Wimax versus 3g and wifi
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From the above figure it is evident that as in the case of mobile phone towers, Wi-max also use some towers to send and receive data. WI —Max towers are installed at different convenient locations as in the case of mobile phone towers. These Wi-max towers will be connected to local area networks in home and also to the internet service provider ISP networks as shown in the above diagram.
On the other hand, Wi-Fi networks do not require such complex architecture in its technology. At present people, with broadband connection at their home or office cannot use it while they are staying few meters away from their home of office because of the inability of Wi-Fi to transfer data beyond certain limits. Such people are currently using separate internet services while they are away from their home or office broadband connection. Wi-max provides an answer to such problems. As in the case of mobile phones, Wi-Max users can make use of the services of the same ISP if they are under the coverage of Wi-Max towers.
Wi-Max is operating in a licensed environment whereas Wi-Fi is operating in an unlicensed environment. In other words, Wi-Max users need to purchase licenses whereas Wi-Fi users do not have the liability to purchase any license for their communication requirements. In other words, non-licensing requirements encourage different Wi-Fi users to communicate without any regulations whereas licensing requirements will encourage Wi-Max users to communicate only in a controlled manner.
For commercial deployment, frequency allocation is going to be a problem in the case of Wi-Max technology. In the case of Wi-Fi such inconveniences are -not there since Wi-Fi operates only in a limited area. Wireless communication technologies are on the verge of huge development at present. The introduction of Wi-Max technology may help internet users to solve many of the problems created by Wi-Fi technologies in wireless communications. Wi-Fi is capable of handling data transfer only at a smaller speed and therefore it is used mainly in home networks or Local Area Networks.
More important than peak data rate offered over an individual link is the average throughput and overall system capacity when deployed in a multicellular environment. From a capacity standpoint, the more pertinent measure of system performance is spectral efficiency.
The fact that WiMAX specifications accommodated multiple antennas right from the start gives it a boost in spectral efficiency. In 3G systems, on the other hand, multiple-antenna support is being added in the form of revisions. OFDM also makes it easier to exploit frequency diversity and multiuse diversity to improve capacity.
Therefore, when compared to 3G, WiMAX offers higher peak data rates, greater flexibility, and higher average throughput and system capacity. Another advantage of WiMAX is its ability to efficiently support more symmetric links— useful for fixed applications, such as T1 replacement—and support for flexible and dynamic adjustment of the downlinkto- uplink data rate ratios. Typically, 3G systems have a fixed asymmetric data rate ratio between downlink and uplink.
Monday, January 4, The throughput capabilities of WiMAX depend on the channel bandwidth used. Unlike 3G systems, which have a fixed channel bandwidth, WiMAX defines a selectable channel bandwidth from 1. The need for spreading makes very high data rates more difficult in CDMA systems. More important than peak data rate offered over an individual link is the average throughput and overall system capacity when deployed in a multicellular environment. From a capacity standpoint, the more pertinent measure of system performance is spectral efficiency.
The fact that WiMAX specifications accommodated multiple antennas right from the start gives it a boost in spectral efficiency. In 3G systems, on the other hand, multiple-antenna support is being added in the form of revisions. OFDM also makes it easier to exploit frequency diversity and multiuser diversity to improve capacity.
Therefore, when compared to 3G, WiMAX offers higher peak data rates, greater flexibility, and higher average throughput and system capacity. Another advantage of WiMAX is its ability to efficiently support more symmetric links— useful for fixed applications, such as T1 replacement—and support for flexible and dynamic adjustment of the downlink-to-uplink data rate ratios.