应用于有线局域网中的无线光接收器

Wireless optical receivers for wire local area networks

为了获得无线上网,免去PC机之间繁琐的导线连接.可采用遵守无线局域网协议的无线网卡和微波收发器.但现有大多数PC机配置的是有线局域网网卡,这里利用现有的有线网网卡,和无线红外光传输方式同样实现了PC机在有线局域网中的无线上网,而且较之微波方式,具有免电磁干扰、免频率使用申请、价格便宜、安全性高等优点.在室内漫反射的无线红外光作为信息载体,使用大面积PIN探测器和高灵敏度接收电路制作的无线光接收器,和已有的有线局域网中的10M网卡,能够获得10M传输速度的无线上网,同时接收器具有一定的漫游性,可以在室内进行移动通信.文中分析无线光接收器的灵敏度和带宽,并给出利用该接收器无线上网后的实验结果.

To achieve the wireless network link for personal computers without fussy wires, wireless network cards and microwave transceivers which obeying the protocol of wireless local area network are usually utilized However, most of personal computers have been collocated with wire local area network cards. Herein the wire network card and wireless infrared optical transmitting method are employed to obtain wireless network link. Compared with the microwave, the infrared has several advantages including the immunity to radio interference, without spectrum application, low cost and safety. In our system, the signal is carried by the diffuse infrared light in the room. The wireless receiver consists of the large-area PIN detector with high sensitivity and 10 M wire network card. It directly connects the network card of the wired local area network with the communication speed of 10 Mbps. Due to the roam character of the receiver, it can realize mobile communications. The sensitivity, bandwith, and experimental results are analyzed and presented.