The Application Of Digital Communication To The Protable Terminal

With the development of the electronic technology and integrate circuit, the use of digital communication become wider and wider. However, the application of digital communication to the portable terminal of our army,is blank in communicate equipment of our army all along. The content of the discourse is pivotal technology of digital communication applying to the first portable terminal of our army, this production fill up blank in portable data communicate terminal of our army, and also the production is beared the palm of technology innovate of Tianjin .This portable terminal is a carry-home communication equipment of link up transmitter-receiver, its core part is dependable digital communication, so the core content in this paper is making use of digital communication technology achieving communication function of this terminal. This paper analyse digital MODEM scheme of the terminal, discourse upon working process of digital MODEM, and solve frequency jam of MODEM and the main system, and increase communication quality of this terminal.The discourse sum up error control system of digital communication, analyse error control coding, and expatiate achieve method on error control technology of the terminal. This paper discuss thoroughly error control coding of this terminal, and also lucubate arithmetic of Hagelbarger coding and CRC, and enhance availably data communication reliability. In addition, improve on data put right method and data synchronization system, so as to increase success proportion of data communication, and satisfy tactical using request of this terminal. Using a new RISC program langue─AVR C , achieve communication function of the terminal. Making use of some outstanding characteristic of RISC achieve communication software of the terminal.