LTE-A異構網絡干擾分析及抑制技術研究
發(fā)布時間：2018-08-16 19:25
【摘要】：摘要：隨著現(xiàn)代社會對通信系統(tǒng)容量和質量要求的不斷提升,包含多種低功率節(jié)點的異構網絡因其能夠在網絡容量提升和熱點盲點地區(qū)覆蓋上的卓越性能,正成為LTE-A通信系統(tǒng)組網的主流趨勢。但低功率節(jié)點的引入也使得LTE-A異構網絡拓撲結構日趨復雜,異構網絡干擾問題的復雜性和嚴重程度超過了以往歷代通信系統(tǒng)。因此,如何系統(tǒng)分析LTE-A異構網絡環(huán)境下的干擾問題并對干擾進行有效抑制成為異構網絡研究的重點方向之一。 包括干擾協(xié)調在內的多種干擾抑制方法是3GPP R8后干擾研究的主流趨勢。干擾對準技術因其能夠實現(xiàn)系統(tǒng)的最大自由度而成為干擾研究的新熱點。但針對LTE-A異構網絡環(huán)境的干擾協(xié)調和干擾對準技術的研究還較為有限。本文首先簡要介紹了LTE-A系統(tǒng)的演進方向和關鍵技術,之后對LTE-A異構網絡存在的不同類型的干擾問題進行了概括分析,詳細研究了異構網絡上下行主要的跨層小區(qū)間干擾場景,對各干擾場景下系統(tǒng)性能的影響進行定性評估,并以一個典型的宏小區(qū)用戶干擾Pico基站的上行干擾場景作為代表,進行干擾建模和結論分析。在對異構網絡干擾進行全面總結的基礎上,論文系統(tǒng)地介紹了當前主流的小區(qū)間干擾協(xié)調技術和新興的干擾對準技術。之后,通過分析上述兩種技術的傳統(tǒng)方案存在的局限性,論文以降低跨層的小區(qū)間干擾、提升系統(tǒng)整體吞吐量為目的,對功率控制技術和干擾對準技術在異構網絡場景下的應用方案分別進行了改進和優(yōu)化,使功率控制方法能夠實現(xiàn)根據(jù)基站周圍用戶分布情況進行自動調控,干擾對準方案的預編碼矩陣選取更有利于接收性能的提高。仿真結果表明,優(yōu)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陣信息的干擾對準方案能夠實現(xiàn)LTE-A異構網絡系統(tǒng)性能的進一步提升。
[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.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5
本文編號：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.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5
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