SC-FDE和OFDM双模式通信系统的设计与实现

发布时间：2018-01-17 20:10

本文关键词：SC-FDE和OFDM双模式通信系统的设计与实现　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：正交频分复用(OFDM)技术是将高速的数据流转换成低速的多个子数据流进行传输,这些子数据流对应的传输信号相互正交且频谱相互交叠。因此其具有频带利用率高、抗多径干扰等优点;单载波频域均衡(SC-FDE)技术是在频域上进行的均衡从而使均衡器的设计得到了大大的简化。它不需要考虑峰均比抑制问题同时也具有很好的对抗多径和符号间干扰的能力。因此,正交频分复用(OFDM)技术和单载波频域均衡(SC-FDE)技术在现代高速无线通信的传输中都有广泛的应用,它们都是高速传输通信系统中的备选传输技术。综上,研究这两种技术的融合或协同传输是具有重要的应用价值的。本文在探讨了无线信道的基本特点和信道的这些特性对传输信号产生的影响的基础上,主要进行了以下工作:⑴完成了单载波频域均衡(SC-FDE)通信系统的设计、程序编写及仿真分析。探讨了SC-FDE技术的基本原理和系统实现的基本模型,并且重点研究了SC-FDE通信系统中帧结构的设计以及帧结构中独特字(UW)的产生、紧接着论文对SC-FDE中的信道估计过程进行了详细探讨,对频域均衡这一关键技术中的三种准则进行了研究,最后对SC-FDE系统进行了仿真、分析和比较,完成了系统实现的设计。⑵完成了正交频分复用(OFDM)通信系统的设计、程序编写及仿真分析。探讨了OFDM技术的基本原理,在此基础上对OFDM通信系统中的各个模块功能进行了研究,同时也研究了OFDM通信系统中的同步、信道编码、降低峰均比等关键技术,最后对系统进行了仿真、分析和比较,完成了系统实现的设计。⑶根据项目的需求,完成了基于OFDM和SC-FDE双模通信系统的设计。在前文理论和实践的基础上,从结构和性能上对OFDM和SC-FDE系统进行了比较和分析,进而完成了双模通信系统的设计,并且通过硬件平台的验证对系统的程序进行了改进,程序测试结果表明系统设计是可行的,整个系统具有很好的对抗多径干扰的能力。由于时间原因,目前硬件部分还未全部调试完成,整体模块的联调还在验证过程中。
[Abstract]:Orthogonal Frequency Division Multiplexing (OFDM) technology converts high-speed data streams into low-speed sub-data streams for transmission. The transmission signals corresponding to these sub-data streams are orthogonal to each other and the spectrum overlaps with each other, so it has the advantages of high band efficiency and anti-multipath interference. Single carrier frequency domain equalization (SC-FDE). The technique of equalization in frequency domain makes the design of equalizer greatly simplified. It does not need to consider PAPR suppression problem but also has a good ability to resist multi-path and inter-symbol interference. OFDM (orthogonal Frequency Division Multiplexing) and SC-FDE (single Carrier Frequency Domain Equalization) are widely used in modern high-speed wireless communication. They are all alternative transmission technologies in high-speed transmission communication systems. It is of great value to study the fusion or cooperative transmission of these two technologies. In this paper, the basic characteristics of wireless channel and the influence of these characteristics on the transmission signal are discussed. The main work is as follows: 1. The design of SC-FDE communication system with single carrier frequency domain equalization is completed. Programming and simulation analysis. The basic principle of SC-FDE technology and the basic model of system implementation are discussed. And focus on the design of frame structure in SC-FDE communication system and the generation of unique word in frame structure. Then the paper discusses the channel estimation process in SC-FDE in detail. In this paper, three criteria of frequency domain equalization are studied. Finally, the simulation, analysis and comparison of SC-FDE system are carried out. The design of OFDM (orthogonal Frequency Division Multiplexing) communication system is completed. 2. The basic principle of OFDM technology is discussed. On this basis, the functions of each module in OFDM communication system are studied, and the key technologies such as synchronization, channel coding and PAPR reduction in OFDM communication system are also studied. Finally, the system is simulated, analyzed and compared, and the design of the system is completed according to the requirements of the project. The design of dual-mode communication system based on OFDM and SC-FDE is completed. Based on the previous theory and practice, the structure and performance of OFDM and SC-FDE systems are compared and analyzed. Furthermore, the design of dual-mode communication system is completed, and the program of the system is improved through the verification of hardware platform. The program test results show that the system design is feasible. The whole system has a good ability to resist multipath interference. Due to the time reason, the hardware part has not been completely debugged and the whole module is still in the process of verification.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.53

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