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Technological advances and the day to day growing end-user demand results in fast growing (WiFi hot spots, Bluetooth networks, ad hoc radio, etc). Can be used as unlicensed uses of wireless network technology (2.4 GHz ISM band etc). Cause a lot of overcrowding in the band this condition. Even by end users it has reached a level that can be realized. Laptop, any wireless network adapters device and or a Bluetooth enabled devices with local wireless network can be represented dozens of people trying to use the city center (WiFi, networks referred to by HotSpot names) or number can also be expressed by the dozen are faced with Bluetooth users. In this case the opposite way, the majority of licensed band or used inefficiently or not used at all.

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Incompatible with the current conditions of the existing situation and the biggest reason is tamil online fm that there is very little sharing allowing spectrum assignment policy [2]. The Federal Communications Commission (FCC) Corporation (Turkey Telecommunications Authority, etc) approximately 90% of the spectrum, according to his measurements showed that actively use [1]. Examples are the use of licensed spectrum for television as low as 14% compared to 2004 data. Based on these observations the US Federal Communications Commission bodies in space in unused licensed spectrum by licensed users instantly by a legal regulation to harm the functioning of licensed users of unlicensed users with the condition legally is the ability for use of licensed spectrum in question. In light of these developments, cognitive radio (BR) (cognitive tamil online fm radio) [3] technology began to develop as a solution to spectrum for wireless networks from the famine situation.

By adapting the operating characteristics of the cognitive radio technology, radio environment according to the instantaneous real-time conditions, flexible, it has become a key technology for the efficient and reliable use of spectrum. Cognitive radio spectrum technology is used in large quantities without any damage to the licensed user it has the potential for use effectively. Defined basically three different approaches in the use of cognitive radio technology have been proposed. These nested (interweave), the (under layer) overlay (overlay) approach [4, 5] may be called. In approach is creating interference to licensed users at a level that will not damage the cognitive radio transmission process.

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In approach, taking information from licensed users in the presence of cognitive radio and access to the licensed user's messages are simultaneously the spectrum. Finally, while the cognitive approach within tamil online fm other radio users, licensed spectrum users to licensed users and only where there is no spectrum with an opportunistic approach and benefit from accessing moments of the use of spectrum. This approach models, cognitive radio users of spectrum tamil online fm is required spectrum unloading in a way that allows a licensed user noticing it instant access to the spectrum without any loss of performance instant control and access to spectrum spaces they catch, and reaches a licensed user spectrum. In the literature, the general method has been adopted as use here such an approach and tried to develop technology for this approach. In model studies, this approach is radio movie tamil based.

In the system, with a realistic approach, both licensed users and it is thought they are trying to communicate to the same environment and at the same time cognitive radio users. Licensed users to have a fixed radio movie tamil transmission power and in particular, is considered to be a fixed transmission range. The cognitive radio users feed here listening to media, realizing that it is a licensed user environment, users of licensed spectrum tamil online fm remaining gaps are trying to perform communication using effectively. Therefore, cognitive radio users, in order to achieve an effective communication without disturbing licensed users, they need to various methods.