LTE小区间干扰的分析与研究

发布时间：2018-05-16 07:35

本文选题：LTE + 小区间干扰　；参考：《内蒙古大学》2017年硕士论文

【摘要】：OFDM技术的引入使得LTE系统中,采用SC-FDMA技术的上行链路与采用OFDMA技术的下行链路都能保证小区内用户之间的正交性[1],很好的解决了小区内干扰的问题。但是宽带移动通信对频谱效率的要求使得LTE系统不适合再采用传统蜂窝网络中的小区间频率复用技术来解决小区间干扰的问题[2]。但同频组网方式又会使得小区间的同频干扰非常严重。因此小区间干扰问题是LTE系统中的重中之重。小区所承载的业务与小区间干扰的产生息息相关,不同地区的小区所承载的业务会有不同的特点。因此了解业务的种类、参数以及密度与干扰之间的关系,对控制小区间的干扰,以及网络的规划与设计都有重要的意义。本文主要对LTE系统中的小区间干扰问题进行了逐步深入的研究,从理论角度进行分析,同时利用OPNET系统级仿真平台进行系统级的仿真,并且对仿真结果进行了详细的分析与描述。首先对其干扰的成因与分类进行了讨论与分析。并通过OPNET平台搭建场景进行仿真,通过仿真数据来体现和分析干扰的影响,同时确定仿真过程中需要收集的统计数据。然后对业务承载与干扰的关系分别从业务的种类、业务的参数、业务的密度,这三个角度进行论述和仿真验证。最后对小区间干扰抑制问题进行研究,介绍和比较了几种典型的小区间干扰抑制技术,并对其中ICIC技术进行了明确的分类。并通过OPNET平台搭建了软频率复用的系统级仿真场景,来表现软频率复用带来的性能提升。
[Abstract]:The introduction of OFDM technology makes the uplink using SC-FDMA technology and downlink using OFDMA technology can ensure the orthogonality between users in the LTE system, which solves the problem of intra-cell interference. But the requirement of spectrum efficiency in wideband mobile communication makes LTE system unsuitable to use traditional cellular frequency multiplexing technology to solve the problem of inter-cell interference [2]. But the same frequency network will make the interference of the same frequency of the cell very serious. Therefore, inter-cell interference is the most important problem in LTE systems. The business carried by the cell is closely related to the generation of inter-cell interference, and the service carried by the cell in different regions will have different characteristics. Therefore, it is of great significance to understand the types of traffic, parameters and the relationship between density and interference, to control the interference of the cell, and to plan and design the network. In this paper, the problem of inter-cell interference in LTE system is studied step by step, and it is analyzed from the theory point of view. At the same time, the simulation platform of OPNET system is used to simulate the system level. The simulation results are analyzed and described in detail. Firstly, the causes and classification of the interference are discussed and analyzed. The scene is simulated by OPNET platform, and the influence of interference is reflected and analyzed by simulation data, and the statistical data that need to be collected in the process of simulation are determined at the same time. Then, the relationship between service load and interference is discussed and simulated from three aspects: service type, service parameters, service density, and so on. Finally, the problem of intercellular interference suppression is studied, several typical intercellular interference suppression techniques are introduced and compared, and the ICIC technology is clearly classified. The system level simulation scene of soft frequency reuse is built through OPNET platform to improve the performance of soft frequency reuse.
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5

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