Institute of Transportation, MOTC

     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.