MIMO论文：MIMO通信系统中空时编码的预编码研究.doc

MIMO论文：MIMO通信系统中空时编码的预编码研究【中文摘要】MIMO(Multiple-Input Multiple-OutPut)系统是未来宽带无线移动通信的关键技术之一,采用多天线技术来抑制信道衰落,利用MIMO技术极大的提高了系统的通信容量,在不增加带宽和天线发送功率的情况下,频谱利用率可以成倍地提高,同时也可以提高信道的可靠性,降低误码率,因此,MIMO技术受到了广泛关注。空时编码技术是达到或接近1MIMO无线信道容量的一种可行、有效地方法,它包括基于发射分集的空时编码和空间复用技术。MIMO系统存在的多址干扰和多径衰落会造成接收信号的失真、畸变,为解决这一问题需要提出有效的空时信号处理方案。信号检测技术就是从接收机端解决用户间干扰的一种有效方法。MIMO系统中的预编码技对发射信号进行预处理,可以减少接收机的复杂度,降低符号间的干扰,通过利用反馈的信道信息达到提高系统性能的。本文首介绍了MIMO系统的基本原理及其相关的衰落信道模型和分集技术,接着介绍了MIMO系统中的信号检测技术,然后介绍了空时编码技术的原理和设计准则,分析了基于发射分集技术的空时编码技术,以STBC(Space-time Block Code)编译码为例介绍其设计准则,并对采用不同的收发天线个数的空时分组编码方案的性能进行了仿真分析。最后着重研究了MIMO系统中空时编码的预编码技术,提出了一种带反馈的空时分组码预编码方案,研究了基于信道统计信息的线性预编码,对基于迫零(ZF)准则和最小均方误差(MMSE)准则的线性预编码设计进行了仿真比较,给出了基于成对差错概率(PEP)准则的线性预编码设计,并对采用此设计准则的空时分组编码预编码方案进行了仿真比较。仿真表明采用基于成对差错概率(PEP)准则的线性预编码设计,使得MIMO系统性能有明显的提升。【英文摘要】MIMO (Multiple-Input Multiple-OutPut) system is one of the key technologies in the future of broadband wireless mobile communication, it use the multiple antenna technology to inhibit the fading, the systems communication capacity improved greatly by the MIMO technology, spectrum efficiency can be increased exponentially without increasing the bandwidth and antenna transmit power, it also can improve the reliability of the channel and reduce the error rate, therefore, MIMO technology has been focused in a wide range.Space-time coding technology is a feasible and effective method to achieve the capacity of MIMO radio channel, which includes space-time codes and spatial multiplexing that based on transmit diversity. The multiple access interference and multipath fading of MIMO system can cause the distortion and distortion of signal, we need to come up with effective space-time signal processing program to solve this problem. Signal detection technology is an effective method which solve multi-user interference from the receiver side. the Pre-coding technology of MIMO systems pretreatment the transmit signals to reduce inter-symbol interference, use the feedback information form the channel to improve performances of the system.This article describes the basic principle of MIMO system, fading channel models and diversity techniques, then introduces the multi-user detection techniques in MIMO system, and at last introduced the principles and design criteria of space-time coding, analysis the Advantages and disadvantages between different space-time coding, introduce the design criteria by the example of STBC(Space-time Block Code) decoding, and analysis the performance of different number of antennas of STBC scheme.Finally, the system focused on the Space-Time Coding MIMO pre-coding technique, designed pre-coded scheme with feedback, analysis the design criterion of statistical information based on the optimal channel precoding, and compared the simulation result of the number of MIMO space-time pre-coding scheme with different antenna. The Simulation results show that the space-time multiuser detection algorithm based on minimum mean square error making a better performance of pre-coded technology for space-time coding in a MIMO system.【关键词】MIMO 空时编码 信号检测 预编码 BER性能【英文关键词】MIMO space-time coding signal detection pre-coding BER【目录】MIMO通信系统中空时编码的预编码研究摘要4-5Abstract5目录6-91 绪论9-141.1 引言91.2 研究背景及意义9-131.2.1 MIMO技术9-101.2.2 MIMO系统中的空时编码技术10-121.2.3 MIMO系统中的预编码技术及研究现状12-131.3 本文的主要工作及内容安排13-142 MIMO系统与信号检测技术14-272.1 移动无线信道传播特性14-172.1.1 大尺度衰落14-152.1.2 小尺度衰落15-162.1.3 无线衰落多径信道模型16-172.2 分集合并技术17-192.2.1 分集技术17-182.2.2 分集合并方法18-192.3 MIMO无线通信系统19-212.3.1 MIMO系统信号模型19-202.3.2 MIMO系统的主要特征20-212.4 信号检测技术21-262.4.1 信号检测技术的提出21-222.4.2 迫零(ZF)检测22-232.4.3 最小均方误差(MMSE)检测232.4.4 非线性干扰检测器23-252.4.5 仿真结果25-262.5 本章小结26-273 MIMO系统中的空时编码技术27-393.1 空时编码模型27-293.2 空时编码的设计准则293.2.1 慢衰落瑞利信道的编码设计准则293.2.2 快衰落瑞利信道的编码设计准则293.3 空时编码的性能指标29-313.4 空时网格编码31-333.4.1 空时网格编码的编码方案31-323.4.2 空时网格编码的译码方案323.4.3 空时网格编码性能分析32-333.5 空时分组编码33-383.5.1 Alamouti空时分组编码方案33-353.5.2 Alamouti译码35-363.5.3 Almouti编码性能仿真36-383.6 本章小结38-394 MIMO系统中空时分组编码的预编码39-504.1 MIMO空时系统中的预编码技