用户服务质量的条件下,使小区总吞吐量最优的小区中心频率分配比例,并用仿真进行验证。仿真结果还表明了,随着分配比例的增大,小区总吞吐量先增大后减小。     

TD—LTE系统频率复用仿真分析

主要根据小区间干扰协调的原理,分别从上行和下行的角度探讨ICIC的三种实现方式和各自的应用效果,分析LTE系统所采用的技术和OFDM的技术特点,说明了频率复用对于LTE系统的重要性。从干扰协调的角度对干扰与容量损失的关系、干扰余量的取定等做了定量的分析和计算,并给出了干扰协调设计要点的总结。给出了针对于不同频率复用系数下SINR的计算方法。实验表明,该分析具有一定的现实意义。     

部分频率复用技术性能分析及研究

文章对部分频率复用技术的复用因子选择准则做了详细论证;结合仿真给出两种部分频率复用方案在实际网络运营时的资源参数选择准则,以实现小区中心和小区边缘更平衡的比特速率;最后对两种部分频率复用方案进行了比较,供网络运营商实际布网做参考.     

TD-LTE系统改进型软频率复用技术的研究

提出了一种频谱资源的分配方法。该方法基于经典软频率复用技术,但改善了经典软频率复用频谱分配的缺点。仿真结果表明,与经典软频率复用相比,由于在频谱分配上增加了一段可抢占式频谱资源,大大提高了频谱分配的灵活性,对系统整体性能影响不大的情况下,有效提升了小区边缘用户的性能。