【摘要】：隨著4G牌照的發(fā)放，，LTE系統(tǒng)在我國正在開始大規(guī)模商用。由于LTE系統(tǒng)采用的是復(fù)用因子為1的同頻組網(wǎng)，因此小區(qū)間干擾是一個嚴(yán)重的問題。干擾協(xié)調(diào)方案是目前主流的解決LTE系統(tǒng)的小區(qū)間干擾問題的方案，但其存在一定的缺陷。本文在基于對LTE系統(tǒng)關(guān)鍵技術(shù)的分析和對現(xiàn)有的干擾協(xié)調(diào)方案的仿真測試上，提出了一種按距離和SINR綜合考慮的用戶劃歸方案，并通過仿真，驗證了改進方案的有效性。本文主要完成了以下工作： 對干擾協(xié)調(diào)技術(shù)的兩大主流方案——SFR方案和FFR方案進行了詳細(xì)的分析介紹，并分別指出了他們的技術(shù)優(yōu)點和缺點。 詳細(xì)地分析介紹了LTE系統(tǒng)的兩大底層核心技術(shù)——OFDM技術(shù)和MIMO技術(shù)，這兩種技術(shù)是LTE系統(tǒng)抗干擾能力的關(guān)鍵所在。本文還對LTE系統(tǒng)的功率控制和分配進行了介紹，指出了它們對于LTE系統(tǒng)抗干擾的關(guān)鍵性。LTE系統(tǒng)技術(shù)的介紹對于后面的技術(shù)改進具有重要意義。 詳細(xì)介紹了搭建LTE系統(tǒng)級仿真平臺的過程。搭建過程首先是從整體了解通信系統(tǒng)的仿真；然后從基站側(cè)、用戶側(cè)、噪聲模型和業(yè)務(wù)模型等方面逐個模塊搭建LTE的系統(tǒng)級仿真平臺；最后列舉了仿真評估的指標(biāo)，主要包括用戶可接入率、小區(qū)信噪比分布、系統(tǒng)容量、各調(diào)制模式占比等。仿真平臺的搭建對于后續(xù)方案的改進提供了測試平臺，并且對最終的效果驗證提供了支持。 在分析了傳統(tǒng)方案的不足之后，針對老方案的缺陷提出了一種新方案，并進行仿真對比。首先對干擾協(xié)調(diào)技術(shù)的分類進行了介紹，詳細(xì)闡述了靜態(tài)干擾協(xié)調(diào)，半靜態(tài)干擾協(xié)調(diào)和動態(tài)干擾協(xié)調(diào)三種干擾協(xié)調(diào)方式。然后對傳統(tǒng)的干擾協(xié)調(diào)方案進行仿真測試，在證明干擾協(xié)調(diào)方案比普通的頻率復(fù)用方案更有優(yōu)勢的同時，也指出其依然有需要改進的地方。接下來，本文提出了一種基于對小區(qū)用戶按照SINR和距離的綜合考慮進行劃歸的新方案。最后，利用本文搭建好的LTE系統(tǒng)級仿真平臺對改進方案進行仿真驗證，并與傳統(tǒng)的SFR方案和頻率復(fù)用方案進行對比，得出改進方案提升了系統(tǒng)的各方面性能的結(jié)論。
[Abstract]:With the issuance of 4G license, LTE system is being used on a large scale in our country. Since the LTE system uses a co-frequency network with a multiplexing factor of 1, inter-cell interference is a serious problem. Interference coordination scheme is the mainstream solution to the inter-cell interference problem in LTE systems, but it has some defects. Based on the analysis of the key technology of LTE system and the simulation test of the existing interference coordination scheme, this paper puts forward a user attribution scheme considering the distance and SINR synthetically, and verifies the effectiveness of the improved scheme by simulation. The main work of this paper is as follows: two main schemes of interference coordination technology, SFR scheme and FFR scheme, are analyzed and introduced in detail, and their technical advantages and disadvantages are pointed out respectively. In this paper, two basic core technologies of LTE system, OFDM and MIMO, are analyzed and introduced in detail. These two technologies are the key to the anti-jamming ability of LTE system. This paper also introduces the power control and distribution of LTE system, and points out that their key to LTE system anti-jamming. LTE system technology is of great significance for the later technical improvement. The process of building LTE system-level simulation platform is introduced in detail. The first step is to understand the simulation of the communication system from the whole, then from the base station side, user side, noise model and business model to build a system-level simulation platform of LTE. Finally, the index of simulation evaluation is listed. It mainly includes user access rate, cell SNR distribution, system capacity, modulation mode ratio and so on. The construction of the simulation platform provides a test platform for the subsequent improvement of the scheme and supports the final effect verification. After analyzing the shortcomings of the traditional scheme, a new scheme is proposed for the defects of the old scheme, and the simulation results are compared. Firstly, the classification of interference coordination technology is introduced, and three kinds of interference coordination modes, static interference coordination, semi-static interference coordination and dynamic interference coordination, are described in detail. Then the simulation test of the traditional interference coordination scheme shows that the interference coordination scheme has more advantages than the common frequency multiplexing scheme, but also points out that it still needs to be improved. Then, this paper proposes a new scheme based on the comprehensive consideration of SINR and distance for cell users. Finally, the improved scheme is verified by using the LTE system-level simulation platform, and compared with the traditional SFR scheme and frequency reuse scheme. The conclusion is that the improved scheme improves the performance of the system in all aspects.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5

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本文編號：2186223