本文選題：正交頻分復用(OFDM)　切入點：多輸入多輸出(MIMO)　出處：《南京郵電大學》2014年碩士論文

【摘要】：當前4G移動通信系統(tǒng)發(fā)展迅猛，新一代移動通信系統(tǒng)可以為用戶提供高速的數(shù)據(jù)傳輸速率，提供給用戶高的傳輸速率。與3G移動網(wǎng)絡物理層以CDMA技術為核心不同，4G移動通信系統(tǒng)可以提供數(shù)據(jù)傳輸速率高達100Mb/s甚至更高的通信業(yè)務。實現(xiàn)這樣高速率和大容量的通信需要頻譜效率極高的傳輸技術。正交頻分復用(OFDM)技術是一種非常高效的多載波調制技術，其多載波之間可以相互正交，通過為不同的用戶分配不同的子載波來區(qū)分用戶。MIMO技術實質上是在發(fā)送端和接收端分別使用了多個收/發(fā)天線，不管天線間距的大小，從而改善了對每個通信終端用戶的服務質量，提高了通信質量和數(shù)據(jù)速率。4G移動通信的物理層將以OFDM為核心，，以MIMO等技術為輔助，將極大的提高頻譜的利用率。 本論文首先論述移動通信技術的發(fā)展與演進，其次介紹了LTE的網(wǎng)絡結構，包括整體結構、無線協(xié)議結構以及FDD、TDD幀結構和兩者的同步發(fā)展帶來的影響；通過描述TD-LTE系統(tǒng)中的OFDM技術、MIMO多天線技術、OTDM鏈路自適應技術，來介紹LTE系統(tǒng)的核心技術的發(fā)展及應用；對移動無線通信系統(tǒng)的天線技術發(fā)展中網(wǎng)絡建設－覆蓋能力進行分析，對深度覆蓋問題進行了描述；通過運營商LTE無線網(wǎng)絡建設規(guī)劃以及無線網(wǎng)絡下行功率控制案例，為下一代移動通信的關鍵技術研究提供一些合理的方向。
[Abstract]:With the rapid development of 4G mobile communication system, the new generation mobile communication system can provide users with high data transmission rate and high transmission rate.Different from 3G mobile network physical layer with CDMA technology as the core, 4G mobile communication system can provide communication services with data transmission rate up to 100Mb/s or higher.To achieve such a high speed and large capacity communication requires a very high spectral efficiency transmission technology.Orthogonal Frequency Division Multiplexing (OFDM) is a very efficient multicarrier modulation technique, which can be orthogonal to each other.By assigning different subcarriers to different users, the technology of .MIMO essentially uses a plurality of receiving / transmitting antennas at the transmitter and the receiver, regardless of the size of the antenna spacing.Therefore, the quality of service for each communication end user is improved, and the physical layer of communication quality and data rate. 4G mobile communication will take OFDM as the core and MIMO as the assistant technology, which will greatly improve the utilization rate of the spectrum.This paper first discusses the development and evolution of mobile communication technology, then introduces the network structure of LTE, including the overall structure, wireless protocol structure and the impact of the development of LTE frame structure and synchronization.This paper introduces the development and application of the core technology of TD-LTE system by describing the OFDM technology in OFDM system and the adaptive technology of OTDM link in LTE system, and analyzes the network construction-coverage ability in the development of antenna technology of mobile wireless communication system.This paper describes the problem of depth coverage and provides some reasonable directions for the research of the key technologies of the next generation mobile communication through the construction planning of the LTE wireless network and the downlink power control case of the wireless network.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5

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本文編號：1693278