Mobile Internet (3)-WiFi

Wi-Fi is a short-distance wireless technology and a wireless LAN.
Fidelity, also known as the 802.11b standard, has a high transmission speed and can reach 11 Mbps. In addition, it has a long valid distance and is also compatible with various 802.11 DSSS devices. Currently, the most popular laptop technology-the cutting-edge technology-is based on this standard. IEEE ([American] Association of electronic and electrical engineers) 802.11b wireless network specification is a variant of the IEEE 802.11 Network specification, with a maximum bandwidth of 11 Mbps, in the case of weak signal or interference, the bandwidth can be adjusted to 5.5 Mbps, 2 Mbps, and 1 Mbps. The bandwidth is automatically adjusted to effectively ensure the stability and reliability of the network. Its main features are: fast speed and high reliability. in the open area, the communication distance can reach 305 meters. in the Closed Area, the communication distance is 76 meters to 122 meters, it facilitates the integration with existing wired Ethernet networks, reducing the cost of networking.

??? Wifi is widely used on handheld devices, and WiFi phones are part of it. The existing Wi-Fi Mobile Phone standard is IEEE802.11a/B/G/n. Because no licensed frequency band (ISM) is used, WiMAX, which requires a licensed frequency band, is easier for business application and deployment. WiFi mobile phones have extensive terminal support for consumer electronic products and have become the most important basic function of broadband data terminals (PCS). WiFi mobile phones have become the standard configuration of smart phones. Using MIMO multi-input, multi-output, smart antenna, and other technologies, Wi-Fi phones can provide higher bandwidth and signal coverage. Currently, 802.11n products on the market can reach 300 Mbit/s.