LTE的关键技术和移动通信的未来发展

2020-04-17 04:08

中国地质大学江城学院毕业设计(论文)

分类号 密级 ________ U D C________

中国地质大学江城学院 毕业设计(论文)

LTE的关键技术和移动通信的未来发展

姓 名: 杨 美 荣

专 业: 通 信 工 程

班 级: 29001201

学 号: 2900120121

指导教师:吴国平 教授

论文外文题目:LTE key technologies and the future development of mobile communications I

中国地质大学江城学院毕业设计(论文)

论文主题词:LTE,移动通信

外文主题词:LTE,Mobile Communication

论文答辩日期:

答辩委员会主席: 评阅教师:

原创性声明

本人呈交的毕业论文,是在导师的指导下,独立进行研究工作所取得的成果,所有数据、图片资料真实可靠。尽我所知,除文中已经注明引用的内容外,本毕业论文的研究成果不包含他人享有著作权的内容。对本论文所涉及的研究工作做出贡献的其他个人和集体,均已在文中以明确的方式标明。本毕业论文的知识产权归属于培养单位。

II

中国地质大学江城学院毕业设计(论文)

本人签名: 日期: ______________

摘 要

LTE(Long Term Evolution,长期演进)是由3GPP(The 3rd Generation Partnership Project)组织规划的UMTS(Universal Mobile Telecommunications System)技术标准的长久演变,2004年的12月份,在3GPP多伦多会议上正式成立且启动。LTE系统引入了OFDM(Orthogonal Frequency Division Multiplexing,正交频分复用)和MIMO(Multi-Input & Multi-Output)等关键技术,明显提升了频谱效率和数

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中国地质大学江城学院毕业设计(论文)

据传输的速率(20M带宽在2X2MIMO在64QAM情况下,理论值下行最大传输速率为201Mbps,考虑到信令消耗后大约是150Mbps,但根据现实网络以及终端能力的限制,人为定义下行峰值速率为100Mbps,上行峰值速率为50Mbps),并支持多种带宽分流:1.4MHz,3MHz,5MHz,10MHz,15MHz和20MHz等,且支持全球主流2G/3G频段和一些新增频段,频谱分配相比之前较为简便,也明显的提高系统的容量和覆盖率。架构逐渐走向扁平化和简单化,很大程度减少了网络节点和系统的复杂程度。由于减少了系统时延,所以也减少了网络部署和维护系统的成本。LTE系统支持与其他3GPP系统互操作。根据双工方式不同LTE系统分为FDD-LTE(Frequency Division Duplexing)和TDD-LTE (Time Division Duplexing),二者技术的主要区别在于空口的物理层上(像帧结构、时分设计、同步等)。在TDD系统下行使用相同的频带传输在不同的时段,和下行FDD系统接口使用成对的乐队可以传输和接收数据,和TDD模式相比,FDD频谱利用率低。

本文就LTE现阶段的关键技术和移动通信的未来发展展开讨论。其中包含FDD-LTE,TD-LTE的区别,载波扩容,载波聚合,OFDM和MIMO等关键技术,以及移动通信行业未来的发展。

关键词:LTE TD-LTE FDD-LTE OFDM MIMO

ABSTRACT

LTE (long term evolution, long term evolution) is by the 3GPP (the 3rd generation partnership project, long term evolution of the universal mobile telecommunication system, the third generation partnership project) made of UMTS (universal mobile telecommunications system) technology as the standard, in December 2004 in 3GPP Toronto meeting officially approved and start. The LTE system introduced OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing) and MIMO (Multi-Input & Multi-Output, multiple input multiple output) technology, significantly increase the spectrum

IV

中国地质大学江城学院毕业设计(论文)

efficiency and data transmission rate (20M bandwidth of 2X2MIMO in the case of 64QAM, the theoretical maximum downlink transmission rate of 201Mbps, remove the signaling overhead after about 150Mbps, but according to the actual network and terminal capacity constraints, is generally believed that the downlink peak rate of 100Mbps, 50Mbps) on the behavior, and supports a variety of bandwidth allocation: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz, and the support of the global mainstream 2G/3G band and some new bands, and thus more flexible spectrum allocation, system capacity and coverage also significantly improved. LTE system network architecture is more simplified, reducing the complexity of the network nodes and system, thus reducing the system delay, but also reduces the network deployment and maintenance costs. LTE system support for interoperability with other 3GPP systems. Fdd-lte (frequency division duplexing) and tdd-lte (time division duplexing) according to the different duplex LTE Systems, the main difference between the two technologies is empty of physical layer on (like frame structure, time design and synchronization). Downlink FDD system interface using paired bands can transmit and receive data, and systems in TDD uplink and downlink use the same frequency band transmission in different time slots, a duplex FDD mode, TDD has a higher spectrum utilization.

This topic mainly studies the key technologies and future development trend of LTE in the present stage. Which contains TD-LTE, FDD-LTE difference, carrier expansion, carrier aggregation, OFDM and MIMO and other key technologies, as well as the future development of the mobile communications industry.

Keywords: LTE TD-LTE FDD-LTE OFDM MIMO

目 录

1 引言 ........................................................ 1

1.1 LTE产生的背景 ........................................................ 1 1.2 LTE产生的意义 ........................................................ 1 1.3 LTE发展的目的 ........................................................ 1

2 LTE的关键技术 ............................................... 1

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