无线电波传播基础

了解无线电波的相关基本概念，了解衰落特性， 掌握什么是多普勒频移

usb driver

在linux下的USB开发 源码 The universal serial bus (USB) is a connection between a host computer and a number of peripheral devices. It was originally created to replace a wide range of slow and different buses—the parallel, serial, and keyboard connections—with a single bus type that all devices could connect to.* USB has grown beyond these slow connections and now supports almost every type of device that can be connected to a PC. The latest revision of the USB specification added high-speed connections with a theoretical speed limit of 480 MBps.