DPMR数字对讲机测试技术的研究与实现

发布时间：2018-04-24 08:15

本文选题：DPMR + CRC　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：DPMR(Digital Private Mobile Radio)系统协议是欧洲电信标准协会(ETSI)发布的最新的专业数字移动通信标准。作为新一代数字通信系统,DPMR支持多种业务,应用范围广泛,适用于商业、专业和公共安全用户。在数字对讲机的研究,生产,维护过程中,必须要对其进行相关测试以确保其性能的可靠性。欧美发达国家早已研究出基于DPMR协议的对讲机测试系统,但其价格较高而且在公共安全方面有一定限制。由于我国对专业数字移动通信测试的研究起步较晚,目前我国还没有与此相关的测试仪器。本课题正基于这样的大背景产生,希望通过对DPMR协议的研究实现基于该协议的无中心数字对讲机性能的测试。使其符合实际产品的开发要求并为今后无中心数字对讲机通信协议的改进和升级提供参考与指导。本文首先介绍了数字对讲机的前景分析以及国内外研究现状和DPMR协议的优势。其次,论文对DPMR协议的核心模块进行了论述,对数据链路层用到的各种帧结构和其功能的设定进行了详细论述,并对通信信令的格式以及其取值进行了说明。此外,还介绍了协议中的各种信道接入规则。再次,比较详细地分析了DPMR协议中用到的各种编码,比如CRC校验,汉明编码,交织和扰码。并且给出了逐一给出了算法的原理以及具体实现过程。还给出了DPMR协议中各种帧的具体实现方式。然后,论文又系统介绍了DPMR协议中调制解调所用到的FIR滤波器设计,并采用Matlab进行了仿真设计,又详细介绍了DPMR协议中的用到的4FSK调制解调技术,并给出了产生方式以及解调的办法。最后,论文给出了相关的硬件实现,具体介绍了采用NIOS搭建硬件平台的过程,并给出了基带信号的测试结果。文中重点论述了协议中各种帧的形成过程,详细论述了编解码中的各种关键技术的具体实现算法,以及调制解调中的滤波器设计和4FSK调制与解调算法,并搭建了硬件平台,在硬件平台上进行了相关测试,给出了测试结果。
[Abstract]:The DPMR(Digital Private Mobile RadioProtocol is the latest professional digital mobile communication standard issued by the European Telecommunication Standards Association. As a new generation digital communication system, DPMR supports a wide range of services and is suitable for commercial, professional and public security users. In the research, production and maintenance of digital interphone, it must be tested to ensure the reliability of its performance. Interphone testing system based on DPMR protocol has been developed in developed countries of Europe and America, but its price is high and there are some limitations in public safety. Due to the late start of the research on the professional digital mobile communication in China, there are no related testing instruments in China. This paper is based on this background and hopes to test the performance of the centerless digital walkie-talkie based on the DPMR protocol. It can meet the requirements of the actual product development and provide reference and guidance for the improvement and upgrading of the digital interphone communication protocol without center in the future. This paper first introduces the foreground analysis of digital interphone, the research status at home and abroad and the advantages of DPMR protocol. Secondly, the core module of DPMR protocol is discussed in this paper, the frame structure and function of data link layer are discussed in detail, and the format of communication signaling and its value are explained. In addition, various channel access rules in the protocol are also introduced. Thirdly, various kinds of codes used in DPMR protocol, such as CRC check, hamming coding, interleaving and scrambling, are analyzed in detail. The principle and realization process of the algorithm are given one by one. The implementation of various frames in DPMR protocol is also given. Then, the paper systematically introduces the design of FIR filter used in modulation and demodulation in DPMR protocol, and uses Matlab to carry on simulation design, and introduces the 4FSK modulation and demodulation technology used in DPMR protocol in detail. The generation method and demodulation method are also given. Finally, the paper gives the related hardware implementation, introduces the process of using NIOS to build the hardware platform, and gives the test results of baseband signal. This paper focuses on the formation process of various frames in the protocol, discusses in detail the realization algorithms of various key technologies in coding and decoding, the filter design and 4FSK modulation and demodulation algorithm in modulation and demodulation, and builds a hardware platform. The related tests are carried out on the hardware platform, and the test results are given.
【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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