DMR数字对讲机测试技术的研究与实现

发布时间：2019-06-11 03:17

【摘要】：近年来,随着无线通信技术的不断革新以及对讲机在行业中应用的逐步深入,用户对于无线对讲机的需求迅速攀升。在铁路运输、船舶通信、建筑公司、娱乐场所、物流运输以及公安系统等众多通信专用领域,对讲机发挥的作用越来越大,因此对讲机的研究变得日益重要。随着对讲机的使用率逐步提升,有限的频率资源已无法满足日益增长的广播和专用无线用户需求。传统的模拟通信对讲机对频谱的利用效率低,并且模拟对讲机的功能和使用范围变得越来越受限制,因此随着无线通信系统的飞速发展,数字对讲机的使用范围和作用越来越受到人们的重视。对讲机通信正逐步经历由模拟对讲机通信向数字对讲机通信的转变。由欧洲电信标准协会发布的DMR协议是专业的数字移动通信标准。该协议能很高效的利用频谱资源并且还可以兼容模拟常规。其业务功能丰富,可以扩展也可以向后兼容。同时,系统和终端以及总体运营维修的成本较低,网络建设速度较快。随着数字对讲机研究的迅速发展,数字对讲机的测试也变的越来越重要。良好的测试技术能够保证数字对讲机的研发高效快速,能够能快的找到设计上的错误,给用户的产品提供保障,同时数字对讲机的质量也就有了很好的保障。这对数字对讲机的大规模生产有很重大的意义。因此本文重点研究了基于DMR协议的数字对讲机的测试,通过本文的研究希望能对DMR数字对讲机的发展和研究有更多的帮助。本文根据国内外DMR系统的数字对讲机的发展现状和发展趋势,对DMR系统的数字对讲机测试做了充分的研究。文章首先系统的介绍了DMR系统协议,包括协议的突发结构、时隙结构、帧结构、信令、以及信道的接入和帧同步等协议的关键部分。然后比较详细地分析了DMR系统数据链路层比较重要的语音帧和数据帧的组成和发送方式。文中重点介绍了DMR数字对讲机测试时所用的两大功能语音和数据。通过NIOS ii软件用C语言编程的方法具体的实现了DMR数字对讲机语音测试帧和数据测试帧以及对语音测试帧和数据测试帧的编解码。最后对生成的测试帧在以FPGA为核心的硬件电路板上进行了测试,并得出结论。通过测试帧的形成以及编码和解码为DMR数字对讲机的测试提供了有效的信号源,为进一步的测试DMR数字对讲机提供了有力的保障。
[Abstract]:In recent years, with the continuous innovation of wireless communication technology and the gradual deepening of the application of walkie-talkie in the industry, the demand for wireless walkie-talkie is rising rapidly. Interphone plays a more and more important role in many special communication fields, such as railway transportation, ship communication, construction company, entertainment place, logistics transportation and public security system, so the research of interphone is becoming more and more important. With the increasing utilization rate of intercom, the limited frequency resources can not meet the increasing demand of broadcast and dedicated wireless users. The traditional analog communication walkie-talkie has low efficiency in spectrum utilization, and the function and application range of analog interphone become more and more limited, so with the rapid development of wireless communication system, People pay more and more attention to the scope and function of digital intercom. Interphone communication is gradually undergoing the transformation from analog interphone communication to digital interphone communication. The DMR protocol issued by the European Telecommunications Standards Association is a professional digital mobile communication standard. The protocol can make use of spectrum resources efficiently and can also be compatible with simulation conventions. Its business functions are rich, can be extended or backward compatible. At the same time, the system and terminal as well as the overall operation and maintenance cost is low, the network construction speed is faster. With the rapid development of digital interphone research, the test of digital interphone is becoming more and more important. Good testing technology can ensure the research and development of digital walkie-talkie efficiently and quickly, can quickly find the design error, provide guarantee for users' products, and at the same time, the quality of digital interphone has a good guarantee. This is of great significance to the mass production of digital intercom. Therefore, this paper focuses on the test of digital interphone based on DMR protocol, and hopes to be more helpful to the development and research of DMR digital interphone. According to the development status and development trend of digital interphone in DMR system at home and abroad, the digital interphone test of DMR system is fully studied in this paper. Firstly, this paper systematically introduces the DMR system protocol, including the burst structure, slot structure, frame structure, signaling, channel access and frame synchronization protocols. Then the composition and transmission mode of speech frame and data frame in data link layer of DMR system are analyzed in detail. This paper focuses on the two functional voice and data used in the test of DMR digital intercom. The speech test frame and data test frame of DMR digital intercom and the coding and decoding of speech test frame and data test frame are realized by NIOS ii software programming in C language. Finally, the generated test frame is tested on the hardware circuit board with FPGA as the core, and the conclusion is drawn. Through the formation of test frame, coding and decoding, it provides an effective signal source for the test of DMR digital interphone, and provides a powerful guarantee for the further test of DMR digital intercom.
【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】：TN929.54

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