DVB-T发射系统的实现及其在医学图像传输中的应用
发布时间：2018-09-10 14:06
【摘要】：数字地面电视广播具有实现成本低、发送接收灵活和覆盖范围广等优点,DVB-T是目前世界上应用范围最广泛的数字地面电视广播系统,由欧洲数字广播电视组制定开发。该系统提供了多种参数选择的组合,可以适应高斯信道以及各种多径信道下视频图像的传输,具有很强的抗干扰抗失真能力。本文主要论述DVB-T系统中多载波传输OFDM调制技术的原理和关键技术,对DVB-T信道编码部分进行了深入的研究和探索。文章的主要研究内容有:详细阐述了OFDM调制的工作原理和实现方法,介绍了几种OFDM调制中的关键技术及这些技术在信号传输过程中起到的作用,如导频技术、循环前缀技术和同步技术,提出了一种新的实现复杂度低,不占据额外带宽的定时同步方法。重点介绍了DVB-T系统OFDM帧结构和信道编码部分各功能模块的原理,给出了各模块具体的算法实现,这些模块主要包括:能量驱散、RS编码、卷积交织、卷积编码、符号交织、比特交织、星座映射、参考信号和OFDM调制。列出了这些模块中主要C++功能函数和关键参数,统一了各模块函数的接口,实现数字基带数据的生成。针对医疗系统的应急通信需求,结合医学图像的传输背景和编码特点,给出了通过DVB-T系统传输几种不同医学图像的方法,通过微波矢量信号发生器验证的系统的正确性。论文工作对于建立基于软件无线电平台DVB-T廉价系统,以及尝试DVB-T在医学中应用,如传输医学图像和其他生理信号数据,具有一定的实用价值。
[Abstract]:DVB-T is the most widely used digital terrestrial television broadcasting system in the world. It is developed by European Digital Radio Television Group. The system provides a combination of various parameters and can be adapted to the transmission of video images in Gao Si channel and various multipath channels. It has strong anti-jamming and anti-distortion capability. This paper mainly discusses the principle and key technology of OFDM modulation in DVB-T system, and makes a deep research and exploration on DVB-T channel coding. The main contents of this paper are as follows: the working principle and realization method of OFDM modulation are described in detail, and the key technologies of OFDM modulation and their functions in signal transmission process, such as pilot technology, are introduced. A new timing synchronization method with low implementation complexity and no extra bandwidth is proposed for cyclic prefix and synchronization. This paper mainly introduces the structure of OFDM frame in DVB-T system and the principle of each function module of channel coding, and gives the realization of each module. These modules mainly include: energy dispersing RS coding, convolution interleaving, convolution coding, symbol interleaving, and so on. Bit Interleaver, Constellation Mapping, reference signal and OFDM Modulation. The main C function functions and key parameters of these modules are listed. The interface of each module function is unified to realize the generation of digital baseband data. According to the need of emergency communication in medical system, combined with the transmission background and coding characteristics of medical image, this paper presents several methods of transmitting different medical images through DVB-T system, and verifies the correctness of the system by microwave vector signal generator. The work of this paper is of practical value for the establishment of DVB-T cheap system based on software radio platform and the attempt of DVB-T application in medicine, such as the transmission of medical images and other physiological signal data.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN919.8;TN929.53;TN949.1
本文编号：2234660
[Abstract]:DVB-T is the most widely used digital terrestrial television broadcasting system in the world. It is developed by European Digital Radio Television Group. The system provides a combination of various parameters and can be adapted to the transmission of video images in Gao Si channel and various multipath channels. It has strong anti-jamming and anti-distortion capability. This paper mainly discusses the principle and key technology of OFDM modulation in DVB-T system, and makes a deep research and exploration on DVB-T channel coding. The main contents of this paper are as follows: the working principle and realization method of OFDM modulation are described in detail, and the key technologies of OFDM modulation and their functions in signal transmission process, such as pilot technology, are introduced. A new timing synchronization method with low implementation complexity and no extra bandwidth is proposed for cyclic prefix and synchronization. This paper mainly introduces the structure of OFDM frame in DVB-T system and the principle of each function module of channel coding, and gives the realization of each module. These modules mainly include: energy dispersing RS coding, convolution interleaving, convolution coding, symbol interleaving, and so on. Bit Interleaver, Constellation Mapping, reference signal and OFDM Modulation. The main C function functions and key parameters of these modules are listed. The interface of each module function is unified to realize the generation of digital baseband data. According to the need of emergency communication in medical system, combined with the transmission background and coding characteristics of medical image, this paper presents several methods of transmitting different medical images through DVB-T system, and verifies the correctness of the system by microwave vector signal generator. The work of this paper is of practical value for the establishment of DVB-T cheap system based on software radio platform and the attempt of DVB-T application in medicine, such as the transmission of medical images and other physiological signal data.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN919.8;TN929.53;TN949.1
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