滤波器组多载波关键技术研究

发布时间：2018-01-04 06:17

本文关键词：滤波器组多载波关键技术研究　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：正交频分复用(OFDM)是当下应用最为广泛的多载波传输技术,其具有结构简单,理想状况下无载波和符号间干扰及与多天线技术完美结合等优点。然而,随着第五代移动通信的发展,OFDM所具有的旁瓣泄漏大导致在由于频率时间同步有偏差时正交性丢失,以及由于添加循环前缀(CP)导致频谱效率低下等缺点就凸显出来了,限制了其在第五代移动通信中的应用,因此,人们一种新的技术,滤波器组多载波(FBMC)。与OFDM相比,FBMC频率聚焦性强,频谱效率高,然而,FBMC在系统结构上比OFDM复杂很多,在一些关键技术上需要更加复杂的算法。本文首先对FBMC系统进行了详细研究,并与OFDM系统进行了对比,指出与OFDM的区别和特性。其中最重要的一点就是系统的固有载波间和符号间干扰问题。由于固有干扰的存在,在FBMC信道估计中不能使用传统OFDM中的导频方法,第三章针对FBMC中的信道估计问题进行了研究,对现有的导频对(POP)和干扰近似方法(IAM)进行了研究和仿真,指出了其缺陷,并在IAM方法的基础上提出了一种创新的用于消除系统固有干扰而进行准确信道估计的辅助导频方法(AP),仿真结果表明了采用辅助导频可以有效消除干扰,并达到比OFDM更优的性能。接下来,本文提出了一种自适应均衡算法,用于FBMC接收机,用以改善基于导言的信道估计的性能低下问题。另外,由于固有干扰的存在,也会导致FBMC与MIMO技术结合中的一些方面与OFDM不同。本文首先分析了FBMC-MIMO中的最大似然(ML)检测中存在的问题,然后提出了一种创新的MMSE-ML方案用于最大似然检测,并进行了仿真。
[Abstract]:Orthogonal frequency division multiplexing (OFDM) is the most widely used multi carrier transmission technology for the current application, which has the advantages of simple structure, no carrier and inter symbol interference and perfect and multi antenna technology combined with the advantages of ideal conditions. However, with the development of the fifth generation mobile communication, OFDM has a large sidelobe leakage caused loss of orthogonality the time synchronization is due to frequency deviation, and the cyclic prefix (CP) cause the spectrum efficiency of the traditional is highlighted, limiting its application in the fifth generation mobile communication so that people with a new technology, multi carrier filter group (FBMC). Compared with OFDM, FBMC frequency focusing strong, high spectrum efficiency, however, the FBMC system structure is much more complicated than OFDM, the need for more sophisticated algorithms in some key technologies. This paper makes a detailed research on the FBMC system, and compared with the OFDM system, Pointed out the difference between OFDM and the interference characteristics. One of the most important point is the intrinsic carrier system. Due to the inherent inter symbol interference, channel estimation in FBMC cannot be used in pilot method in traditional OFDM, the third chapter studies to solve the problem of channel estimation in FBMC was carried out, the pilot of the the current (POP) and interference approximation method (IAM) is studied and simulated, and points out its defects, and put forward to eliminate the inherent interference system is an innovative and auxiliary pilot channel estimation method based on the method of IAM (AP), the simulation results show that the auxiliary pilot can to effectively eliminate interference, and achieve better performance than OFDM. Next, this paper proposes an adaptive equalization algorithm for FBMC receiver, to improve the problem of low performance based on the introduction of the channel estimation. In addition, due to the inherent interference It also leads to some differences between FBMC and MIMO technology. OFDM is different from OFDM. First of all, the problems of maximum likelihood (ML) detection in FBMC-MIMO are analyzed. Then an innovative MMSE-ML scheme is proposed for maximum likelihood detection, and simulation is carried out.

【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713;TN929.53

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