IEEE802.11b (Wi-Fi) uses the open 2.4GHz band, with physical modulation in the form of Direct Sequence Spread Spectrum (DSS) with Complementary Code Keying (CCK) coding, and a maximum data rate of 11Mbps, without linear propagation.

2. 802.11a

IEEE802.11a operates in the 5GHz U-NII band, thus avoiding the congested 2.4GHz band, and is therefore virtually interference-free relative to 802.11b. The physical layer rate can be up to 54Mbps, and the transport layer can be up to 25Mbps.

3. 802.11g

802.11g is a standard introduced by the IEEE in order to solve the problem of the interoperability between 802.11a and 802.11b, which is a continuation of 802.11b, and both of them are using the same 2.4GHz universal band, which has a high degree of interoperability, and it is favored as the next generation of WLAN standard. It is a continuation of 802.11b, which uses the same 2.4GHz general-purpose band and is highly interoperable.

The HomeRF wireless standard was developed by the HomeRF Working Group as an open industry standard designed to enable wireless communications between computers and other electronic devices within the home.

In addition to the IEEE, the European Telecommunications Standards Institute (ETSI) is also developing a wireless access standard for the European market called HiperLAN. There are four standards: HiperLAN1, HiperLAN2, HiperLink and Hiper?Access. HiperLink is used for indoor wireless backbone systems, HiperAccess is used for outdoor fixed access to wired communication facilities, and HiperLAN1 and HiperLAN2 are used for wireless LAN access. HiperLAN1 and HiperLAN2 are used for wireless LAN access.

"Bluetooth" is an open standard for short-range wireless communication technology. It is geared towards small-area connectivity between mobile devices and is essentially an alternative to cables. It's a great way to get the most out of your PC's operating system.