一种简易单工无线传呼系统  

Summary Simplex Wireless Communication System

作　　者：孙恒青 刘昱[1] 罗兵[1] 王茜[1] 何明[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430079

出　　处：《现代电子技术》2009年第17期7-8,12,共3页Modern Electronics Technique

摘　　要：设计一个由发射机和接收机两个部分组成的简易单工无线传呼系统。发射机发送模拟、数字信号,接收机接收信息并完成响应。发射和接收天线都采用1 m长拉杆天线;35 MHz的载波信号通过锁相环(PLL)频率合成技术产生,频率稳定度高达10-5;接收部分的信号解调由收音芯片CXA1238完成,接收灵敏度高,输出信号失真小。对增加传输距离和降低波形失真进行了仔细的研究和实验,使这两项技术指标达到较高设计要求,音频输入和数据输入可自动转换,双行液晶显示,人机交互界面友好。Design of a simplex wireless communication system with a transmitter and a receiver is realized. The transmitter sends both analog and digital signals while the receiver executes corresponding response according to the received message with the telescopic antenna of length of 1 meter. The carrier wave with frequency of 35MHz,which has a stability of up to 10^-5 ,is synthesized with PLL. The demodulation of messages of the receiver is implemented with the adaption of CXA1238 ,which can achieve a high level of sensitivity and low distortion. Through the sufficient study and experiment on extending of the transmission distance and reducing the wave distortion,the design reached a high target on the two aspects. Audio signal and digital data input can transform automotive,and the display with LCD makes the system friendly to exchange command with human.

关 键 词：单工通信 编码/解码 调制/解调 锁相环 

分 类 号：TP872[自动化与计算机技术—检测技术与自动化装置]