基于GNURadio与USRP平台的OFDM系统的研究

发布时间：2018-03-14 16:18

本文选题：软件无线电　切入点：GNURadio　出处：《北京邮电大学》2014年硕士论文　论文类型：学位论文

【摘要】：最近三十多年来,无线移动通信领域发展迅速。软件无线电自1992年由于军事通信需要被提出以来,从理论发展到了实际平台。简单地说,软件无线电就是指在硬件平台上,采用软件编程来实现通信的一种新的无线电技术。目前使用最广泛的软件无线电平台是GNURadio和USRP的组合口正交频分复用OFDM是一种特殊的多载波调制方式。OFDM的优点是可以有效的对抗符号间干扰,频谱效率很高。缺点是对定时和频率偏移敏感,峰均比较大。现在OFDM已经是4G标准的核心技术,在移动通信系统的应用势在必行。本文研究平台是GNURadio和USRP平台,研究对象是OFDM系统。通过分析软件无线电平台的结构和OFDM的基本原理,实现了在GNURadio和USRP平台上实现OFDM收发系统,并对实际测量结果进行分析。进行数据包发送接收测量时,通过添加信道编码模块提高了系统的可靠性；在平台上实现了能量检测算法,测量频谱占用情况；最后使用m序列相关法,通过发送m序列与接收信号做相关运算,测量出室内的信道响应。
[Abstract]:In recent 30 years, the field of wireless mobile communication has developed rapidly. Software radio has been developed from theory to practical platform since 1992 because of the need of military communication. A new radio technology for communication using software programming. The most widely used software radio platform is the combined port of GNURadio and USRP. Orthogonal Frequency Division Multiplexing (OFDM) is a special multicarrier modulation method. The advantage of OFDM is that it can effectively resist inter-symbol interference, and the spectrum efficiency is very high, but the disadvantage is that it is sensitive to timing and frequency offset. Now OFDM is the core technology of 4G standard, so it is imperative to apply it in mobile communication system. The research platform of this paper is GNURadio and USRP, and the research object is OFDM system. By analyzing the structure of software radio platform and the basic principle of OFDM, the OFDM transceiver system is realized on GNURadio and USRP platform. The reliability of the system is improved by adding the channel coding module, and the energy detection algorithm is implemented on the platform to measure the spectrum occupation. Finally, the channel response is measured by using m sequence correlation method and correlation operation between m sequence and received signal.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.53

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