
Broadband Wireless Access (BWA) standard that is currently widely used is the standard issued by the Institute of Electrical and Electronics Engineering (IEEE). One product is the IEEE 802.16 standard to be used as yangdirancang water interface for fixed broadband access system or known as the IEEE Wireless Metropolitan Access Network (Wireless MAN) air interface. In further developments the IEEE 802.16 standard was developed into several variants of each variant has the advantage of each of its use or certain conditions. Several variants of the IEEE 802.16 standard is 802.16a, 802.16rev.d, and 802.16e for mobile communications. Development is done by a joint forum consisting of the entire world and called the WiMAX Forum. IEEE 802.16 standard wireless technology which is intended to change quickly Broadband Wireless Access industries. BWA technology can provide many advantages compared to using the cable network. Benefits include menggunakam BWA services more quickly, can easily be applied in areas difficult to reach the wired infrastructure, reducing installation costs and maintenance, and have the physical capabilities of a traditional wired infrastructure.
Basic structure of WiMAX Network
In general, WiMAX systems are not much different from the WLAN. WiMAX system consists of Base Station (BS), Subscriber Station (SS) and a server behind such BS Network Management System (NMS) and the transport site to connect to the network. To Subscriber Station (SS) is located in the customer environment, while the Base Station (BS), NMS and transport sites are usually one location with a network operator. Part transport site can be a connection with an ATM-based IP networks or Ethernet. Interface from the SS to BS using the OFDM / Water Interface, from BS - Gateway and Gateway - Internet using 10/100 Base T or E1 and the Gateway - PSTN using E1. Base Station (BS) is a device transceiver (transmitter and receiver) that is usually installed one location (colocated) with internet protocol networks. From this BS will be connected to multiple CPE interfaces with the media of radio waves (RF) WiMAX standard. The antenna used in the BS 600 may be a sector, 900 or 1200 depending on the area to be served. Remote Stations or CPE consists of Outdor Unit (ODU) and an Indoor Unit (IDU), the radio device is a separate and there is integrated with the antenna.
wimax.jpg generic configuration
Standard WiMAX
Institute of Electrical and Electronic Engineering (IEEE) defines a standard WiMAX technology by 802.16. This standard in its development has several variants. Popular variants are:
• 802.16
WiMAX is the first standard by the IEEE dikeluakan, technically has special advantages compared with the product - BWA products that already exist. 802.16 is designed to for use of communication or Fixed Wireless Access (FWA)
• 802.16a Rev D
Issued as a revision of the existing 802.16. This variant has the additional capability has antenna diversity and sub-channelization, working at a lower frequency of 2-11 GHz, using Orthogonal Frequency Division Multiplexing (OFDM), are able to condition Non Line Of Sight (NLOS). This standard is also designed for the use of communication / FWA.
• 802.21e
Using Orthogonal Frequency Division Multiple Access (OFDMA) which allows access to more than one user at the same time. 802.16e standard is used for mobile communication that is also called Mobile WiMAX





