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在今天的许多工作环境中(如医院、工厂和仓库等)一般不希望在计算之机间采用硬线连接,因为这种连接的价格过于昂贵,使用也极不方便。在这种情况下通常采用无线LAN终端,因为它比硬线连接价廉物美。 无线LAN或无线局域网终端是指在两台计算机之间能在相当短的距离内进行通信。为此,需要把无线LAN终端装到两台计算机的终端上。无线LAN可以是红外型的,也可以是射频型的,这里只讨论射频型无线局域网。 应该注意的是,这种电路与其它类型通信所采用的电路非常类似,例如美国数字蜂窝标准IS54和近轨(LEO)卫星终端。下面给出的信号链路图包括接收通道和发射通道两部分。
In many working environments today, such as hospitals, factories and warehouses, hardwired connections are generally not desirable between computing machines, as the connection is too expensive and inconvenient to use. In this case, the wireless LAN terminal is usually adopted because it is less expensive than the hardwire connection. A wireless LAN or wireless LAN terminal means that communication can be made within a relatively short distance between two computers. To do this, you need to install the wireless LAN terminal on two computer terminals. Wireless LAN can be infrared type, it can also be of the RF type, here only discusses the RF wireless LAN. It should be noted that this circuit is very similar to the circuits used in other types of communications, such as the U.S. Digital Cellular standard IS54 and Near-Earth (LEO) satellite terminals. The signal chain diagram given below consists of the receive channel and the transmit channel.