有源天线在LTE中应用研究

发布时间：2018-06-15 11:30

本文选题：有源天线LTE系统 + 波束赋型　；参考：《北京邮电大学》2014年硕士论文

【摘要】：近年来移动通信技术发展迅猛,电信运营商之间的网络服务质量竞争越来越激烈,当前基站天线的性能将无法满足未来移动通信网络的需求。有源天线作为新兴集成化天线的代表,一方面可以实现灵活变化的网络覆盖,另一方面可以利用天线设备有源集成的优势,消除射频电缆以及链路质量下降引起的损耗,系统用户峰值传输速率和整个站点的数据传输能力将得到有效地提升。LTE作为新一代的通信系统,具有广阔的发展前景。本文就针对有源天线在LTE中的应用展开研究。第一,提取波束赋型LMS算法作为基础研究点。由于传统的LMS算法步长固定,不能根据误差的变化而改变,其后学者提出了一种变步长LMS算法,可以根据误差来改变步长,实现了步长值的动态变化,但是其在低信噪比条件下误差收敛性能欠佳,因此本文在其基础上进行改进,使用误差函数的相关值作为步长变化因子的DS-LMS算法,实现在低信噪比条件下具有较好的误差收敛性能,同时保证其在高信噪比下的性能。然后使用一种多行多列天线阵列方案,根据改进的DS-LMS算法得到天线阵列增益值表,用于有源天线在LTE中仿真。第二,使用仿真对有源天线在LTE中的应用进行分析。由于维也纳大学仿真平台在天线模型、网络拓扑等模块不具有有源天线系统仿真的适用性,因此根据本文的仿真场景需求进行模块添加和改进。主要工作是使用仿真方法,当用户均匀分布时,对有源天线在LTE系统中的下倾角进行优化选择,对其性能表现进行分析评估,得到系统最优远近下倾角。然后使用单主瓣波束场景作为基准系统与使用最优远近倾角的有源天线系统进行对比分析,并仿真不同用户位置分布条件下二者的性能差异,最后得出有源天线在LTE系统中具有广泛适用性的结论。
[Abstract]:With the rapid development of mobile communication technology in recent years, the network service quality competition between telecom operators is becoming more and more fierce. The performance of the base station antenna will not meet the needs of the future mobile communication network. Active antenna, as the representative of the newly integrated antenna, can be realized with flexible network coverage on the one hand, and on the other hand it can benefit. With the advantage of active integration of antenna devices, the loss caused by radio frequency cable and link quality decline is eliminated. The peak transmission rate of the system users and the data transmission ability of the whole site will be effectively promoted as a new generation of communication system, which has broad prospects for development. This paper is aimed at the application of active antenna in LTE. Research.
First, the beamforming LMS algorithm is used as the basic research point. Since the traditional LMS algorithm is fixed and can not be changed according to the variation of the error, a variable step size LMS algorithm is proposed by the scholar, which can change the step length according to the error and realize the dynamic change of the step size. But the error convergence performance under the low SNR condition is not good. Therefore, this paper improves on the basis of it, uses the correlation value of the error function as the DS-LMS algorithm of the step length change factor, and achieves better error convergence performance under the low SNR condition and ensures its performance under high signal to noise ratio. Then, a multi row multi column antenna array scheme is used, according to the improved DS-LMS algorithm. The antenna array gain value table is obtained for active antenna simulation in LTE.
Second, use simulation to analyze the application of active antenna in LTE. Because of the simulation platform of University of Vienna, the module of antenna, network topology and other modules do not have the applicability of the active antenna system simulation, so the module is added and improved according to the requirements of the simulation scene in this paper. The main work is to use the simulation method, when the user is uniform. In the distribution, the down tilt angle of the active antenna in the LTE system is optimized. The performance of the active antenna is analyzed and evaluated, and the optimal remote and near dip angle is obtained. Then the single main lobe beam scene is used as the reference system to compare the active antenna system using the optimal and near dip angle, and the conditions of different user location distribution are simulated. Finally, the conclusion is drawn that the active antenna has wide applicability in the LTE system. Two.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5;TN820

【参考文献】