近年來，多種無線通訊技術已被廣泛部署以增強行動通訊。從最初的第一代行動通訊到第五代行動通訊，無線通訊不斷地進步。這些技術的發展正在改變這個社會。通過這些創新與應用，它將改變我們的生活型態。一般而言，我們在生活中常見的無線通訊就是手機和基地台之間的信息傳輸。數位行動無線電DMR (Digital Mobile Radio)，由歐洲電信標準協會ETSI (European Telecommunications Standards Institute)制定的一種數位行動無線電標準。基於安全與保密的原因，無線電訊號通常在傳輸之前進行加密。訊號附加的信息可能包含有「訊號的調變方式、無線電設備ID號碼、聲音以及傳送時間」等資訊。本研究試圖分析台灣警察和消防部門使用的DMR系統。目前，有許多解決方案來接收和解碼數位無線電通訊系統。為了解決系統整合上的問題，本研究利用名為GNU Radio的SDR (Software Defined Radio)開發平台和大量所需的通訊模塊，設計了Linux操作系統下的DMR接收系統。本論文的主要目標是解碼DMR系統中的無線電設備ID號碼。獲得對講機ID後，可通過軟體開發輕鬆設計其它增值應用。

In recent years, several kinds of wireless communication technology have been widely deployed to enhance mobile communication. From the first generation of mobile communication to the fifth generation of mobile communication, wireless communication technology is constantly improving. The development of these technologies is changing the society. Through these innovations and applications, our daily life will be changed. In general, the common wireless communication in our life is the information transmission between mobile phones and base stations. A typical digital communication system called DMR (Digital Mobile Radio) is a digital mobile radio standard developed by ETSI (European Telecommunications Standards Institute). For security and confidentiality reasons, radio signals are usually encrypted before being transmitted. The information attached to the signal may include information such as "the modulation method of the signal, the ID number of the radio equipment, the sound and the transmission time". This study attempts to analysis the DMR system used by police and firefighter sectors in Taiwan. At present, there are many solutions to receive and decode digital radio communication systems. In order to solve the problem of system integration, this research uses the SDR (software-defined radio) development platform, named GNU Radio, and a lot of required communication modules to design a DMR receiving system under Linux operating system. The main goal of this thesis is to decode the radio equipment ID number in the DMR system. After obtaining the radio ID, other value-added applications can be easily designed via software development.

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