20124541喻琼MIMO-OFDM系统中基于导频的信道估计技术研究.docx

重庆大学本科学生毕业设计（论文）MIMO-OFDM系统中基于导频的信道估计技术研究学生：喻琼学号导教师：吴玉成专业：通信工程重庆大学通信工程学院二O一六年六月Graduation Design(Thesis) of Chongqing UniversityStudy on Channel Estimation Technology Based Pilot in MIMO-OFDM SystemsUndergraduate: Yu QiongSupervisor: Prof. Wu YuchengMajor: Communication EngineeringCollege of Communication EngineeringChongqing UniversityJune 2016摘要随着无线通信的迅速发展，人们对通信速率，通信容量的需求不断增长，同时也引发了频带资源的紧张。未来的无线通信系统越来越需要提高频带利用率和信道容量。MIMO-OFDM技术因其可以在不增加频带宽度的前提下，成倍地提高通信速率而备受瞩目。同时又能充分利用空间资源，在不增加频谱资源和天线发射功率的情况下，可以成倍的提高系统信道容量，显示出明显的优势、被视为下一代移动通信的核心技术。在无线通信中，信道复杂多变，系统性能急剧下降，因此，对信道进行估计就变得十分必要和重要，信道估计在无线系统中是不可缺少的环节。论文主要研究了OFDM系统中基于导频的信道估计，进而研究了MIMO-OFDM系统中基于导频的信道估计。论文的主要工作如下：研究了SISO-OFDM系统中基于导频的信道估计。导频的插入间隔及导频图样，LS算法，MMSE算法以及LMMSE算法的优缺点。研究了几种典型的信道内插算法，主要有分段常数插值，线性插值，二阶插值以及时域插值等。在MIMO-OFDM系统中，为了避免了天线之间发送导频的相互干扰，研究了MIMO-OFDM系统中基于导频子载波正交的导频设计，利用子载波的正交性，避免了相互干扰。关键词：MIMO-OFDM，信道估计，导频设计ABSTRACTWith the rapid development of wireless communication, the demand for the communication speed and the capacity of the communication is increasing, causing the tension of band resource. The future wireless communication systems need to improve the bandwidth utilization and channel capacity. MIMO-OFDM technology can exponentially increase the communication rate without increasing the bandwidth,which is paid great attention to.It also can make full use of space resources, without any increase in spectrum and antenna transmission power, can exponentially increase the channel capacity, shows obvious advantages, is regarded as the core of the next generation of mobile communication technology. In the wireless communication, the channel is complex and changeable, and the system performance is declining. Therefore, it becomes very necessary and important to estimate the channel.Thesis mainly studied the pilot based channel estimation in OFDM systems, MIMO-OFDM system was put forward based on pilot channel estimation. The paper main arrangement is as follows:the SISO-OFDM is discussed based on pilot chann