The Design And Realization Of TDD Digital Handset

Wireless handset, an important offset in mobile communication, is applied at large. Wireless handset would be used in the future because it differ with other wireless communication devices such as mobile telephone on market orientation and they can' t be substituted each other. TDD mode in wireless communication is firstly highly regarded in the world during constituting 3G standard, TDD standard is constituted in both CDMA and TDMA system. TDD technology is more and more regarded lately, but few of mobile communication systems based on TDD double mode are applied.The principle and characteristic of TDD double mode is analyzed in this thesis. TDD double mode has many advantages, such as less wireless resource to be occupied, supporting asymmetry services, lower cost equipment relatively, easier to be implemented, and so on. So that TDD technology can provide an economical resolvent for wireless communication systems. The TDD communication protocol and structure of the digital handset system is studied in this thesis, which is combined with the technologies of wireless communication, microcontroller and voice coding, etc. Then the element models such as microprocessor, voice processor and RF chip are chosen. Hardware of digital handset is designed according to its demand, and software of this system is designed then. In the end, program is downloaded to hardware, system is debugged and experimented, and the result of experimentation is analyzed. Experimentation proved that TDD digital handset is feasible in technology.The digital handset studied in this thesis can provide another resolvent based on TDD for the Trunked communication system and cordless phone system. Moreover, if taking low cost, low power as a starting point, the system, which function has been perfected, is wieldy, reliable, and has well performance enough to satisfy demand on daily telephone conversation, the system also may be generalized in more areas.