WiMAX is a wireless digital communication system, implement the IEEE 802.16 standard. This leads to WiMAX Wireless Metropolitan Area Network (WMAN). Using WiMAX wireless broadband access (Broadband Wireless Access, BWA) up to 50 kilometers for fixed stations, and 5-15 km for mobile stations.
As a comparison, WLAN (WiFi) 802.11 standard to reach only about 30-100 meters.
WiMAX stands for Worldwide Interoperability for Microwave Access, or in the IEEE standard known as 802.16. WiMAX is going to mimic the workings of cellular phone to broadband Internet access.
Simply, how WiMAX is similar to WiFi. But WiMAX has a higher speed, wider coverage, and users who more. WiMAX also has the potential to overcome the problem of internet access in the villages, who do not have internet access because it is not affordable telephone cable.
WiMAX system consists of two parts,
* WiMAX tower, as well as the concept of cellular phone towers (or BTS), or AP on WiFi.A WiMAX tower tower can cover the coverage area of approximately 8.000 square kilometers.
* WiMAX receiver - receiver and antenna, a small box or PCMCIA card, or a system which is integrated into the laptop as WiFi at this time.
WiMAX tower directly connected to the internet with a high-bandwidth cable (such as the T3 line, or optical). It also can connect to the WiMAX tower next to the line-of-sight, microwave link.
The connection to the tower next to it is often called * with the term backhaul, is in such a way that it can cover the range up to rural areas.
There are two forms of the wave beam that WiMAX will be given to this,
* Non-Line-Of-Sight (NLOS), as well as WiFi, a small antenna of a laptop connected to a WiMAX tower. In this mode, WiMAX uses a lower frequency range which 2-11 GHz (like WiFi).
* Line-Of-Sight (LOS), a satellite dish antenna leads directly to a WiMAX tower. These transmissions use higher frequencies, with ranges reaching up to 66 GHz. At higher frequencies, lower interference and higher bandwidth.
The working principle similar to WiFi WiMAX. A computer with WiMAX facility will be able to receive from the sender station WiMAX.
The difference, WiFi till now capable of sending data of 54 Mbps in optimal conditions.Meanwhile, WiMax is designed capable of up to 70 Mbps.
Which became the focus of WiMAX is the problem of coverage area. This is the advantage of WiMAX. WiFi coverage is only about 100 feet (30 m), while WiMAX to cover the range up to 30 miles (50 km) with its wireless access. The increase was in line with the frequency range used and the sender's power (power of the transmitter).
IEEE 802.16 Specifications
* Range-30-mile (50-km) radius from base station
* Speed - 70 megabits per second
* Line-of-sight is not used between the user and base station
* Frequency Band - 2 to 11 GHz and 10 to 66 GHz (licensed and unlicensed bands)
* Defines both the MAC and PHY layers, and allow for multiple PHY-layer specification.
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