基于嵌入式系统的数字扩频收发信机设计  

Design of Digital Spread-spectrum Transceiver Based on Embedded System

作　　者：龙光利[1] 

机构地区：[1]陕西理工学院,陕西汉中723003

出　　处：《现代电子技术》2009年第5期93-95,104,共4页Modern Electronics Technique

基　　金：陕西省教育厅科研基金资助项目基于嵌入式系统的扩频通信电台的研究(07JK205)

摘　　要：将扩频技术和嵌入式技术结合起来,设计了一种数字扩频收发信机,它是双通道的,每一个通道都包括硬件和软件两部分。硬件部分由语音编解码电路、嵌入式微处理器、电平转换电路、语音数据扩频解扩调制解调电路、锁存及控制信号产生电路、外部存储器和射频单元电路组成;软件部分由系统启动加载程序和收发机系统的主程序两部分组成。通过软件编程、调试、下载,硬件焊接连线,通电调试,发送通道实现了话音录入、扩频和BPSK调制、无线发送;接收通道实现了无线接收,BPSK解调、解扩和播放;两通道可同时进行;在无线传输时,最远传输距离可达1 km左右,表明达到了设计要求。A sort of ditigal spread - spectrum transceiver is designed, which is hand in hand between the spread - spectrum technique and embedded technique. It is two - channels,each channel includs two parts：hardware and software. Hardware circuit includs voice codec circuit,embedded microprocessor,voltage switching circuit,voice data spread-despread spectrum and modulation-demodulation circuit, lock packing and signal controled circuit, external storage and radio frequency unit. Software includs two program： starting-loadding system program and master program of transceiver. Behind programming software, debugging program,downloadding software, weldding and linking Hardware circuit, switching on electrify and debugging circuit, the transmitting channel may realize voice - loginning, speading - spectrum, BPSK modulation and wireless transmitting; the receiviing channel may realize wireless receiviing,BPSK demodulation, despeading- spectrum and voice - playing. The two channel may run at one time and the farthest transmission range may approve I km. The result shows that it achieves the expected criteria of design.

关 键 词：嵌入式系统 扩频 发射 接收 

分 类 号：TN702[电子电信—电路与系统]