嵌入式无线网关的实现

近年来,嵌入式微处理器的性能得到了很大提高,基于嵌入式系统的无线通信模块能够较好地满足人们对于无线通信和无线上网的要求。嵌入式系统整合WLAN实现无线通信已经成为研究和应用的热点。文章在嵌入式Linux下实现了对无线网卡和CDMA 1X modem的支持,使其能够同时连通ad hoc局域网和Internet,实现了系统的防火墙和IP转发功能,完成了无线网关的设计。文章对网关的硬件系统结构、软件实现过程分别做了叙述,并给出了实验室测试结果,该网关能较好地实现内部ad hoc局域网和Internet的桥接,达到了预期的目的。

Realization of embedded wireless gateway

In recent years,the performance of embedded microprocessor has been greatly enhanced.The realization of WLAN based on embedded system has become a hot spot of research and application.This article describes the design of wireless network card and CDMA 1X modem under embedded Linux.Based on it,the access with AD HOC LAN and Internet has been set up,the functions of Firewall and IP masquerading has been realized.The paper discussed hardware system configuration and software programming process about gateway,and brought forward laboratory testing result,the gateway can realize wireless bridging to the AD HOC and Internet.