The Physical Layer Of Digital Trunking Handheld Software Development And Communication Protocols To Achieve

Trunking communication system is an advanced private/professional mobile communication system and public access mobile communication system. Based on digital mobile technology, the digital trunking communication system is of efficient frequency utility, much more system capability, security, various services and flexible network management. The digital trunking communication system is wildly used in a lot of fields, such as public security, field services, utilities, military, etc.. But the scale and technical level of our system wre worse than abroad. XXX system is the digital trunking communication system satisfied the requirements of public security department. The project this thesis involved is to research and develop the handset of XXX system.The main contents of this article can be divided into two parts:(1) The hardware structure of the handset is descripted, and the key technologies of hardware development are studied in detail.(2) The direct telecommunication mode in XXX system is investigated, and the implementation technology of this mode is discussed.In the first part of the thesis, the characteristics of digital trunking communication system and the background of this thesis are introduced. Secondly, OMAP5912 is studied in detail. In the third chapter, we compare two kinds of software defined radio architecture, then the hardware structure of the handset is described. The direct telecommunication mode in XXX system is investigated in the fourth chapter. Another part of this chapter is the description of a communication scene which we will achieve. In the fifth and sixth chapter, key technologies of hardware development and the direct telecommunication mode in XXX system are discussed in detail. In the last part of the sixth chapter, we describe the verification of the handset function.