本文選題：LTE + 小區(qū)間干擾��； 參考：《內(nèi)蒙古大學》2017年碩士論文

【摘要】：OFDM技術的引入使得LTE系統(tǒng)中,采用SC-FDMA技術的上行鏈路與采用OFDMA技術的下行鏈路都能保證小區(qū)內(nèi)用戶之間的正交性[1],很好的解決了小區(qū)內(nèi)干擾的問題。但是寬帶移動通信對頻譜效率的要求使得LTE系統(tǒng)不適合再采用傳統(tǒng)蜂窩網(wǎng)絡中的小區(qū)間頻率復用技術來解決小區(qū)間干擾的問題[2]。但同頻組網(wǎng)方式又會使得小區(qū)間的同頻干擾非常嚴重。因此小區(qū)間干擾問題是LTE系統(tǒng)中的重中之重。小區(qū)所承載的業(yè)務與小區(qū)間干擾的產(chǎn)生息息相關,不同地區(qū)的小區(qū)所承載的業(yè)務會有不同的特點。因此了解業(yè)務的種類、參數(shù)以及密度與干擾之間的關系,對控制小區(qū)間的干擾,以及網(wǎng)絡的規(guī)劃與設計都有重要的意義。本文主要對LTE系統(tǒng)中的小區(qū)間干擾問題進行了逐步深入的研究,從理論角度進行分析,同時利用OPNET系統(tǒng)級仿真平臺進行系統(tǒng)級的仿真,并且對仿真結果進行了詳細的分析與描述。首先對其干擾的成因與分類進行了討論與分析。并通過OPNET平臺搭建場景進行仿真,通過仿真數(shù)據(jù)來體現(xiàn)和分析干擾的影響,同時確定仿真過程中需要收集的統(tǒng)計數(shù)據(jù)。然后對業(yè)務承載與干擾的關系分別從業(yè)務的種類、業(yè)務的參數(shù)、業(yè)務的密度,這三個角度進行論述和仿真驗證。最后對小區(qū)間干擾抑制問題進行研究,介紹和比較了幾種典型的小區(qū)間干擾抑制技術,并對其中ICIC技術進行了明確的分類。并通過OPNET平臺搭建了軟頻率復用的系統(tǒng)級仿真場景,來表現(xiàn)軟頻率復用帶來的性能提升。
[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.
【學位授予單位】：內(nèi)蒙古大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.5

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