【摘要】：摘要：隨著現(xiàn)代社會(huì)對(duì)通信系統(tǒng)容量和質(zhì)量要求的不斷提升,包含多種低功率節(jié)點(diǎn)的異構(gòu)網(wǎng)絡(luò)因其能夠在網(wǎng)絡(luò)容量提升和熱點(diǎn)盲點(diǎn)地區(qū)覆蓋上的卓越性能,正成為L(zhǎng)TE-A通信系統(tǒng)組網(wǎng)的主流趨勢(shì)。但低功率節(jié)點(diǎn)的引入也使得LTE-A異構(gòu)網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)日趨復(fù)雜,異構(gòu)網(wǎng)絡(luò)干擾問(wèn)題的復(fù)雜性和嚴(yán)重程度超過(guò)了以往歷代通信系統(tǒng)。因此,如何系統(tǒng)分析LTE-A異構(gòu)網(wǎng)絡(luò)環(huán)境下的干擾問(wèn)題并對(duì)干擾進(jìn)行有效抑制成為異構(gòu)網(wǎng)絡(luò)研究的重點(diǎn)方向之一。 包括干擾協(xié)調(diào)在內(nèi)的多種干擾抑制方法是3GPP R8后干擾研究的主流趨勢(shì)。干擾對(duì)準(zhǔn)技術(shù)因其能夠?qū)崿F(xiàn)系統(tǒng)的最大自由度而成為干擾研究的新熱點(diǎn)。但針對(duì)LTE-A異構(gòu)網(wǎng)絡(luò)環(huán)境的干擾協(xié)調(diào)和干擾對(duì)準(zhǔn)技術(shù)的研究還較為有限。本文首先簡(jiǎn)要介紹了LTE-A系統(tǒng)的演進(jìn)方向和關(guān)鍵技術(shù),之后對(duì)LTE-A異構(gòu)網(wǎng)絡(luò)存在的不同類型的干擾問(wèn)題進(jìn)行了概括分析,詳細(xì)研究了異構(gòu)網(wǎng)絡(luò)上下行主要的跨層小區(qū)間干擾場(chǎng)景,對(duì)各干擾場(chǎng)景下系統(tǒng)性能的影響進(jìn)行定性評(píng)估,并以一個(gè)典型的宏小區(qū)用戶干擾Pico基站的上行干擾場(chǎng)景作為代表,進(jìn)行干擾建模和結(jié)論分析。在對(duì)異構(gòu)網(wǎng)絡(luò)干擾進(jìn)行全面總結(jié)的基礎(chǔ)上,論文系統(tǒng)地介紹了當(dāng)前主流的小區(qū)間干擾協(xié)調(diào)技術(shù)和新興的干擾對(duì)準(zhǔn)技術(shù)。之后,通過(guò)分析上述兩種技術(shù)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(duì)功率控制技術(shù)和干擾對(duì)準(zhǔn)技術(shù)在異構(gòu)網(wǎng)絡(luò)場(chǎng)景下的應(yīng)用方案分別進(jìn)行了改進(jìn)和優(yōu)化,使功率控制方法能夠?qū)崿F(xiàn)根據(jù)基站周圍用戶分布情況進(jìn)行自動(dòng)調(diào)控,干擾對(duì)準(zhǔn)方案的預(yù)編碼矩陣選取更有利于接收性能的提高。仿真結(jié)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(duì)準(zhǔn)方案能夠?qū)崿F(xiàn)LTE-A異構(gòu)網(wǎng)絡(luò)系統(tǒng)性能的進(jìn)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(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5

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