构成第四代移动通信关键技术的原理及检测.pdf

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1、MIMO-OFDM论文题目：构成第四代移动通信关键技术的原理及检测院（系）：计算机与通信学院专业年级：计算机科学与技术（物联网方向）姓名：XXXX学号：XXXXXXX指导教师：XXX日期：X年X月X日摘要在所有的4G候选方案中，多天线正交频分复用技术(MIMO-OFDM)受到广泛青睐。一方面，MIMO技术可以在不额外增加系统带宽的情况下提高频谱效率，成倍地提高系统容量。另一方面，OFDM技术可以解决MIMO对抗频率选择性衰落和符号间干扰的局限性。空时编码技术是能够获得MIMO系统带来好处的一种有效的方法，它通过增加空间

2、分集增益减弱多径衰落的影响从而获得较高的吞吐量。在与MIMO-OFDM相关的多种技术中，多用户的MIMO-OFDM系统最受关注，但此系统存在的多址干扰和多径信道失真会降低解调器输出的判决信息的可靠性，为解决这一问题需要提出有效的空时信号处理方案。多用户检测(Multi-userDetection，MUD)技术就是从接收机端解决多用户干扰的一种有效方法。本文首先对MIMO-OFDM系统的基本原理进行分析，介绍空时编码的原理和设计，以STBC编译码为例介绍其设计准则并分析性能。然后在多用户MIMO-OFDM系统上行链路中采

3、用优化的发送和接收策略有效的抑制了共信道干扰。本文采用基于最小均方误差的空时多用户检测，通过优化排序迭代结构，使得接收检测算法取得较好的性能。最后针对实际的频率选择性MIMO信道环境，研究了信道中存在的相关性对系统的影响，并把多用户检测算法应用到相关信道，以求更为客观实际认识检测算法的性能。仿真表明这种空间上的相关性对MIMO-OFDM系统多用户检测算法也有不容忽视的影响。关键词：多天线；OFDM(正交频分复用)；空时编码；多用户检测目录1绪论······································

4、·······································································································41.1无线通信系统的发展·················································································································41.2研究背景·························

5、············································································································51.2.1MIMO技术···························································································································61.2.2OFDM技术·······

6、····················································································································71.2.3多用户检测器的设计发展方向························································································82MIMO-OFDM系统与多用户检测技术··················

7、·········································································102.1移动无线信道传播特性···········································································································102.1.1大尺度衰落·······················································

8、·······························································102.1.2小尺度衰落···························································································