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Abstract
Wireless communications has been emerged out as the mostly investigated and recent technical field since last several years. The increase in demand for the tremendous data rate and to support enormous number of users simultaneously that too reliably have come out with the methods of achieving huge capacity wireless systems. Earlier Wireless LAN networks currently used the IEEE802.11b standard, can facilitate data rate of 10Mbps.Today Wi-Fi standard IEEE802.11n is able to provide data rate of around 150 Mbps. The 4G (LTE-A) systems are providing the services of higher data rate and flexibility to have simultaneous voice communications, video-conferencing and other multi-media applications.