DMR系统转发技术研究及中转台硬件设计与开发

发布时间：2018-10-25 11:48

【摘要】：专用无线通信系统具有公用无线通信系统所没有的优点,如呼叫接续快、支持一对多的通信等,特别适合部门调度等众多场合。近年来,随着通信技术的快速发展,专用无线通信也得到了迅速的发展。数字专用无线系统由于具有频谱利用率高、抗干扰性能强、能提供数据应用功能等优点,将逐步取代模拟专用无线系统。目前,世界上推出了多个数字专用无线通信标准,DMR(Digital Mobile Radio)标准是由欧洲电信标准协会(ETSI)提出的一种新型的全球开放性的数字专用无线电标准,具有开放程度高,成本低等优势,在专用无线通信领域受到了广泛的关注。本文主要研究的是DMR系统的转发技术及中转台硬件的设计和开发。文中首先介绍了专用无线通信的背景和发展现状,接下来对DMR的帧结构和转发模式进行介绍,然后介绍了无线传播环境的特性和传播模型,借助常用无线通信系统的覆盖方案对DMR中转台的覆盖问题进行分析并举例说明。其次,本文提出中转台硬件实验平台的设计方案,对方案的可行性进行论述,之后对方案中的转发板硬件电路进行设计,详细说明了它的各接口电路,并对转发板的PCB制作过程进行介绍。最后,本文对转发板的部分硬件电路的调试过程进行说明,接下来介绍了中转台的通道程序的编写和调试过程,然后搭建中转台基带实验平台,并在此实验平台上进行了中转台基带转发实验,对基带转发的误码测试和语音测试过程进行了介绍,对实验结果进行了分析。本文在结尾介绍了作者在基于SB3500的DMR数字对讲机端机开发项目中的工作,主要是对基带模块和射频模块的整机调试进行了说明。
[Abstract]:The private wireless communication system has the advantages that the public wireless communication system does not, such as fast call connection, support for one-to-many communications, especially suitable for department scheduling and many other occasions. In recent years, with the rapid development of communication technology, private wireless communication has also been rapidly developed. Digital dedicated wireless system will gradually replace the analog special wireless system because of its advantages such as high spectrum efficiency, strong anti-jamming performance and the ability to provide data application functions. At present, many digital private wireless communication standards (, DMR (Digital Mobile Radio) have been introduced in the world, which is a new type of global open digital private radio standard proposed by European Telecommunication Standards Association (ETSI). It has the advantages of high openness and low cost. In the field of private wireless communication has received extensive attention. This paper mainly studies the forwarding technology of DMR system and the design and development of transponder hardware. This paper first introduces the background and development of private wireless communication, then introduces the frame structure and forwarding mode of DMR, and then introduces the characteristics and propagation model of wireless communication environment. The coverage problem of DMR transponder is analyzed by means of the coverage scheme of common wireless communication system and an example is given. Secondly, this paper puts forward the design scheme of the hardware experimental platform of the transfer table, discusses the feasibility of the scheme, then designs the hardware circuit of the forwarding board in the scheme, and explains the interface circuits in detail. The PCB manufacturing process of the forwarding board is also introduced. Finally, this paper explains the debugging process of part of the hardware circuit of the forwarding board, and then introduces the process of compiling and debugging the channel program of the transponder, and then builds the baseband experimental platform of the transponder. On this experimental platform, the baseband forwarding experiment of the transfer station is carried out, and the error code test and the speech test process of the baseband forwarding are introduced, and the experimental results are analyzed. At the end of this paper, the author's work in the development project of DMR digital interphone terminal based on SB3500 is introduced. The debugging of baseband module and RF module is mainly explained.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92

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