数字对讲机测试仪器与对讲机之间通信技术的研究

发布时间：2018-01-11 02:00

本文关键词：数字对讲机测试仪器与对讲机之间通信技术的研究　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

更多相关文章： DPMR DMR PDT 呼叫控制层 测试仪器

【摘要】：专网移动通信是通信系统一个重要分支,而无线对讲机则是专网移动通信中使用的最基本的设备,具有通信建立快、一呼百应的特点,与手机等公用移动通信有着不同的市场定位,主要侧重于指挥、联络、调度,被广泛用于交通,运输,消防,安保以及重大事件与突发事件应对等,在国民经济生活中具有重要作用。随着对讲机用户数量的不断增加及用户需求的不断多样化,传统的模拟对讲机频带利用率较低、互相干扰较严重、业务功能较单一等问题日益突出。与传统模拟对讲机相比,数字对讲机具有抗干扰能力强,频带利用率高,保密性好等特点。对讲机的数字化正成为未来对讲机发展的趋势,ESTI提出了DPMR和DMR两套数字对讲机标准,目前这两套标准已成为国际数字对讲机标准。无疑,数字对讲机是大趋势,我国现在正处于从模拟对讲机向数字对讲机过渡时期,我国公安部信息通信局也提出了PDT数字对讲机标准。正是基于上述大环境,本课题旨在通过对DMR、DPMR以及PDT这三种通信协议的研究,设计一个数字对讲机测试仪器通过眼图和星座图等来对数字对讲机的信号和时隙功率、信号频率误差、符号定时误差、幅度误差、FSK误差、占有带宽、误码率、符号偏离及其控制寄存器等参数指标进行测试。尽可能多的找出对讲机的设计错误,在保证性能的同时提高产品自身的设计开发能力,以及给用户提供具有可信度的产品,需要对数字对讲机进行测试来保证产品质量。为了更好地测试对讲机,我们首先要对对讲机的协议熟练掌握。本文的主要工作是研究DMR、DPMR以及PDT这三种通信协议标准,尤其是第三层呼叫控制层的设计过程,以及数字对讲机测试仪器与对讲机仪器之间的通信的实现方法。首先,对DMR、DPMR以及PDT这三种协议进行深入研究,主要研究各协议的各分层结构的主要功能,详细分析了物理层和数据链路层中的关键技术。其次,分别着重对DPMR和DMR两种采用不同的多址方式的协议的呼叫控制层进行研究,详细介绍各信令的组成以及功能,并对不同业务的过程进行研究与实现,尤其是对语音单呼和组呼这两种业务的实现。再次,对测试仪器的硬件平台以及软件平台进行介绍,在FPGA中验证DMR数字对讲机测试信号形成及接收信号的方法。
[Abstract]:The special network mobile communication is an important branch of the communication system, and the wireless interphone is the most basic equipment used in the private network mobile communication. With mobile phone and other public mobile communications have different market positioning, mainly focusing on command, liaison, scheduling, is widely used in traffic, transport, fire, security and major incidents and emergency response. It plays an important role in the national economy. With the increasing number of interphone users and the diversification of users' needs, the traditional analog radio frequency band utilization rate is low, and the interference between each other is serious. Compared with traditional analog walkie-talkies, digital interphone has strong anti-interference ability and high frequency band utilization. The digitalization of interphone is becoming the trend of the development of interphone in the future. Esti has put forward two sets of digital interphone standards: DPMR and DMR. At present, these two sets of standards have become the international standard of digital interphone. Undoubtedly, digital interphone is a big trend, and our country is now in the transition period from analog interphone to digital interphone. The information communication bureau of the Ministry of Public Security of our country has also put forward the standard of PDT digital interphone. It is based on the above environment, this subject aims to research three kinds of communication protocols: DMR-DPMR and PDT. A digital walkie-talkie test instrument is designed to measure the signal and slot power, signal frequency error, symbol timing error, amplitude error and FSK error of the digital interphone through eye diagram and constellation diagram. Error rate, symbol deviation and control register and other parameters are tested. As many as possible to find out the interphone design errors, while ensuring the performance of the design and development of the product itself. And to provide users with reliable products, we need to test the digital interphone to ensure the quality of the product. In order to better test the interphone. First of all, we should master the protocol of interphone. The main work of this paper is to study three kinds of communication protocol standards, DMR-DPMR and PDT, especially the design process of the third layer call control layer. And the realization method of communication between the digital interphone test instrument and the interphone instrument. Firstly, the three protocols of DMR-DPMR and PDT are deeply studied. This paper mainly studies the main functions of each layer structure of each protocol, and analyzes the key technologies in the physical layer and the data link layer in detail. Secondly, the key technologies in the physical layer and the data link layer are analyzed in detail. This paper focuses on the research of call control layer of DPMR and DMR which adopt different multiple access protocols, introduces the composition and function of each signaling in detail, and studies and implements the process of different services. Especially the realization of voice single call and group call. Thirdly, the hardware platform and software platform of the test instrument are introduced. The method to verify the formation and reception of DMR digital interphone test signal in FPGA.
【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】：TN929.5

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