計概報告家妃.Ppt

This document discusses wireless personal area networks (WPANs) and some common WPAN technologies used within short distances of less than 5 meters. It describes Bluetooth, which was originally proposed in 1998 for short-range wireless applications between devices like phones and cameras. Bluetooth uses frequency hopping spread spectrum in the 2.4 GHz band. ZigBee is also discussed as dealing with very low data rates but long battery life for applications like wireless sensor networks.