数字对讲机测试技术及FPGA实现
发布时间：2018-10-09 16:29
【摘要】：数字对讲机取代模拟对讲机,并以其符合现有专用无线通信环境工作需要的多项功能广泛应用于单位的调度、指挥、组呼等方面,包括实现点对点或一点对多点的定向通信及完成短消息、文本信息与数据传输通信等功能。而对讲机行业各个环节的发展,包括研发、测试、生产等,均会对整个行业的发展产生举足轻重的作用。研究基于硬件的对讲机测试,有利于无线电相关业务的顺利进行,同时对于对讲机产品的研发技术、质量控制、大规模生产具有重大意义。本课题来源于基于DMR(Digital Private Mobile Radio)/DPMR(Digital Mobile Radio)/PDT(Police Digital Trunking)协议的数字对讲机测试系统设计。DMR系统协议是由欧洲电信标准协会(ETSI)制定的开放性的数字对讲机标准;DPMR是由ETSI制定的低成本数字对讲机标准;PDT是结合国家公安无线指挥调度实际通信需求推出的数字专业无线通信技术新标准。本论文在对讲机相关协议标准研究的基础上,掌握信号生成技术,运用FPGA硬件开发技能,研究一套基于FPGA的对讲机测试系统。本文所讲到的数字对讲机测试系统可分为低频板及编解码调制电路板(简称数字板)两大模块,低频板主要实现人机交互、A/D及D/A转换等功能,数字板的功能为按照协议规定进行测试系统数字信号处理的相关工作,包括编解码及调制解调等。本论文着重研究基于DPMR相关协议的数字对讲机测试系统的数字板部分的实现。本文首先介绍了DPMR系统协议,包括协议分层结构、帧结构、调制方式及各个帧的构造过程。其次,初步介绍了测试系统整体框架结构及信号生成技术。最后,文中描述了系统所涉及的接口设计,接口分为与低频板之间通信的外部接口及数字板自身的内部接口两大类,外部接口包括指令解析、双向口、A/D及D/A接口,内部接口主要为FIFO及双口RAM。接口部分的合理高效设计及实现是各功能模块正确有序工作的前提条件,根据相关标准及项目实际需要,文中提出了数字板系统工作的整个流程,研究了各接口在本设计中的工作时序,同时给出了Verilog HDL设计关键语句、原理框图及基于Modelsim的仿真结果。本设计基于Altera公司的FPGA进行板级验证及调试,通过Quartus II开发环境的SignalTap来观察结果,目前该系统已初步完成板级验证及联调工作。文中详细介绍了从部分到整体联调的整个过程,并给出了实现结果,同时阐释了将SignalTap所得数据提取出来在Matlab中进行仿真的情况。由于三种协议在很大程度上具有互联互通性,因此,文中所研究的成果为本项目的DMR及PDT测试系统的实现奠定了基础。
[Abstract]:Digital walkie-talkies replace analog walkie-talkies, and they are widely used in scheduling, command, group calling and other aspects of units, with many functions that meet the needs of the existing dedicated wireless communication environment. It includes the realization of point-to-point or point-to-multipoint directional communication, the completion of short message, the communication between text information and data transmission, and so on. The development of interphone industry, including R & D, testing and production, will play an important role in the development of the whole industry. The study of hardware based interphone testing is beneficial to the smooth progress of radio related services, and is of great significance to the R & D technology, quality control and mass production of interphone products. This topic comes from the design of digital walkie-talkie testing system based on DMR (Digital Private Mobile Radio) / DPMR (Digital Mobile Radio) / PDT (Police Digital Trunking) protocol. DMR system protocol is an open digital interphone standard developed by (ETSI) of European Telecommunication Standards Association. DPMR is a low-cost digital interphone standard developed by ETSI. Digital Interphone Standard (PDT) is a new standard of digital professional wireless communication technology, which is based on the actual communication requirement of national police wireless command and dispatch. Based on the research of interphone protocol standard, this paper grasps the signal generation technology, uses FPGA hardware development skill, studies a set of interphone testing system based on FPGA. The digital interphone testing system mentioned in this paper can be divided into two modules: low frequency board and codec modulation circuit board. The low frequency board mainly realizes the functions of man-machine interaction, such as A / D and D / A conversion. The function of digital board is to deal with digital signal of test system according to protocol, including coding and decoding, modulation and demodulation, etc. This paper focuses on the implementation of digital interphone testing system based on DPMR protocol. This paper first introduces the DPMR system protocol, including the protocol hierarchical structure, frame structure, modulation mode and the construction process of each frame. Secondly, the whole frame structure and signal generation technology of the test system are introduced. Finally, the interface design involved in the system is described. The interface is divided into two categories: the external interface which communicates with the low frequency board and the internal interface of the digital board itself. The external interface includes instruction parsing, bidirectional interface A / D and D / A interface. The internal interface is mainly FIFO and dual-port RAM.. The reasonable and efficient design and realization of the interface part is the precondition for each functional module to work correctly and orderly. According to the relevant standards and the actual needs of the project, the whole process of the work of the digital board system is put forward in this paper. The working sequence of each interface in this design is studied, and the key sentences, schematic block diagrams and simulation results based on Modelsim are given. This design is based on the FPGA of Altera Company for board level verification and debugging. The results are observed by SignalTap in the Quartus II development environment. At present, the system has preliminarily completed the board level verification and joint adjustment work. In this paper, the whole process from part to whole is introduced in detail, and the implementation results are given, and the simulation of extracting the data from SignalTap in Matlab is explained at the same time. Because the three protocols are interconnected to a large extent, the research results in this paper have laid a foundation for the implementation of the DMR and PDT test systems in this project.
【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
本文编号：2259997
[Abstract]:Digital walkie-talkies replace analog walkie-talkies, and they are widely used in scheduling, command, group calling and other aspects of units, with many functions that meet the needs of the existing dedicated wireless communication environment. It includes the realization of point-to-point or point-to-multipoint directional communication, the completion of short message, the communication between text information and data transmission, and so on. The development of interphone industry, including R & D, testing and production, will play an important role in the development of the whole industry. The study of hardware based interphone testing is beneficial to the smooth progress of radio related services, and is of great significance to the R & D technology, quality control and mass production of interphone products. This topic comes from the design of digital walkie-talkie testing system based on DMR (Digital Private Mobile Radio) / DPMR (Digital Mobile Radio) / PDT (Police Digital Trunking) protocol. DMR system protocol is an open digital interphone standard developed by (ETSI) of European Telecommunication Standards Association. DPMR is a low-cost digital interphone standard developed by ETSI. Digital Interphone Standard (PDT) is a new standard of digital professional wireless communication technology, which is based on the actual communication requirement of national police wireless command and dispatch. Based on the research of interphone protocol standard, this paper grasps the signal generation technology, uses FPGA hardware development skill, studies a set of interphone testing system based on FPGA. The digital interphone testing system mentioned in this paper can be divided into two modules: low frequency board and codec modulation circuit board. The low frequency board mainly realizes the functions of man-machine interaction, such as A / D and D / A conversion. The function of digital board is to deal with digital signal of test system according to protocol, including coding and decoding, modulation and demodulation, etc. This paper focuses on the implementation of digital interphone testing system based on DPMR protocol. This paper first introduces the DPMR system protocol, including the protocol hierarchical structure, frame structure, modulation mode and the construction process of each frame. Secondly, the whole frame structure and signal generation technology of the test system are introduced. Finally, the interface design involved in the system is described. The interface is divided into two categories: the external interface which communicates with the low frequency board and the internal interface of the digital board itself. The external interface includes instruction parsing, bidirectional interface A / D and D / A interface. The internal interface is mainly FIFO and dual-port RAM.. The reasonable and efficient design and realization of the interface part is the precondition for each functional module to work correctly and orderly. According to the relevant standards and the actual needs of the project, the whole process of the work of the digital board system is put forward in this paper. The working sequence of each interface in this design is studied, and the key sentences, schematic block diagrams and simulation results based on Modelsim are given. This design is based on the FPGA of Altera Company for board level verification and debugging. The results are observed by SignalTap in the Quartus II development environment. At present, the system has preliminarily completed the board level verification and joint adjustment work. In this paper, the whole process from part to whole is introduced in detail, and the implementation results are given, and the simulation of extracting the data from SignalTap in Matlab is explained at the same time. Because the three protocols are interconnected to a large extent, the research results in this paper have laid a foundation for the implementation of the DMR and PDT test systems in this project.
【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
【参考文献】
相关硕士学位论文 前2条
1 薛鸿媛;数字无中心系统数据链路层的研究与应用[D];北京化工大学;2009年
2 樊磊;DPMR数字对讲机射频一致性指标测试研究及自动化测试系统开发[D];北京邮电大学;2013年
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