【作者】 冯钊；

【导师】 桑新柱；

【作者基本信息】 北京邮电大学 ， 电子与通信工程（专业学位）， 2013， 硕士

【摘要】 LTE是3GPP的长期演进项目,它是以OFDM和MIMO作为主要技术特征,支持更高的系统带宽,以及更快的数据速率。作为3G到4G的过渡,LTE实现了系统性能的很好提升,而后续LTE-A也被广泛地关注和研究,LTE在国内的研究十分广泛,且研究成果十分丰富。本文将以LTE相关协议作为仿真和研究的主要依据,使用matlab仿真工具进行LTE链路级仿真,以仿真曲线作为性能分析的依据。论文在综合研究移动通信系统的发展历程,LTE系统的目标,主要性能和多种LTE系统中的关键技术的基础上,选取LTE链路级仿真作为主要的仿真平台,系统地研究了链路级仿真技术,以物理层协议作为实现平台的依据,对LTE链路级仿真中所涉及的链路级技术进行了模块分类,完成了仿真平台的部分设计,并实现了功能模块的搭建,土行链路部分重点实现PUCCH信道的模块搭建,对PUCCH的多种格式进行了分析,并在完成平台模块的基础上进行了相应功能的仿真工作,采用BLER等作为性能指标,通过仿真曲线验证性能。本文的研究重点是多用户检测技术,在对传统的多用户检测算法研究的基础上,学习了多种多用户检测器的原理,并选取了一种多用户检测算法进行了功能模块的实现和添加,设定PUCCH formats2a/2b的多用户检测作为研究对象,通过算法理论分析和仿真性能曲线,对算法提出了能够有效提高参考信号的利用率,同时得到较好多用户检测性能的算法改进,并通过仿真实现验证了改进后算法的可行性。在波束赋形技术方面,文章研究了单用户单流波束赋形和单用户双流波束赋形,选取了波束赋形的GOB和EBB算法进行了详细地分析,并在仿真平台上进行了算法功能模块的实现,分别对两种算法的性能进行了仿真验证,并取得了相应的分析结果。更多还原

【Abstract】 LTE is the3GPP Long Term Evolution project, which uses OFDM and MIMO as its main technical features, and supports higher system bandwidth, and faster data rates. As a transition from3G to4G, LTE achieves a good system performance, LTE-A has also been in extensive attention, the research results of LTE is very rich.This article will use LTE related protocols as the main basis of the simulation and research, and uses matlab simulation tool to do LTE link level simulation and simulation curve to make performance analysis.On the basis of the study of the development of the mobile communication system, the goal of the LTE system, performance indicators, and LTE systems technologies, this paper selects LTE link level simulation as the simulation platform, does a systematic study of the link level simulation technology, and uses the physical layer protocols as the basis,it does module classification, and completes the part of the design of the simulation platform. For the uplink part, the focus is PUCCH channel module structures, this paper analyses multiple formats of PUCCH, and simulates corresponding function on the completed platform, using BLER etc as performance indicators, does performance verification based on the simulation curve.The focus of this research is multi-user detection technology, this paper studies traditional multi-user detection algorithm and a variety of multi-user detectors, a multi-user detection algorithm is selected to complete functional modules and add to the platform, set PUCCH formats2a/2b multi-user detection as a research object, based on the algorithm theoretical analysis and simulation performance curve, the proposed algorithm can effectively improve the utilization of the reference signal, and get better multi-user detection algorithm performance improvements and simulation verify the feasibility of the improved algorithm.For beamforming technology, the paper studies single-user single-stream beamforming and single user double-stream beamforming, selects the GOB and EBB beamforming algorithm and makes a detailed analysis, and completes the algorithm module on the simulation platform, simulates the performance of the two algorithms and gets the analysis results.更多还原