下一代移动通信的关键技术研究

发布时间：2018-04-01 01:09

本文选题：正交频分复用(OFDM)　切入点：多输入多输出(MIMO)　出处：《南京邮电大学》2014年硕士论文

【摘要】：当前4G移动通信系统发展迅猛，新一代移动通信系统可以为用户提供高速的数据传输速率，提供给用户高的传输速率。与3G移动网络物理层以CDMA技术为核心不同，4G移动通信系统可以提供数据传输速率高达100Mb/s甚至更高的通信业务。实现这样高速率和大容量的通信需要频谱效率极高的传输技术。正交频分复用(OFDM)技术是一种非常高效的多载波调制技术，其多载波之间可以相互正交，通过为不同的用户分配不同的子载波来区分用户。MIMO技术实质上是在发送端和接收端分别使用了多个收/发天线，不管天线间距的大小，从而改善了对每个通信终端用户的服务质量，提高了通信质量和数据速率。4G移动通信的物理层将以OFDM为核心，，以MIMO等技术为辅助，将极大的提高频谱的利用率。本论文首先论述移动通信技术的发展与演进，其次介绍了LTE的网络结构，包括整体结构、无线协议结构以及FDD、TDD帧结构和两者的同步发展带来的影响；通过描述TD-LTE系统中的OFDM技术、MIMO多天线技术、OTDM链路自适应技术，来介绍LTE系统的核心技术的发展及应用；对移动无线通信系统的天线技术发展中网络建设－覆盖能力进行分析，对深度覆盖问题进行了描述；通过运营商LTE无线网络建设规划以及无线网络下行功率控制案例，为下一代移动通信的关键技术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.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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