LTE-A异构网络干扰分析及抑制技术研究
发布时间：2018-08-16 19:25
【摘要】：摘要：随着现代社会对通信系统容量和质量要求的不断提升,包含多种低功率节点的异构网络因其能够在网络容量提升和热点盲点地区覆盖上的卓越性能,正成为LTE-A通信系统组网的主流趋势。但低功率节点的引入也使得LTE-A异构网络拓扑结构日趋复杂,异构网络干扰问题的复杂性和严重程度超过了以往历代通信系统。因此,如何系统分析LTE-A异构网络环境下的干扰问题并对干扰进行有效抑制成为异构网络研究的重点方向之一。 包括干扰协调在内的多种干扰抑制方法是3GPP R8后干扰研究的主流趋势。干扰对准技术因其能够实现系统的最大自由度而成为干扰研究的新热点。但针对LTE-A异构网络环境的干扰协调和干扰对准技术的研究还较为有限。本文首先简要介绍了LTE-A系统的演进方向和关键技术,之后对LTE-A异构网络存在的不同类型的干扰问题进行了概括分析,详细研究了异构网络上下行主要的跨层小区间干扰场景,对各干扰场景下系统性能的影响进行定性评估,并以一个典型的宏小区用户干扰Pico基站的上行干扰场景作为代表,进行干扰建模和结论分析。在对异构网络干扰进行全面总结的基础上,论文系统地介绍了当前主流的小区间干扰协调技术和新兴的干扰对准技术。之后,通过分析上述两种技术的传统方案存在的局限性,论文以降低跨层的小区间干扰、提升系统整体吞吐量为目的,对功率控制技术和干扰对准技术在异构网络场景下的应用方案分别进行了改进和优化,使功率控制方法能够实现根据基站周围用户分布情况进行自动调控,干扰对准方案的预编码矩阵选取更有利于接收性能的提高。仿真结果表明,优化后的基于位置信息的功率控制方案和增加了有用信道矩阵信息的干扰对准方案能够实现LTE-A异构网络系统性能的进一步提升。
[Abstract]:Absrtact: with the increasing demand for the capacity and quality of communication systems in modern society, heterogeneous networks with multiple low-power nodes have excellent performance due to their ability to increase network capacity and cover hot spot blind spots. It is becoming the mainstream trend of LTE-A communication system networking. However, the introduction of low power nodes also makes the topology of LTE-A heterogeneous network more complex, and the complexity and severity of heterogeneous network interference is higher than that of previous communication systems. Therefore, how to analyze the interference problem in LTE-A heterogeneous network environment and how to suppress the interference effectively becomes one of the important research directions of heterogeneous network. Many interference suppression methods, including interference coordination, are the main trend of 3GPP R 8 post-interference research. Interference alignment technology has become a new research hotspot for its ability to achieve the maximum degree of freedom of the system. However, the research on interference coordination and interference alignment in LTE-A heterogeneous network environment is still limited. In this paper, the evolution direction and key technologies of LTE-A system are introduced briefly, then the different types of interference in LTE-A heterogeneous network are analyzed, and the main cross-layer intercellular interference scenarios in heterogeneous network are studied in detail. The impact of system performance in each jamming scenario is evaluated qualitatively, and a typical uplink interference scene of a macro cell user interfering with Pico base station is taken as the representative. The jamming modeling and conclusion analysis are carried out. On the basis of a comprehensive summary of heterogeneous network interference, this paper systematically introduces the current mainstream inter-cell interference coordination technology and the emerging interference alignment technology. Then, by analyzing the limitations of the traditional schemes, the paper aims at reducing inter-layer inter-cell interference and enhancing the overall throughput of the system. The application schemes of power control technology and interference alignment technology in heterogeneous network scenarios are improved and optimized respectively, so that the power control method can automatically adjust and control according to the distribution of users around the base station. The selection of precoding matrix of interference alignment scheme is more beneficial to the improvement of reception performance. The simulation results show that the optimized power control scheme based on position information and the interference alignment scheme with useful channel matrix information can further improve the performance of LTE-A heterogeneous network systems.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
本文编号：2186945
[Abstract]:Absrtact: with the increasing demand for the capacity and quality of communication systems in modern society, heterogeneous networks with multiple low-power nodes have excellent performance due to their ability to increase network capacity and cover hot spot blind spots. It is becoming the mainstream trend of LTE-A communication system networking. However, the introduction of low power nodes also makes the topology of LTE-A heterogeneous network more complex, and the complexity and severity of heterogeneous network interference is higher than that of previous communication systems. Therefore, how to analyze the interference problem in LTE-A heterogeneous network environment and how to suppress the interference effectively becomes one of the important research directions of heterogeneous network. Many interference suppression methods, including interference coordination, are the main trend of 3GPP R 8 post-interference research. Interference alignment technology has become a new research hotspot for its ability to achieve the maximum degree of freedom of the system. However, the research on interference coordination and interference alignment in LTE-A heterogeneous network environment is still limited. In this paper, the evolution direction and key technologies of LTE-A system are introduced briefly, then the different types of interference in LTE-A heterogeneous network are analyzed, and the main cross-layer intercellular interference scenarios in heterogeneous network are studied in detail. The impact of system performance in each jamming scenario is evaluated qualitatively, and a typical uplink interference scene of a macro cell user interfering with Pico base station is taken as the representative. The jamming modeling and conclusion analysis are carried out. On the basis of a comprehensive summary of heterogeneous network interference, this paper systematically introduces the current mainstream inter-cell interference coordination technology and the emerging interference alignment technology. Then, by analyzing the limitations of the traditional schemes, the paper aims at reducing inter-layer inter-cell interference and enhancing the overall throughput of the system. The application schemes of power control technology and interference alignment technology in heterogeneous network scenarios are improved and optimized respectively, so that the power control method can automatically adjust and control according to the distribution of users around the base station. The selection of precoding matrix of interference alignment scheme is more beneficial to the improvement of reception performance. The simulation results show that the optimized power control scheme based on position information and the interference alignment scheme with useful channel matrix information can further improve the performance of LTE-A heterogeneous network systems.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
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