Introduction
WiMAX technology has been approved by Bangladesh Government in last quater of 2008 in Bangladesh. Use of this technology has been increased through the passage of time. WiMAX combines the performance of Wi-Fi with the range and quality of service (QOS) of a carrier-grade cellular technology. WiMAX networks can be as small as single base stations with a few subscriber units, to much larger networks with thousands of users. 4G WiMAX gives us incredibly fast wireless access to the internet from four to ten times faster than 3G wireless. WiMAX technology will allow the subscribers to enjoy the amazing experience of high speed internet along with data, voice and video.There are few WiMAX service provider in Bangladesh, among them OLLO is newly came in market. In our report we focused on WiMAX technology based on the company OLLO’s various aspect of technological term.

About WiMAX
WiMAX, meaning Worldwide Interoperability for Microwave Access, is a telecommunications technology that provides wireless transmission of data using a variety of transmission modes, from point-to-multipoint links to portable and fully mobile internet access. The technology provides up to 10 Mbit/s broadband speeds without the need for cables. The technology is based on the IEEE 802.16 standard (also called Broadband Wireless Access). The WiMAX forum describes WiMAX as "a standards-based technology enabling the delivery of last mile wireless broadband access as an alternative to cable and DSL".

How WiMAX works
The working method of WiMAX is little bit different from Wi-Fi network, because Wi-Fi computer can be connected through LAN card, router, or hotspot, while the connectivity of WiMAX network constitutes of two parts. First of one is WiMAX Tower or booster which also known as WiMAX base station and another one is WiMAX Receiver which is called Customer Premise Equipment or CPE.
If we think about WiMAX network then we see that there is a similarity with cell phone. When a user send data from a subscriber device to a base station then that base station broadcast the wireless signal into channel which is called uplink and base station transmit the same which is called downlink. The base station of WiMAX has higher broadcasting power, antennas and enhanced additional algorithms. WiMAX technology serves the network through towers that enable communication access over many miles. The broadband service of WiMAX is available only those areas which are coverage by their network.
When signal transmit from user to WiMAX base station or base to user the wireless channel faces much attenuation such as fraction, reflection, refraction wall obstruction etc. These all attenuation may cause of distortion, and split toward multi path. The target of WiMAX receiver is to rebuild the transmitted data perfectly to make possible reliable data transmission.

The transmission frequencies of WiMAX technology from 2.3MHz to 3.5GHz to make it low price wireless network. WiMAX technology need different hardware infrastructure to transmit channel bandwidth. The bandwidth signal is separately in OFDMA or Orthogonal Frequency Division Multiplexed Access which is used to carry data called sub carrier. Transmitted data divided into numerous data stream where everyone is owed to another sub carrier and then transmitted at the same broadcast interval. At the downlink path the base station broadcast the data for different user professionally over uninterrupted sub-carriers.

Specialties of WiMAX
 High-speed internet surfing
 Wi-Fi enabled
 Internet sharing for multiple users
 Plug and play

WiMAX technology is a standard based wireless technology which is used to provide internet access and multimedia services at very high speed to the end user. The Wi-Fi technology is still using local area network (LAN) for the predictable future. WiMAX and Wi-Fi differences are very simple as below.
• The basic difference between WiMAX technology and Wi-Fi technology are cost, speed, distance and so on. WiMAX coverage is about 30 miles and Wi-Fi coverage is very limited to some small area.
• WiMAX network just as an ISP without any cable because WiMAX signal used to get access to internet to your home or business, while Wi-Fi will be used inside in your local area network (LAN) for access to the internet.
• The WiMAX architecture is design to make possible metropolitan area networking (MAN). The base station of WiMAX capable to provide access to business and hundreds of homes, While Wi-Fi is providing only local area networking (LAN).
• WiMAX network providing Quos (Quality of Service) therefore a large number of people get access to tower at the same time. The built in algorithm automatically transfer the user to other tower or cell of WiMAX station. Unlike Wi-Fi user have to sort of fight to stay on connected with a specified access point.

• The most significant issue of WiMAX and Wi-Fi difference is pricing because WiMAX is a high cost network, while Wi-Fi is a low cost network therefore mostly people adopt Wi-Fi network due to less expenditure and avoid WiMAX due to expensive installations.
• WiMAX offer high speed internet as a broadband access which transfer data, voice, video at very high speed. While Wi-Fi offers short range of data transfer because Wi-Fi can connect only in specified areas so only file sharing may possible.
• WiMAX network execute a connection oriented MAC while Wi-Fi runs on the CSMA/CA protocol, which is wireless and strife based.

On the whole WiMAX technology becoming popular day by day. But Wi-Fi technology has its own useful features. WiMAX technology can be predictable to be one of the most extensively used wireless internet access technology in the future.