优秀毕业论文基于ARM的数字通信模块.doc

摘要纵观当代通信的发展趋势，数字通信成为引领通信变革的主潮流。这是在数字化浪潮的背景下，计算机技术的应用和信息技术的发展的结果。在数字通信之前，人们主要用的是模拟通信。模拟通信是使用连续信号来表示和传输信息的通信系统。例如传统的市话通信、长途通信都是模拟通信。而数字信号是一种离散的、脉冲有无的组合形式，是负载数字信息的信号。 短距离无线传输具有抗干扰性能强、可靠性高、安全性好、受地理条件限制少、安装灵活等优点，在许多领域有着广泛的应用前景低功耗、微型化是用户对当前无线通信产品尤其是便携产品的实际需求，短距离无线通信逐渐引起广泛关注。常见的短距离无线通信有基802．11的无线局域WLAN、蓝牙 (blueTooth)、HomeRF及欧洲的HiperLAN(高性能无线局域网)，但其硬件设计、接口方式、通信协嵌入式系统中并未得到广泛应用。采用无线发射芯片TRF4900组成的无线数字发射工作在欧洲868 MHz频带和北美915 MHzISM频带，FSK调制，发射功率7 dBm，电源电压2.2～3.6 V，通过串行接口连接到微控制器实现参数设置和发射控制射芯片TRF4900 Abstract In light of the tendency of contemporary communication， Digital communications become the main flow of communication change。This is in the context of the digital tidal wave, application of computer technology and information technology development results。In digital communications before the main use is to simulate communication。Simulation of the communication is to use a continuous signal to representation and transport information communication system。Such as the traditional local telephone communications, long distance communications are analog communication。The digital signal is a discrete, pulsed with or without the combination, the load signal digital information。 A short distance wireless transmission has strong anti-performance, high reliability, security, and geographic conditions, flexible installation, etc., in many areas have broad application. Low power consumption, micro is a user on the current wireless communication products particularly portable, short range wireless communication gradually. Common short-range wireless communication is based on the 802.11 of the wireless WLAN, Bluetooth (blueTooth), HomeRF and European HiperLAN (high performance radio LAN), but its hardware design, interfaces, communications co-embedded system had not been widely applied. The design is based on the background of digital communications through the ARM control, using radio transmitter chip TRF4900 wireless digital transmitter module composed. ARM (Advanced RISC Machines) is