【 Weak current College 】 wireless technology "WiMAX"?

Maximum transmission speed 75Mbit/seconds, the maximum transmission distance of up to 50km & high speed for long distance transmission of wireless communication technology "WiMAX" in the United States redoubled, much better than wireless LAN.

This technique is what will be applied in the fields of application will be how to? WiMAX Vision uses completely different with the wireless LAN. Wireless LANs are generally applied to a hundred meters of distance communication, namely, "LAN". While WiMAX is several kilometres to dozens of kilometers of wide application.

WiMAX standard based on the IEEE802.16. Generally can be divided into 2 types of IEEE802.16-2004 June this year to develop standards for basic IEEE802.16a. Envisaged maximum transmission distance of 7km ~ 10km fixed region. Another is being developed in IEEE802.16e, mobile terminal, the maximum transmission distance of 3km ~ 5km. Currently, there is a particular concern is the specification determined by 802.16-2004. It is expected that the first half of 2005, there will be a related product, it is used primarily to connect to the Internet service access lines. The alternative of using a telephone line, ADSL and so will the communication operators and users.

WiMAX in the United States's award-winning attention largely depends on the situation of the United States. Vast United States, even if you use a phone line or ADSL signal is transmitted to the distant suburban housing. This is also the hopes of WiMAX. WiMAX adoption and wireless LAN standard 802 .11A and 11g same OFDM modulation (OrthogonalFrequencyDivisionMultiplexing). The bandwidth of each channel to 20MHz. This also and 11a and 11 g is almost the same. But because you can outdoor fixed antenna and receiving radio waves in a stable way, so the radio waves can host the number of bits of higher than 11a and 11 g. Therefore, you can achieve 74.81Mbit/s maximum transfer rate. In addition, by location, very high the antenna transmitting power strong signal, and long-distance communication possible. WiMAX standards using 2G ~ 11GHz within a band. In the United States and Europe, plans assigned to WiMAX relative idle 2.5GHz, 3.5GHz and 5.8GHz band.