LTE关键技术研究修稿.doc

摘要 国际标准化组织3GPP于2004年底启动了UMTS长期演进(Long Term Evolution，LTE)技术的研究，以实现3G技术向E3G和4G的平滑过渡。LTE改进并增强了3G的空中接入技术,采用OFDM及MIMO技术作为其无线网络演进的唯一标准。 首先对LTE进行了系统概述。主要介绍了LTE的技术背景，性能指标，网络结构以及LTE的发展现状及前景等内容。 接下来介绍了MIMO技术以及系统性能增益和LTE系统，研究了MIMO系统的信道模型和信道容量，分析和仿真了几种典型系统的平均信道容量。比较了这几种系统之间容量的差异，比较了这几种系统之间容量的差异以及采用不同功率分配方案时MIMO信道容量的关系。然后讨论了MIMO系统中空时编码技术，空间复用技术以及贝尔实验室空时分层(BLAST)结构的基本原理，空时检测算法等。 关键字：LTE MIMO 空时分层 信道容量  Abstract International organization for standardization 3GPP initiated Long Term Evolution(LTE) technology standardization work at the end of 2004 and thus fulfill smoothed transition from 3G to E3G and 4G．LTE improved and strengthened the 3G airborne turning on technology, used OFDM and the MIMO technology as its wireless network evolution’s unique standard. First has carried on the system outline to LTE.Mainly introduced the LTE technical background, the performance index, contents and so on network architecture as well as LTE development present situation and prospect. Met down introduced the MIMO technology as well as the system performance gain and the LTE system, has studied the MIMO system channel model and the channel capacity, the analysis and the simulation several kind of canonical system average channel capacity.Compared with these kind of systems between the capacity difference, compared with these kind of systems between the capacity difference as well as used when the different power distribution plan the MIMO channel capacity relations.Then discussed in the MIMO system the free time code technology, the spatial multiplying technology as well as the Bell Lab free time lamination(BLAST) structure basic principle，analyzing the detected algorithm of MIMO and so on. Key word：LTE MIMO BLAST channel capacity 目录 摘要 I Abstract II 目录 III 第一章 绪论 1 1.1 LTE的技术背景及演进情况 1 1.2 LTE的主要性能指标 3 1.3 LTE的网络结构和空中接口协议 4 1.4 LTE的发展现状与前景 4 1.4.1 LTE技术优势 4 1.4.2 LTE技术未来发展趋势展望 6 1.5 论文工作安排及贡献 6 第二章 MIMO系统及其在LTE中应用 8 2.1 LTE物理层关键技术 8 2.1.1 SC—FDMA技术 8 2.1