DMR数字对讲机基带信号的研究与分析

发布时间：2018-06-09 23:41

本文选题：数字移动无线电 + 信道编码　；参考：《合肥工业大学》2014年硕士论文

【摘要】：对讲机通信作为移动通信中的重要分支,在人们的日常生活中发挥了很大作用。由于模拟对讲机的劣势逐渐显现,模拟对讲机的改进和升级,不仅有利于人们使用,而且对专用无线通信的发展有着深远的影响。随着国内对讲机由模拟化向数字化的转变,人们对数字对讲机的研究产生了很大兴趣。本文对欧洲电信标准协会提出的数字移动无线电(Digital Mobile Radio, DMR)标准进行研究,该标准具有产品成本低、技术简单,并且支持从模拟向数字过渡等特点。文中首先介绍了DMR标准的分层结构、数据帧和语音帧的组成结构以及DMR标准中不同位置所包含信息的功能；其次,介绍了DMR标准中使用的汉明码、QR码及Golay码等各种编码,重点分析了QR(16,7,6)码性能及其编解码过程,给出了一种改进的捕获解码法实现QR(16,7,6)码的解码；然后,对DMR协议的基带信号处理过程进行研究,重点介绍了发送端成形滤波器的设计和接收端抽样判决过程的实现,通过MATLAB工具讨论了不同阶数和窗函数的成形滤波器的滤波效果,实现了发送端及接收端基带信号处理流程算法,并在MATLAB环境下和基于TMS320VC5502平台的CCS环境下给出了算法仿真图；最后,对TMS320VC5502输出的数字基带信号的数模转换进行分析,介绍了PWM信号的使用,并给出了通过使用PIC24FJ64GB004微控制器的PWM功能和低通滤波器实现基带数字信号数模转换的方法。
[Abstract]:As an important branch of mobile communication, interphone communication plays a great role in people's daily life. As the disadvantage of analog interphone gradually appears, the improvement and upgrading of simulated interphone is not only beneficial to people, but also has a profound influence on the development of special wireless communication. To the digital transformation, people have made great interest in the research of digital interphone. This paper studies the Digital Mobile Radio (DMR) standard proposed by the European Telecommunications Standards Association. This standard has the characteristics of low product cost, simple technology and support from analog to digital transition. In this paper, DM is introduced in this paper. The hierarchical structure of R standard, the structure of data frame and voice frame and the function of information contained in different positions in DMR standard. Secondly, it introduces various codes, such as Hamming code, QR code and Golay code used in the DMR standard, analyzes the performance of QR (16,7,6) code and its coding process, and gives an improved capture decoding method to implement QR (16,7,6) code. 16,7,6) decoding of the code; then, the process of the baseband signal processing of the DMR protocol is studied. The design of the sending end forming filter and the implementation of the sampling decision process are introduced. The filtering effect of the forming filter with different order and window function is discussed by the MATLAB tool, and the sending end and the reception terminal base band signal are realized. In the MATLAB environment and the CCS environment based on the TMS320VC5502 platform, the algorithm simulation diagram is given. Finally, the digital analog conversion of the digital baseband signal of the TMS320VC5502 output is analyzed, the use of the PWM signal is introduced, and the implementation of the PWM function and the low pass filter by using the PIC24FJ64GB004 micro controller is also given. A method of digital analog conversion for baseband digital signal.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.54

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