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1、论文题目：空时编码与波束形成技术的研究专 业：通信与信息系统硕 士 生：陈振华 （签名） 指导老师：王衍文 （签名） 摘 要空时编码技术是一种将信道编码技术与天线分集技术相结合，且能提供远高于传统单天线系统的频带利用率的编码技术。而波束形成技术则可根据系统的各种性能指标，完成对基带用户信号的最佳组合或分配。基于空时编码的发射分集技术与下行波束形成技术是解决下行链路信号质量的两种有效手段, 本论文就是在此基础上提出一种多天线的解决方案。在传统的空时编码技术中，可以将其分为三种。三种编码各有其优缺点。论文中分别对三种空时编码技术的编码和译码进行研究和对比，并通过系统仿真得出其优缺点。波束形成技术的
2、目的在补偿无线传播过程中，有效的降低空间损耗与多径效应等，从而提高信号的抗衰落与失真的性能，同时降低同信道用户之间的干扰等等。论文对波束形成技术的准则算法和系统模型等进行了深入的研究。并将盲多用户形成算法跟非盲多用户形成算法做了深入的研究。 本文主要结合空时编码和波束形成技术，给出了一种八天线增加全向信道覆盖的方案，通过研究对比二天线系统与四天线系统，八天线的引入可以进一步增加分集增益，并能够在单通道发射功率受限时进一步增加广播信道的覆盖。使用空时编码结合波束形成技术的方案将会给系统带来诸多好处。 最后的仿真结果验证了本文提出八天线方案的信道分集增益优于四天线的信道分集增益，也验证了本文提出方
3、案的有效性。关 键 词：空时编码；波速形成；SFBC；天线研究类型：理论研究Subject ：research on technology of space-time coding and beamformingSpecialty ：Communication and Information SystemName ：Chen Zhenhua （Signature） Instructor ：Wang Yanwen （Signature） ABSTRACTSpace-time coding technology is one kind of coding technology which comb
4、ines channel coding technology with antenna diversity technology, and can improve the efficiency of transmission frequency which is superior to the traditional single-antenna system. According to various performance indicators, beam-forming technology can effectively combine and distribute signals o
5、f baseband users. Launching and transmitting of space-time coding technology and downlink technology are two effective methods which can improve the quality of solving downlink signals. Based on those two methods, this paper presentes a multi-antenna scheme.There are three types of traditional space
6、-time coding technology, and each of them has its own advantages and disadvantages. From the aspects of coding and decoing, research and comparison of three types are done to obtain their strong and weak points through systematic simulating. The aim of beam-forming is to reduce the space loss and mu
7、ltipath effects effectively and improve the capability of signals anti-distortion and anti-fading, then to lessen the interference of co-channel users in the process of wireless communication. Deep research is conducted on algorithm and system model of beam-forming technology, and more efforts are m
8、ade to analyse the forming algorithm of blind multi-user and unblind multi-user .Combined space-time coding technology with beam-forming technology, this paper proposes a scheme which can strengthen the coverage of omnidirectional channel. Through the analysis of two antenna system and four antenna
9、system, the introduction of eight antenna system can improve diversity gain and strengthen the coverage of broadcasting channel under the circumstances of single-channel transmission power limited. Accordingly, the usage of beam-forming technology will bring many benefits to the system.The final sim
10、ulation result in this paper examines that the channel diversity gain of eight antenna is superior to four antenna and that the proposed scheme is effective.Key words : Space-time coding beam-forming STBC antennaThesis : Theoretical Research目录目 录第一章第一章 绪论绪论.11.1 移动通信系统概述.11.2 4G 的关键技术.21.3 空时编码技术.41.4 波束形成技术.61.5 主要研究内容及结构安排.7第二章第二章 空时编码技术空时编码技术.92.1 空时编码技术编码.92.1.1 LSTC 编码.92.1.2 STTC 编码 .112.1.3 STBC 编码.122.2 空时编码技术译码.162.2.1 LSTC 的译码.
