Potential Sharing in TV Band using Cognitive Wireless Networks

Abstract

Cognitive wireless networks (CWNs) are advanced wireless systems where network nodes are equipped via smart engines, enabling them to exhibit intelligent behavior across the entire network. This advancement holds promise for improving commercial data services and facilitating the establishment of new emergency and surveillance and military communication services. An illustration of this is the exploration of sharing between licensed TV bands (primary user) and unlicensed WiMax (secondary user). Despite the allocation of a significant portion of the radio frequency spectrum to TV bands, much of it remains unused. This underutilization makes TV spectrum an attractive candidate for dynamic spectrum access (DSA). However, further investigation is necessary to ascertain the suitability of this spectrum for supporting secondary transmissions. Dynamic Frequency Selection (DFS) empowers radios to select bands by minimal interference, while Power Control (PC) facilitates communication at the lowest feasible power transmit. Time Agility (TA) allows radios to adjust according to the traffic patterns of one another, This helps reduce disruption in challenging channel situations. These techniques were evaluated through simulations conducted using the network simulator NS2. The proposed network is TV Based station as primary user and many WiMax connected together as mesh network. The result proves that WiMax transmitting data within TV Channels when TV channels not transmitting and WiMax within same geographical coverage of TV Base Station.